feat: added the ability to shuffle the playback queue

app/src/main/java/com/cappielloantonio/tempo/service/MediaManager.java

@@ -204,6 +204,22 @@ public class MediaManager {
         }
     }
 
+    public static void shuffle(ListenableFuture<MediaBrowser> mediaBrowserListenableFuture, List<Child> media, int startIndex, int endIndex) {
+        if (mediaBrowserListenableFuture != null) {
+            mediaBrowserListenableFuture.addListener(() -> {
+                try {
+                    if (mediaBrowserListenableFuture.isDone()) {
+                        mediaBrowserListenableFuture.get().removeMediaItems(startIndex, endIndex + 1);
+                        mediaBrowserListenableFuture.get().addMediaItems(MappingUtil.mapMediaItems(media).subList(startIndex, endIndex + 1));
+                        swapDatabase(media);
+                    }
+                } catch (ExecutionException | InterruptedException e) {
+                    e.printStackTrace();
+                }
+            }, MoreExecutors.directExecutor());
+        }
+    }
+
     public static void swap(ListenableFuture<MediaBrowser> mediaBrowserListenableFuture, List<Child> media, int from, int to) {
         if (mediaBrowserListenableFuture != null) {
             mediaBrowserListenableFuture.addListener(() -> {

app/src/main/java/com/cappielloantonio/tempo/ui/fragment/PlayerQueueFragment.java

@@ -25,12 +25,16 @@ import com.cappielloantonio.tempo.ui.adapter.PlayerSongQueueAdapter;
 import com.cappielloantonio.tempo.util.Constants;
 import com.cappielloantonio.tempo.viewmodel.PlayerBottomSheetViewModel;
 import com.google.common.util.concurrent.ListenableFuture;
+import com.google.common.util.concurrent.MoreExecutors;
 
+import java.util.ArrayList;
 import java.util.Collections;
 import java.util.stream.Collectors;
 
 @UnstableApi
 public class PlayerQueueFragment extends Fragment implements ClickCallback {
+    private static final String TAG = "PlayerQueueFragment";
+
     private InnerFragmentPlayerQueueBinding bind;
 
     private PlayerBottomSheetViewModel playerBottomSheetViewModel;
@@ -54,6 +58,7 @@ public class PlayerQueueFragment extends Fragment implements ClickCallback {
     public void onStart() {
         super.onStart();
         initializeBrowser();
+        bindMediaController();
     }
 
     @Override
@@ -83,6 +88,17 @@ public class PlayerQueueFragment extends Fragment implements ClickCallback {
         MediaBrowser.releaseFuture(mediaBrowserListenableFuture);
     }
 
+    private void bindMediaController() {
+        mediaBrowserListenableFuture.addListener(() -> {
+            try {
+                MediaBrowser mediaBrowser = mediaBrowserListenableFuture.get();
+                initShuffleButton(mediaBrowser);
+            } catch (Exception exception) {
+                exception.printStackTrace();
+            }
+        }, MoreExecutors.directExecutor());
+    }
+
     private void setMediaBrowserListenableFuture() {
         playerSongQueueAdapter.setMediaBrowserListenableFuture(mediaBrowserListenableFuture);
     }
@@ -151,6 +167,36 @@ public class PlayerQueueFragment extends Fragment implements ClickCallback {
         }).attachToRecyclerView(bind.playerQueueRecyclerView);
     }
 
+    private void initShuffleButton(MediaBrowser mediaBrowser) {
+        bind.playerShuffleQueueFab.setOnClickListener(view -> {
+            int startPosition = mediaBrowser.getCurrentMediaItemIndex() + 1;
+            int endPosition = playerSongQueueAdapter.getItems().size() - 1;
+
+            if (startPosition < endPosition) {
+                ArrayList<Integer> pool = new ArrayList<>();
+
+                for (int i = startPosition; i <= endPosition; i++) {
+                    pool.add(i);
+                }
+
+                while (pool.size() >= 2) {
+                    int fromPosition = (int) (Math.random() * (pool.size()));
+                    int positionA = pool.get(fromPosition);
+                    pool.remove(fromPosition);
+
+                    int toPosition = (int) (Math.random() * (pool.size()));
+                    int positionB = pool.get(toPosition);
+                    pool.remove(toPosition);
+
+                    Collections.swap(playerSongQueueAdapter.getItems(), positionA, positionB);
+                    bind.playerQueueRecyclerView.getAdapter().notifyItemMoved(positionA, positionB);
+                }
+
+                MediaManager.shuffle(mediaBrowserListenableFuture, playerSongQueueAdapter.getItems(), startPosition, endPosition);
+            }
+        });
+    }
+
     private void updateNowPlayingItem() {
         playerSongQueueAdapter.notifyDataSetChanged();
     }

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

@@ -1,14 +1,32 @@
-<com.cappielloantonio.tempo.helper.recyclerview.NestedScrollableHost xmlns:android="http://schemas.android.com/apk/res/android"
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.coordinatorlayout.widget.CoordinatorLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
-    <androidx.recyclerview.widget.RecyclerView
+    <com.cappielloantonio.tempo.helper.recyclerview.NestedScrollableHost
-        android:id="@+id/player_queue_recycler_view"
+        android:id="@+id/player_queue_nested_scrollable_recycler_view"
         android:layout_width="match_parent"
-        android:layout_height="match_parent"
+        android:layout_height="match_parent">
-        android:clipToPadding="false"
+
-        android:orientation="vertical"
+        <androidx.recyclerview.widget.RecyclerView
-        android:paddingTop="8dp"
+            android:id="@+id/player_queue_recycler_view"
-        android:paddingBottom="@dimen/global_padding_bottom" />
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"
+            android:clipToPadding="false"
+            android:orientation="vertical"
+            android:paddingTop="8dp"
+            android:paddingBottom="@dimen/global_padding_bottom" />
+    </com.cappielloantonio.tempo.helper.recyclerview.NestedScrollableHost>
+
+    <com.google.android.material.floatingactionbutton.FloatingActionButton
+        android:id="@+id/player_shuffle_queue_fab"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="bottom|end"
+        android:layout_margin="16dp"
+        app:layout_behavior="com.google.android.material.behavior.HideBottomViewOnScrollBehavior"
+        app:srcCompat="@drawable/ic_shuffle"/>
+</androidx.coordinatorlayout.widget.CoordinatorLayout>
 
-</com.cappielloantonio.tempo.helper.recyclerview.NestedScrollableHost>