Media Button Play/Pause, Previous and Next in Background Player

app/src/main/AndroidManifest.xml

@@ -43,6 +43,12 @@
             android:launchMode="singleTask"
             android:label="@string/title_activity_background_player"/>
 
+        <receiver android:name="org.schabi.newpipe.player.BackgroundPlayer$MediaButtonReceiver">
+            <intent-filter>
+                <action android:name="android.intent.action.MEDIA_BUTTON" />
+            </intent-filter>
+        </receiver>
+
         <activity
             android:name=".player.PopupVideoPlayerActivity"
             android:launchMode="singleTask"

app/src/main/java/org/schabi/newpipe/player/BackgroundPlayer.java

@@ -22,10 +22,13 @@ package org.schabi.newpipe.player;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.app.Service;
+import android.content.BroadcastReceiver;
+import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.graphics.Bitmap;
+import android.media.AudioManager;
 import android.os.Build;
 import android.os.IBinder;
 import android.support.annotation.IntRange;
@@ -33,6 +36,7 @@ import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.v4.app.NotificationCompat;
 import android.util.Log;
+import android.view.KeyEvent;
 import android.view.View;
 import android.widget.RemoteViews;
 
@@ -77,6 +81,10 @@ public final class BackgroundPlayer extends Service {
 
     private BasePlayerImpl basePlayerImpl;
     private LockManager lockManager;
+
+    private AudioManager mAudioManager;
+    private ComponentName mReceiverComponent;
+
     /*//////////////////////////////////////////////////////////////////////////
     // Service-Activity Binder
     //////////////////////////////////////////////////////////////////////////*/
@@ -113,6 +121,10 @@ public final class BackgroundPlayer extends Service {
 
         mBinder = new PlayerServiceBinder(basePlayerImpl);
         shouldUpdateOnProgress = true;
+
+        mAudioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
+        mReceiverComponent = new ComponentName(this, MediaButtonReceiver.class);
+        mAudioManager.registerMediaButtonEventReceiver(mReceiverComponent);
     }
 
     @Override
@@ -151,6 +163,8 @@ public final class BackgroundPlayer extends Service {
         basePlayerImpl = null;
         lockManager = null;
 
+        mAudioManager.unregisterMediaButtonEventReceiver(mReceiverComponent);
+
         stopForeground(true);
         stopSelf();
     }
@@ -563,4 +577,37 @@ public final class BackgroundPlayer extends Service {
             lockManager.releaseWifiAndCpu();
         }
     }
+
+    public static class MediaButtonReceiver extends BroadcastReceiver {
+
+        public MediaButtonReceiver() {
+            super();
+        }
+
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            if (Intent.ACTION_MEDIA_BUTTON.equals(intent.getAction())) {
+                KeyEvent event = (KeyEvent) intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
+                if (event.getAction() == KeyEvent.ACTION_UP) {
+                    int keycode = event.getKeyCode();
+                    PendingIntent pendingIntent = null;
+                    if (keycode == KeyEvent.KEYCODE_MEDIA_NEXT) {
+                        pendingIntent = PendingIntent.getBroadcast(context, NOTIFICATION_ID, new Intent(ACTION_PLAY_NEXT), PendingIntent.FLAG_UPDATE_CURRENT);
+                    } else if (keycode == KeyEvent.KEYCODE_MEDIA_PREVIOUS) {
+                        pendingIntent = PendingIntent.getBroadcast(context, NOTIFICATION_ID, new Intent(ACTION_PLAY_PREVIOUS), PendingIntent.FLAG_UPDATE_CURRENT);
+                    } else if (keycode == KeyEvent.KEYCODE_HEADSETHOOK) {
+                        pendingIntent = PendingIntent.getBroadcast(context, NOTIFICATION_ID, new Intent(ACTION_PLAY_PAUSE), PendingIntent.FLAG_UPDATE_CURRENT);
+                    }
+                    if (pendingIntent != null) {
+                        try {
+                            pendingIntent.send();
+                        } catch (Exception e) {
+                            Log.e(TAG, "Error Sending intent MediaButtonReceiver", e);
+                        }
+                    }
+
+                }
+            }
+        }
+    }
 }