Replaced AsyncTasks of Folders tab with coroutines

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

@@ -13,12 +13,10 @@
  */
 package code.name.monkey.retromusic.fragments.folder
 
-import android.app.Dialog
 import android.content.Context
 import android.media.MediaScannerConnection
 import android.os.Bundle
 import android.os.Environment
-import android.text.Html
 import android.view.Menu
 import android.view.MenuInflater
 import android.view.MenuItem
@@ -26,7 +24,9 @@ import android.view.View
 import android.webkit.MimeTypeMap
 import androidx.activity.OnBackPressedCallback
 import androidx.appcompat.widget.PopupMenu
+import androidx.core.text.parseAsHtml
 import androidx.core.view.isVisible
+import androidx.lifecycle.lifecycleScope
 import androidx.loader.app.LoaderManager
 import androidx.loader.content.Loader
 import androidx.navigation.fragment.findNavController
@@ -35,7 +35,6 @@ import androidx.recyclerview.widget.RecyclerView
 import code.name.monkey.appthemehelper.ThemeStore.Companion.accentColor
 import code.name.monkey.appthemehelper.common.ATHToolbarActivity
 import code.name.monkey.appthemehelper.util.ToolbarContentTintHelper
-import code.name.monkey.retromusic.App
 import code.name.monkey.retromusic.R
 import code.name.monkey.retromusic.adapter.SongFileAdapter
 import code.name.monkey.retromusic.adapter.Storage
@@ -44,17 +43,13 @@ import code.name.monkey.retromusic.adapter.StorageClickListener
 import code.name.monkey.retromusic.databinding.FragmentFolderBinding
 import code.name.monkey.retromusic.extensions.*
 import code.name.monkey.retromusic.fragments.base.AbsMainActivityFragment
-import code.name.monkey.retromusic.fragments.folder.FoldersFragment.ListPathsAsyncTask.OnPathsListedCallback
-import code.name.monkey.retromusic.fragments.folder.FoldersFragment.ListSongsAsyncTask.OnSongsListedCallback
 import code.name.monkey.retromusic.helper.MusicPlayerRemote.openQueue
 import code.name.monkey.retromusic.helper.MusicPlayerRemote.playingQueue
-import code.name.monkey.retromusic.helper.menu.SongMenuHelper.handleMenuClick
 import code.name.monkey.retromusic.helper.menu.SongsMenuHelper
 import code.name.monkey.retromusic.interfaces.ICabCallback
 import code.name.monkey.retromusic.interfaces.ICabHolder
 import code.name.monkey.retromusic.interfaces.ICallbacks
 import code.name.monkey.retromusic.interfaces.IMainActivityFragmentCallbacks
-import code.name.monkey.retromusic.misc.DialogAsyncTask
 import code.name.monkey.retromusic.misc.UpdateToastMediaScannerCompletionListener
 import code.name.monkey.retromusic.misc.WrappedAsyncTaskLoader
 import code.name.monkey.retromusic.model.Song
@@ -69,10 +64,12 @@ import com.afollestad.materialcab.attached.AttachedCab
 import com.afollestad.materialcab.attached.destroy
 import com.afollestad.materialcab.attached.isActive
 import com.afollestad.materialcab.createCab
-import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import com.google.android.material.shape.MaterialShapeDrawable
 import com.google.android.material.snackbar.Snackbar
 import com.google.android.material.transition.MaterialFadeThrough
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 import java.io.File
 import java.io.FileFilter
 import java.io.IOException
@@ -101,6 +98,7 @@ class FoldersFragment : AbsMainActivityFragment(R.layout.fragment_folder),
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         _binding = FragmentFolderBinding.bind(view)
 
+        setHasOptionsMenu(true)
         mainActivity.addMusicServiceEventListener(libraryViewModel)
         mainActivity.setSupportActionBar(binding.toolbar)
         mainActivity.supportActionBar?.title = null
@@ -185,23 +183,20 @@ class FoldersFragment : AbsMainActivityFragment(R.layout.fragment_folder),
             popupMenu.setOnMenuItemClickListener { item: MenuItem ->
                 when (val itemId = item.itemId) {
                     R.id.action_play_next, R.id.action_add_to_current_playing, R.id.action_add_to_playlist, R.id.action_delete_from_device -> {
-                        ListSongsAsyncTask(
+                        lifecycleScope.launch(Dispatchers.IO) {
-                            activity,
+                            listSongs(
-                            null,
+                                requireContext(),
-                            object : OnSongsListedCallback {
+                                toList(file),
-                                override fun onSongsListed(songs: List<Song>, extra: Any?) {
+                                AUDIO_FILE_FILTER,
+                                fileComparator
+                            ) { songs ->
                                 if (songs.isNotEmpty()) {
                                     SongsMenuHelper.handleMenuClick(
                                         requireActivity(), songs, itemId
                                     )
                                 }
                             }
-                            })
+                        }
-                            .execute(
-                                ListSongsAsyncTask.LoadingInfo(
-                                    toList(file), AUDIO_FILE_FILTER, fileComparator
-                                )
-                            )
                         return@setOnMenuItemClickListener true
                     }
                     R.id.action_add_to_blacklist -> {
@@ -216,14 +211,9 @@ class FoldersFragment : AbsMainActivityFragment(R.layout.fragment_folder),
                         return@setOnMenuItemClickListener true
                     }
                     R.id.action_scan -> {
-                        ListPathsAsyncTask(
+                        lifecycleScope.launch {
-                            activity,
+                            listPaths(file, AUDIO_FILE_FILTER) { paths -> scanPaths(paths) }
-                            object : OnPathsListedCallback {
-                                override fun onPathsListed(paths: Array<String?>) {
-                                    scanPaths(paths)
                         }
-                            })
-                            .execute(ListPathsAsyncTask.LoadingInfo(file, AUDIO_FILE_FILTER))
                         return@setOnMenuItemClickListener true
                     }
                 }
@@ -234,32 +224,26 @@ class FoldersFragment : AbsMainActivityFragment(R.layout.fragment_folder),
             popupMenu.setOnMenuItemClickListener { item: MenuItem ->
                 when (val itemId = item.itemId) {
                     R.id.action_play_next, R.id.action_add_to_current_playing, R.id.action_add_to_playlist, R.id.action_go_to_album, R.id.action_go_to_artist, R.id.action_share, R.id.action_tag_editor, R.id.action_details, R.id.action_set_as_ringtone, R.id.action_delete_from_device -> {
-                        ListSongsAsyncTask(
+                        lifecycleScope.launch(Dispatchers.IO) {
-                            activity,
+                            listSongs(
-                            null,
+                                requireContext(),
-                            object : OnSongsListedCallback {
+                                toList(file),
-                                override fun onSongsListed(songs: List<Song>, extra: Any?) {
+                                AUDIO_FILE_FILTER,
-                                    handleMenuClick(
+                                fileComparator
-                                        requireActivity(), songs[0], itemId
+                            ) { songs ->
+                                if (songs.isNotEmpty()) {
+                                    SongsMenuHelper.handleMenuClick(
+                                        requireActivity(), songs, itemId
                                     )
                                 }
-                            })
+                            }
-                            .execute(
+                        }
-                                ListSongsAsyncTask.LoadingInfo(
-                                    toList(file), AUDIO_FILE_FILTER, fileComparator
-                                )
-                            )
                         return@setOnMenuItemClickListener true
                     }
                     R.id.action_scan -> {
-                        ListPathsAsyncTask(
+                        lifecycleScope.launch {
-                            activity,
+                            listPaths(file, AUDIO_FILE_FILTER) { paths -> scanPaths(paths) }
-                            object : OnPathsListedCallback {
-                                override fun onPathsListed(paths: Array<String?>) {
-                                    scanPaths(paths)
                         }
-                            })
-                            .execute(ListPathsAsyncTask.LoadingInfo(file, AUDIO_FILE_FILTER))
                         return@setOnMenuItemClickListener true
                     }
                 }
@@ -278,16 +262,17 @@ class FoldersFragment : AbsMainActivityFragment(R.layout.fragment_folder),
             val fileFilter = FileFilter { pathname: File ->
                 !pathname.isDirectory && AUDIO_FILE_FILTER.accept(pathname)
             }
-            ListSongsAsyncTask(
+            lifecycleScope.launch(Dispatchers.IO) {
-                activity,
+                listSongs(
-                mFile,
+                    requireContext(),
-                object : OnSongsListedCallback {
+                    toList(mFile.parentFile),
-                    override fun onSongsListed(songs: List<Song>, extra: Any?) {
+                    fileFilter,
-                        val file1 = extra as File
+                    fileComparator
+                ) { songs ->
+                    if (songs.isNotEmpty()) {
                         var startIndex = -1
                         for (i in songs.indices) {
-                            if (file1
+                            if (mFile.path
-                                    .path
                                 == songs[i].data
                             ) { // path is already canonical here
                                 startIndex = i
@@ -299,39 +284,29 @@ class FoldersFragment : AbsMainActivityFragment(R.layout.fragment_folder),
                         } else {
                             Snackbar.make(
                                 mainActivity.slidingPanel,
-                                Html.fromHtml(
                                 String.format(
-                                        getString(R.string.not_listed_in_media_store), file1.name
+                                    getString(R.string.not_listed_in_media_store), mFile.name
-                                    )
+
-                                ),
+                                ).parseAsHtml(),
                                 Snackbar.LENGTH_LONG
                             )
                                 .setAction(
                                     R.string.action_scan
                                 ) {
-                                    ListPathsAsyncTask(
+                                    lifecycleScope.launch {
-                                        requireActivity(),
+                                        listPaths(mFile, AUDIO_FILE_FILTER) { paths ->
-                                        object : OnPathsListedCallback {
+                                            scanPaths(
-                                            override fun onPathsListed(paths: Array<String?>) {
+                                                paths
-                                                scanPaths(paths)
+                                            )
+                                        }
                                     }
-                                        })
-                                        .execute(
-                                            ListPathsAsyncTask.LoadingInfo(
-                                                file1, AUDIO_FILE_FILTER
-                                            )
-                                        )
                                 }
                                 .setActionTextColor(accentColor(requireActivity()))
                                 .show()
                         }
                     }
-                })
+                }
-                .execute(
+            }
-                    ListSongsAsyncTask.LoadingInfo(
-                        toList(mFile.parentFile), fileFilter, fileComparator
-                    )
-                )
         }
     }
 
@@ -345,19 +320,16 @@ class FoldersFragment : AbsMainActivityFragment(R.layout.fragment_folder),
 
     override fun onMultipleItemAction(item: MenuItem, files: ArrayList<File>) {
         val itemId = item.itemId
-        ListSongsAsyncTask(
+
-            activity,
+        lifecycleScope.launch(Dispatchers.IO) {
-            null,
+            listSongs(requireContext(), files, AUDIO_FILE_FILTER, fileComparator) { songs ->
-            object : OnSongsListedCallback {
+                if (songs.isNotEmpty()) {
-                override fun onSongsListed(songs: List<Song>, extra: Any?) {
                     SongsMenuHelper.handleMenuClick(
-                        requireActivity(),
+                        requireActivity(), songs, itemId
-                        songs,
-                        itemId
                     )
                 }
-            })
+            }
-            .execute(ListSongsAsyncTask.LoadingInfo(files, AUDIO_FILE_FILTER, fileComparator))
+        }
     }
 
     override fun onPrepareOptionsMenu(menu: Menu) {
@@ -397,14 +369,9 @@ class FoldersFragment : AbsMainActivityFragment(R.layout.fragment_folder),
             R.id.action_scan -> {
                 val crumb = activeCrumb
                 if (crumb != null) {
-                    ListPathsAsyncTask(
+                    lifecycleScope.launch {
-                        activity,
+                        listPaths(crumb.file, AUDIO_FILE_FILTER) { paths -> scanPaths(paths) }
-                        object : OnPathsListedCallback {
-                            override fun onPathsListed(paths: Array<String?>) {
-                                scanPaths(paths)
                     }
-                        })
-                        .execute(ListPathsAsyncTask.LoadingInfo(crumb.file, AUDIO_FILE_FILTER))
                 }
                 return true
             }
@@ -557,69 +524,32 @@ class FoldersFragment : AbsMainActivityFragment(R.layout.fragment_folder),
         _binding = null
     }
 
-    class ListPathsAsyncTask(context: Context?, callback: OnPathsListedCallback) :
+    private suspend fun listPaths(
-        ListingFilesDialogAsyncTask<ListPathsAsyncTask.LoadingInfo, String?, Array<String?>>(
+        file: File,
-            context
+        fileFilter: FileFilter,
+        doOnPathListed: (paths: Array<String?>) -> Unit
     ) {
-        private val onPathsListedCallbackWeakReference: WeakReference<OnPathsListedCallback> =
+        val paths = try {
-            WeakReference(callback)
-
-        override fun doInBackground(vararg params: LoadingInfo): Array<String?> {
-            return try {
-                if (isCancelled || checkCallbackReference() == null) {
-                    return arrayOf()
-                }
-                val info = params[0]
             val paths: Array<String?>
-                if (info.file.isDirectory) {
+            if (file.isDirectory) {
-                    val files = FileUtil.listFilesDeep(info.file, info.fileFilter)
+                val files = FileUtil.listFilesDeep(file, fileFilter)
-                    if (isCancelled || checkCallbackReference() == null) {
-                        return arrayOf()
-                    }
                 paths = arrayOfNulls(files.size)
                 for (i in files.indices) {
                     val f = files[i]
                     paths[i] = FileUtil.safeGetCanonicalPath(f)
-                        if (isCancelled || checkCallbackReference() == null) {
-                            return arrayOf()
-                        }
                 }
             } else {
                 paths = arrayOfNulls(1)
-                    paths[0] = info.file.path
+                paths[0] = file.path
             }
             paths
         } catch (e: Exception) {
             e.printStackTrace()
-                cancel(false)
             arrayOf()
         }
+        withContext(Dispatchers.Main) {
+            doOnPathListed(paths)
         }
-
-        override fun onPostExecute(paths: Array<String?>) {
-            super.onPostExecute(paths)
-            checkCallbackReference()?.onPathsListed(paths)
-        }
-
-        override fun onPreExecute() {
-            super.onPreExecute()
-            checkCallbackReference()
-        }
-
-        private fun checkCallbackReference(): OnPathsListedCallback? {
-            val callback = onPathsListedCallbackWeakReference.get()
-            if (callback == null) {
-                cancel(false)
-            }
-            return callback
-        }
-
-        interface OnPathsListedCallback {
-            fun onPathsListed(paths: Array<String?>)
-        }
-
-        class LoadingInfo(val file: File, val fileFilter: FileFilter)
-
     }
 
     private class AsyncFileLoader(foldersFragment: FoldersFragment) :
@@ -647,87 +577,25 @@ class FoldersFragment : AbsMainActivityFragment(R.layout.fragment_folder),
                 LinkedList()
             }
         }
-
     }
 
-    private open class ListSongsAsyncTask(
+    suspend fun listSongs(
-        context: Context?,
+        context: Context,
-        private val extra: Any?,
+        files: List<File>,
-        callback: OnSongsListedCallback
+        fileFilter: FileFilter,
-    ) : ListingFilesDialogAsyncTask<ListSongsAsyncTask.LoadingInfo, Void, List<Song>>(context) {
+        fileComparator: Comparator<File>,
-        private val callbackWeakReference = WeakReference(callback)
+        doOnSongsListed: (songs: List<Song>) -> Unit
-        private val contextWeakReference = WeakReference(context)
+    ) {
-        override fun doInBackground(vararg params: LoadingInfo): List<Song> {
+        val songs = try {
-            return try {
+            val fileList = FileUtil.listFilesDeep(files, fileFilter)
-                val info = params[0]
+            Collections.sort(fileList, fileComparator)
-                val files = FileUtil.listFilesDeep(info.files, info.fileFilter)
+            FileUtil.matchFilesWithMediaStore(context, fileList)
-                if (isCancelled || checkContextReference() == null || checkCallbackReference() == null) {
-                    return emptyList()
-                }
-                Collections.sort(files, info.fileComparator)
-                val context = checkContextReference()
-                if (isCancelled || context == null || checkCallbackReference() == null) {
-                    emptyList()
-                } else FileUtil.matchFilesWithMediaStore(context, files)
         } catch (e: Exception) {
             e.printStackTrace()
-                cancel(false)
             emptyList()
         }
-        }
+        withContext(Dispatchers.Main) {
-
+            doOnSongsListed(songs)
-        override fun onPostExecute(songs: List<Song>) {
-            super.onPostExecute(songs)
-            checkCallbackReference()?.onSongsListed(songs, extra)
-        }
-
-        override fun onPreExecute() {
-            super.onPreExecute()
-            checkCallbackReference()
-            checkContextReference()
-        }
-
-        private fun checkCallbackReference(): OnSongsListedCallback? {
-            val callback = callbackWeakReference.get()
-            if (callback == null) {
-                cancel(false)
-            }
-            return callback
-        }
-
-        private fun checkContextReference(): Context? {
-            val context = contextWeakReference.get()
-            if (context == null) {
-                cancel(false)
-            }
-            return context
-        }
-
-        interface OnSongsListedCallback {
-            fun onSongsListed(songs: List<Song>, extra: Any?)
-        }
-
-        class LoadingInfo(
-            val files: List<File>,
-            val fileFilter: FileFilter,
-            val fileComparator: Comparator<File>
-        )
-
-    }
-
-    abstract class ListingFilesDialogAsyncTask<Params, Progress, Result> internal constructor(
-        context: Context?
-    ) :
-        DialogAsyncTask<Params, Progress, Result>(context) {
-
-        override fun createDialog(context: Context): Dialog {
-            return MaterialAlertDialogBuilder(context)
-                .setTitle(R.string.listing_files)
-                .setCancelable(false)
-                .setView(R.layout.loading)
-                .setOnCancelListener { cancel(false) }
-                .setOnDismissListener { cancel(false) }
-                .create()
         }
     }
 
@@ -768,7 +636,11 @@ class FoldersFragment : AbsMainActivityFragment(R.layout.fragment_folder),
             (!file.isHidden
                     && (file.isDirectory
                     || FileUtil.fileIsMimeType(file, "audio/*", MimeTypeMap.getSingleton())
-                    || FileUtil.fileIsMimeType(file, "application/opus", MimeTypeMap.getSingleton())
+                    || FileUtil.fileIsMimeType(
+                file,
+                "application/opus",
+                MimeTypeMap.getSingleton()
+            )
                     || FileUtil.fileIsMimeType(
                 file,
                 "application/ogg",