Merge branch 'dev' of https://github.com/h4h13/RetroMusicPlayer into google-san

app/src/main/AndroidManifest.xml

@@ -106,7 +106,7 @@
             </intent-filter>
         </activity>
         <activity android:name=".activities.albums.AlbumDetailsActivity" />
-        <activity android:name=".activities.ArtistDetailActivity" />
+        <activity android:name=".activities.artists.ArtistDetailActivity" />
         <activity android:name=".activities.PlaylistDetailActivity" />
         <activity android:name=".activities.PlayingQueueActivity" />
         <activity android:name=".activities.AboutActivity" />

app/src/main/java/code/name/monkey/retromusic/Constants.kt

@@ -32,7 +32,7 @@ object Constants {
     const val FAQ_LINK = "https://github.com/h4h13/RetroMusicPlayer/blob/master/FAQ.md"
     const val PINTEREST = "https://in.pinterest.com/retromusicapp/"
 
-    const val BASE_SELECTION =
+    const val IS_MUSIC =
         MediaStore.Audio.AudioColumns.IS_MUSIC + "=1" + " AND " + MediaStore.Audio.AudioColumns.TITLE + " != ''"
 
     val baseProjection = arrayOf(
@@ -47,11 +47,9 @@ object Constants {
         MediaStore.Audio.AudioColumns.ALBUM, // 8
         MediaStore.Audio.AudioColumns.ARTIST_ID, // 9
         MediaStore.Audio.AudioColumns.ARTIST,// 10
-        MediaStore.Audio.AudioColumns.COMPOSER
+        MediaStore.Audio.AudioColumns.COMPOSER// 11
-    )// 11
+    )
     const val NUMBER_OF_TOP_TRACKS = 99
-
-
 }
 
 const val EXTRA_SONG = "extra_songs"
@@ -113,8 +111,7 @@ const val COLORED_APP_SHORTCUTS = "colored_app_shortcuts"
 const val AUDIO_DUCKING = "audio_ducking"
 const val LAST_ADDED_CUTOFF = "last_added_interval"
 const val LAST_SLEEP_TIMER_VALUE = "last_sleep_timer_value"
-const val NEXT_SLEEP_TIMER_ELAPSED_REALTIME =
+const val NEXT_SLEEP_TIMER_ELAPSED_REALTIME = "next_sleep_timer_elapsed_real_time"
-    "next_sleep_timer_elapsed_real_time"
 const val IGNORE_MEDIA_STORE_ARTWORK = "ignore_media_store_artwork"
 const val LAST_CHANGELOG_VERSION = "last_changelog_version"
 const val AUTO_DOWNLOAD_IMAGES_POLICY = "auto_download_images_policy"

app/src/main/java/code/name/monkey/retromusic/LanguageContextWrapper.java

@@ -1,6 +1,7 @@
 package code.name.monkey.retromusic;
 
 import android.content.Context;
+import android.content.ContextWrapper;
 import android.content.res.Configuration;
 import android.content.res.Resources;
 import android.os.LocaleList;
@@ -9,7 +10,7 @@ import java.util.Locale;
 
 import code.name.monkey.appthemehelper.util.VersionUtils;
 
-public class LanguageContextWrapper extends android.content.ContextWrapper {
+public class LanguageContextWrapper extends ContextWrapper {
 
     public LanguageContextWrapper(Context base) {
         super(base);

app/src/main/java/code/name/monkey/retromusic/RetroBottomSheetBehavior.java

@@ -9,10 +9,12 @@ import androidx.coordinatorlayout.widget.CoordinatorLayout;
 
 import com.google.android.material.bottomsheet.BottomSheetBehavior;
 
+import org.jetbrains.annotations.NotNull;
+
 
 public class RetroBottomSheetBehavior<V extends View> extends BottomSheetBehavior<V> {
 
-    private static final String TAG = "CustomBottomSheetBehavi";
+    private static final String TAG = "RetroBottomSheetBehavior";
 
     private boolean allowDragging = true;
 
@@ -28,7 +30,7 @@ public class RetroBottomSheetBehavior<V extends View> extends BottomSheetBehavio
     }
 
     @Override
-    public boolean onInterceptTouchEvent(CoordinatorLayout parent, V child, MotionEvent event) {
+    public boolean onInterceptTouchEvent(@NotNull CoordinatorLayout parent, @NotNull V child, @NotNull MotionEvent event) {
         if (!allowDragging) {
             return false;
         }

app/src/main/java/code/name/monkey/retromusic/activities/LyricsActivity.kt

@@ -34,7 +34,7 @@ import code.name.monkey.retromusic.model.Song
 import code.name.monkey.retromusic.model.lyrics.Lyrics
 import code.name.monkey.retromusic.util.LyricUtil
 import code.name.monkey.retromusic.util.MusicUtil
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import kotlinx.android.synthetic.main.activity_lyrics.*
 import kotlinx.android.synthetic.main.fragment_lyrics.*
 import kotlinx.android.synthetic.main.fragment_synced.*
@@ -54,7 +54,7 @@ class LyricsActivity : AbsMusicServiceActivity(), View.OnClickListener,
     }
 
     override fun onPageSelected(position: Int) {
-        PreferenceUtilKT.lyricsOption = position
+        PreferenceUtil.lyricsOption = position
         if (position == 0) fab.text = getString(R.string.synced_lyrics)
         else if (position == 1) fab.text = getString(R.string.lyrics)
     }
@@ -100,7 +100,7 @@ class LyricsActivity : AbsMusicServiceActivity(), View.OnClickListener,
 
         viewPager.apply {
             adapter = PagerAdapter(supportFragmentManager)
-            currentItem = PreferenceUtilKT.lyricsOption
+            currentItem = PreferenceUtil.lyricsOption
             addOnPageChangeListener(this@LyricsActivity)
         }
 

app/src/main/java/code/name/monkey/retromusic/activities/MainActivity.kt

@@ -47,7 +47,7 @@ import code.name.monkey.retromusic.model.Song
 import code.name.monkey.retromusic.service.MusicService
 import code.name.monkey.retromusic.util.AppRater.appLaunched
 import code.name.monkey.retromusic.util.NavigationUtil
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.RetroColorUtil
 import code.name.monkey.retromusic.util.RetroUtil
 import com.afollestad.materialcab.MaterialCab
@@ -99,7 +99,7 @@ class MainActivity : AbsSlidingMusicPanelActivity(),
         override fun onReceive(context: Context, intent: Intent) {
             val action = intent.action
             if (action != null && action == Intent.ACTION_SCREEN_OFF) {
-                if (PreferenceUtilKT.isLockScreen && isPlaying) {
+                if (PreferenceUtil.isLockScreen && isPlaying) {
                     val activity = Intent(context, LockScreenActivity::class.java)
                     activity.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
                     activity.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY)
@@ -127,7 +127,7 @@ class MainActivity : AbsSlidingMusicPanelActivity(),
         addMusicServiceEventListener(libraryViewModel)
 
         if (savedInstanceState == null) {
-            selectedFragment(PreferenceUtilKT.lastPage)
+            selectedFragment(PreferenceUtil.lastPage)
         } else {
             restoreCurrentFragment()
         }
@@ -136,9 +136,9 @@ class MainActivity : AbsSlidingMusicPanelActivity(),
         setupToolbar()
         checkUpdate()
         updateTabs()
-        getBottomNavigationView().selectedItemId = PreferenceUtilKT.lastPage
+        getBottomNavigationView().selectedItemId = PreferenceUtil.lastPage
         getBottomNavigationView().setOnNavigationItemSelectedListener {
-            PreferenceUtilKT.lastPage = it.itemId
+            PreferenceUtil.lastPage = it.itemId
             selectedFragment(it.itemId)
             true
         }
@@ -147,10 +147,10 @@ class MainActivity : AbsSlidingMusicPanelActivity(),
     override fun onResume() {
         super.onResume()
         registerReceiver(broadcastReceiver, intentFilter)
-        PreferenceUtilKT.registerOnSharedPreferenceChangedListener(this)
+        PreferenceUtil.registerOnSharedPreferenceChangedListener(this)
         if (intent.hasExtra(EXPAND_PANEL) &&
             intent.getBooleanExtra(EXPAND_PANEL, false) &&
-            PreferenceUtilKT.isExpandPanel
+            PreferenceUtil.isExpandPanel
         ) {
             expandPanel()
             intent.removeExtra(EXPAND_PANEL)
@@ -179,7 +179,7 @@ class MainActivity : AbsSlidingMusicPanelActivity(),
     override fun onDestroy() {
         super.onDestroy()
         unregisterReceiver(broadcastReceiver)
-        PreferenceUtilKT.unregisterOnSharedPreferenceChangedListener(this)
+        PreferenceUtil.unregisterOnSharedPreferenceChangedListener(this)
     }
 
     override fun onPrepareOptionsMenu(menu: Menu?): Boolean {

app/src/main/java/code/name/monkey/retromusic/activities/UserInfoActivity.kt

@@ -21,7 +21,7 @@ import code.name.monkey.retromusic.extensions.applyToolbar
 import code.name.monkey.retromusic.glide.ProfileBannerGlideRequest
 import code.name.monkey.retromusic.glide.UserProfileGlideRequest
 import code.name.monkey.retromusic.util.ImageUtil
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import com.bumptech.glide.Glide
 import com.bumptech.glide.load.engine.DiskCacheStrategy
 import com.bumptech.glide.request.RequestListener
@@ -50,7 +50,7 @@ class UserInfoActivity : AbsBaseActivity() {
         applyToolbar(toolbar)
 
         MaterialUtil.setTint(nameContainer, false)
-        name.setText(PreferenceUtilKT.userName)
+        name.setText(PreferenceUtil.userName)
 
         userImage.setOnClickListener {
             pickNewPhoto()
@@ -66,7 +66,7 @@ class UserInfoActivity : AbsBaseActivity() {
                 Toast.makeText(this, "Umm name is empty", Toast.LENGTH_SHORT).show()
                 return@setOnClickListener
             }
-            PreferenceUtilKT.userName = nameString
+            PreferenceUtil.userName = nameString
             setResult(Activity.RESULT_OK)
             finish()
         }

app/src/main/java/code/name/monkey/retromusic/activities/WhatsNewActivity.java

@@ -25,7 +25,7 @@ import code.name.monkey.appthemehelper.util.MaterialValueHelper;
 import code.name.monkey.appthemehelper.util.ToolbarContentTintHelper;
 import code.name.monkey.retromusic.R;
 import code.name.monkey.retromusic.activities.base.AbsBaseActivity;
-import code.name.monkey.retromusic.util.PreferenceUtilKT;
+import code.name.monkey.retromusic.util.PreferenceUtil;
 
 public class WhatsNewActivity extends AbsBaseActivity {
 
@@ -38,7 +38,7 @@ public class WhatsNewActivity extends AbsBaseActivity {
         try {
             PackageInfo pInfo = context.getPackageManager().getPackageInfo(context.getPackageName(), 0);
             int currentVersion = pInfo.versionCode;
-            PreferenceUtilKT.INSTANCE.setLastVersion(currentVersion);
+            PreferenceUtil.INSTANCE.setLastVersion(currentVersion);
         } catch (PackageManager.NameNotFoundException e) {
             e.printStackTrace();
         }

app/src/main/java/code/name/monkey/retromusic/activities/albums/AlbumDetailsActivity.kt

@@ -74,7 +74,7 @@ class AlbumDetailsActivity : AbsSlidingMusicPanelActivity(), AlbumDetailsView, C
     private lateinit var artistImage: ImageView
     private var cab: MaterialCab? = null
     private val savedSortOrder: String
-        get() = PreferenceUtilKT.albumDetailSongSortOrder
+        get() = PreferenceUtil.albumDetailSongSortOrder
 
     override fun createContentView(): View {
         return wrapSlidingMusicPanel(R.layout.activity_album)
@@ -189,8 +189,8 @@ class AlbumDetailsActivity : AbsSlidingMusicPanelActivity(), AlbumDetailsView, C
         }
         loadAlbumCover()
         simpleSongAdapter.swapDataSet(album.songs)
-        viewModel.loadArtistAsync(album.artistId)
+        viewModel.loadArtist(album.artistId)
-        viewModel.loadAlbumInfoAsync(album)
+        viewModel.loadAlbumInfo(album)
     }
 
     override fun moreAlbums(albums: List<Album>) {
@@ -244,7 +244,7 @@ class AlbumDetailsActivity : AbsSlidingMusicPanelActivity(), AlbumDetailsView, C
     private fun loadAlbumCover() {
         AlbumGlideRequest.Builder.from(Glide.with(this), album.safeGetFirstSong())
             .checkIgnoreMediaStore(this)
-            .ignoreMediaStore(PreferenceUtilKT.isIgnoreMediaStoreArtwork)
+            .ignoreMediaStore(PreferenceUtil.isIgnoreMediaStoreArtwork)
             .generatePalette(this)
             .build()
             .dontAnimate()
@@ -257,7 +257,7 @@ class AlbumDetailsActivity : AbsSlidingMusicPanelActivity(), AlbumDetailsView, C
     }
 
     private fun setColors(color: MediaNotificationProcessor) {
-        val buttonColor = if (PreferenceUtilKT.isAdaptiveColor)
+        val buttonColor = if (PreferenceUtil.isAdaptiveColor)
             color.backgroundColor.ripAlpha()
         else
             ATHUtil.resolveColor(this, R.attr.colorSurface)
@@ -353,7 +353,7 @@ class AlbumDetailsActivity : AbsSlidingMusicPanelActivity(), AlbumDetailsView, C
     }
 
     private fun setSaveSortOrder(sortOrder: String) {
-        PreferenceUtilKT.albumDetailSongSortOrder = sortOrder
+        PreferenceUtil.albumDetailSongSortOrder = sortOrder
         when (sortOrder) {
             AlbumSongSortOrder.SONG_TRACK_LIST -> album.songs?.sortWith(Comparator { o1, o2 ->
                 o1.trackNumber.compareTo(

app/src/main/java/code/name/monkey/retromusic/activities/albums/AlbumDetailsViewModel.kt

@@ -32,17 +32,16 @@ class AlbumDetailsViewModel(
     }
 
     private fun loadDetails() = viewModelScope.launch {
-        _album.postValue(
+        val album = loadAlbumAsync.await() ?: throw NullPointerException("Album couldn't found")
-            loadAlbumAsync.await() ?: throw NullPointerException("Album couldn't found")
+        _album.postValue(album)
-        )
     }
 
-    fun loadAlbumInfoAsync(album: Album) = viewModelScope.launch(Dispatchers.IO) {
+    fun loadAlbumInfo(album: Album) = viewModelScope.launch(Dispatchers.IO) {
         val lastFmAlbum = _repository.albumInfo(album.artistName ?: "-", album.title ?: "-")
         _lastFmAlbum.postValue(lastFmAlbum)
     }
 
-    fun loadArtistAsync(artistId: Int) = viewModelScope.launch(Dispatchers.IO) {
+    fun loadArtist(artistId: Int) = viewModelScope.launch(Dispatchers.IO) {
         val artist = _repository.artistById(artistId)
         _artist.postValue(artist)
     }

app/src/main/java/code/name/monkey/retromusic/activities/artists/ArtistDetailActivity.kt

@@ -1,4 +1,4 @@
-package code.name.monkey.retromusic.activities
+package code.name.monkey.retromusic.activities.artists
 
 import android.app.Activity
 import android.content.Intent
@@ -11,12 +11,12 @@ import android.view.View
 import android.widget.Toast
 import androidx.core.app.ActivityCompat
 import androidx.core.text.HtmlCompat
+import androidx.lifecycle.ViewModelProvider
 import androidx.recyclerview.widget.DefaultItemAnimator
 import androidx.recyclerview.widget.GridLayoutManager
 import androidx.recyclerview.widget.LinearLayoutManager
 import code.name.monkey.appthemehelper.util.ATHUtil
 import code.name.monkey.appthemehelper.util.MaterialUtil
-import code.name.monkey.retromusic.App
 import code.name.monkey.retromusic.R
 import code.name.monkey.retromusic.activities.base.AbsSlidingMusicPanelActivity
 import code.name.monkey.retromusic.adapter.album.HorizontalAlbumAdapter
@@ -31,7 +31,6 @@ import code.name.monkey.retromusic.glide.RetroMusicColoredTarget
 import code.name.monkey.retromusic.helper.MusicPlayerRemote
 import code.name.monkey.retromusic.interfaces.CabHolder
 import code.name.monkey.retromusic.model.Artist
-import code.name.monkey.retromusic.mvp.presenter.ArtistDetailsPresenter
 import code.name.monkey.retromusic.mvp.presenter.ArtistDetailsView
 import code.name.monkey.retromusic.rest.model.LastFmArtist
 import code.name.monkey.retromusic.util.*
@@ -41,7 +40,6 @@ import com.bumptech.glide.Glide
 import kotlinx.android.synthetic.main.activity_artist_content.*
 import kotlinx.android.synthetic.main.activity_artist_details.*
 import java.util.*
-import javax.inject.Inject
 import kotlin.collections.ArrayList
 
 class ArtistDetailActivity : AbsSlidingMusicPanelActivity(), ArtistDetailsView, CabHolder {
@@ -70,14 +68,12 @@ class ArtistDetailActivity : AbsSlidingMusicPanelActivity(), ArtistDetailsView,
     private lateinit var songAdapter: SimpleSongAdapter
     private lateinit var albumAdapter: HorizontalAlbumAdapter
     private var forceDownload: Boolean = false
+    private lateinit var viewModel: ArtistDetailsViewModel
 
     override fun createContentView(): View {
         return wrapSlidingMusicPanel(R.layout.activity_artist_details)
     }
 
-    @Inject
-    lateinit var artistDetailsPresenter: ArtistDetailsPresenter
-
     private fun windowEnterTransition() {
         val slide = Slide()
         slide.excludeTarget(R.id.appBarLayout, true)
@@ -98,11 +94,17 @@ class ArtistDetailActivity : AbsSlidingMusicPanelActivity(), ArtistDetailsView,
         window.sharedElementsUseOverlay = true
         windowEnterTransition()
 
-        App.musicComponent.inject(this)
-        artistDetailsPresenter.attachView(this)
         val artistId = extraNotNull<Int>(EXTRA_ARTIST_ID).value
-        artistDetailsPresenter.loadArtist(artistId)
+        val viewModelFactory = ArtistDetailsViewModelFactory(application, artistId)
-
+        viewModel =
+            ViewModelProvider(this, viewModelFactory).get(ArtistDetailsViewModel::class.java)
+        viewModel.getArtist().observe(this, androidx.lifecycle.Observer {
+            ActivityCompat.startPostponedEnterTransition(this@ArtistDetailActivity)
+            artist(it)
+        })
+        viewModel.getArtistInfo().observe(this, androidx.lifecycle.Observer {
+            artistInfo(it)
+        })
         ActivityCompat.postponeEnterTransition(this)
 
         setupRecyclerView()
@@ -123,11 +125,6 @@ class ArtistDetailActivity : AbsSlidingMusicPanelActivity(), ArtistDetailsView,
         }
     }
 
-    override fun onDestroy() {
-        super.onDestroy()
-        artistDetailsPresenter.detachView()
-    }
-
     private fun setupRecyclerView() {
         albumAdapter = HorizontalAlbumAdapter(this, ArrayList(), null)
         albumRecyclerView.apply {
@@ -152,7 +149,7 @@ class ArtistDetailActivity : AbsSlidingMusicPanelActivity(), ArtistDetailsView,
                 }
             }
             else -> if (resultCode == Activity.RESULT_OK) {
-                reload()
+                //reload()
             }
         }
     }
@@ -205,7 +202,7 @@ class ArtistDetailActivity : AbsSlidingMusicPanelActivity(), ArtistDetailsView,
     ) {
         biography = null
         this.lang = lang
-        artistDetailsPresenter.loadBiography(name, lang, null)
+        viewModel.loadBiography(name, lang, null)
     }
 
     override fun artistInfo(lastFmArtist: LastFmArtist?) {
@@ -248,7 +245,7 @@ class ArtistDetailActivity : AbsSlidingMusicPanelActivity(), ArtistDetailsView,
     }
 
     private fun setColors(color: MediaNotificationProcessor) {
-        val buttonColor = if (PreferenceUtilKT.isAdaptiveColor)
+        val buttonColor = if (PreferenceUtil.isAdaptiveColor)
             color.backgroundColor.ripAlpha()
         else
             ATHUtil.resolveColor(this, R.attr.colorSurface)
@@ -315,19 +312,6 @@ class ArtistDetailActivity : AbsSlidingMusicPanelActivity(), ArtistDetailsView,
         return super.onCreateOptionsMenu(menu)
     }
 
-    override fun onMediaStoreChanged() {
-        super.onMediaStoreChanged()
-        reload()
-    }
-
-    private fun reload() {
-        if (intent.extras!!.containsKey(EXTRA_ARTIST_ID)) {
-            intent.extras?.getInt(EXTRA_ARTIST_ID)?.let { artistDetailsPresenter.loadArtist(it) }
-        } else {
-            finish()
-        }
-    }
-
     override fun onBackPressed() {
         if (cab != null && cab!!.isActive) {
             cab?.finish()
@@ -337,7 +321,6 @@ class ArtistDetailActivity : AbsSlidingMusicPanelActivity(), ArtistDetailsView,
     }
 
     companion object {
-
         const val EXTRA_ARTIST_ID = "extra_artist_id"
         const val REQUEST_CODE_SELECT_IMAGE = 9003
     }

app/src/main/java/code/name/monkey/retromusic/activities/artists/ArtistDetailsViewModel.kt

@@ -0,0 +1,46 @@
+package code.name.monkey.retromusic.activities.artists
+
+import android.app.Application
+import androidx.lifecycle.AndroidViewModel
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.viewModelScope
+import code.name.monkey.retromusic.model.Artist
+import code.name.monkey.retromusic.providers.RepositoryImpl
+import code.name.monkey.retromusic.rest.model.LastFmArtist
+import kotlinx.coroutines.Deferred
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.async
+import kotlinx.coroutines.launch
+
+class ArtistDetailsViewModel(
+    application: Application,
+    private val artistId: Int
+) : AndroidViewModel(application) {
+
+    private val loadArtistDetailsAsync: Deferred<Artist?>
+        get() = viewModelScope.async(Dispatchers.IO) {
+            _repository.artistById(artistId)
+        }
+    private val _repository = RepositoryImpl(application.applicationContext)
+    private val _artist = MutableLiveData<Artist>()
+    private val _lastFmArtist = MutableLiveData<LastFmArtist>()
+
+    fun getArtist(): LiveData<Artist> = _artist
+    fun getArtistInfo(): LiveData<LastFmArtist> = _lastFmArtist
+
+    init {
+        loadArtistDetails()
+    }
+
+    private fun loadArtistDetails() = viewModelScope.launch {
+        val artist =
+            loadArtistDetailsAsync.await() ?: throw NullPointerException("Album couldn't found")
+        _artist.postValue(artist)
+    }
+
+    fun loadBiography(name: String, lang: String?, cache: String?) = viewModelScope.launch {
+        val info = _repository.artistInfo(name, lang, cache)
+        _lastFmArtist.postValue(info)
+    }
+}

app/src/main/java/code/name/monkey/retromusic/activities/artists/ArtistDetailsViewModelFactory.kt

@@ -0,0 +1,19 @@
+package code.name.monkey.retromusic.activities.artists
+
+import android.app.Application
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+
+class ArtistDetailsViewModelFactory(
+    private val application: Application,
+    private val artistId: Int
+) :
+    ViewModelProvider.AndroidViewModelFactory(application) {
+    override fun <T : ViewModel?> create(modelClass: Class<T>): T {
+        return if (modelClass.isAssignableFrom(ArtistDetailsViewModel::class.java)) {
+            ArtistDetailsViewModel(application, artistId) as T
+        } else {
+            throw IllegalArgumentException("ViewModel Not Found")
+        }
+    }
+}

app/src/main/java/code/name/monkey/retromusic/activities/base/AbsSlidingMusicPanelActivity.kt

@@ -39,7 +39,7 @@ import code.name.monkey.retromusic.fragments.player.tiny.TinyPlayerFragment
 import code.name.monkey.retromusic.helper.MusicPlayerRemote
 import code.name.monkey.retromusic.model.CategoryInfo
 import code.name.monkey.retromusic.util.DensityUtil
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.views.BottomNavigationBarTinted
 import com.google.android.material.bottomsheet.BottomSheetBehavior
 import com.google.android.material.shape.MaterialShapeDrawable
@@ -117,7 +117,7 @@ abstract class AbsSlidingMusicPanelActivity : AbsMusicServiceActivity(),
 
     override fun onResume() {
         super.onResume()
-        if (cps != PreferenceUtilKT.nowPlayingScreen) {
+        if (cps != PreferenceUtil.nowPlayingScreen) {
             postRecreate()
         }
         behavior.addBottomSheetCallback(bottomSheetCallbackList)
@@ -239,7 +239,7 @@ abstract class AbsSlidingMusicPanelActivity : AbsMusicServiceActivity(),
     }
 
     private fun chooseFragmentForTheme() {
-        cps = PreferenceUtilKT.nowPlayingScreen
+        cps = PreferenceUtil.nowPlayingScreen
         val fragment: Fragment = when (cps) {
             Blur -> BlurPlayerFragment()
             Adaptive -> AdaptiveFragment()
@@ -310,7 +310,7 @@ abstract class AbsSlidingMusicPanelActivity : AbsMusicServiceActivity(),
 
             val isColorLight = ColorUtil.isColorLight(paletteColor)
 
-            if (PreferenceUtilKT.isAdaptiveColor && (cps == Normal || cps == Flat)) {
+            if (PreferenceUtil.isAdaptiveColor && (cps == Normal || cps == Flat)) {
                 super.setLightNavigationBar(true)
                 super.setLightStatusbar(isColorLight)
             } else if (cps == Card || cps == Blur || cps == BlurCard) {
@@ -374,7 +374,7 @@ abstract class AbsSlidingMusicPanelActivity : AbsMusicServiceActivity(),
 
     fun updateTabs() {
         bottomNavigationView.menu.clear()
-        val currentTabs: List<CategoryInfo> = PreferenceUtilKT.libraryCategory
+        val currentTabs: List<CategoryInfo> = PreferenceUtil.libraryCategory
         for (tab in currentTabs) {
             if (tab.visible) {
                 val menu = tab.category

app/src/main/java/code/name/monkey/retromusic/activities/base/AbsThemeActivity.kt

@@ -18,7 +18,7 @@ import code.name.monkey.appthemehelper.util.MaterialDialogsUtil
 import code.name.monkey.appthemehelper.util.VersionUtils
 import code.name.monkey.retromusic.LanguageContextWrapper
 import code.name.monkey.retromusic.R
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.RetroUtil
 import code.name.monkey.retromusic.util.theme.ThemeManager
 import java.util.*
@@ -44,7 +44,7 @@ abstract class AbsThemeActivity : ATHToolbarActivity(), Runnable {
     }
 
     private fun toggleScreenOn() {
-        if (PreferenceUtilKT.isScreenOnEnabled) {
+        if (PreferenceUtil.isScreenOnEnabled) {
             window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
         } else {
             window.clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
@@ -63,7 +63,7 @@ abstract class AbsThemeActivity : ATHToolbarActivity(), Runnable {
     }
 
     fun hideStatusBar() {
-        hideStatusBar(PreferenceUtilKT.isFullScreenMode)
+        hideStatusBar(PreferenceUtil.isFullScreenMode)
     }
 
     private fun hideStatusBar(fullscreen: Boolean) {
@@ -166,7 +166,7 @@ abstract class AbsThemeActivity : ATHToolbarActivity(), Runnable {
         val flags =
             (View.SYSTEM_UI_FLAG_LAYOUT_STABLE or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION or View.SYSTEM_UI_FLAG_FULLSCREEN or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY)
 
-        if (PreferenceUtilKT.isFullScreenMode) {
+        if (PreferenceUtil.isFullScreenMode) {
             window.decorView.systemUiVisibility = flags
         }
     }
@@ -199,7 +199,7 @@ abstract class AbsThemeActivity : ATHToolbarActivity(), Runnable {
     }
 
     override fun attachBaseContext(newBase: Context?) {
-        val code = PreferenceUtilKT.languageCode
+        val code = PreferenceUtil.languageCode
         if (code != "auto") {
             super.attachBaseContext(LanguageContextWrapper.wrap(newBase, Locale(code)))
         } else super.attachBaseContext(newBase)

app/src/main/java/code/name/monkey/retromusic/activities/bugreport/model/DeviceInfo.java

@@ -11,7 +11,7 @@ import androidx.annotation.IntRange;
 import java.util.Arrays;
 import java.util.Locale;
 
-import code.name.monkey.retromusic.util.PreferenceUtilKT;
+import code.name.monkey.retromusic.util.PreferenceUtil;
 
 public class DeviceInfo {
 
@@ -75,10 +75,10 @@ public class DeviceInfo {
             versionCode = -1;
             versionName = null;
         }
-        baseTheme = PreferenceUtilKT.INSTANCE.getBaseTheme();
+        baseTheme = PreferenceUtil.INSTANCE.getBaseTheme();
-        nowPlayingTheme = context.getString(PreferenceUtilKT.INSTANCE.getNowPlayingScreen().getTitleRes());
+        nowPlayingTheme = context.getString(PreferenceUtil.INSTANCE.getNowPlayingScreen().getTitleRes());
-        isAdaptive = PreferenceUtilKT.INSTANCE.isAdaptiveColor();
+        isAdaptive = PreferenceUtil.INSTANCE.isAdaptiveColor();
-        selectedLang = PreferenceUtilKT.INSTANCE.getLanguageCode();
+        selectedLang = PreferenceUtil.INSTANCE.getLanguageCode();
     }
 
     public String toMarkdown() {

app/src/main/java/code/name/monkey/retromusic/adapter/HomeAdapter.kt

@@ -21,7 +21,7 @@ import code.name.monkey.retromusic.model.Artist
 import code.name.monkey.retromusic.model.Home
 import code.name.monkey.retromusic.model.Playlist
 
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 
 class HomeAdapter(
     private val activity: AppCompatActivity,
@@ -118,7 +118,7 @@ class HomeAdapter(
                 val artistAdapter = ArtistAdapter(
                     activity,
                     list,
-                    PreferenceUtilKT.homeGridStyle,
+                    PreferenceUtil.homeGridStyle,
                     null
                 )
                 recyclerView.apply {

app/src/main/java/code/name/monkey/retromusic/adapter/album/AlbumAdapter.kt

@@ -22,7 +22,7 @@ import code.name.monkey.retromusic.model.Album
 import code.name.monkey.retromusic.model.Song
 import code.name.monkey.retromusic.util.MusicUtil
 import code.name.monkey.retromusic.util.NavigationUtil
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import com.bumptech.glide.Glide
 import me.zhanghai.android.fastscroll.PopupTextProvider
@@ -153,7 +153,7 @@ open class AlbumAdapter(
 
     private fun getSectionName(position: Int): String {
         var sectionName: String? = null
-        when (PreferenceUtilKT.albumSortOrder) {
+        when (PreferenceUtil.albumSortOrder) {
             SortOrder.AlbumSortOrder.ALBUM_A_Z, SortOrder.AlbumSortOrder.ALBUM_Z_A -> sectionName =
                 dataSet[position].title
             SortOrder.AlbumSortOrder.ALBUM_ARTIST -> sectionName = dataSet[position].artistName

app/src/main/java/code/name/monkey/retromusic/adapter/album/AlbumCoverPagerAdapter.kt

@@ -16,7 +16,7 @@ import code.name.monkey.retromusic.misc.CustomFragmentStatePagerAdapter
 import code.name.monkey.retromusic.model.Song
 import code.name.monkey.retromusic.util.NavigationUtil
 
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import com.bumptech.glide.Glide
 
@@ -91,7 +91,7 @@ class AlbumCoverPagerAdapter(
         }
 
         private fun getLayoutWithPlayerTheme(): Int {
-            return when (PreferenceUtilKT.nowPlayingScreen) {
+            return when (PreferenceUtil.nowPlayingScreen) {
                 Card,
                 Fit,
                 Tiny,
@@ -100,17 +100,17 @@ class AlbumCoverPagerAdapter(
                 Gradient,
                 Full -> R.layout.fragment_album_full_cover
                 else -> {
-                    if (PreferenceUtilKT.isCarouselEffect) {
+                    if (PreferenceUtil.isCarouselEffect) {
                         R.layout.fragment_album_carousel_cover
                     } else {
-                        when (PreferenceUtilKT.albumCoverStyle) {
+                        when (PreferenceUtil.albumCoverStyle) {
-                            AlbumCoverStyle.NORMAL -> R.layout.fragment_album_cover
+                            AlbumCoverStyle.Normal -> R.layout.fragment_album_cover
-                            AlbumCoverStyle.FLAT -> R.layout.fragment_album_flat_cover
+                            AlbumCoverStyle.Flat -> R.layout.fragment_album_flat_cover
-                            AlbumCoverStyle.CIRCLE -> R.layout.fragment_album_circle_cover
+                            AlbumCoverStyle.Circle -> R.layout.fragment_album_circle_cover
-                            AlbumCoverStyle.CARD -> R.layout.fragment_album_card_cover
+                            AlbumCoverStyle.Card -> R.layout.fragment_album_card_cover
-                            AlbumCoverStyle.MATERIAL -> R.layout.fragment_album_material_cover
+                            AlbumCoverStyle.Material -> R.layout.fragment_album_material_cover
-                            AlbumCoverStyle.FULL -> R.layout.fragment_album_full_cover
+                            AlbumCoverStyle.Full -> R.layout.fragment_album_full_cover
-                            AlbumCoverStyle.FULL_CARD -> R.layout.fragment_album_full_card_cover
+                            AlbumCoverStyle.FullCard -> R.layout.fragment_album_full_card_cover
                         }
                     }
                 }

app/src/main/java/code/name/monkey/retromusic/adapter/song/SongAdapter.kt

@@ -24,7 +24,7 @@ import code.name.monkey.retromusic.interfaces.CabHolder
 import code.name.monkey.retromusic.model.Song
 import code.name.monkey.retromusic.util.MusicUtil
 import code.name.monkey.retromusic.util.NavigationUtil
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import com.afollestad.materialcab.MaterialCab
@@ -145,7 +145,7 @@ open class SongAdapter(
     }
 
     override fun getPopupText(position: Int): String {
-        val sectionName: String? = when (PreferenceUtilKT.songSortOrder) {
+        val sectionName: String? = when (PreferenceUtil.songSortOrder) {
             SortOrder.SongSortOrder.SONG_A_Z, SortOrder.SongSortOrder.SONG_Z_A -> dataSet[position].title
             SortOrder.SongSortOrder.SONG_ALBUM -> dataSet[position].albumName
             SortOrder.SongSortOrder.SONG_ARTIST -> dataSet[position].artistName

app/src/main/java/code/name/monkey/retromusic/appshortcuts/AppShortcutIconGenerator.kt

@@ -25,13 +25,13 @@ import android.util.TypedValue
 import androidx.annotation.RequiresApi
 import code.name.monkey.appthemehelper.ThemeStore
 import code.name.monkey.retromusic.R
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.RetroUtil
 
 @RequiresApi(Build.VERSION_CODES.N_MR1)
 object AppShortcutIconGenerator {
     fun generateThemedIcon(context: Context, iconId: Int): Icon {
-        return if (PreferenceUtilKT.isColoredAppShortcuts) {
+        return if (PreferenceUtil.isColoredAppShortcuts) {
             generateUserThemedIcon(context, iconId)
         } else {
             generateDefaultThemedIcon(context, iconId)

app/src/main/java/code/name/monkey/retromusic/dagger/MusicComponent.kt

@@ -14,7 +14,7 @@
 
 package code.name.monkey.retromusic.dagger
 
-import code.name.monkey.retromusic.activities.ArtistDetailActivity
+import code.name.monkey.retromusic.activities.artists.ArtistDetailActivity
 import code.name.monkey.retromusic.activities.GenreDetailsActivity
 import code.name.monkey.retromusic.activities.PlaylistDetailActivity
 import code.name.monkey.retromusic.activities.SearchActivity

app/src/main/java/code/name/monkey/retromusic/dagger/module/PresenterModile.kt

@@ -15,18 +15,12 @@
 package code.name.monkey.retromusic.dagger.module
 
 import android.content.Context
-import code.name.monkey.retromusic.mvp.presenter.*
+import code.name.monkey.retromusic.mvp.presenter.GenreDetailsPresenter
-import code.name.monkey.retromusic.mvp.presenter.AlbumDetailsPresenter.AlbumDetailsPresenterImpl
-import code.name.monkey.retromusic.mvp.presenter.AlbumsPresenter.AlbumsPresenterImpl
-import code.name.monkey.retromusic.mvp.presenter.ArtistDetailsPresenter.ArtistDetailsPresenterImpl
-import code.name.monkey.retromusic.mvp.presenter.ArtistsPresenter.ArtistsPresenterImpl
 import code.name.monkey.retromusic.mvp.presenter.GenreDetailsPresenter.GenreDetailsPresenterImpl
-import code.name.monkey.retromusic.mvp.presenter.GenresPresenter.GenresPresenterImpl
+import code.name.monkey.retromusic.mvp.presenter.PlaylistSongsPresenter
-import code.name.monkey.retromusic.mvp.presenter.HomePresenter.HomePresenterImpl
 import code.name.monkey.retromusic.mvp.presenter.PlaylistSongsPresenter.PlaylistSongsPresenterImpl
-import code.name.monkey.retromusic.mvp.presenter.PlaylistsPresenter.PlaylistsPresenterImpl
+import code.name.monkey.retromusic.mvp.presenter.SearchPresenter
 import code.name.monkey.retromusic.mvp.presenter.SearchPresenter.SearchPresenterImpl
-import code.name.monkey.retromusic.mvp.presenter.SongPresenter.SongPresenterImpl
 import code.name.monkey.retromusic.providers.RepositoryImpl
 import code.name.monkey.retromusic.providers.interfaces.Repository
 import dagger.Module
@@ -44,58 +38,18 @@ class PresenterModule {
         return RepositoryImpl(context)
     }
 
-    @Provides
-    fun providesAlbumsPresenter(presenter: AlbumsPresenterImpl): AlbumsPresenter {
-        return presenter
-    }
-
-    @Provides
-    fun providesAlbumDetailsPresenter(presenter: AlbumDetailsPresenterImpl): AlbumDetailsPresenter {
-        return presenter
-    }
-
-    @Provides
-    fun providesArtistDetailsPresenter(presenter: ArtistDetailsPresenterImpl): ArtistDetailsPresenter {
-        return presenter
-    }
-
-    @Provides
-    fun providesArtistsPresenter(presenter: ArtistsPresenterImpl): ArtistsPresenter {
-        return presenter
-    }
-
-    @Provides
-    fun providesGenresPresenter(presenter: GenresPresenterImpl): GenresPresenter {
-        return presenter
-    }
-
     @Provides
     fun providesGenreDetailsPresenter(presenter: GenreDetailsPresenterImpl): GenreDetailsPresenter {
         return presenter
     }
 
-    @Provides
-    fun providesHomePresenter(presenter: HomePresenterImpl): HomePresenter {
-        return presenter
-    }
-
     @Provides
     fun providesPlaylistSongPresenter(presenter: PlaylistSongsPresenterImpl): PlaylistSongsPresenter {
         return presenter
     }
 
-    @Provides
-    fun providesPlaylistsPresenter(presenter: PlaylistsPresenterImpl): PlaylistsPresenter {
-        return presenter
-    }
-
     @Provides
     fun providesSearchPresenter(presenter: SearchPresenterImpl): SearchPresenter {
         return presenter
     }
-
-    @Provides
-    fun providesSongPresenter(presenter: SongPresenterImpl): SongPresenter {
-        return presenter
-    }
 }

app/src/main/java/code/name/monkey/retromusic/dialogs/SleepTimerDialog.kt

@@ -35,7 +35,7 @@ import code.name.monkey.retromusic.helper.MusicPlayerRemote
 import code.name.monkey.retromusic.service.MusicService
 import code.name.monkey.retromusic.service.MusicService.ACTION_PENDING_QUIT
 import code.name.monkey.retromusic.service.MusicService.ACTION_QUIT
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import com.afollestad.materialdialogs.DialogAction
 import com.afollestad.materialdialogs.MaterialDialog
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
@@ -58,14 +58,14 @@ class SleepTimerDialog : DialogFragment() {
         seekBar = layout.findViewById(R.id.seekBar)
         timerDisplay = layout.findViewById(R.id.timerDisplay)
 
-        val finishMusic = PreferenceUtilKT.isSleepTimerFinishMusic
+        val finishMusic = PreferenceUtil.isSleepTimerFinishMusic
         shouldFinishLastSong.apply {
             addAccentColor()
             isChecked = finishMusic
         }
         seekBar.apply {
             addAccentColor()
-            seekArcProgress = PreferenceUtilKT.lastSleepTimerValue
+            seekArcProgress = PreferenceUtil.lastSleepTimerValue
             updateTimeDisplayTime()
             seekBar.progress = seekArcProgress
         }
@@ -84,7 +84,7 @@ class SleepTimerDialog : DialogFragment() {
             }
 
             override fun onStopTrackingTouch(seekBar: SeekBar) {
-                PreferenceUtilKT.lastSleepTimerValue = seekArcProgress
+                PreferenceUtil.lastSleepTimerValue = seekArcProgress
             }
         })
         return MaterialAlertDialogBuilder(
@@ -94,11 +94,11 @@ class SleepTimerDialog : DialogFragment() {
             .setTitle(R.string.action_sleep_timer)
             .setView(layout)
             .setPositiveButton(R.string.action_set) { _, _ ->
-                PreferenceUtilKT.isSleepTimerFinishMusic = shouldFinishLastSong.isChecked
+                PreferenceUtil.isSleepTimerFinishMusic = shouldFinishLastSong.isChecked
                 val minutes = seekArcProgress
                 val pi = makeTimerPendingIntent(PendingIntent.FLAG_CANCEL_CURRENT)
                 val nextSleepTimerElapsedTime = SystemClock.elapsedRealtime() + minutes * 60 * 1000
-                PreferenceUtilKT.nextSleepTimerElapsedRealTime = nextSleepTimerElapsedTime.toInt()
+                PreferenceUtil.nextSleepTimerElapsedRealTime = nextSleepTimerElapsedTime.toInt()
                 val am = requireContext().getSystemService(Context.ALARM_SERVICE) as AlarmManager
                 am.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, nextSleepTimerElapsedTime, pi)
 
@@ -161,7 +161,7 @@ class SleepTimerDialog : DialogFragment() {
 
     private inner class TimerUpdater internal constructor() :
         CountDownTimer(
-            PreferenceUtilKT.nextSleepTimerElapsedRealTime - SystemClock.elapsedRealtime(),
+            PreferenceUtil.nextSleepTimerElapsedRealTime - SystemClock.elapsedRealtime(),
             1000
         ) {
 

app/src/main/java/code/name/monkey/retromusic/extensions/FragmentExt.kt

@@ -5,7 +5,7 @@ import android.content.res.Configuration
 import android.os.PowerManager
 import androidx.annotation.IntegerRes
 import androidx.fragment.app.Fragment
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 
 fun Fragment.getIntRes(@IntegerRes int: Int): Int {
     return resources.getInteger(int)
@@ -16,7 +16,7 @@ fun Context.getIntRes(@IntegerRes int: Int): Int {
 }
 
 val Context.generalThemeValue
-    get() = PreferenceUtilKT.getGeneralThemeValue(isSystemDarkModeEnabled())
+    get() = PreferenceUtil.getGeneralThemeValue(isSystemDarkModeEnabled())
 
 
 fun Context.isSystemDarkModeEnabled(): Boolean {

app/src/main/java/code/name/monkey/retromusic/fragments/AlbumCoverStyle.kt

@@ -6,16 +6,15 @@ import code.name.monkey.retromusic.R
 
 
 enum class AlbumCoverStyle(
-    @param:StringRes @field:StringRes
+    @StringRes val titleRes: Int,
-    val titleRes: Int,
+    @DrawableRes val drawableResId: Int,
-    @param:DrawableRes @field:DrawableRes
+    val id: Int
-    val drawableResId: Int, val id: Int
 ) {
-    CARD(R.string.card, R.drawable.np_blur_card, 4),
+    Card(R.string.card, R.drawable.np_blur_card, 4),
-    CIRCLE(R.string.circular, R.drawable.np_circle, 2),
+    Circle(R.string.circular, R.drawable.np_circle, 2),
-    FLAT(R.string.flat, R.drawable.np_flat, 1),
+    Flat(R.string.flat, R.drawable.np_flat, 1),
-    FULL_CARD(R.string.full_card, R.drawable.np_adaptive, 6),
+    FullCard(R.string.full_card, R.drawable.np_adaptive, 6),
-    FULL(R.string.full, R.drawable.np_full, 5),
+    Full(R.string.full, R.drawable.np_full, 5),
-    MATERIAL(R.string.material, R.drawable.np_material, 3),
+    Material(R.string.material, R.drawable.np_material, 3),
-    NORMAL(R.string.normal, R.drawable.np_normal, 0),
+    Normal(R.string.normal, R.drawable.np_normal, 0),
 }

app/src/main/java/code/name/monkey/retromusic/fragments/MiniPlayerFragment.kt

@@ -19,7 +19,7 @@ import code.name.monkey.retromusic.glide.SongGlideRequest
 import code.name.monkey.retromusic.helper.MusicPlayerRemote
 import code.name.monkey.retromusic.helper.MusicProgressViewUpdateHelper
 import code.name.monkey.retromusic.helper.PlayPauseButtonOnClickHandler
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.RetroUtil
 import code.name.monkey.retromusic.util.ViewUtil
 import com.bumptech.glide.Glide
@@ -64,9 +64,9 @@ open class MiniPlayerFragment : AbsMusicServiceFragment(), MusicProgressViewUpda
 
         } else {
             actionNext.visibility =
-                if (PreferenceUtilKT.isExtraControls) View.VISIBLE else View.GONE
+                if (PreferenceUtil.isExtraControls) View.VISIBLE else View.GONE
             actionPrevious.visibility =
-                if (PreferenceUtilKT.isExtraControls) View.VISIBLE else View.GONE
+                if (PreferenceUtil.isExtraControls) View.VISIBLE else View.GONE
         }
         actionNext.setOnClickListener(this)
         actionPrevious.setOnClickListener(this)
@@ -104,7 +104,7 @@ open class MiniPlayerFragment : AbsMusicServiceFragment(), MusicProgressViewUpda
                     Glide.with(requireContext()),
                     MusicPlayerRemote.currentSong
                 ).checkIgnoreMediaStore(requireContext())
-                    .ignoreMediaStore(PreferenceUtilKT.isAllowedToDownloadMetadata())
+                    .ignoreMediaStore(PreferenceUtil.isAllowedToDownloadMetadata())
                     .asBitmap()
                     .build()
                     .into(it)

app/src/main/java/code/name/monkey/retromusic/fragments/VolumeFragment.kt

@@ -14,7 +14,7 @@ import code.name.monkey.appthemehelper.ThemeStore
 import code.name.monkey.retromusic.R
 import code.name.monkey.retromusic.extensions.applyColor
 import code.name.monkey.retromusic.helper.MusicPlayerRemote
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.volume.AudioVolumeObserver
 import code.name.monkey.retromusic.volume.OnAudioVolumeChangedListener
 import kotlinx.android.synthetic.main.fragment_volume.*
@@ -45,7 +45,7 @@ class VolumeFragment : Fragment(), SeekBar.OnSeekBarChangeListener, OnAudioVolum
         if (audioVolumeObserver == null) {
             audioVolumeObserver = AudioVolumeObserver(requireActivity())
         }
-        audioVolumeObserver!!.register(AudioManager.STREAM_MUSIC, this)
+        audioVolumeObserver?.register(AudioManager.STREAM_MUSIC, this)
 
         val audioManager = audioManager
         if (audioManager != null) {
@@ -67,9 +67,7 @@ class VolumeFragment : Fragment(), SeekBar.OnSeekBarChangeListener, OnAudioVolum
 
     override fun onDestroyView() {
         super.onDestroyView()
-        if (audioVolumeObserver != null) {
+        audioVolumeObserver?.unregister()
-            audioVolumeObserver!!.unregister()
-        }
     }
 
     override fun onProgressChanged(seekBar: SeekBar, i: Int, b: Boolean) {
@@ -113,7 +111,7 @@ class VolumeFragment : Fragment(), SeekBar.OnSeekBarChangeListener, OnAudioVolum
     }
 
     private fun setPauseWhenZeroVolume(pauseWhenZeroVolume: Boolean) {
-        if (PreferenceUtilKT.isPauseOnZeroVolume)
+        if (PreferenceUtil.isPauseOnZeroVolume)
             if (MusicPlayerRemote.isPlaying && pauseWhenZeroVolume)
                 MusicPlayerRemote.pauseSong()
 

app/src/main/java/code/name/monkey/retromusic/fragments/albums/AlbumsFragment.kt

@@ -9,7 +9,7 @@ import code.name.monkey.retromusic.adapter.album.AlbumAdapter
 import code.name.monkey.retromusic.fragments.ReloadType
 import code.name.monkey.retromusic.fragments.base.AbsLibraryPagerRecyclerViewCustomGridSizeFragment
 import code.name.monkey.retromusic.interfaces.MainActivityFragmentCallbacks
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 
 class AlbumsFragment :
     AbsLibraryPagerRecyclerViewCustomGridSizeFragment<AlbumAdapter, GridLayoutManager>(),
@@ -50,27 +50,27 @@ class AlbumsFragment :
     }
 
     override fun loadSortOrder(): String {
-        return PreferenceUtilKT.albumSortOrder
+        return PreferenceUtil.albumSortOrder
     }
 
     override fun saveSortOrder(sortOrder: String) {
-        PreferenceUtilKT.albumSortOrder = sortOrder
+        PreferenceUtil.albumSortOrder = sortOrder
     }
 
     override fun loadGridSize(): Int {
-        return PreferenceUtilKT.albumGridSize
+        return PreferenceUtil.albumGridSize
     }
 
     override fun saveGridSize(gridColumns: Int) {
-        PreferenceUtilKT.albumGridSize = gridColumns
+        PreferenceUtil.albumGridSize = gridColumns
     }
 
     override fun loadGridSizeLand(): Int {
-        return PreferenceUtilKT.albumGridSizeLand
+        return PreferenceUtil.albumGridSizeLand
     }
 
     override fun saveGridSizeLand(gridColumns: Int) {
-        PreferenceUtilKT.albumGridSizeLand = gridColumns
+        PreferenceUtil.albumGridSizeLand = gridColumns
     }
 
     override fun setSortOrder(sortOrder: String) {
@@ -78,11 +78,11 @@ class AlbumsFragment :
     }
 
     override fun loadLayoutRes(): Int {
-        return PreferenceUtilKT.albumGridStyle
+        return PreferenceUtil.albumGridStyle
     }
 
     override fun saveLayoutRes(layoutRes: Int) {
-        PreferenceUtilKT.albumGridStyle = layoutRes
+        PreferenceUtil.albumGridStyle = layoutRes
     }
 
     override fun handleBackPress(): Boolean {

app/src/main/java/code/name/monkey/retromusic/fragments/artists/ArtistsFragment.kt

@@ -9,7 +9,7 @@ import code.name.monkey.retromusic.adapter.artist.ArtistAdapter
 import code.name.monkey.retromusic.fragments.ReloadType
 import code.name.monkey.retromusic.fragments.base.AbsLibraryPagerRecyclerViewCustomGridSizeFragment
 import code.name.monkey.retromusic.interfaces.MainActivityFragmentCallbacks
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 
 class ArtistsFragment :
     AbsLibraryPagerRecyclerViewCustomGridSizeFragment<ArtistAdapter, GridLayoutManager>(),
@@ -52,19 +52,19 @@ class ArtistsFragment :
     }
 
     override fun loadGridSize(): Int {
-        return PreferenceUtilKT.artistGridSize
+        return PreferenceUtil.artistGridSize
     }
 
     override fun saveGridSize(gridColumns: Int) {
-        PreferenceUtilKT.artistGridSize = gridColumns
+        PreferenceUtil.artistGridSize = gridColumns
     }
 
     override fun loadGridSizeLand(): Int {
-        return PreferenceUtilKT.artistGridSizeLand
+        return PreferenceUtil.artistGridSizeLand
     }
 
     override fun saveGridSizeLand(gridColumns: Int) {
-        PreferenceUtilKT.artistGridSizeLand = gridColumns
+        PreferenceUtil.artistGridSizeLand = gridColumns
     }
 
     override fun setGridSize(gridSize: Int) {
@@ -73,19 +73,19 @@ class ArtistsFragment :
     }
 
     override fun loadSortOrder(): String {
-        return PreferenceUtilKT.artistSortOrder
+        return PreferenceUtil.artistSortOrder
     }
 
     override fun saveSortOrder(sortOrder: String) {
-        PreferenceUtilKT.artistSortOrder = sortOrder
+        PreferenceUtil.artistSortOrder = sortOrder
     }
 
     override fun loadLayoutRes(): Int {
-        return PreferenceUtilKT.artistGridStyle
+        return PreferenceUtil.artistGridStyle
     }
 
     override fun saveLayoutRes(layoutRes: Int) {
-        PreferenceUtilKT.artistGridStyle = layoutRes
+        PreferenceUtil.artistGridStyle = layoutRes
     }
 
     companion object {

app/src/main/java/code/name/monkey/retromusic/fragments/base/AbsPlayerControlsFragment.kt

@@ -8,7 +8,7 @@ import code.name.monkey.retromusic.R
 import code.name.monkey.retromusic.fragments.VolumeFragment
 import code.name.monkey.retromusic.helper.MusicProgressViewUpdateHelper
 
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 
 /**
@@ -63,7 +63,7 @@ abstract class AbsPlayerControlsFragment : AbsMusicServiceFragment(),
     protected var volumeFragment: VolumeFragment? = null
 
     private fun hideVolumeIfAvailable() {
-        if (PreferenceUtilKT.isVolumeVisibilityMode) {
+        if (PreferenceUtil.isVolumeVisibilityMode) {
             childFragmentManager.beginTransaction()
                 .replace(R.id.volumeFragmentContainer, VolumeFragment()).commit()
             childFragmentManager.executePendingTransactions()

app/src/main/java/code/name/monkey/retromusic/fragments/base/AbsPlayerFragment.kt

@@ -255,7 +255,7 @@ abstract class AbsPlayerFragment : AbsMusicServiceFragment(),
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
-        if (PreferenceUtilKT.isFullScreenMode &&
+        if (PreferenceUtil.isFullScreenMode &&
             view.findViewById<View>(R.id.status_bar) != null
         ) {
             view.findViewById<View>(R.id.status_bar).visibility = View.GONE

app/src/main/java/code/name/monkey/retromusic/fragments/home/BannerHomeFragment.kt

@@ -34,7 +34,7 @@ import code.name.monkey.retromusic.model.smartplaylist.HistoryPlaylist
 import code.name.monkey.retromusic.model.smartplaylist.LastAddedPlaylist
 import code.name.monkey.retromusic.model.smartplaylist.MyTopTracksPlaylist
 import code.name.monkey.retromusic.util.NavigationUtil
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import com.bumptech.glide.Glide
 import kotlinx.android.synthetic.main.abs_playlists.*
 import kotlinx.android.synthetic.main.fragment_banner_home.*
@@ -49,7 +49,7 @@ class BannerHomeFragment : AbsMainActivityFragment(), MainActivityFragmentCallba
         savedInstanceState: Bundle?
     ): View? {
         return inflater.inflate(
-            if (PreferenceUtilKT.isHomeBanner) R.layout.fragment_banner_home else R.layout.fragment_home,
+            if (PreferenceUtil.isHomeBanner) R.layout.fragment_banner_home else R.layout.fragment_home,
             viewGroup,
             false
         )
@@ -112,7 +112,7 @@ class BannerHomeFragment : AbsMainActivityFragment(), MainActivityFragmentCallba
             NavigationUtil.goToUserInfo(requireActivity(), options)
         }
         titleWelcome?.text =
-            String.format("%s", PreferenceUtilKT.userName)
+            String.format("%s", PreferenceUtil.userName)
 
         homeAdapter = HomeAdapter(mainActivity, displayMetrics)
         recyclerView.apply {

app/src/main/java/code/name/monkey/retromusic/fragments/mainactivity/FoldersFragment.java

@@ -68,7 +68,7 @@ import code.name.monkey.retromusic.misc.WrappedAsyncTaskLoader;
 import code.name.monkey.retromusic.model.Song;
 import code.name.monkey.retromusic.util.DensityUtil;
 import code.name.monkey.retromusic.util.FileUtil;
-import code.name.monkey.retromusic.util.PreferenceUtilKT;
+import code.name.monkey.retromusic.util.PreferenceUtil;
 import code.name.monkey.retromusic.util.RetroColorUtil;
 import code.name.monkey.retromusic.util.ThemedFastScroller;
 import code.name.monkey.retromusic.views.BreadCrumbLayout;
@@ -134,7 +134,7 @@ public class FoldersFragment extends AbsMainActivityFragment implements
     }
 
     public static FoldersFragment newInstance(Context context) {
-        return newInstance(PreferenceUtilKT.INSTANCE.getStartDirectory());
+        return newInstance(PreferenceUtil.INSTANCE.getStartDirectory());
     }
 
     private static File tryGetCanonicalFile(File file) {
@@ -238,7 +238,7 @@ public class FoldersFragment extends AbsMainActivityFragment implements
                                 getFileComparator()));
                         return true;
                     case R.id.action_set_as_start_directory:
-                        PreferenceUtilKT.INSTANCE.setStartDirectory(file);
+                        PreferenceUtil.INSTANCE.setStartDirectory(file);
                         Toast.makeText(getActivity(),
                                 String.format(getString(R.string.new_start_directory), file.getPath()),
                                 Toast.LENGTH_SHORT).show();
@@ -341,7 +341,7 @@ public class FoldersFragment extends AbsMainActivityFragment implements
         switch (item.getItemId()) {
             case R.id.action_go_to_start_directory:
                 setCrumb(new BreadCrumbLayout.Crumb(
-                        tryGetCanonicalFile(PreferenceUtilKT.INSTANCE.getStartDirectory())), true);
+                        tryGetCanonicalFile(PreferenceUtil.INSTANCE.getStartDirectory())), true);
                 return true;
             case R.id.action_scan:
                 BreadCrumbLayout.Crumb crumb = getActiveCrumb();

app/src/main/java/code/name/monkey/retromusic/fragments/player/PlayerAlbumCoverFragment.kt

@@ -14,7 +14,7 @@ import code.name.monkey.retromusic.helper.MusicPlayerRemote
 import code.name.monkey.retromusic.transform.CarousalPagerTransformer
 import code.name.monkey.retromusic.transform.ParallaxPagerTransformer
 
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import kotlinx.android.synthetic.main.fragment_player_album_cover.*
 
@@ -46,14 +46,14 @@ class PlayerAlbumCoverFragment : AbsMusicServiceFragment(), ViewPager.OnPageChan
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
         viewPager.addOnPageChangeListener(this)
-        val nps = PreferenceUtilKT.nowPlayingScreen
+        val nps = PreferenceUtil.nowPlayingScreen
 
         val metrics = resources.displayMetrics
         val ratio = metrics.heightPixels.toFloat() / metrics.widthPixels.toFloat()
 
         if (nps == Full || nps == Classic || nps == Fit || nps == Gradient) {
             viewPager.offscreenPageLimit = 2
-        } else if (PreferenceUtilKT.isCarouselEffect) {
+        } else if (PreferenceUtil.isCarouselEffect) {
             viewPager.clipToPadding = false
             val padding =
                 if (ratio >= 1.777f) {
@@ -68,7 +68,7 @@ class PlayerAlbumCoverFragment : AbsMusicServiceFragment(), ViewPager.OnPageChan
             viewPager.offscreenPageLimit = 2
             viewPager.setPageTransformer(
                 true,
-                PreferenceUtilKT.albumCoverTransform
+                PreferenceUtil.albumCoverTransform
             )
         }
     }

app/src/main/java/code/name/monkey/retromusic/fragments/player/adaptive/AdaptivePlaybackControlsFragment.kt

@@ -26,7 +26,7 @@ import code.name.monkey.retromusic.misc.SimpleOnSeekbarChangeListener
 import code.name.monkey.retromusic.service.MusicService
 import code.name.monkey.retromusic.util.MusicUtil
 
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import kotlinx.android.synthetic.main.fragment_adaptive_player_playback_controls.*
 
@@ -67,7 +67,7 @@ class AdaptivePlaybackControlsFragment : AbsPlayerControlsFragment() {
     }
 
     private fun updateSong() {
-        if (PreferenceUtilKT.isSongInfo) {
+        if (PreferenceUtil.isSongInfo) {
             songInfo?.text = getSongInfo(MusicPlayerRemote.currentSong)
             songInfo.show()
         } else {
@@ -131,7 +131,7 @@ class AdaptivePlaybackControlsFragment : AbsPlayerControlsFragment() {
         updatePrevNextColor()
         updatePlayPauseColor()
 
-        val colorFinal = if (PreferenceUtilKT.isAdaptiveColor) {
+        val colorFinal = if (PreferenceUtil.isAdaptiveColor) {
             color.primaryTextColor
         } else {
             ThemeStore.accentColor(requireContext())

app/src/main/java/code/name/monkey/retromusic/fragments/player/blur/BlurPlaybackControlsFragment.kt

@@ -25,7 +25,7 @@ import code.name.monkey.retromusic.helper.PlayPauseButtonOnClickHandler
 import code.name.monkey.retromusic.misc.SimpleOnSeekbarChangeListener
 import code.name.monkey.retromusic.service.MusicService
 import code.name.monkey.retromusic.util.MusicUtil
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import kotlinx.android.synthetic.main.fragment_blur_player_playback_controls.*
 
@@ -69,7 +69,7 @@ class BlurPlaybackControlsFragment : AbsPlayerControlsFragment() {
         title.text = song.title
         text.text = String.format("%s • %s", song.artistName, song.albumName)
 
-        if (PreferenceUtilKT.isSongInfo) {
+        if (PreferenceUtil.isSongInfo) {
             songInfo.show()
             songInfo?.text = getSongInfo(song)
         } else {

app/src/main/java/code/name/monkey/retromusic/fragments/player/card/CardPlaybackControlsFragment.kt

@@ -25,7 +25,7 @@ import code.name.monkey.retromusic.misc.SimpleOnSeekbarChangeListener
 import code.name.monkey.retromusic.service.MusicService
 import code.name.monkey.retromusic.util.MusicUtil
 
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import kotlinx.android.synthetic.main.fragment_card_player_playback_controls.*
 import kotlinx.android.synthetic.main.media_button.*
@@ -69,7 +69,7 @@ class CardPlaybackControlsFragment : AbsPlayerControlsFragment() {
         title.text = song.title
         text.text = song.artistName
 
-        if (PreferenceUtilKT.isSongInfo) {
+        if (PreferenceUtil.isSongInfo) {
             songInfo.text = getSongInfo(MusicPlayerRemote.currentSong)
             songInfo.show()
         } else {
@@ -129,7 +129,7 @@ class CardPlaybackControlsFragment : AbsPlayerControlsFragment() {
         updatePlayPauseColor()
         updateProgressTextColor()
 
-        val colorFinal = if (PreferenceUtilKT.isAdaptiveColor) {
+        val colorFinal = if (PreferenceUtil.isAdaptiveColor) {
             color.primaryTextColor
         } else {
             ThemeStore.accentColor(requireContext()).ripAlpha()

app/src/main/java/code/name/monkey/retromusic/fragments/player/cardblur/CardBlurPlaybackControlsFragment.kt

@@ -23,7 +23,7 @@ import code.name.monkey.retromusic.helper.PlayPauseButtonOnClickHandler
 import code.name.monkey.retromusic.misc.SimpleOnSeekbarChangeListener
 import code.name.monkey.retromusic.service.MusicService
 import code.name.monkey.retromusic.util.MusicUtil
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import kotlinx.android.synthetic.main.fragment_card_blur_player_playback_controls.*
@@ -114,7 +114,7 @@ class CardBlurPlaybackControlsFragment : AbsPlayerControlsFragment() {
     }
 
     private fun updateSong() {
-        if (PreferenceUtilKT.isSongInfo) {
+        if (PreferenceUtil.isSongInfo) {
             songInfo.text = getSongInfo(MusicPlayerRemote.currentSong)
             songInfo.show()
         } else {

app/src/main/java/code/name/monkey/retromusic/fragments/player/circle/CirclePlayerFragment.kt

@@ -44,7 +44,7 @@ import code.name.monkey.retromusic.helper.MusicProgressViewUpdateHelper.Callback
 import code.name.monkey.retromusic.helper.PlayPauseButtonOnClickHandler
 import code.name.monkey.retromusic.misc.SimpleOnSeekbarChangeListener
 import code.name.monkey.retromusic.util.MusicUtil
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 
 import code.name.monkey.retromusic.util.ViewUtil
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
@@ -196,7 +196,7 @@ class CirclePlayerFragment : AbsPlayerFragment(), Callback, OnAudioVolumeChanged
         title.text = song.title
         text.text = song.artistName
 
-        if (PreferenceUtilKT.isSongInfo) {
+        if (PreferenceUtil.isSongInfo) {
             songInfo.text = getSongInfo(song)
             songInfo.show()
         } else {

app/src/main/java/code/name/monkey/retromusic/fragments/player/classic/ClassicPlayerFragment.kt

@@ -1,6 +1,7 @@
 package code.name.monkey.retromusic.fragments.player.classic
 
 import android.animation.ObjectAnimator
+import android.annotation.SuppressLint
 import android.content.res.ColorStateList
 import android.graphics.Color
 import android.graphics.PorterDuff
@@ -37,7 +38,7 @@ import code.name.monkey.retromusic.model.Song
 import code.name.monkey.retromusic.service.MusicService
 import code.name.monkey.retromusic.util.MusicUtil
 
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.ViewUtil
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import com.google.android.material.bottomsheet.BottomSheetBehavior
@@ -85,7 +86,6 @@ class ClassicPlayerFragment : AbsPlayerFragment(), View.OnLayoutChangeListener,
 
         override fun onStateChanged(bottomSheet: View, newState: Int) {
             val activity = requireActivity() as AbsSlidingMusicPanelActivity
-            val isDark = ATHUtil.isWindowBackgroundDark(requireContext());
             when (newState) {
                 BottomSheetBehavior.STATE_EXPANDED,
                 BottomSheetBehavior.STATE_DRAGGING -> {
@@ -115,6 +115,7 @@ class ClassicPlayerFragment : AbsPlayerFragment(), View.OnLayoutChangeListener,
         return inflater.inflate(R.layout.fragment_classic_player, container, false)
     }
 
+    @SuppressLint("ClickableViewAccessibility")
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
         setupPanel()
@@ -155,7 +156,7 @@ class ClassicPlayerFragment : AbsPlayerFragment(), View.OnLayoutChangeListener,
     }
 
     private fun hideVolumeIfAvailable() {
-        if (PreferenceUtilKT.isVolumeVisibilityMode) {
+        if (PreferenceUtil.isVolumeVisibilityMode) {
             childFragmentManager.beginTransaction()
                 .replace(R.id.volumeFragmentContainer, VolumeFragment.newInstance())
                 .commit()
@@ -186,7 +187,7 @@ class ClassicPlayerFragment : AbsPlayerFragment(), View.OnLayoutChangeListener,
         title.text = song.title
         text.text = song.artistName
 
-        if (PreferenceUtilKT.isSongInfo) {
+        if (PreferenceUtil.isSongInfo) {
             songInfo.text = getSongInfo(song)
             songInfo.show()
         } else {

app/src/main/java/code/name/monkey/retromusic/fragments/player/color/ColorPlaybackControlsFragment.kt

@@ -23,7 +23,7 @@ import code.name.monkey.retromusic.helper.PlayPauseButtonOnClickHandler
 import code.name.monkey.retromusic.misc.SimpleOnSeekbarChangeListener
 import code.name.monkey.retromusic.service.MusicService
 import code.name.monkey.retromusic.util.MusicUtil
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import kotlinx.android.synthetic.main.fragment_color_player_playback_controls.*
@@ -69,7 +69,7 @@ class ColorPlaybackControlsFragment : AbsPlayerControlsFragment() {
         title.text = song.title
         text.text = song.artistName
 
-        if (PreferenceUtilKT.isSongInfo) {
+        if (PreferenceUtil.isSongInfo) {
             songInfo.text = getSongInfo(song)
             songInfo.show()
         } else {

app/src/main/java/code/name/monkey/retromusic/fragments/player/fit/FitPlaybackControlsFragment.kt

@@ -27,7 +27,7 @@ import code.name.monkey.retromusic.misc.SimpleOnSeekbarChangeListener
 import code.name.monkey.retromusic.service.MusicService
 import code.name.monkey.retromusic.util.MusicUtil
 
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import kotlinx.android.synthetic.main.fragment_fit_playback_controls.*
 
@@ -72,7 +72,7 @@ class FitPlaybackControlsFragment : AbsPlayerControlsFragment() {
         val song = MusicPlayerRemote.currentSong
         title.text = song.title
         text.text = song.artistName
-        if (PreferenceUtilKT.isSongInfo) {
+        if (PreferenceUtil.isSongInfo) {
             songInfo.text = getSongInfo(song)
             songInfo.show()
         } else {
@@ -127,7 +127,7 @@ class FitPlaybackControlsFragment : AbsPlayerControlsFragment() {
                 MaterialValueHelper.getPrimaryDisabledTextColor(activity, false)
         }
 
-        val colorFinal = if (PreferenceUtilKT.isAdaptiveColor) {
+        val colorFinal = if (PreferenceUtil.isAdaptiveColor) {
             color.primaryTextColor
         } else {
             ThemeStore.accentColor(requireContext()).ripAlpha()

app/src/main/java/code/name/monkey/retromusic/fragments/player/flat/FlatPlaybackControlsFragment.kt

@@ -28,7 +28,7 @@ import code.name.monkey.retromusic.misc.SimpleOnSeekbarChangeListener
 import code.name.monkey.retromusic.service.MusicService
 import code.name.monkey.retromusic.util.MusicUtil
 
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import kotlinx.android.synthetic.main.fragment_flat_player_playback_controls.*
 
@@ -96,7 +96,7 @@ class FlatPlaybackControlsFragment : AbsPlayerControlsFragment(), Callback {
                 MaterialValueHelper.getPrimaryDisabledTextColor(requireContext(), false)
         }
 
-        val colorFinal = if (PreferenceUtilKT.isAdaptiveColor) {
+        val colorFinal = if (PreferenceUtil.isAdaptiveColor) {
             color.primaryTextColor
         } else {
             ThemeStore.accentColor(requireContext()).ripAlpha()
@@ -166,7 +166,7 @@ class FlatPlaybackControlsFragment : AbsPlayerControlsFragment(), Callback {
         val song = MusicPlayerRemote.currentSong
         title.text = song.title
         text.text = song.artistName
-        if (PreferenceUtilKT.isSongInfo) {
+        if (PreferenceUtil.isSongInfo) {
             songInfo.text = getSongInfo(song)
             songInfo.show()
         } else {

app/src/main/java/code/name/monkey/retromusic/fragments/player/flat/FlatPlayerFragment.kt

@@ -18,7 +18,7 @@ import code.name.monkey.retromusic.fragments.player.PlayerAlbumCoverFragment
 import code.name.monkey.retromusic.helper.MusicPlayerRemote
 import code.name.monkey.retromusic.model.Song
 
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.ViewUtil
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import code.name.monkey.retromusic.views.DrawableGradient
@@ -99,7 +99,7 @@ class FlatPlayerFragment : AbsPlayerFragment() {
 
     override fun toolbarIconColor(): Int {
         val isLight = ColorUtil.isColorLight(paletteColor)
-        return if (PreferenceUtilKT.isAdaptiveColor)
+        return if (PreferenceUtil.isAdaptiveColor)
             MaterialValueHelper.getPrimaryTextColor(requireContext(), isLight)
         else
             ATHUtil.resolveColor(requireContext(), R.attr.colorControlNormal)
@@ -110,12 +110,12 @@ class FlatPlayerFragment : AbsPlayerFragment() {
         controlsFragment.setColor(color)
         callbacks?.onPaletteColorChanged()
         val isLight = ColorUtil.isColorLight(color.backgroundColor)
-        val iconColor = if (PreferenceUtilKT.isAdaptiveColor)
+        val iconColor = if (PreferenceUtil.isAdaptiveColor)
             MaterialValueHelper.getPrimaryTextColor(requireContext(), isLight)
         else
             ATHUtil.resolveColor(requireContext(), R.attr.colorControlNormal)
         ToolbarContentTintHelper.colorizeToolbar(playerToolbar, iconColor, requireActivity())
-        if (PreferenceUtilKT.isAdaptiveColor) {
+        if (PreferenceUtil.isAdaptiveColor) {
             colorize(color.backgroundColor)
         }
     }

app/src/main/java/code/name/monkey/retromusic/fragments/player/full/FullPlaybackControlsFragment.kt

@@ -29,7 +29,7 @@ import code.name.monkey.retromusic.misc.SimpleOnSeekbarChangeListener
 import code.name.monkey.retromusic.model.Song
 import code.name.monkey.retromusic.service.MusicService
 import code.name.monkey.retromusic.util.MusicUtil
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import kotlinx.android.synthetic.main.fragment_full_player_controls.*
@@ -129,7 +129,7 @@ class FullPlaybackControlsFragment : AbsPlayerControlsFragment(),
         title.text = song.title
         text.text = song.artistName
         updateIsFavorite()
-        if (PreferenceUtilKT.isSongInfo) {
+        if (PreferenceUtil.isSongInfo) {
             songInfo.text = getSongInfo(song)
             songInfo.show()
         } else {

app/src/main/java/code/name/monkey/retromusic/fragments/player/gradient/GradientPlayerFragment.kt

@@ -1,6 +1,7 @@
 package code.name.monkey.retromusic.fragments.player.gradient
 
 import android.animation.ObjectAnimator
+import android.annotation.SuppressLint
 import android.content.res.ColorStateList
 import android.graphics.Color
 import android.graphics.PorterDuff
@@ -18,7 +19,6 @@ import androidx.constraintlayout.widget.ConstraintLayout
 import androidx.core.view.ViewCompat
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
-import code.name.monkey.appthemehelper.util.ATHUtil
 import code.name.monkey.appthemehelper.util.ColorUtil
 import code.name.monkey.appthemehelper.util.TintHelper
 import code.name.monkey.retromusic.R
@@ -38,8 +38,7 @@ import code.name.monkey.retromusic.misc.SimpleOnSeekbarChangeListener
 import code.name.monkey.retromusic.model.Song
 import code.name.monkey.retromusic.service.MusicService
 import code.name.monkey.retromusic.util.MusicUtil
-
+import code.name.monkey.retromusic.util.PreferenceUtil
-import code.name.monkey.retromusic.util.PreferenceUtilKT
 import code.name.monkey.retromusic.util.ViewUtil
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import com.google.android.material.bottomsheet.BottomSheetBehavior
@@ -82,7 +81,6 @@ class GradientPlayerFragment : AbsPlayerFragment(), MusicProgressViewUpdateHelpe
 
         override fun onStateChanged(bottomSheet: View, newState: Int) {
             val activity = requireActivity() as AbsSlidingMusicPanelActivity
-            val isDark = ATHUtil.isWindowBackgroundDark(requireContext());
             when (newState) {
                 BottomSheetBehavior.STATE_EXPANDED,
                 BottomSheetBehavior.STATE_DRAGGING -> {
@@ -145,6 +143,7 @@ class GradientPlayerFragment : AbsPlayerFragment(), MusicProgressViewUpdateHelpe
         setupFavourite()
     }
 
+    @SuppressLint("ClickableViewAccessibility")
     private fun setupSheet() {
         getQueuePanel().addBottomSheetCallback(bottomSheetCallbackList)
         playerQueueSheet.setOnTouchListener { _, _ ->
@@ -205,7 +204,7 @@ class GradientPlayerFragment : AbsPlayerFragment(), MusicProgressViewUpdateHelpe
         callbacks?.onPaletteColorChanged()
         mask.backgroundTintList = ColorStateList.valueOf(color.backgroundColor)
         colorBackground.setBackgroundColor(color.backgroundColor)
-        container.setBackgroundColor(ColorUtil.darkenColor(color.backgroundColor))
+        playerQueueSheet.setBackgroundColor(ColorUtil.darkenColor(color.backgroundColor))
 
         lastPlaybackControlsColor = color.primaryTextColor
         lastDisabledPlaybackControlsColor = ColorUtil.withAlpha(color.primaryTextColor, 0.3f)
@@ -244,7 +243,7 @@ class GradientPlayerFragment : AbsPlayerFragment(), MusicProgressViewUpdateHelpe
     }
 
     private fun hideVolumeIfAvailable() {
-        if (PreferenceUtilKT.isVolumeVisibilityMode) {
+        if (PreferenceUtil.isVolumeVisibilityMode) {
             childFragmentManager.beginTransaction()
                 .replace(R.id.volumeFragmentContainer, VolumeFragment.newInstance())
                 .commit()
@@ -285,7 +284,7 @@ class GradientPlayerFragment : AbsPlayerFragment(), MusicProgressViewUpdateHelpe
         title.text = song.title
         text.text = song.artistName
         updateLabel()
-        if (PreferenceUtilKT.isSongInfo) {
+        if (PreferenceUtil.isSongInfo) {
             songInfo.text = getSongInfo(song)
             songInfo.show()
         } else {
@@ -482,12 +481,13 @@ class GradientPlayerFragment : AbsPlayerFragment(), MusicProgressViewUpdateHelpe
         songTotalTime.text = MusicUtil.getReadableDurationString(total.toLong())
         songCurrentProgress.text = MusicUtil.getReadableDurationString(progress.toLong())
     }
-
+    @SuppressLint("StaticFieldLeak")
     private fun updateFavorite() {
         if (updateIsFavoriteTask != null) {
             updateIsFavoriteTask?.cancel(false)
         }
-        updateIsFavoriteTask = object : AsyncTask<Song, Void, Boolean>() {
+        updateIsFavoriteTask =
+        object : AsyncTask<Song, Void, Boolean>() {
             override fun doInBackground(vararg params: Song): Boolean? {
                 val activity = activity
                 return if (activity != null) {

app/src/main/java/code/name/monkey/retromusic/fragments/player/lockscreen/LockScreenPlayerControlsFragment.kt

@@ -39,7 +39,7 @@ import code.name.monkey.retromusic.misc.SimpleOnSeekbarChangeListener
 import code.name.monkey.retromusic.service.MusicService
 import code.name.monkey.retromusic.util.MusicUtil
 
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import kotlinx.android.synthetic.main.fragment_lock_screen_playback_controls.*
 
@@ -126,7 +126,7 @@ class LockScreenPlayerControlsFragment : AbsPlayerControlsFragment() {
                 MaterialValueHelper.getPrimaryDisabledTextColor(requireContext(), false)
         }
 
-        val colorFinal = if (PreferenceUtilKT.isAdaptiveColor) {
+        val colorFinal = if (PreferenceUtil.isAdaptiveColor) {
             color.primaryTextColor
         } else {
             textColorSecondary()

app/src/main/java/code/name/monkey/retromusic/fragments/player/material/MaterialControlsFragment.kt

@@ -20,7 +20,7 @@ import code.name.monkey.retromusic.misc.SimpleOnSeekbarChangeListener
 import code.name.monkey.retromusic.service.MusicService
 import code.name.monkey.retromusic.util.MusicUtil
 
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import kotlinx.android.synthetic.main.fragment_material_playback_controls.*
 
@@ -57,7 +57,7 @@ class MaterialControlsFragment : AbsPlayerControlsFragment() {
         title.text = song.title
         text.text = song.artistName
 
-        if (PreferenceUtilKT.isSongInfo) {
+        if (PreferenceUtil.isSongInfo) {
             songInfo.text = getSongInfo(song)
             songInfo.show()
         } else {
@@ -114,7 +114,7 @@ class MaterialControlsFragment : AbsPlayerControlsFragment() {
         updateRepeatState()
         updateShuffleState()
 
-        val colorFinal = if (PreferenceUtilKT.isAdaptiveColor) {
+        val colorFinal = if (PreferenceUtil.isAdaptiveColor) {
             lastPlaybackControlsColor
         } else {
             textColorSecondary()

app/src/main/java/code/name/monkey/retromusic/fragments/player/normal/PlayerFragment.kt

@@ -16,7 +16,7 @@ import code.name.monkey.retromusic.fragments.player.PlayerAlbumCoverFragment
 import code.name.monkey.retromusic.helper.MusicPlayerRemote
 import code.name.monkey.retromusic.model.Song
 
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.ViewUtil
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import code.name.monkey.retromusic.views.DrawableGradient
@@ -86,7 +86,7 @@ class PlayerFragment : AbsPlayerFragment() {
             requireActivity()
         )
 
-        if (PreferenceUtilKT.isAdaptiveColor) {
+        if (PreferenceUtil.isAdaptiveColor) {
             colorize(color.backgroundColor)
         }
     }

app/src/main/java/code/name/monkey/retromusic/fragments/player/normal/PlayerPlaybackControlsFragment.kt

@@ -27,7 +27,7 @@ import code.name.monkey.retromusic.misc.SimpleOnSeekbarChangeListener
 import code.name.monkey.retromusic.service.MusicService
 import code.name.monkey.retromusic.util.MusicUtil
 
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import kotlinx.android.synthetic.main.fragment_player_playback_controls.*
 
@@ -78,7 +78,7 @@ class PlayerPlaybackControlsFragment : AbsPlayerControlsFragment() {
                 MaterialValueHelper.getPrimaryDisabledTextColor(requireContext(), false)
         }
 
-        val colorFinal = if (PreferenceUtilKT.isAdaptiveColor) {
+        val colorFinal = if (PreferenceUtil.isAdaptiveColor) {
             color.primaryTextColor
         } else {
             ThemeStore.accentColor(requireContext())
@@ -105,7 +105,7 @@ class PlayerPlaybackControlsFragment : AbsPlayerControlsFragment() {
         title.text = song.title
         text.text = song.artistName
 
-        if (PreferenceUtilKT.isSongInfo) {
+        if (PreferenceUtil.isSongInfo) {
             songInfo.text = getSongInfo(song)
             songInfo.show()
         } else {
@@ -220,7 +220,7 @@ class PlayerPlaybackControlsFragment : AbsPlayerControlsFragment() {
     }
 
     public override fun show() {
-        playPauseButton!!.animate()
+        playPauseButton.animate()
             .scaleX(1f)
             .scaleY(1f)
             .rotation(360f)
@@ -229,14 +229,12 @@ class PlayerPlaybackControlsFragment : AbsPlayerControlsFragment() {
     }
 
     public override fun hide() {
-        if (playPauseButton != null) {
+        playPauseButton.apply {
-            playPauseButton!!.apply {
             scaleX = 0f
             scaleY = 0f
             rotation = 0f
         }
     }
-    }
 
     override fun setUpProgressSlider() {
         progressSlider.setOnSeekBarChangeListener(object : SimpleOnSeekbarChangeListener() {

app/src/main/java/code/name/monkey/retromusic/fragments/player/peak/PeakPlayerControlFragment.kt

@@ -37,7 +37,7 @@ import code.name.monkey.retromusic.misc.SimpleOnSeekbarChangeListener
 import code.name.monkey.retromusic.service.MusicService
 import code.name.monkey.retromusic.util.MusicUtil
 
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import kotlinx.android.synthetic.main.fragment_peak_control_player.*
 
@@ -90,7 +90,7 @@ class PeakPlayerControlFragment : AbsPlayerControlsFragment() {
 
     override fun setColor(color: MediaNotificationProcessor) {
         val controlsColor =
-            if (PreferenceUtilKT.isAdaptiveColor) {
+            if (PreferenceUtil.isAdaptiveColor) {
                 color.primaryTextColor
             } else {
                 ThemeStore.accentColor(requireContext())

app/src/main/java/code/name/monkey/retromusic/fragments/player/peak/PeakPlayerFragment.kt

@@ -27,7 +27,7 @@ import code.name.monkey.retromusic.extensions.show
 import code.name.monkey.retromusic.fragments.base.AbsPlayerFragment
 import code.name.monkey.retromusic.fragments.player.PlayerAlbumCoverFragment
 import code.name.monkey.retromusic.helper.MusicPlayerRemote
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import kotlinx.android.synthetic.main.fragment_peak_player.*
@@ -114,7 +114,7 @@ class PeakPlayerFragment : AbsPlayerFragment() {
         title.text = song.title
         text.text = song.artistName
 
-        if (PreferenceUtilKT.isSongInfo) {
+        if (PreferenceUtil.isSongInfo) {
             songInfo.text = getSongInfo(song)
             songInfo.show()
         } else {

app/src/main/java/code/name/monkey/retromusic/fragments/player/plain/PlainPlaybackControlsFragment.kt

@@ -27,7 +27,7 @@ import code.name.monkey.retromusic.misc.SimpleOnSeekbarChangeListener
 import code.name.monkey.retromusic.service.MusicService
 import code.name.monkey.retromusic.util.MusicUtil
 
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import kotlinx.android.synthetic.main.fragment_adaptive_player_playback_controls.*
 import kotlinx.android.synthetic.main.fragment_plain_controls_fragment.nextButton
@@ -74,7 +74,7 @@ class PlainPlaybackControlsFragment : AbsPlayerControlsFragment() {
     }
 
     private fun updateSong() {
-        if (PreferenceUtilKT.isSongInfo) {
+        if (PreferenceUtil.isSongInfo) {
             songInfo.text = getSongInfo(MusicPlayerRemote.currentSong)
             songInfo.show()
         } else {
@@ -157,7 +157,7 @@ class PlainPlaybackControlsFragment : AbsPlayerControlsFragment() {
                 MaterialValueHelper.getPrimaryDisabledTextColor(requireContext(), false)
         }
 
-        val colorFinal = if (PreferenceUtilKT.isAdaptiveColor) {
+        val colorFinal = if (PreferenceUtil.isAdaptiveColor) {
             color.primaryTextColor
         } else {
             ThemeStore.accentColor(requireContext())

app/src/main/java/code/name/monkey/retromusic/fragments/player/simple/SimplePlaybackControlsFragment.kt

@@ -21,7 +21,7 @@ import code.name.monkey.retromusic.helper.PlayPauseButtonOnClickHandler
 import code.name.monkey.retromusic.service.MusicService
 import code.name.monkey.retromusic.util.MusicUtil
 
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
 import kotlinx.android.synthetic.main.fragment_simple_controls_fragment.*
 
@@ -156,7 +156,7 @@ class SimplePlaybackControlsFragment : AbsPlayerControlsFragment() {
         title.text = song.title
         text.text = song.artistName
 
-        if (PreferenceUtilKT.isSongInfo) {
+        if (PreferenceUtil.isSongInfo) {
             songInfo.text = getSongInfo(song)
             songInfo.show()
         } else {
@@ -213,7 +213,7 @@ class SimplePlaybackControlsFragment : AbsPlayerControlsFragment() {
                 MaterialValueHelper.getPrimaryDisabledTextColor(requireContext(), false)
         }
 
-        val colorFinal = if (PreferenceUtilKT.isAdaptiveColor) {
+        val colorFinal = if (PreferenceUtil.isAdaptiveColor) {
             color.primaryTextColor
         } else {
             ThemeStore.accentColor(requireContext())

app/src/main/java/code/name/monkey/retromusic/fragments/player/tiny/TinyPlayerFragment.kt

@@ -21,7 +21,7 @@ import code.name.monkey.retromusic.helper.MusicProgressViewUpdateHelper
 import code.name.monkey.retromusic.helper.PlayPauseButtonOnClickHandler
 import code.name.monkey.retromusic.model.Song
 import code.name.monkey.retromusic.util.MusicUtil
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 
 import code.name.monkey.retromusic.util.ViewUtil
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
@@ -103,7 +103,7 @@ class TinyPlayerFragment : AbsPlayerFragment(), MusicProgressViewUpdateHelper.Ca
         title.text = song.title
         text.text = String.format("%s \nby - %s", song.albumName, song.artistName)
 
-        if (PreferenceUtilKT.isSongInfo) {
+        if (PreferenceUtil.isSongInfo) {
             songInfo.text = getSongInfo(song)
             songInfo.show()
         } else {

app/src/main/java/code/name/monkey/retromusic/fragments/settings/NotificationSettingsFragment.kt

@@ -22,7 +22,7 @@ import androidx.preference.Preference
 import androidx.preference.TwoStatePreference
 import code.name.monkey.retromusic.CLASSIC_NOTIFICATION
 import code.name.monkey.retromusic.R
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 
 
 /**
@@ -47,10 +47,10 @@ class NotificationSettingsFragment : AbsSettingsFragment(),
             classicNotification?.isVisible = false
         } else {
             classicNotification?.apply {
-                isChecked = PreferenceUtilKT.isClassicNotification
+                isChecked = PreferenceUtil.isClassicNotification
                 setOnPreferenceChangeListener { _, newValue ->
                     // Save preference
-                    PreferenceUtilKT.isClassicNotification = newValue as Boolean
+                    PreferenceUtil.isClassicNotification = newValue as Boolean
                     invalidateSettings()
                     true
                 }
@@ -59,12 +59,12 @@ class NotificationSettingsFragment : AbsSettingsFragment(),
 
         val coloredNotification: TwoStatePreference? = findPreference("colored_notification")
         if (VERSION.SDK_INT >= VERSION_CODES.O) {
-            coloredNotification?.isEnabled = PreferenceUtilKT.isClassicNotification
+            coloredNotification?.isEnabled = PreferenceUtil.isClassicNotification
         } else {
             coloredNotification?.apply {
-                isChecked = PreferenceUtilKT.isColoredNotification
+                isChecked = PreferenceUtil.isColoredNotification
                 setOnPreferenceChangeListener { _, newValue ->
-                    PreferenceUtilKT.isColoredNotification = newValue as Boolean
+                    PreferenceUtil.isColoredNotification = newValue as Boolean
                     true
                 }
             }
@@ -73,12 +73,12 @@ class NotificationSettingsFragment : AbsSettingsFragment(),
 
     override fun onResume() {
         super.onResume()
-        PreferenceUtilKT.registerOnSharedPreferenceChangedListener(this)
+        PreferenceUtil.registerOnSharedPreferenceChangedListener(this)
     }
 
     override fun onDestroyView() {
         super.onDestroyView()
-        PreferenceUtilKT.unregisterOnSharedPreferenceChangedListener(this)
+        PreferenceUtil.unregisterOnSharedPreferenceChangedListener(this)
     }
 
     override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {

app/src/main/java/code/name/monkey/retromusic/fragments/settings/NowPlayingSettingsFragment.kt

@@ -20,7 +20,7 @@ import android.view.View
 import androidx.preference.Preference
 import androidx.preference.TwoStatePreference
 import code.name.monkey.retromusic.*
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 
 /**
  * @author Hemanth S (h4h13).
@@ -49,17 +49,17 @@ class NowPlayingSettingsFragment : AbsSettingsFragment(),
 
     private fun updateAlbumCoverStyleSummary() {
         val preference: Preference? = findPreference(ALBUM_COVER_STYLE)
-        preference?.setSummary(PreferenceUtilKT.albumCoverStyle.titleRes)
+        preference?.setSummary(PreferenceUtil.albumCoverStyle.titleRes)
     }
 
     private fun updateNowPlayingScreenSummary() {
         val preference: Preference? = findPreference(NOW_PLAYING_SCREEN_ID)
-        preference?.setSummary(PreferenceUtilKT.nowPlayingScreen.titleRes)
+        preference?.setSummary(PreferenceUtil.nowPlayingScreen.titleRes)
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
-        PreferenceUtilKT.registerOnSharedPreferenceChangedListener(this)
+        PreferenceUtil.registerOnSharedPreferenceChangedListener(this)
         val preference: Preference? = findPreference("album_cover_transform")
         preference?.setOnPreferenceChangeListener { albumPrefs, newValue ->
             setSummary(albumPrefs, newValue)
@@ -69,7 +69,7 @@ class NowPlayingSettingsFragment : AbsSettingsFragment(),
 
     override fun onDestroyView() {
         super.onDestroyView()
-        PreferenceUtilKT.unregisterOnSharedPreferenceChangedListener(this)
+        PreferenceUtil.unregisterOnSharedPreferenceChangedListener(this)
     }
 
     override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences, key: String) {

app/src/main/java/code/name/monkey/retromusic/fragments/settings/ThemeSettingsFragment.kt

@@ -27,7 +27,7 @@ import code.name.monkey.retromusic.App
 import code.name.monkey.retromusic.DESATURATED_COLOR
 import code.name.monkey.retromusic.R
 import code.name.monkey.retromusic.appshortcuts.DynamicShortcutManager
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import com.afollestad.materialdialogs.color.ColorChooserDialog
 
 /**
@@ -45,7 +45,7 @@ class ThemeSettingsFragment : AbsSettingsFragment() {
                 ThemeStore.markChanged(requireContext())
 
                 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N_MR1) {
-                    requireActivity().setTheme(PreferenceUtilKT.themeResFromPrefValue(theme))
+                    requireActivity().setTheme(PreferenceUtil.themeResFromPrefValue(theme))
                     DynamicShortcutManager(requireContext()).updateDynamicShortcuts()
                 }
                 requireActivity().recreate()
@@ -74,7 +74,7 @@ class ThemeSettingsFragment : AbsSettingsFragment() {
             }
             ThemeStore.markChanged(requireContext())
             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N_MR1) {
-                requireActivity().setTheme(PreferenceUtilKT.themeResFromPrefValue("black"))
+                requireActivity().setTheme(PreferenceUtil.themeResFromPrefValue("black"))
                 DynamicShortcutManager(requireContext()).updateDynamicShortcuts()
             }
             requireActivity().recreate()
@@ -88,7 +88,7 @@ class ThemeSettingsFragment : AbsSettingsFragment() {
                 .edit()
                 .putBoolean("desaturated_color", desaturated)
                 .apply()
-            PreferenceUtilKT.isDesaturatedColor = desaturated
+            PreferenceUtil.isDesaturatedColor = desaturated
             requireActivity().recreate()
             true
         }
@@ -98,9 +98,9 @@ class ThemeSettingsFragment : AbsSettingsFragment() {
         if (!VersionUtils.hasNougatMR()) {
             colorAppShortcuts.isVisible = false
         } else {
-            colorAppShortcuts.isChecked = PreferenceUtilKT.isColoredAppShortcuts
+            colorAppShortcuts.isChecked = PreferenceUtil.isColoredAppShortcuts
             colorAppShortcuts.setOnPreferenceChangeListener { _, newValue ->
-                PreferenceUtilKT.isColoredAppShortcuts = newValue as Boolean
+                PreferenceUtil.isColoredAppShortcuts = newValue as Boolean
                 DynamicShortcutManager(requireContext()).updateDynamicShortcuts()
                 true
             }

app/src/main/java/code/name/monkey/retromusic/fragments/songs/SongsFragment.kt

@@ -10,14 +10,11 @@ import code.name.monkey.retromusic.adapter.song.SongAdapter
 import code.name.monkey.retromusic.fragments.ReloadType
 import code.name.monkey.retromusic.fragments.base.AbsLibraryPagerRecyclerViewCustomGridSizeFragment
 import code.name.monkey.retromusic.interfaces.MainActivityFragmentCallbacks
-import code.name.monkey.retromusic.model.Song
+import code.name.monkey.retromusic.util.PreferenceUtil
-import code.name.monkey.retromusic.mvp.presenter.SongView
-import code.name.monkey.retromusic.util.PreferenceUtilKT
-import java.util.*
 
 class SongsFragment :
     AbsLibraryPagerRecyclerViewCustomGridSizeFragment<SongAdapter, GridLayoutManager>(),
-    SongView, MainActivityFragmentCallbacks {
+    MainActivityFragmentCallbacks {
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
         mainActivity.libraryViewModel.allSongs()
@@ -57,49 +54,41 @@ class SongsFragment :
         )
     }
 
-    override fun songs(songs: List<Song>) {
-        adapter?.swapDataSet(songs)
-    }
-
     override fun loadGridSize(): Int {
-        return PreferenceUtilKT.songGridSize
+        return PreferenceUtil.songGridSize
     }
 
     override fun saveGridSize(gridColumns: Int) {
-        PreferenceUtilKT.songGridSize = gridColumns
+        PreferenceUtil.songGridSize = gridColumns
     }
 
     override fun loadGridSizeLand(): Int {
-        return PreferenceUtilKT.songGridSizeLand
+        return PreferenceUtil.songGridSizeLand
     }
 
     override fun saveGridSizeLand(gridColumns: Int) {
-        PreferenceUtilKT.songGridSizeLand = gridColumns
+        PreferenceUtil.songGridSizeLand = gridColumns
     }
 
     override fun setGridSize(gridSize: Int) {
         adapter?.notifyDataSetChanged()
     }
  
-    override fun showEmptyView() {
-        adapter?.swapDataSet(ArrayList())
-    }
-
     override fun loadSortOrder(): String {
-        return PreferenceUtilKT.songSortOrder
+        return PreferenceUtil.songSortOrder
     }
 
     override fun saveSortOrder(sortOrder: String) {
-        PreferenceUtilKT.songSortOrder = sortOrder
+        PreferenceUtil.songSortOrder = sortOrder
     }
 
     @LayoutRes
     override fun loadLayoutRes(): Int {
-        return PreferenceUtilKT.songGridStyle
+        return PreferenceUtil.songGridStyle
     }
 
     override fun saveLayoutRes(@LayoutRes layoutRes: Int) {
-        PreferenceUtilKT.songGridStyle = layoutRes
+        PreferenceUtil.songGridStyle = layoutRes
     }
 
     override fun setSortOrder(sortOrder: String) {

app/src/main/java/code/name/monkey/retromusic/glide/AlbumGlideRequest.java

@@ -20,7 +20,7 @@ import code.name.monkey.retromusic.glide.palette.BitmapPaletteTranscoder;
 import code.name.monkey.retromusic.glide.palette.BitmapPaletteWrapper;
 import code.name.monkey.retromusic.model.Song;
 import code.name.monkey.retromusic.util.MusicUtil;
-import code.name.monkey.retromusic.util.PreferenceUtilKT;
+import code.name.monkey.retromusic.util.PreferenceUtil;
 
 public class AlbumGlideRequest {
     private static final DiskCacheStrategy DEFAULT_DISK_CACHE_STRATEGY = DiskCacheStrategy.NONE;
@@ -70,7 +70,7 @@ public class AlbumGlideRequest {
 
         @NonNull
         public Builder checkIgnoreMediaStore(@NonNull Context context) {
-            return ignoreMediaStore(PreferenceUtilKT.INSTANCE.isIgnoreMediaStoreArtwork());
+            return ignoreMediaStore(PreferenceUtil.INSTANCE.isIgnoreMediaStoreArtwork());
         }
 
         @NonNull

app/src/main/java/code/name/monkey/retromusic/glide/SongGlideRequest.java

@@ -34,7 +34,7 @@ import code.name.monkey.retromusic.glide.palette.BitmapPaletteTranscoder;
 import code.name.monkey.retromusic.glide.palette.BitmapPaletteWrapper;
 import code.name.monkey.retromusic.model.Song;
 import code.name.monkey.retromusic.util.MusicUtil;
-import code.name.monkey.retromusic.util.PreferenceUtilKT;
+import code.name.monkey.retromusic.util.PreferenceUtil;
 
 /**
  * Created by hemanths on 2019-09-15.
@@ -88,7 +88,7 @@ public class SongGlideRequest {
 
         @NonNull
         public Builder checkIgnoreMediaStore(@NonNull Context context) {
-            return ignoreMediaStore(PreferenceUtilKT.INSTANCE.isIgnoreMediaStoreArtwork());
+            return ignoreMediaStore(PreferenceUtil.INSTANCE.isIgnoreMediaStoreArtwork());
         }
 
         @NonNull

app/src/main/java/code/name/monkey/retromusic/glide/artistimage/ArtistImageLoader.kt

@@ -18,7 +18,7 @@ import android.content.Context
 import code.name.monkey.retromusic.deezer.Data
 import code.name.monkey.retromusic.deezer.DeezerApiService
 import code.name.monkey.retromusic.util.MusicUtil
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import com.bumptech.glide.Priority
 import com.bumptech.glide.integration.okhttp3.OkHttpUrlLoader
 import com.bumptech.glide.load.data.DataFetcher
@@ -63,7 +63,7 @@ class ArtistImageFetcher(
 
     override fun loadData(priority: Priority?): InputStream? {
         if (!MusicUtil.isArtistNameUnknown(model.artistName) &&
-            PreferenceUtilKT.isAllowedToDownloadMetadata()
+            PreferenceUtil.isAllowedToDownloadMetadata()
         ) {
             val artists = model.artistName.split(",")
             val response = deezerApiService.getArtistImage(artists[0]).execute()

app/src/main/java/code/name/monkey/retromusic/helper/EqualizerHelper.kt

@@ -98,7 +98,7 @@ class EqualizerHelper private constructor() : EqualizerInterface {
     }
 
     companion object {
-        private val TAG = "EqualizerHelper"
+        private const val TAG = "EqualizerHelper"
 
         @Volatile
         private var ourInstance: EqualizerHelper? = null

app/src/main/java/code/name/monkey/retromusic/helper/MusicPlayerRemote.kt

@@ -30,7 +30,7 @@ import code.name.monkey.retromusic.loaders.SongLoader
 import code.name.monkey.retromusic.model.Song
 import code.name.monkey.retromusic.service.MusicService
 
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import java.io.File
 import java.util.*
 
@@ -213,7 +213,7 @@ object MusicPlayerRemote {
             ) && musicService != null
         ) {
             musicService?.openQueue(queue, startPosition, startPlaying)
-            if (PreferenceUtilKT.isShuffleModeOn)
+            if (PreferenceUtil.isShuffleModeOn)
                 setShuffleMode(MusicService.SHUFFLE_MODE_NONE)
         }
     }

app/src/main/java/code/name/monkey/retromusic/loaders/AlbumLoader.kt

@@ -19,7 +19,7 @@ import android.provider.MediaStore.Audio.AudioColumns
 import code.name.monkey.retromusic.helper.SortOrder
 import code.name.monkey.retromusic.model.Album
 import code.name.monkey.retromusic.model.Song
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import java.util.*
 import kotlin.collections.ArrayList
 
@@ -107,7 +107,7 @@ object AlbumLoader {
     }
 
     private fun sortSongsByTrackNumber(album: Album) {
-        when (PreferenceUtilKT.albumDetailSongSortOrder) {
+        when (PreferenceUtil.albumDetailSongSortOrder) {
             SortOrder.AlbumSongSortOrder.SONG_TRACK_LIST -> album.songs?.sortWith(Comparator { o1, o2 ->
                 o1.trackNumber.compareTo(
                     o2.trackNumber
@@ -132,7 +132,7 @@ object AlbumLoader {
     }
 
     private fun getSongLoaderSortOrder(): String {
-        return PreferenceUtilKT.albumSortOrder + ", " +
+        return PreferenceUtil.albumSortOrder + ", " +
-                PreferenceUtilKT.albumSongSortOrder
+                PreferenceUtil.albumSongSortOrder
     }
 }

app/src/main/java/code/name/monkey/retromusic/loaders/ArtistLoader.kt

@@ -18,13 +18,13 @@ import android.content.Context
 import android.provider.MediaStore.Audio.AudioColumns
 import code.name.monkey.retromusic.model.Album
 import code.name.monkey.retromusic.model.Artist
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 
 object ArtistLoader {
     private fun getSongLoaderSortOrder(): String {
-        return PreferenceUtilKT.artistSortOrder + ", " +
+        return PreferenceUtil.artistSortOrder + ", " +
-                PreferenceUtilKT.artistAlbumSortOrder + ", " +
+                PreferenceUtil.artistAlbumSortOrder + ", " +
-                PreferenceUtilKT.artistSongSortOrder
+                PreferenceUtil.artistSongSortOrder
     }
 
     fun getAllArtists(context: Context): ArrayList<Artist> {

app/src/main/java/code/name/monkey/retromusic/loaders/GenreLoader.kt

@@ -19,11 +19,11 @@ import android.database.Cursor
 import android.net.Uri
 import android.provider.BaseColumns
 import android.provider.MediaStore.Audio.Genres
-import code.name.monkey.retromusic.Constants.BASE_SELECTION
+import code.name.monkey.retromusic.Constants.IS_MUSIC
 import code.name.monkey.retromusic.Constants.baseProjection
 import code.name.monkey.retromusic.model.Genre
 import code.name.monkey.retromusic.model.Song
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 
 
 object GenreLoader {
@@ -95,9 +95,9 @@ object GenreLoader {
             return context.contentResolver.query(
                 Genres.Members.getContentUri("external", genreId.toLong()),
                 baseProjection,
-                BASE_SELECTION,
+                IS_MUSIC,
                 null,
-                PreferenceUtilKT.songSortOrder
+                PreferenceUtil.songSortOrder
             )
         } catch (e: SecurityException) {
             return null
@@ -153,7 +153,7 @@ object GenreLoader {
                 projection,
                 null,
                 null,
-                PreferenceUtilKT.genreSortOrder
+                PreferenceUtil.genreSortOrder
             )
         } catch (e: SecurityException) {
             return null

app/src/main/java/code/name/monkey/retromusic/loaders/LastAddedSongsLoader.kt

@@ -20,7 +20,7 @@ import android.provider.MediaStore
 import code.name.monkey.retromusic.model.Album
 import code.name.monkey.retromusic.model.Artist
 import code.name.monkey.retromusic.model.Song
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 
 /**
  * Created by hemanths on 16/08/17.
@@ -33,7 +33,7 @@ object LastAddedSongsLoader {
     }
 
     private fun makeLastAddedCursor(context: Context): Cursor? {
-        val cutoff = PreferenceUtilKT.lastAddedCutoff
+        val cutoff = PreferenceUtil.lastAddedCutoff
         return SongLoader.makeSongCursor(
             context,
             MediaStore.Audio.Media.DATE_ADDED + ">?",

app/src/main/java/code/name/monkey/retromusic/loaders/PlaylistSongsLoader.kt

@@ -18,7 +18,7 @@ import android.content.Context
 import android.database.Cursor
 import android.provider.MediaStore
 import android.provider.MediaStore.Audio.AudioColumns
-import code.name.monkey.retromusic.Constants.BASE_SELECTION
+import code.name.monkey.retromusic.Constants.IS_MUSIC
 import code.name.monkey.retromusic.model.AbsCustomPlaylist
 import code.name.monkey.retromusic.model.Playlist
 import code.name.monkey.retromusic.model.PlaylistSong
@@ -105,7 +105,7 @@ object PlaylistSongsLoader {
                     MediaStore.Audio.Playlists.Members._ID,//11
                     AudioColumns.COMPOSER
                 )// 12
-                , BASE_SELECTION, null,
+                , IS_MUSIC, null,
                 MediaStore.Audio.Playlists.Members.DEFAULT_SORT_ORDER
             )
         } catch (e: SecurityException) {

app/src/main/java/code/name/monkey/retromusic/loaders/SongLoader.kt

@@ -18,12 +18,12 @@ import android.content.Context
 import android.database.Cursor
 import android.provider.MediaStore
 import android.provider.MediaStore.Audio.AudioColumns
-import code.name.monkey.retromusic.Constants.BASE_SELECTION
+import code.name.monkey.retromusic.Constants.IS_MUSIC
 import code.name.monkey.retromusic.Constants.baseProjection
 import code.name.monkey.retromusic.model.Song
 import code.name.monkey.retromusic.providers.BlacklistStore
 
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import java.util.*
 
 /**
@@ -107,14 +107,14 @@ object SongLoader {
         context: Context,
         selection: String?,
         selectionValues: Array<String>?,
-        sortOrder: String = PreferenceUtilKT.songSortOrder
+        sortOrder: String = PreferenceUtil.songSortOrder
     ): Cursor? {
         var selectionFinal = selection
         var selectionValuesFinal = selectionValues
         selectionFinal = if (selection != null && selection.trim { it <= ' ' } != "") {
-            "$BASE_SELECTION AND $selectionFinal"
+            "$IS_MUSIC AND $selectionFinal"
         } else {
-            BASE_SELECTION
+            IS_MUSIC
         }
 
         // Blacklist
@@ -129,7 +129,7 @@ object SongLoader {
                 MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
                 baseProjection,
                 selectionFinal + " AND " + MediaStore.Audio.Media.DURATION + ">= " +
-                        (PreferenceUtilKT.filterLength * 1000),
+                        (PreferenceUtil.filterLength * 1000),
                 selectionValuesFinal,
                 sortOrder
             )

app/src/main/java/code/name/monkey/retromusic/misc/AppBarStateChangeListener.kt

@@ -15,6 +15,7 @@
 package code.name.monkey.retromusic.misc
 
 import com.google.android.material.appbar.AppBarLayout
+import kotlin.math.abs
 
 /**
  * @author Hemanth S (h4h13).
@@ -26,23 +27,27 @@ abstract class AppBarStateChangeListener : AppBarLayout.OnOffsetChangedListener
     private var mCurrentState = State.IDLE
 
     override fun onOffsetChanged(appBarLayout: AppBarLayout, i: Int) {
-        if (i == 0) {
+        when {
+            i == 0 -> {
                 if (mCurrentState != State.EXPANDED) {
                     onStateChanged(appBarLayout, State.EXPANDED)
                 }
                 mCurrentState = State.EXPANDED
-        } else if (Math.abs(i) >= appBarLayout.totalScrollRange) {
+            }
+            abs(i) >= appBarLayout.totalScrollRange -> {
                 if (mCurrentState != State.COLLAPSED) {
                     onStateChanged(appBarLayout, State.COLLAPSED)
                 }
                 mCurrentState = State.COLLAPSED
-        } else {
+            }
+            else -> {
                 if (mCurrentState != State.IDLE) {
                     onStateChanged(appBarLayout, State.IDLE)
                 }
                 mCurrentState = State.IDLE
             }
         }
+    }
 
     abstract fun onStateChanged(appBarLayout: AppBarLayout, state: State)
 

app/src/main/java/code/name/monkey/retromusic/misc/AsyncSearchResultLoader.kt

@@ -1,51 +0,0 @@
-/*
- * Copyright (c) 2019 Hemanth Savarala.
- *
- * Licensed under the GNU General Public License v3
- *
- * This is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by
- *  the Free Software Foundation either version 3 of the License, or (at your option) any later version.
- *
- * This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
- * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- * See the GNU General Public License for more details.
- */
-
-package code.name.monkey.retromusic.misc
-
-import android.content.Context
-import android.text.TextUtils
-import code.name.monkey.retromusic.R
-import code.name.monkey.retromusic.loaders.AlbumLoader
-import code.name.monkey.retromusic.loaders.ArtistLoader
-import code.name.monkey.retromusic.loaders.SongLoader
-import java.util.*
-
-internal class AsyncSearchResultLoader(context: Context, private val query: String) :
-    WrappedAsyncTaskLoader<List<Any>>(context) {
-
-    override fun loadInBackground(): List<Any>? {
-        val results = ArrayList<Any>()
-        if (!TextUtils.isEmpty(query)) {
-            val songs = SongLoader.getSongs(context, query.trim { it <= ' ' })
-            if (!songs.isEmpty()) {
-                results.add(context.resources.getString(R.string.songs))
-                results.addAll(songs)
-            }
-
-            val artists = ArtistLoader.getArtists(context, query.trim { it <= ' ' })
-            if (!artists.isEmpty()) {
-                results.add(context.resources.getString(R.string.artists))
-                results.addAll(artists)
-            }
-
-            val albums = AlbumLoader.getAlbums(context, query.trim { it <= ' ' })
-            if (!albums.isEmpty()) {
-                results.add(context.resources.getString(R.string.albums))
-                results.addAll(albums)
-            }
-        }
-        return results
-    }
-}

app/src/main/java/code/name/monkey/retromusic/misc/SimpleAnimatorListener.kt

@@ -1,36 +0,0 @@
-/*
- * Copyright (c) 2019 Hemanth Savarala.
- *
- * Licensed under the GNU General Public License v3
- *
- * This is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by
- *  the Free Software Foundation either version 3 of the License, or (at your option) any later version.
- *
- * This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
- * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- * See the GNU General Public License for more details.
- */
-
-package code.name.monkey.retromusic.misc
-
-import android.animation.Animator
-
-
-abstract class SimpleAnimatorListener : Animator.AnimatorListener {
-    override fun onAnimationStart(animation: Animator) {
-
-    }
-
-    override fun onAnimationEnd(animation: Animator) {
-
-    }
-
-    override fun onAnimationCancel(animation: Animator) {
-
-    }
-
-    override fun onAnimationRepeat(animation: Animator) {
-
-    }
-}

app/src/main/java/code/name/monkey/retromusic/model/CategoryInfo.java

@@ -17,6 +17,9 @@ package code.name.monkey.retromusic.model;
 import android.os.Parcel;
 import android.os.Parcelable;
 
+import androidx.annotation.DrawableRes;
+import androidx.annotation.StringRes;
+
 import code.name.monkey.retromusic.R;
 
 
@@ -56,14 +59,14 @@ public class CategoryInfo implements Parcelable {
     }
 
     public enum Category {
-        HOME(R.id.action_home, R.string.home, R.drawable.ic_home_white_24dp),
+        Home(R.id.action_home, R.string.home, R.drawable.ic_home_white_24dp),
-        SONGS(R.id.action_song, R.string.songs, R.drawable.ic_audiotrack_white_24dp),
+        Songs(R.id.action_song, R.string.songs, R.drawable.ic_audiotrack_white_24dp),
-        ALBUMS(R.id.action_album, R.string.albums, R.drawable.ic_album_white_24dp),
+        Albums(R.id.action_album, R.string.albums, R.drawable.ic_album_white_24dp),
-        ARTISTS(R.id.action_artist, R.string.artists, R.drawable.ic_artist_white_24dp),
+        Artists(R.id.action_artist, R.string.artists, R.drawable.ic_artist_white_24dp),
-        PLAYLISTS(R.id.action_playlist, R.string.playlists, R.drawable.ic_playlist_play_white_24dp),
+        Playlists(R.id.action_playlist, R.string.playlists, R.drawable.ic_playlist_play_white_24dp),
-        GENRES(R.id.action_genre, R.string.genres, R.drawable.ic_guitar_white_24dp),
+        Genres(R.id.action_genre, R.string.genres, R.drawable.ic_guitar_white_24dp),
-        QUEUE(R.id.action_playing_queue, R.string.queue, R.drawable.ic_queue_music_white_24dp),
+        Queue(R.id.action_playing_queue, R.string.queue, R.drawable.ic_queue_music_white_24dp),
-        FOLDER(R.id.action_folder, R.string.folders, R.drawable.ic_folder_white_24dp);
+        Folder(R.id.action_folder, R.string.folders, R.drawable.ic_folder_white_24dp);
 
         public final int icon;
 
@@ -71,7 +74,7 @@ public class CategoryInfo implements Parcelable {
 
         public final int stringRes;
 
-        Category(int id, int stringRes, int icon) {
+        Category(int id, @StringRes int stringRes, @DrawableRes int icon) {
             this.stringRes = stringRes;
             this.id = id;
             this.icon = icon;

app/src/main/java/code/name/monkey/retromusic/mvp/presenter/AlbumDetailsPresenter.kt

@@ -16,16 +16,7 @@ package code.name.monkey.retromusic.mvp.presenter
 
 import code.name.monkey.retromusic.model.Album
 import code.name.monkey.retromusic.model.Artist
-import code.name.monkey.retromusic.mvp.Presenter
-import code.name.monkey.retromusic.mvp.PresenterImpl
-import code.name.monkey.retromusic.providers.interfaces.Repository
 import code.name.monkey.retromusic.rest.model.LastFmAlbum
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.launch
-import javax.inject.Inject
-import kotlin.coroutines.CoroutineContext
 
 /**
  * Created by hemanths on 20/08/17.
@@ -42,58 +33,3 @@ interface AlbumDetailsView {
 
     fun aboutAlbum(lastFmAlbum: LastFmAlbum)
 }
-
-interface AlbumDetailsPresenter : Presenter<AlbumDetailsView> {
-    fun loadAlbum(albumId: Int)
-
-    fun loadMore(artistId: Int)
-
-    fun aboutAlbum(artist: String, album: String)
-
-    class AlbumDetailsPresenterImpl @Inject constructor(
-        private val repository: Repository
-    ) : PresenterImpl<AlbumDetailsView>(), AlbumDetailsPresenter, CoroutineScope {
-
-        private val job = Job()
-        private lateinit var album: Album
-
-        override fun loadMore(artistId: Int) {
-            launch {
-                val result = repository.artistById(artistId)
-                showArtistImage(result)
-            }
-        }
-
-        override fun aboutAlbum(artist: String, album: String) {
-            launch {
-                val result = repository.albumInfo(artist, album)
-                view.aboutAlbum(result)
-            }
-        }
-
-        private fun showArtistImage(artist: Artist) {
-            view?.loadArtistImage(artist)
-
-            artist.albums?.filter { it.id != album.id }?.let {
-                if (it.isNotEmpty()) view?.moreAlbums(ArrayList(it))
-            }
-        }
-
-        override fun loadAlbum(albumId: Int) {
-            launch {
-                val result = repository.albumById(albumId)
-                album = result
-                view?.album(result)
-
-            }
-        }
-
-        override fun detachView() {
-            super.detachView()
-            job.cancel()
-        }
-
-        override val coroutineContext: CoroutineContext
-            get() = Dispatchers.IO + job
-    }
-}

app/src/main/java/code/name/monkey/retromusic/mvp/presenter/AlbumPresenter.kt

@@ -16,15 +16,6 @@ package code.name.monkey.retromusic.mvp.presenter
 
 import code.name.monkey.retromusic.model.Album
 import code.name.monkey.retromusic.mvp.BaseView
-import code.name.monkey.retromusic.mvp.Presenter
-import code.name.monkey.retromusic.mvp.PresenterImpl
-import code.name.monkey.retromusic.providers.interfaces.Repository
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.launch
-import javax.inject.Inject
-import kotlin.coroutines.CoroutineContext
 
 /**
  * Created by hemanths on 12/08/17.
@@ -33,30 +24,3 @@ interface AlbumsView : BaseView {
 
     fun albums(albums: List<Album>)
 }
-
-interface AlbumsPresenter : Presenter<AlbumsView> {
-
-    fun loadAlbums()
-
-    class AlbumsPresenterImpl @Inject constructor(
-        private val repository: Repository
-    ) : PresenterImpl<AlbumsView>(), AlbumsPresenter, CoroutineScope {
-
-        private val job = Job()
-
-        override val coroutineContext: CoroutineContext
-            get() = Dispatchers.IO + job
-
-        override fun detachView() {
-            super.detachView()
-            job.cancel()
-        }
-
-        override fun loadAlbums() {
-            launch {
-                val result = repository.allAlbums()
-                view?.albums(result)
-            }
-        }
-    }
-}

app/src/main/java/code/name/monkey/retromusic/mvp/presenter/ArtistDetailsPresenter.kt

@@ -16,17 +16,7 @@ package code.name.monkey.retromusic.mvp.presenter
 
 import code.name.monkey.retromusic.model.Artist
 import code.name.monkey.retromusic.mvp.BaseView
-import code.name.monkey.retromusic.mvp.Presenter
-import code.name.monkey.retromusic.mvp.PresenterImpl
-import code.name.monkey.retromusic.providers.interfaces.Repository
 import code.name.monkey.retromusic.rest.model.LastFmArtist
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.launch
-import java.util.*
-import javax.inject.Inject
-import kotlin.coroutines.CoroutineContext
 
 /**
  * Created by hemanths on 20/08/17.
@@ -39,43 +29,3 @@ interface ArtistDetailsView : BaseView {
 
     fun complete()
 }
-
-interface ArtistDetailsPresenter : Presenter<ArtistDetailsView> {
-
-    fun loadArtist(artistId: Int)
-
-    fun loadBiography(
-        name: String,
-        lang: String? = Locale.getDefault().language,
-        cache: String?
-    )
-
-    class ArtistDetailsPresenterImpl @Inject constructor(
-        private val repository: Repository
-    ) : PresenterImpl<ArtistDetailsView>(), ArtistDetailsPresenter, CoroutineScope {
-
-        override val coroutineContext: CoroutineContext
-            get() = Dispatchers.IO + job
-
-        private val job = Job()
-
-        override fun loadBiography(name: String, lang: String?, cache: String?) {
-            launch {
-                val result = repository.artistInfo(name, lang, cache)
-                view?.artistInfo(result)
-            }
-        }
-
-        override fun loadArtist(artistId: Int) {
-            launch {
-                val result = repository.artistById(artistId)
-                view?.artist(result)
-            }
-        }
-
-        override fun detachView() {
-            super.detachView()
-            job.cancel()
-        }
-    }
-}

app/src/main/java/code/name/monkey/retromusic/mvp/presenter/ArtistPresenter.kt

@@ -1,58 +0,0 @@
-/*
- * Copyright (c) 2019 Hemanth Savarala.
- *
- * Licensed under the GNU General Public License v3
- *
- * This is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by
- *  the Free Software Foundation either version 3 of the License, or (at your option) any later version.
- *
- * This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
- * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- * See the GNU General Public License for more details.
- */
-
-package code.name.monkey.retromusic.mvp.presenter
-
-import code.name.monkey.retromusic.model.Artist
-import code.name.monkey.retromusic.mvp.BaseView
-import code.name.monkey.retromusic.mvp.Presenter
-import code.name.monkey.retromusic.mvp.PresenterImpl
-import code.name.monkey.retromusic.providers.interfaces.Repository
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.launch
-import javax.inject.Inject
-import kotlin.coroutines.CoroutineContext
-
-interface ArtistsView : BaseView {
-    fun artists(artists: List<Artist>)
-}
-
-interface ArtistsPresenter : Presenter<ArtistsView> {
-
-    fun loadArtists()
-
-    class ArtistsPresenterImpl @Inject constructor(
-        private val repository: Repository
-    ) : PresenterImpl<ArtistsView>(), ArtistsPresenter, CoroutineScope {
-
-        private val job = Job()
-
-        override val coroutineContext: CoroutineContext
-            get() = Dispatchers.IO + job
-
-        override fun detachView() {
-            super.detachView()
-            job.cancel()
-        }
-
-        override fun loadArtists() {
-            launch {
-                val result = repository.allArtists()
-                view?.artists(result)
-            }
-        }
-    }
-}

app/src/main/java/code/name/monkey/retromusic/mvp/presenter/GenrePresenter.kt

@@ -1,61 +0,0 @@
-/*
- * Copyright (c) 2019 Hemanth Savarala.
- *
- * Licensed under the GNU General Public License v3
- *
- * This is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by
- *  the Free Software Foundation either version 3 of the License, or (at your option) any later version.
- *
- * This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
- * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- * See the GNU General Public License for more details.
- */
-
-package code.name.monkey.retromusic.mvp.presenter
-
-import code.name.monkey.retromusic.model.Genre
-import code.name.monkey.retromusic.mvp.BaseView
-import code.name.monkey.retromusic.mvp.Presenter
-import code.name.monkey.retromusic.mvp.PresenterImpl
-import code.name.monkey.retromusic.providers.interfaces.Repository
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.launch
-import javax.inject.Inject
-import kotlin.coroutines.CoroutineContext
-
-/**
- * @author Hemanth S (h4h13).
- */
-interface GenresView : BaseView {
-
-    fun genres(genres: List<Genre>)
-}
-
-interface GenresPresenter : Presenter<GenresView> {
-    fun loadGenres()
-
-    class GenresPresenterImpl @Inject constructor(
-        private val repository: Repository
-    ) : PresenterImpl<GenresView>(), GenresPresenter, CoroutineScope {
-
-        private val job = Job()
-
-        override val coroutineContext: CoroutineContext
-            get() = Dispatchers.IO + job
-
-        override fun detachView() {
-            super.detachView()
-            job.cancel()
-        }
-
-        override fun loadGenres() {
-            launch {
-                val result = repository.allGenres()
-                view?.genres(result)
-            }
-        }
-    }
-}

app/src/main/java/code/name/monkey/retromusic/mvp/presenter/PlaylistPresenter.kt

@@ -1,65 +0,0 @@
-/*
- * Copyright (c) 2019 Hemanth Savarala.
- *
- * Licensed under the GNU General Public License v3
- *
- * This is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by
- *  the Free Software Foundation either version 3 of the License, or (at your option) any later version.
- *
- * This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
- * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- * See the GNU General Public License for more details.
- */
-
-package code.name.monkey.retromusic.mvp.presenter
-
-import code.name.monkey.retromusic.model.Playlist
-import code.name.monkey.retromusic.mvp.BaseView
-import code.name.monkey.retromusic.mvp.Presenter
-import code.name.monkey.retromusic.mvp.PresenterImpl
-import code.name.monkey.retromusic.providers.interfaces.Repository
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.launch
-import javax.inject.Inject
-import kotlin.coroutines.CoroutineContext
-
-/**
- * Created by hemanths on 19/08/17.
- */
-
-interface PlaylistView : BaseView {
-
-    fun playlists(playlists: List<Playlist>)
-}
-
-interface PlaylistsPresenter : Presenter<PlaylistView> {
-
-    fun playlists()
-
-    class PlaylistsPresenterImpl @Inject constructor(
-        private val repository: Repository
-    ) : PresenterImpl<PlaylistView>(), PlaylistsPresenter, CoroutineScope {
-
-        private val job = Job()
-
-        override val coroutineContext: CoroutineContext
-            get() = Dispatchers.IO + job
-
-        override fun detachView() {
-            super.detachView()
-            job.cancel()
-        }
-
-        override fun playlists() {
-            launch {
-                val result = repository.allPlaylists()
-                view?.playlists(result)
-            }
-        }
-    }
-}
-
-

app/src/main/java/code/name/monkey/retromusic/mvp/presenter/SearchPresenter.kt

@@ -18,10 +18,7 @@ import code.name.monkey.retromusic.mvp.BaseView
 import code.name.monkey.retromusic.mvp.Presenter
 import code.name.monkey.retromusic.mvp.PresenterImpl
 import code.name.monkey.retromusic.providers.interfaces.Repository
-import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.*
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.launch
 import javax.inject.Inject
 import kotlin.coroutines.CoroutineContext
 
@@ -55,7 +52,7 @@ interface SearchPresenter : Presenter<SearchView> {
         override fun search(query: String?) {
             launch {
                 val result = repository.search(query)
-                view?.showData(result)
+                withContext(Dispatchers.Main) { view?.showData(result) }
             }
         }
     }

app/src/main/java/code/name/monkey/retromusic/mvp/presenter/SongPresenter.kt

@@ -1,65 +0,0 @@
-/*
- * Copyright (c) 2019 Hemanth Savarala.
- *
- * Licensed under the GNU General Public License v3
- *
- * This is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by
- *  the Free Software Foundation either version 3 of the License, or (at your option) any later version.
- *
- * This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
- * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- * See the GNU General Public License for more details.
- */
-
-package code.name.monkey.retromusic.mvp.presenter
-
-import code.name.monkey.retromusic.model.Song
-import code.name.monkey.retromusic.mvp.Presenter
-import code.name.monkey.retromusic.mvp.PresenterImpl
-import code.name.monkey.retromusic.providers.interfaces.Repository
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.Job
-import kotlinx.coroutines.launch
-import javax.inject.Inject
-import kotlin.coroutines.CoroutineContext
-
-/**
- * Created by hemanths on 10/08/17.
- */
-interface SongView {
-
-    fun songs(songs: List<Song>)
-
-    fun showEmptyView()
-}
-
-interface SongPresenter : Presenter<SongView> {
-
-    fun loadSongs()
-
-    class SongPresenterImpl @Inject constructor(
-        private val repository: Repository
-    ) : PresenterImpl<SongView>(), SongPresenter, CoroutineScope {
-
-        private var job: Job = Job()
-
-        override val coroutineContext: CoroutineContext
-            get() = Dispatchers.IO + job
-
-        override fun loadSongs() {
-            launch {
-                val songs = repository.allSongs()
-                view?.songs(songs)
-            }
-        }
-
-        override fun detachView() {
-            super.detachView()
-            job.cancel()
-        }
-    }
-}
-
-

app/src/main/java/code/name/monkey/retromusic/preferences/AlbumCoverStylePreferenceDialog.kt

@@ -37,7 +37,7 @@ import code.name.monkey.retromusic.extensions.colorControlNormal
 import code.name.monkey.retromusic.fragments.AlbumCoverStyle
 import code.name.monkey.retromusic.fragments.AlbumCoverStyle.*
 import code.name.monkey.retromusic.util.NavigationUtil
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.ViewUtil
 import com.bumptech.glide.Glide
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
@@ -77,7 +77,7 @@ class AlbumCoverStylePreferenceDialog : DialogFragment(),
         viewPager.adapter = AlbumCoverStyleAdapter(requireContext())
         viewPager.addOnPageChangeListener(this)
         viewPager.pageMargin = ViewUtil.convertDpToPixel(32f, resources).toInt()
-        viewPager.currentItem = PreferenceUtilKT.albumCoverStyle.ordinal
+        viewPager.currentItem = PreferenceUtil.albumCoverStyle.ordinal
 
         return MaterialAlertDialogBuilder(requireActivity(),
             R.style.ThemeOverlay_MaterialComponents_Dialog_Alert)
@@ -89,7 +89,7 @@ class AlbumCoverStylePreferenceDialog : DialogFragment(),
                     Toast.makeText(context, result, Toast.LENGTH_SHORT).show()
                     NavigationUtil.goToProVersion(requireActivity())
                 } else {
-                    PreferenceUtilKT.albumCoverStyle = coverStyle
+                    PreferenceUtil.albumCoverStyle = coverStyle
                 }
             }
             .setView(view)
@@ -164,5 +164,5 @@ class AlbumCoverStylePreferenceDialog : DialogFragment(),
 }
 
 private fun isAlbumCoverStyle(style: AlbumCoverStyle): Boolean {
-    return (!App.isProVersion() && (style == CIRCLE || style == CARD || style == FULL_CARD))
+    return (!App.isProVersion() && (style == Circle || style == Card || style == FullCard))
 }

app/src/main/java/code/name/monkey/retromusic/preferences/LibraryPreference.kt

@@ -31,7 +31,7 @@ import code.name.monkey.retromusic.R
 import code.name.monkey.retromusic.adapter.CategoryInfoAdapter
 import code.name.monkey.retromusic.extensions.colorControlNormal
 import code.name.monkey.retromusic.model.CategoryInfo
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
 
 
@@ -57,7 +57,7 @@ class LibraryPreferenceDialog : DialogFragment() {
             .inflate(R.layout.preference_dialog_library_categories, null)
 
         val categoryAdapter = CategoryInfoAdapter()
-        categoryAdapter.categoryInfos = PreferenceUtilKT.libraryCategory
+        categoryAdapter.categoryInfos = PreferenceUtil.libraryCategory
         val recyclerView = view.findViewById<RecyclerView>(R.id.recycler_view)
         recyclerView.layoutManager = LinearLayoutManager(activity)
         recyclerView.adapter = categoryAdapter
@@ -72,7 +72,7 @@ class LibraryPreferenceDialog : DialogFragment() {
             .setNeutralButton(
                 R.string.reset_action
             ) { _, _ ->
-                categoryAdapter.categoryInfos = PreferenceUtilKT.defaultCategories
+                categoryAdapter.categoryInfos = PreferenceUtil.defaultCategories
             }
             .setNegativeButton(android.R.string.cancel, null)
             .setPositiveButton(
@@ -88,7 +88,7 @@ class LibraryPreferenceDialog : DialogFragment() {
             Toast.makeText(context, "Not more than 5 items", Toast.LENGTH_SHORT).show()
             return
         }
-        PreferenceUtilKT.libraryCategory = categories
+        PreferenceUtil.libraryCategory = categories
     }
 
     private fun getSelected(categories: List<CategoryInfo>): Int {

app/src/main/java/code/name/monkey/retromusic/preferences/MaterialListPreference.kt

@@ -1,135 +0,0 @@
-/*
- * Copyright (c) 2019 Hemanth Savarala.
- *
- * Licensed under the GNU General Public License v3
- *
- * This is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by
- *  the Free Software Foundation either version 3 of the License, or (at your option) any later version.
- *
- * This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
- * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
- * See the GNU General Public License for more details.
- */
-
-package code.name.monkey.retromusic.preferences
-
-import android.app.Dialog
-import android.content.Context
-import android.content.res.TypedArray
-import android.os.Bundle
-import android.util.AttributeSet
-import androidx.core.graphics.BlendModeColorFilterCompat
-import androidx.core.graphics.BlendModeCompat.SRC_IN
-import androidx.preference.ListPreference
-import androidx.preference.PreferenceDialogFragmentCompat
-import code.name.monkey.retromusic.R
-import code.name.monkey.retromusic.extensions.colorControlNormal
-import com.afollestad.materialdialogs.MaterialDialog
-import com.google.android.material.dialog.MaterialAlertDialogBuilder
-
-class MaterialListPreference @JvmOverloads constructor(
-    context: Context,
-    attrs: AttributeSet? = null,
-    defStyleAttr: Int = -1,
-    defStyleRes: Int = -1
-) : ListPreference(context, attrs, defStyleAttr, defStyleRes) {
-
-    private val mLayoutRes = R.layout.ate_preference_list
-
-    init {
-        icon?.colorFilter = BlendModeColorFilterCompat.createBlendModeColorFilterCompat(
-            context.colorControlNormal(),
-            SRC_IN
-        )
-    }
-
-    override fun getDialogLayoutResource(): Int {
-        return mLayoutRes
-    }
-
-    override fun onGetDefaultValue(a: TypedArray, index: Int): String {
-        // Default value from attribute. Fallback value is set to 0.
-        return a.getString(index)!!
-    }
-
-    fun setCustomValue(any: Any) {
-        when (any) {
-            is String -> persistString(any)
-            is Int -> persistInt(any)
-            is Boolean -> persistBoolean(any)
-        }
-    }
-}
-
-class MaterialListPreferenceDialog : PreferenceDialogFragmentCompat() {
-
-    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
-        val materialListPreference = preference as MaterialListPreference
-        val entries = arguments?.getStringArrayList(EXTRA_ENTRIES)
-        val entriesValues = arguments?.getStringArrayList(EXTRA_ENTRIES_VALUES)
-        val position: Int = arguments?.getInt(EXTRA_POSITION) ?: 0
-        /* materialDialog = MaterialDialog(requireContext())
-             .title(text = materialListPreference.title.toString())
-             .positiveButton(R.string.set)
-             .listItemsSingleChoice(
-                 items = entries,
-                 initialSelection = position,
-                 waitForPositiveButton = true
-             ) { _, index, _ ->
-                 entriesValues?.let {
-                     materialListPreference.callChangeListener(it[index])
-                     materialListPreference.setCustomValue(it[index])
-                 }
-                 entries?.let {
-                     materialListPreference.summary = it[index]
-                     val value = materialListPreference.entryValues[index].toString()
-                     if (materialListPreference.callChangeListener(value)) {
-                         materialListPreference.value = value
-                     }
-                 }
-                 dismiss()
-             }
-         materialDialog.getActionButton(WhichButton.POSITIVE)
-             .updateTextColor(ThemeStore.accentColor(requireContext()))
-         return materialDialog*/
-        return MaterialAlertDialogBuilder(requireContext()).create()
-    }
-
-    override fun onDestroyView() {
-        super.onDestroyView()
-        materialDialog.dismiss()
-    }
-
-    private lateinit var materialDialog: MaterialDialog
-
-    override fun onDialogClosed(positiveResult: Boolean) {
-        if (positiveResult) {
-            materialDialog.dismiss()
-        }
-    }
-
-    companion object {
-
-        private const val EXTRA_KEY = "key"
-        private const val EXTRA_TITLE = "title"
-        private const val EXTRA_POSITION = "position"
-        private const val EXTRA_ENTRIES = "extra_entries"
-        private const val EXTRA_ENTRIES_VALUES = "extra_entries_values"
-
-        fun newInstance(listPreference: ListPreference): MaterialListPreferenceDialog {
-            val entries = listPreference.entries.toList() as ArrayList<String>
-            val entriesValues = listPreference.entryValues.toList() as ArrayList<String>
-            val position = listPreference.findIndexOfValue(listPreference.value)
-            val args = Bundle()
-            args.putString(ARG_KEY, listPreference.key)
-            args.putString(EXTRA_TITLE, listPreference.title.toString())
-            args.putInt(EXTRA_POSITION, position)
-            args.putStringArrayList(EXTRA_ENTRIES, entries)
-            args.putStringArrayList(EXTRA_ENTRIES_VALUES, entriesValues)
-            val fragment = MaterialListPreferenceDialog()
-            fragment.arguments = args
-            return fragment
-        }
-    }
-}

app/src/main/java/code/name/monkey/retromusic/preferences/NowPlayingScreenPreferenceDialog.kt

@@ -36,7 +36,7 @@ import code.name.monkey.retromusic.extensions.colorControlNormal
 import code.name.monkey.retromusic.fragments.NowPlayingScreen
 import code.name.monkey.retromusic.fragments.NowPlayingScreen.*
 import code.name.monkey.retromusic.util.NavigationUtil
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.ViewUtil
 import com.bumptech.glide.Glide
 import com.google.android.material.dialog.MaterialAlertDialogBuilder
@@ -84,7 +84,7 @@ class NowPlayingScreenPreferenceDialog : DialogFragment(), ViewPager.OnPageChang
         viewPager.adapter = NowPlayingScreenAdapter(requireContext())
         viewPager.addOnPageChangeListener(this)
         viewPager.pageMargin = ViewUtil.convertDpToPixel(32f, resources).toInt()
-        viewPager.currentItem = PreferenceUtilKT.nowPlayingScreen.ordinal
+        viewPager.currentItem = PreferenceUtil.nowPlayingScreen.ordinal
 
         return MaterialAlertDialogBuilder(
             requireContext(),
@@ -100,7 +100,7 @@ class NowPlayingScreenPreferenceDialog : DialogFragment(), ViewPager.OnPageChang
                     Toast.makeText(context, result, Toast.LENGTH_SHORT).show()
                     NavigationUtil.goToProVersion(requireContext())
                 } else {
-                    PreferenceUtilKT.nowPlayingScreen = nowPlayingScreen
+                    PreferenceUtil.nowPlayingScreen = nowPlayingScreen
                 }
             }
             .setView(view)

app/src/main/java/code/name/monkey/retromusic/providers/BlacklistStore.java

@@ -28,7 +28,7 @@ import java.io.File;
 import java.util.ArrayList;
 
 import code.name.monkey.retromusic.util.FileUtil;
-import code.name.monkey.retromusic.util.PreferenceUtilKT;
+import code.name.monkey.retromusic.util.PreferenceUtil;
 
 import static code.name.monkey.retromusic.service.MusicService.MEDIA_STORE_CHANGED;
 
@@ -47,13 +47,13 @@ public class BlacklistStore extends SQLiteOpenHelper {
     public static synchronized BlacklistStore getInstance(@NonNull final Context context) {
         if (sInstance == null) {
             sInstance = new BlacklistStore(context.getApplicationContext());
-            if (!PreferenceUtilKT.INSTANCE.isInitializedBlacklist()) {
+            if (!PreferenceUtil.INSTANCE.isInitializedBlacklist()) {
                 // blacklisted by default
                 sInstance.addPathImpl(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_ALARMS));
                 sInstance.addPathImpl(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_NOTIFICATIONS));
                 sInstance.addPathImpl(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_RINGTONES));
 
-                PreferenceUtilKT.INSTANCE.setInitializedBlacklist(true);
+                PreferenceUtil.INSTANCE.setInitializedBlacklist(true);
             }
         }
         return sInstance;

app/src/main/java/code/name/monkey/retromusic/service/MultiPlayer.java

@@ -29,7 +29,7 @@ import androidx.annotation.Nullable;
 
 import code.name.monkey.retromusic.R;
 import code.name.monkey.retromusic.service.playback.Playback;
-import code.name.monkey.retromusic.util.PreferenceUtilKT;
+import code.name.monkey.retromusic.util.PreferenceUtil;
 
 /**
  * @author Andrew Neal, Karim Abou Zeid (kabouzeid)
@@ -130,7 +130,7 @@ public class MultiPlayer implements Playback, MediaPlayer.OnErrorListener, Media
         if (path == null) {
             return;
         }
-        if (PreferenceUtilKT.INSTANCE.isGapLessPlayback()) {
+        if (PreferenceUtil.INSTANCE.isGapLessPlayback()) {
             mNextMediaPlayer = new MediaPlayer();
             mNextMediaPlayer.setWakeMode(context, PowerManager.PARTIAL_WAKE_LOCK);
             mNextMediaPlayer.setAudioSessionId(getAudioSessionId());

app/src/main/java/code/name/monkey/retromusic/service/MusicService.java

@@ -81,7 +81,7 @@ import code.name.monkey.retromusic.service.notification.PlayingNotificationImpl;
 import code.name.monkey.retromusic.service.notification.PlayingNotificationOreo;
 import code.name.monkey.retromusic.service.playback.Playback;
 import code.name.monkey.retromusic.util.MusicUtil;
-import code.name.monkey.retromusic.util.PreferenceUtilKT;
+import code.name.monkey.retromusic.util.PreferenceUtil;
 import code.name.monkey.retromusic.util.RetroUtil;
 
 import static code.name.monkey.retromusic.ConstantsKt.ALBUM_ART_ON_LOCKSCREEN;
@@ -257,7 +257,7 @@ public class MusicService extends Service implements
             String action = intent.getAction();
             if (action != null) {
                 if (BluetoothDevice.ACTION_ACL_CONNECTED.equals(action) &&
-                        PreferenceUtilKT.INSTANCE.isBluetoothSpeaker()) {
+                        PreferenceUtil.INSTANCE.isBluetoothSpeaker()) {
                     if (VERSION.SDK_INT >= VERSION_CODES.M) {
                         if (getAudioManager().getDevices(AudioManager.GET_DEVICES_OUTPUTS).length > 0) {
                             play();
@@ -388,7 +388,7 @@ public class MusicService extends Service implements
         getContentResolver()
                 .registerContentObserver(MediaStore.Audio.Playlists.INTERNAL_CONTENT_URI, true, mediaStoreObserver);
 
-        PreferenceUtilKT.INSTANCE.registerOnSharedPreferenceChangedListener(this);
+        PreferenceUtil.INSTANCE.registerOnSharedPreferenceChangedListener(this);
 
         restoreState();
 
@@ -418,7 +418,7 @@ public class MusicService extends Service implements
         quit();
         releaseResources();
         getContentResolver().unregisterContentObserver(mediaStoreObserver);
-        PreferenceUtilKT.INSTANCE.unregisterOnSharedPreferenceChangedListener(this);
+        PreferenceUtil.INSTANCE.unregisterOnSharedPreferenceChangedListener(this);
         wakeLock.release();
 
         sendBroadcast(new Intent("code.name.monkey.retromusic.RETRO_MUSIC_SERVICE_DESTROYED"));
@@ -664,7 +664,7 @@ public class MusicService extends Service implements
 
     public void initNotification() {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N &&
-                !PreferenceUtilKT.INSTANCE.isClassicNotification()) {
+                !PreferenceUtil.INSTANCE.isClassicNotification()) {
             playingNotification = new PlayingNotificationImpl();
         } else {
             playingNotification = new PlayingNotificationOreo();
@@ -1110,13 +1110,13 @@ public class MusicService extends Service implements
                 .putBitmap(MediaMetadataCompat.METADATA_KEY_ALBUM_ART, null)
                 .putLong(MediaMetadataCompat.METADATA_KEY_NUM_TRACKS, getPlayingQueue().size());
 
-        if (PreferenceUtilKT.INSTANCE.isAlbumArtOnLockScreen()) {
+        if (PreferenceUtil.INSTANCE.isAlbumArtOnLockScreen()) {
             final Point screenSize = RetroUtil.getScreenSize(MusicService.this);
             final BitmapRequestBuilder<?, Bitmap> request = SongGlideRequest.Builder
                     .from(Glide.with(MusicService.this), song)
                     .checkIgnoreMediaStore(MusicService.this)
                     .asBitmap().build();
-            if (PreferenceUtilKT.INSTANCE.isBlurredAlbumArt()) {
+            if (PreferenceUtil.INSTANCE.isBlurredAlbumArt()) {
                 request.transform(new BlurTransformation.Builder(MusicService.this).build());
             }
             runOnUiThread(new Runnable() {
@@ -1259,7 +1259,7 @@ public class MusicService extends Service implements
     }
 
     private void registerHeadsetEvents() {
-        if (!headsetReceiverRegistered && PreferenceUtilKT.INSTANCE.isHeadsetPlugged()) {
+        if (!headsetReceiverRegistered && PreferenceUtil.INSTANCE.isHeadsetPlugged()) {
             registerReceiver(headsetReceiver, headsetReceiverIntentFilter);
             headsetReceiverRegistered = true;
         }

app/src/main/java/code/name/monkey/retromusic/service/PlaybackHandler.java

@@ -23,7 +23,7 @@ import androidx.annotation.NonNull;
 
 import java.lang.ref.WeakReference;
 
-import code.name.monkey.retromusic.util.PreferenceUtilKT;
+import code.name.monkey.retromusic.util.PreferenceUtil;
 
 import static code.name.monkey.retromusic.service.MusicService.DUCK;
 import static code.name.monkey.retromusic.service.MusicService.META_CHANGED;
@@ -52,7 +52,7 @@ class PlaybackHandler extends Handler {
 
         switch (msg.what) {
             case MusicService.DUCK:
-                if (PreferenceUtilKT.INSTANCE.isAudioDucking()) {
+                if (PreferenceUtil.INSTANCE.isAudioDucking()) {
                     currentDuckVolume -= .05f;
                     if (currentDuckVolume > .2f) {
                         sendEmptyMessageDelayed(DUCK, 10);
@@ -66,7 +66,7 @@ class PlaybackHandler extends Handler {
                 break;
 
             case MusicService.UNDUCK:
-                if (PreferenceUtilKT.INSTANCE.isAudioDucking()) {
+                if (PreferenceUtil.INSTANCE.isAudioDucking()) {
                     currentDuckVolume += .03f;
                     if (currentDuckVolume < 1f) {
                         sendEmptyMessageDelayed(MusicService.UNDUCK, 10);

app/src/main/java/code/name/monkey/retromusic/service/notification/PlayingNotificationImpl.kt

@@ -32,7 +32,7 @@ import code.name.monkey.retromusic.glide.palette.BitmapPaletteWrapper
 import code.name.monkey.retromusic.service.MusicService
 import code.name.monkey.retromusic.service.MusicService.*
 import code.name.monkey.retromusic.util.MusicUtil
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.RetroColorUtil
 import com.bumptech.glide.Glide
 import com.bumptech.glide.request.animation.GlideAnimation
@@ -150,7 +150,7 @@ class PlayingNotificationImpl : PlayingNotification() {
                             )
                                 .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
                             if (Build.VERSION.SDK_INT <=
-                                Build.VERSION_CODES.O && PreferenceUtilKT.isColoredNotification
+                                Build.VERSION_CODES.O && PreferenceUtil.isColoredNotification
                             ) {
                                 builder.color = color
                             }

app/src/main/java/code/name/monkey/retromusic/service/notification/PlayingNotificationOreo.kt

@@ -33,7 +33,7 @@ import code.name.monkey.retromusic.glide.palette.BitmapPaletteWrapper
 import code.name.monkey.retromusic.model.Song
 import code.name.monkey.retromusic.service.MusicService
 import code.name.monkey.retromusic.service.MusicService.*
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.RetroUtil
 import code.name.monkey.retromusic.util.RetroUtil.createBitmap
 import code.name.monkey.retromusic.util.color.MediaNotificationProcessor
@@ -143,7 +143,7 @@ class PlayingNotificationOreo : PlayingNotification() {
                             )
                         }
 
-                        if (!PreferenceUtilKT.isColoredNotification) {
+                        if (!PreferenceUtil.isColoredNotification) {
                             bgColorFinal = resolveColor(service, R.attr.colorPrimary, Color.WHITE)
                         }
                         setBackgroundColor(bgColorFinal)

app/src/main/java/code/name/monkey/retromusic/util/NavigationUtil.java

@@ -30,7 +30,7 @@ import org.jetbrains.annotations.NotNull;
 import code.name.monkey.retromusic.R;
 import code.name.monkey.retromusic.activities.AboutActivity;
 import code.name.monkey.retromusic.activities.albums.AlbumDetailsActivity;
-import code.name.monkey.retromusic.activities.ArtistDetailActivity;
+import code.name.monkey.retromusic.activities.artists.ArtistDetailActivity;
 import code.name.monkey.retromusic.activities.DriveModeActivity;
 import code.name.monkey.retromusic.activities.GenreDetailsActivity;
 import code.name.monkey.retromusic.activities.LicenseActivity;

app/src/main/java/code/name/monkey/retromusic/util/PlaylistsUtil.java

@@ -42,58 +42,25 @@ import static android.provider.MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI;
 
 public class PlaylistsUtil {
 
-    public static void addToPlaylist(@NonNull Context context,
-                                     @NonNull List<Song> songs,
-                                     int playlistId,
-                                     boolean showToastOnFinish) {
-
-        ArrayList<Song> noSongs = new ArrayList<Song>();
-        for (Song song : songs) {
-            if (!doPlaylistContains(context, playlistId, song.getId())) {
-                noSongs.add(song);
-            }
-        }
-
-        final int size = noSongs.size();
-        final ContentResolver resolver = context.getContentResolver();
-        final String[] projection = new String[]{"max(" + MediaStore.Audio.Playlists.Members.PLAY_ORDER + ")",};
-        final Uri uri = MediaStore.Audio.Playlists.Members.getContentUri("external", playlistId);
-
-        int base = 0;
-        try (Cursor cursor = resolver.query(uri, projection, null, null, null)) {
-
-            if (cursor != null && cursor.moveToFirst()) {
-                base = cursor.getInt(0) + 1;
-            }
-        } catch (SecurityException ignored) {
-        }
-
-        int numInserted = 0;
-        for (int offSet = 0; offSet < size; offSet += 1000) {
-            numInserted += resolver.bulkInsert(uri, makeInsertItems(noSongs, offSet, 1000, base));
-        }
-
-        if (showToastOnFinish) {
-            Toast.makeText(context, context.getResources().getString(
-                    R.string.inserted_x_songs_into_playlist_x, numInserted, getNameForPlaylist(context, playlistId)),
-                    Toast.LENGTH_SHORT).show();
-        }
-    }
-
     public static int createPlaylist(@NonNull final Context context, @Nullable final String name) {
         int id = -1;
         if (name != null && name.length() > 0) {
             try {
-                Cursor cursor = context.getContentResolver()
+                Cursor cursor = context.getContentResolver().query(EXTERNAL_CONTENT_URI,
-                        .query(EXTERNAL_CONTENT_URI, new String[]{MediaStore.Audio.Playlists._ID},
+                        new String[]{MediaStore.Audio.Playlists._ID},
-                                MediaStore.Audio.PlaylistsColumns.NAME + "=?", new String[]{name}, null);
+                        MediaStore.Audio.PlaylistsColumns.NAME + "=?", new String[]{name},
+                        null);
                 if (cursor == null || cursor.getCount() < 1) {
                     final ContentValues values = new ContentValues(1);
                     values.put(MediaStore.Audio.PlaylistsColumns.NAME, name);
-                    final Uri uri = context.getContentResolver().insert(EXTERNAL_CONTENT_URI, values);
+                    final Uri uri = context.getContentResolver().insert(
+                            EXTERNAL_CONTENT_URI,
+                            values);
                     if (uri != null) {
-                        Toast.makeText(context, context.getResources().getString(R.string.created_playlist_x, name),
+                        // Necessary because somehow the MediaStoreObserver is not notified when adding a playlist
-                                Toast.LENGTH_SHORT).show();
+                        context.getContentResolver().notifyChange(Uri.parse("content://media"), null);
+                        Toast.makeText(context, context.getResources().getString(
+                                R.string.created_playlist_x, name), Toast.LENGTH_SHORT).show();
                         id = Integer.parseInt(uri.getLastPathSegment());
                     }
                 } else {
@@ -105,7 +72,8 @@ public class PlaylistsUtil {
                 if (cursor != null) {
                     cursor.close();
                 }
-            } catch (SecurityException ignored) {
+            } catch (SecurityException e) {
+                e.printStackTrace();
             }
         }
         if (id == -1) {
@@ -115,7 +83,7 @@ public class PlaylistsUtil {
         return id;
     }
 
-    public static void deletePlaylists(@NonNull final Context context, @NonNull final ArrayList<Playlist> playlists) {
+    public static void deletePlaylists(@NonNull final Context context, @NonNull final List<Playlist> playlists) {
         final StringBuilder selection = new StringBuilder();
         selection.append(MediaStore.Audio.Playlists._ID + " IN (");
         for (int i = 0; i < playlists.size(); i++) {
@@ -132,31 +100,62 @@ public class PlaylistsUtil {
         }
     }
 
-    static boolean doPlaylistContains(@NonNull final Context context, final long playlistId,
+    public static void addToPlaylist(@NonNull final Context context, final Song song, final int playlistId, final boolean showToastOnFinish) {
-                                      final int songId) {
+        List<Song> helperList = new ArrayList<>();
-        if (playlistId != -1) {
+        helperList.add(song);
-            try {
+        addToPlaylist(context, helperList, playlistId, showToastOnFinish);
-                Cursor c = context.getContentResolver().query(
-                        MediaStore.Audio.Playlists.Members.getContentUri("external", playlistId),
-                        new String[]{MediaStore.Audio.Playlists.Members.AUDIO_ID},
-                        MediaStore.Audio.Playlists.Members.AUDIO_ID + "=?", new String[]{String.valueOf(songId)},
-                        null);
-                int count = 0;
-                if (c != null) {
-                    count = c.getCount();
-                    c.close();
-                }
-                return count > 0;
-            } catch (SecurityException ignored) {
-            }
-        }
-        return false;
     }
 
-    public static boolean doesPlaylistExist(@NonNull final Context context, final int playlistId) {
+    public static void addToPlaylist(@NonNull final Context context, @NonNull final List<Song> songs, final int playlistId, final boolean showToastOnFinish) {
-        return playlistId != -1 && doesPlaylistExist(context,
+        final int size = songs.size();
-                MediaStore.Audio.Playlists._ID + "=?",
+        final ContentResolver resolver = context.getContentResolver();
-                new String[]{String.valueOf(playlistId)});
+        final String[] projection = new String[]{
+                "max(" + MediaStore.Audio.Playlists.Members.PLAY_ORDER + ")",
+        };
+        final Uri uri = MediaStore.Audio.Playlists.Members.getContentUri("external", playlistId);
+        Cursor cursor = null;
+        int base = 0;
+
+        try {
+            try {
+                cursor = resolver.query(uri, projection, null, null, null);
+
+                if (cursor != null && cursor.moveToFirst()) {
+                    base = cursor.getInt(0) + 1;
+                }
+            } finally {
+                if (cursor != null) {
+                    cursor.close();
+                }
+            }
+
+            int numInserted = 0;
+            for (int offSet = 0; offSet < size; offSet += 1000)
+                numInserted += resolver.bulkInsert(uri, makeInsertItems(songs, offSet, 1000, base));
+
+            if (showToastOnFinish) {
+                Toast.makeText(context, context.getResources().getString(
+                        R.string.inserted_x_songs_into_playlist_x, numInserted, getNameForPlaylist(context, playlistId)), Toast.LENGTH_SHORT).show();
+            }
+        } catch (SecurityException ignored) {
+            ignored.printStackTrace();
+        }
+    }
+
+    @NonNull
+    public static ContentValues[] makeInsertItems(@NonNull final List<Song> songs, final int offset, int len, final int base) {
+        if (offset + len > songs.size()) {
+            len = songs.size() - offset;
+        }
+
+        ContentValues[] contentValues = new ContentValues[len];
+
+        for (int i = 0; i < len; i++) {
+            contentValues[i] = new ContentValues();
+            contentValues[i].put(MediaStore.Audio.Playlists.Members.PLAY_ORDER, base + offset + i);
+            contentValues[i].put(MediaStore.Audio.Playlists.Members.AUDIO_ID, songs.get(offset + i).getId());
+        }
+        return contentValues;
     }
 
     public static String getNameForPlaylist(@NonNull final Context context, final long id) {
@@ -180,28 +179,6 @@ public class PlaylistsUtil {
         return "";
     }
 
-    @NonNull
-    public static ContentValues[] makeInsertItems(@NonNull final List<Song> songs, final int offset, int len,
-                                                  final int base) {
-        if (offset + len > songs.size()) {
-            len = songs.size() - offset;
-        }
-
-        ContentValues[] contentValues = new ContentValues[len];
-
-        for (int i = 0; i < len; i++) {
-            contentValues[i] = new ContentValues();
-            contentValues[i].put(MediaStore.Audio.Playlists.Members.PLAY_ORDER, base + offset + i);
-            contentValues[i].put(MediaStore.Audio.Playlists.Members.AUDIO_ID, songs.get(offset + i).getId());
-        }
-        return contentValues;
-    }
-
-    public static boolean moveItem(@NonNull final Context context, int playlistId, int from, int to) {
-        return MediaStore.Audio.Playlists.Members.moveItem(context.getContentResolver(),
-                playlistId, from, to);
-    }
-
     public static void removeFromPlaylist(@NonNull final Context context, @NonNull final Song song, int playlistId) {
         Uri uri = MediaStore.Audio.Playlists.Members.getContentUri(
                 "external", playlistId);
@@ -224,9 +201,7 @@ public class PlaylistsUtil {
         }
         String selection = MediaStore.Audio.Playlists.Members._ID + " in (";
         //noinspection unused
-        for (String selectionArg : selectionArgs) {
+        for (String selectionArg : selectionArgs) selection += "?, ";
-            selection += "?, ";
-        }
         selection = selection.substring(0, selection.length() - 2) + ")";
 
         try {
@@ -235,6 +210,29 @@ public class PlaylistsUtil {
         }
     }
 
+    public static boolean doPlaylistContains(@NonNull final Context context, final long playlistId, final int songId) {
+        if (playlistId != -1) {
+            try {
+                Cursor c = context.getContentResolver().query(
+                        MediaStore.Audio.Playlists.Members.getContentUri("external", playlistId),
+                        new String[]{MediaStore.Audio.Playlists.Members.AUDIO_ID}, MediaStore.Audio.Playlists.Members.AUDIO_ID + "=?", new String[]{String.valueOf(songId)}, null);
+                int count = 0;
+                if (c != null) {
+                    count = c.getCount();
+                    c.close();
+                }
+                return count > 0;
+            } catch (SecurityException ignored) {
+            }
+        }
+        return false;
+    }
+
+    public static boolean moveItem(@NonNull final Context context, int playlistId, int from, int to) {
+        return MediaStore.Audio.Playlists.Members.moveItem(context.getContentResolver(),
+                playlistId, from, to);
+    }
+
     public static void renamePlaylist(@NonNull final Context context, final long id, final String newName) {
         ContentValues contentValues = new ContentValues();
         contentValues.put(MediaStore.Audio.PlaylistsColumns.NAME, newName);
@@ -243,27 +241,28 @@ public class PlaylistsUtil {
                     contentValues,
                     MediaStore.Audio.Playlists._ID + "=?",
                     new String[]{String.valueOf(id)});
+            context.getContentResolver().notifyChange(Uri.parse("content://media"), null);
         } catch (SecurityException ignored) {
         }
     }
 
-    @Nullable
+    public static File savePlaylist(Context context, Playlist playlist) throws IOException {
-    public static File savePlaylist(@NonNull Context context,
-                                    @NonNull Playlist playlist) throws IOException {
         return M3UWriter.write(context, new File(Environment.getExternalStorageDirectory(), "Playlists"), playlist);
     }
 
-    static void addToPlaylist(@NonNull Context context,
+    public static boolean doesPlaylistExist(@NonNull final Context context, final int playlistId) {
-                              @NonNull Song song,
+        return playlistId != -1 && doesPlaylistExist(context,
-                              int playlistId,
+                MediaStore.Audio.Playlists._ID + "=?",
-                              boolean showToastOnFinish) {
+                new String[]{String.valueOf(playlistId)});
-        List<Song> helperList = new ArrayList<>();
-        helperList.add(song);
-        addToPlaylist(context, helperList, playlistId, showToastOnFinish);
     }
 
-    private static boolean doesPlaylistExist(@NonNull Context context, @NonNull final String selection,
+    public static boolean doesPlaylistExist(@NonNull final Context context, final String name) {
-                                             @NonNull final String[] values) {
+        return doesPlaylistExist(context,
+                MediaStore.Audio.PlaylistsColumns.NAME + "=?",
+                new String[]{name});
+    }
+
+    private static boolean doesPlaylistExist(@NonNull Context context, @NonNull final String selection, @NonNull final String[] values) {
         Cursor cursor = context.getContentResolver().query(EXTERNAL_CONTENT_URI,
                 new String[]{}, selection, values, null);
 

app/src/main/java/code/name/monkey/retromusic/util/PreferenceUtil.kt

@@ -23,18 +23,18 @@ import com.google.gson.JsonSyntaxException
 import com.google.gson.reflect.TypeToken
 import java.io.File
 
-object PreferenceUtilKT {
+object PreferenceUtil {
     private val sharedPreferences = PreferenceManager.getDefaultSharedPreferences(App.getContext())
 
     val defaultCategories = listOf(
-        CategoryInfo(CategoryInfo.Category.HOME, true),
+        CategoryInfo(CategoryInfo.Category.Home, true),
-        CategoryInfo(CategoryInfo.Category.SONGS, true),
+        CategoryInfo(CategoryInfo.Category.Songs, true),
-        CategoryInfo(CategoryInfo.Category.ALBUMS, true),
+        CategoryInfo(CategoryInfo.Category.Albums, true),
-        CategoryInfo(CategoryInfo.Category.ARTISTS, true),
+        CategoryInfo(CategoryInfo.Category.Artists, true),
-        CategoryInfo(CategoryInfo.Category.PLAYLISTS, true),
+        CategoryInfo(CategoryInfo.Category.Playlists, true),
-        CategoryInfo(CategoryInfo.Category.GENRES, false),
+        CategoryInfo(CategoryInfo.Category.Genres, false),
-        CategoryInfo(CategoryInfo.Category.QUEUE, false),
+        CategoryInfo(CategoryInfo.Category.Queue, false),
-        CategoryInfo(CategoryInfo.Category.FOLDER, false)
+        CategoryInfo(CategoryInfo.Category.Folder, false)
     )
 
     var libraryCategory: List<CategoryInfo>
@@ -484,7 +484,7 @@ object PreferenceUtilKT {
                     return albumCoverStyle
                 }
             }
-            return AlbumCoverStyle.CARD
+            return AlbumCoverStyle.Card
         }
         set(value) = sharedPreferences.edit { putInt(ALBUM_COVER_STYLE, value.id) }
 

app/src/main/java/code/name/monkey/retromusic/util/RetroUtil.java

@@ -142,7 +142,7 @@ public class RetroUtil {
     }
 
     public static boolean isAllowedToDownloadMetadata(final @NonNull Context context) {
-        switch (PreferenceUtilKT.INSTANCE.getAutoDownloadImagesPolicy()) {
+        switch (PreferenceUtil.INSTANCE.getAutoDownloadImagesPolicy()) {
             case "always":
                 return true;
             case "only_wifi":

app/src/main/java/code/name/monkey/retromusic/util/SAFUtil.java

@@ -119,19 +119,19 @@ public class SAFUtil {
     public static void saveTreeUri(Context context, Intent data) {
         Uri uri = data.getData();
         context.getContentResolver().takePersistableUriPermission(uri, Intent.FLAG_GRANT_WRITE_URI_PERMISSION | Intent.FLAG_GRANT_READ_URI_PERMISSION);
-        PreferenceUtilKT.INSTANCE.setSafSdCardUri(uri.toString());
+        PreferenceUtil.INSTANCE.setSafSdCardUri(uri.toString());
     }
 
     @TargetApi(Build.VERSION_CODES.LOLLIPOP)
     public static boolean isTreeUriSaved(Context context) {
-        return !TextUtils.isEmpty(PreferenceUtilKT.INSTANCE.getSafSdCardUri());
+        return !TextUtils.isEmpty(PreferenceUtil.INSTANCE.getSafSdCardUri());
     }
 
     @TargetApi(Build.VERSION_CODES.LOLLIPOP)
     public static boolean isSDCardAccessGranted(Context context) {
         if (!isTreeUriSaved(context)) return false;
 
-        String sdcardUri = PreferenceUtilKT.INSTANCE.getSafSdCardUri();
+        String sdcardUri = PreferenceUtil.INSTANCE.getSafSdCardUri();
 
         List<UriPermission> perms = context.getContentResolver().getPersistedUriPermissions();
         for (UriPermission perm : perms) {
@@ -198,7 +198,7 @@ public class SAFUtil {
 
         if (isTreeUriSaved(context)) {
             List<String> pathSegments = new ArrayList<>(Arrays.asList(audio.getFile().getAbsolutePath().split("/")));
-            Uri sdcard = Uri.parse(PreferenceUtilKT.INSTANCE.getSafSdCardUri());
+            Uri sdcard = Uri.parse(PreferenceUtil.INSTANCE.getSafSdCardUri());
             uri = findDocument(DocumentFile.fromTreeUri(context, sdcard), pathSegments);
         }
 
@@ -271,7 +271,7 @@ public class SAFUtil {
 
         if (isTreeUriSaved(context)) {
             List<String> pathSegments = new ArrayList<>(Arrays.asList(path.split("/")));
-            Uri sdcard = Uri.parse(PreferenceUtilKT.INSTANCE.getSafSdCardUri());
+            Uri sdcard = Uri.parse(PreferenceUtil.INSTANCE.getSafSdCardUri());
             uri = findDocument(DocumentFile.fromTreeUri(context, sdcard), pathSegments);
         }
 

app/src/main/java/code/name/monkey/retromusic/views/BottomNavigationBarTinted.kt

@@ -25,7 +25,7 @@ import code.name.monkey.appthemehelper.util.ATHUtil
 import code.name.monkey.appthemehelper.util.ColorUtil
 import code.name.monkey.appthemehelper.util.NavigationViewUtil
 import code.name.monkey.retromusic.R
-import code.name.monkey.retromusic.util.PreferenceUtilKT
+import code.name.monkey.retromusic.util.PreferenceUtil
 import code.name.monkey.retromusic.util.RippleUtils
 import com.google.android.material.bottomnavigation.BottomNavigationView
 
@@ -36,7 +36,7 @@ class BottomNavigationBarTinted @JvmOverloads constructor(
 ) : BottomNavigationView(context, attrs, defStyleAttr) {
 
     init {
-        labelVisibilityMode = PreferenceUtilKT.tabTitleMode
+        labelVisibilityMode = PreferenceUtil.tabTitleMode
 
         val iconColor = ATHUtil.resolveColor(context, android.R.attr.colorControlNormal)
         val accentColor = ThemeStore.accentColor(context)