Single instance embedded music player

app/src/main/java/eu/faircode/email/MediaPlayerHelper.java

@@ -28,6 +28,7 @@ import android.media.AudioManager;
 import android.media.MediaPlayer;
 import android.net.Uri;
 import android.os.Build;
+import android.os.PowerManager;
 
 import androidx.core.app.NotificationCompat;
 import androidx.lifecycle.Lifecycle;
@@ -36,6 +37,7 @@ import androidx.lifecycle.LifecycleOwner;
 import androidx.lifecycle.OnLifecycleEvent;
 
 import java.io.IOException;
+import java.util.Objects;
 import java.util.concurrent.Semaphore;
 import java.util.concurrent.TimeUnit;
 
@@ -46,6 +48,10 @@ public class MediaPlayerHelper {
     private static Semaphore sem;
     private static final Object lock = new Object();
 
+    private static MediaPlayer player = null;
+    private static Uri uri = null;
+    private static Runnable onCompleted = null;
+
     static void stop(Context context) {
         EntityLog.log(context, "Alarm stop");
         synchronized (lock) {
@@ -155,6 +161,63 @@ public class MediaPlayerHelper {
         }
     }
 
+    static void startMusic(Context context, Uri uri, Runnable onCompleted) throws IOException {
+        stopMusic(context);
+
+        synchronized (lock) {
+            MediaPlayerHelper.uri = uri;
+            MediaPlayerHelper.onCompleted = onCompleted;
+
+            MediaPlayerHelper.player = new MediaPlayer();
+            MediaPlayerHelper.player.setAudioAttributes(
+                    new AudioAttributes.Builder()
+                            .setContentType(AudioAttributes.CONTENT_TYPE_MUSIC)
+                            .setUsage(AudioAttributes.USAGE_MEDIA)
+                            .build()
+            );
+            MediaPlayerHelper.player.setDataSource(context, uri);
+            MediaPlayerHelper.player.setWakeMode(context, PowerManager.PARTIAL_WAKE_LOCK);
+            MediaPlayerHelper.player.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
+                @Override
+                public void onPrepared(MediaPlayer mp) {
+                    // https://issuetracker.google.com/issues/36921987
+                    mp.start();
+                }
+            });
+            MediaPlayerHelper.player.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
+                @Override
+                public void onCompletion(MediaPlayer mp) {
+                    stopMusic(context);
+                }
+            });
+            MediaPlayerHelper.player.prepareAsync();
+        }
+    }
+
+    static void stopMusic(Context context) {
+        synchronized (lock) {
+            if (MediaPlayerHelper.player != null)
+                try {
+                    MediaPlayerHelper.player.stop();
+                } catch (Throwable ex) {
+                    Log.e(ex);
+                } finally {
+                    MediaPlayerHelper.player = null;
+                }
+            MediaPlayerHelper.uri = null;
+            if (MediaPlayerHelper.onCompleted != null) {
+                MediaPlayerHelper.onCompleted.run();
+                MediaPlayerHelper.onCompleted = null;
+            }
+        }
+    }
+
+    static boolean isPlaying(Uri uri) {
+        synchronized (lock) {
+            return (Objects.equals(MediaPlayerHelper.uri, uri));
+        }
+    }
+
     static void liveInCall(Context context, LifecycleOwner owner, IInCall intf) {
         AudioManager am = Helper.getSystemService(context, AudioManager.class);
         if (am == null || Build.VERSION.SDK_INT < Build.VERSION_CODES.S) {