Added proper transitions

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

@@ -103,6 +103,9 @@ class MainActivity : AbsCastActivity(), OnSharedPreferenceChangeListener {
                 }
         }
         navController.addOnDestinationChangedListener { _, destination, _ ->
+            // This is more like a work-around as for start destination of navGraph
+            // enterTransition won't work as expected
+            navGraph.setStartDestination(R.id.libraryFragment)
             when (destination.id) {
                 R.id.action_home, R.id.action_song, R.id.action_album, R.id.action_artist, R.id.action_folder, R.id.action_playlist, R.id.action_genre -> {
                     // Save the last tab
@@ -128,6 +131,16 @@ class MainActivity : AbsCastActivity(), OnSharedPreferenceChangeListener {
     override fun onSupportNavigateUp(): Boolean =
         findNavController(R.id.fragment_container).navigateUp()
 
+    override fun onBackPressed() {
+        val bottomTabs = listOf(R.id.action_home, R.id.action_song, R.id.action_album, R.id.action_artist, R.id.action_folder, R.id.action_playlist, R.id.action_genre)
+        val currentDestinationId = findNavController(R.id.fragment_container).currentDestination?.id
+        if (bottomTabs.contains(currentDestinationId)) {
+            finish()
+        } else {
+            findNavController(R.id.fragment_container).navigateUp()
+        }
+    }
+
     override fun onResume() {
         super.onResume()
         PreferenceUtil.registerOnSharedPreferenceChangedListener(this)

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

@@ -227,5 +227,12 @@ fun Context.getColorCompat(@ColorRes colorRes: Int): Int {
 
 @ColorInt
 fun Context.darkAccentColor(): Int {
-    return ColorUtils.blendARGB(accentColor(), surfaceColor(), 0.975f)
+    return ColorUtils.blendARGB(
+        accentColor(),
+        surfaceColor(),
+        if (surfaceColor().isColorLight) 0.96f else 0.975f
+    )
 }
+
+inline val @receiver:ColorInt Int.isColorLight
+    get() = ColorUtil.isColorLight(this)

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

@@ -37,6 +37,7 @@ import code.name.monkey.retromusic.extensions.drawNextToNavbar
 import code.name.monkey.retromusic.helper.MusicPlayerRemote
 import code.name.monkey.retromusic.util.ThemedFastScroller.create
 import com.google.android.material.shape.MaterialShapeDrawable
+import com.google.android.material.transition.MaterialFadeThrough
 import com.google.android.material.transition.MaterialSharedAxis
 import me.zhanghai.android.fastscroll.FastScroller
 import me.zhanghai.android.fastscroll.FastScrollerBuilder
@@ -56,6 +57,9 @@ abstract class AbsRecyclerViewFragment<A : RecyclerView.Adapter<*>, LM : Recycle
         _binding = FragmentMainRecyclerBinding.bind(view)
         postponeEnterTransition()
         view.doOnPreDraw { startPostponedEnterTransition() }
+        enterTransition = MaterialFadeThrough().apply {
+            addTarget(binding.recyclerView)
+        }
         mainActivity.setSupportActionBar(binding.toolbar)
         mainActivity.supportActionBar?.title = null
         initLayoutManager()

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

@@ -72,6 +72,7 @@ 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 com.google.android.material.transition.MaterialSharedAxis
 import java.io.*
 import java.lang.ref.WeakReference
@@ -106,6 +107,9 @@ class FoldersFragment : AbsMainActivityFragment(R.layout.fragment_folder),
         mainActivity.addMusicServiceEventListener(libraryViewModel)
         mainActivity.setSupportActionBar(binding.toolbar)
         mainActivity.supportActionBar?.title = null
+        enterTransition = MaterialFadeThrough().apply {
+            addTarget(binding.recyclerView)
+        }
         setUpBreadCrumbs()
         setUpRecyclerView()
         setUpAdapter()

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

@@ -42,6 +42,7 @@ import code.name.monkey.retromusic.glide.RetroGlideExtension
 import code.name.monkey.retromusic.util.PreferenceUtil
 import com.google.android.gms.cast.framework.CastButtonFactory
 import com.google.android.material.shape.MaterialShapeDrawable
+import com.google.android.material.transition.MaterialFadeThrough
 import com.google.android.material.transition.MaterialSharedAxis
 
 class HomeFragment :
@@ -58,6 +59,10 @@ class HomeFragment :
         setupListeners()
         binding.titleWelcome.text = String.format("%s", PreferenceUtil.userName)
 
+        enterTransition = MaterialFadeThrough().apply {
+            addTarget(binding.contentContainer)
+        }
+
         val homeAdapter = HomeAdapter(mainActivity)
         binding.recyclerView.apply {
             layoutManager = LinearLayoutManager(mainActivity)

app/src/main/res/animator/nav_default_enter_anim.xml

@@ -1,30 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<set xmlns:android="http://schemas.android.com/apk/res/android">
-    <objectAnimator
-        android:duration="210"
-        android:interpolator="@android:anim/decelerate_interpolator"
-        android:propertyName="scaleX"
-        android:startOffset="90"
-        android:valueFrom="0.92"
-        android:valueTo="1.0" />
-    <objectAnimator
-        android:duration="210"
-        android:interpolator="@android:anim/decelerate_interpolator"
-        android:propertyName="scaleY"
-        android:startOffset="90"
-        android:valueFrom="0.92"
-        android:valueTo="1.0" />
-    <objectAnimator
-        android:duration="210"
-        android:interpolator="@android:anim/decelerate_interpolator"
-        android:propertyName="alpha"
-        android:startOffset="90"
-        android:valueFrom="0.0"
-        android:valueTo="1.0" />
-    <objectAnimator
-        android:duration="90"
-        android:propertyName="alpha"
-        android:startOffset="0"
-        android:valueFrom="0.0"
-        android:valueTo="0.0" />
-</set>

app/src/main/res/animator/nav_default_exit_anim.xml

@@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<set xmlns:android="http://schemas.android.com/apk/res/android">
-    <objectAnimator
-        android:duration="90"
-        android:interpolator="@android:anim/accelerate_interpolator"
-        android:propertyName="alpha"
-        android:valueFrom="1.0"
-        android:valueTo="0.0" />
-</set>

app/src/main/res/animator/nav_default_pop_enter_anim.xml

@@ -1,30 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<set xmlns:android="http://schemas.android.com/apk/res/android">
-    <objectAnimator
-        android:duration="210"
-        android:interpolator="@android:anim/decelerate_interpolator"
-        android:propertyName="scaleX"
-        android:startOffset="90"
-        android:valueFrom="0.92"
-        android:valueTo="1.0" />
-    <objectAnimator
-        android:duration="210"
-        android:interpolator="@android:anim/decelerate_interpolator"
-        android:propertyName="scaleY"
-        android:startOffset="90"
-        android:valueFrom="0.92"
-        android:valueTo="1.0" />
-    <objectAnimator
-        android:duration="210"
-        android:interpolator="@android:anim/decelerate_interpolator"
-        android:propertyName="alpha"
-        android:startOffset="90"
-        android:valueFrom="0.0"
-        android:valueTo="1.0" />
-    <objectAnimator
-        android:duration="90"
-        android:propertyName="alpha"
-        android:startOffset="0"
-        android:valueFrom="0.0"
-        android:valueTo="0.0" />
-</set>

app/src/main/res/animator/nav_default_pop_exit_anim.xml

@@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<set xmlns:android="http://schemas.android.com/apk/res/android">
-    <objectAnimator
-        android:duration="90"
-        android:interpolator="@android:anim/accelerate_interpolator"
-        android:propertyName="alpha"
-        android:valueFrom="1.0"
-        android:valueTo="0.0" />
-</set>

app/src/main/res/layout-land/fragment_banner_home.xml

@@ -16,8 +16,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:fitsSystemWindows="true"
+    android:fitsSystemWindows="true">
-    android:transitionGroup="true">
 
     <com.google.android.material.appbar.AppBarLayout
         android:id="@+id/appBarLayout"
@@ -72,7 +71,7 @@
             android:id="@+id/contentContainer"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:orientation="vertical">
+            android:transitionGroup="true">
 
             <com.google.android.material.card.MaterialCardView
                 android:id="@+id/imageContainer"

app/src/main/res/layout-land/fragment_home.xml

@@ -16,8 +16,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:fitsSystemWindows="true"
+    android:fitsSystemWindows="true">
-    android:transitionGroup="true">
 
     <com.google.android.material.appbar.AppBarLayout
         android:id="@+id/appBarLayout"
@@ -71,7 +70,8 @@
         <androidx.constraintlayout.widget.ConstraintLayout
             android:id="@+id/contentContainer"
             android:layout_width="match_parent"
-            android:layout_height="wrap_content">
+            android:layout_height="wrap_content"
+            android:transitionGroup="true">
 
             <code.name.monkey.retromusic.views.RetroShapeableImageView
                 android:id="@+id/userImage"

app/src/main/res/layout/fragment_banner_home.xml

@@ -16,8 +16,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:fitsSystemWindows="true"
+    android:fitsSystemWindows="true">
-    android:transitionGroup="true">
 
     <com.google.android.material.appbar.AppBarLayout
         android:id="@+id/appBarLayout"
@@ -69,7 +68,7 @@
             android:id="@+id/contentContainer"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:orientation="vertical">
+            android:transitionGroup="true">
 
             <com.google.android.material.card.MaterialCardView
                 android:id="@+id/imageContainer"

app/src/main/res/layout/fragment_home.xml

@@ -16,8 +16,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:fitsSystemWindows="true"
+    android:fitsSystemWindows="true">
-    android:transitionGroup="true">
 
     <com.google.android.material.appbar.AppBarLayout
         android:id="@+id/appBarLayout"
@@ -68,7 +67,8 @@
         <androidx.constraintlayout.widget.ConstraintLayout
             android:id="@+id/contentContainer"
             android:layout_width="match_parent"
-            android:layout_height="wrap_content">
+            android:layout_height="wrap_content"
+            android:transitionGroup="true">
 
             <code.name.monkey.retromusic.views.RetroShapeableImageView
                 android:id="@+id/userImage"

app/src/main/res/layout/fragment_main_recycler.xml

@@ -4,8 +4,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:fitsSystemWindows="true"
+    android:fitsSystemWindows="true">
-    android:transitionGroup="true">
 
     <com.google.android.material.appbar.AppBarLayout
         android:id="@+id/appBarLayout"
@@ -40,14 +39,15 @@
     </com.google.android.material.appbar.AppBarLayout>
 
     <androidx.recyclerview.widget.RecyclerView
-        android:id="@+id/recyclerView"
+        android:id="@+id/recycler_view"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:clipToPadding="false"
         android:overScrollMode="never"
         android:scrollbars="none"
         app:layout_behavior="com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior"
-        tools:listitem="@layout/item_list" />
+        tools:listitem="@layout/item_list"
+        android:transitionGroup="true"/>
 
     <LinearLayout
         android:id="@android:id/empty"