Use MediaStyle Notification on Lollipop

fixes  #543

core/src/main/java/de/danoeh/antennapod/core/service/playback/PlaybackService.java

@@ -749,8 +749,8 @@ public class PlaybackService extends Service {
                 final int smallIcon = ClientConfig.playbackServiceCallbacks.getNotificationIconResource(getApplicationContext());
 
                 if (!isCancelled() &&
-                      started == true  &&
+                        started &&
-                      info.playable != null) {
+                        info.playable != null) {
                     String contentText = info.playable.getFeedTitle();
                     String contentTitle = info.playable.getEpisodeTitle();
                     Notification notification = null;
@@ -791,7 +791,7 @@ public class PlaybackService extends Service {
                                 .setLargeIcon(icon)
                                 .setSmallIcon(smallIcon)
                                 .setPriority(UserPreferences.getNotifyPriority()); // set notification priority
-                        if(newInfo.playerStatus == PlayerStatus.PLAYING){
+                        if (newInfo.playerStatus == PlayerStatus.PLAYING) {
                             notificationBuilder.addAction(android.R.drawable.ic_media_pause, //pause action
                                     getString(R.string.pause_label),
                                     pauseButtonPendingIntent);
@@ -800,11 +800,20 @@ public class PlaybackService extends Service {
                                     getString(R.string.play_label),
                                     playButtonPendingIntent);
                         }
-                        if(UserPreferences.isPersistNotify()) {
+                        if (UserPreferences.isPersistNotify()) {
                             notificationBuilder.addAction(android.R.drawable.ic_menu_close_clear_cancel, // stop action
                                     getString(R.string.stop_label),
                                     stopButtonPendingIntent);
                         }
+
+                        if (Build.VERSION.SDK_INT >= 21) {
+                            notificationBuilder.setStyle(new Notification.MediaStyle()
+                                    .setMediaSession((android.media.session.MediaSession.Token) mediaPlayer.getSessionToken().getToken())
+                                    .setShowActionsInCompactView(0))
+                                    .setVisibility(Notification.VISIBILITY_PUBLIC)
+                                    .setColor(Notification.COLOR_DEFAULT);
+                        }
+
                         notification = notificationBuilder.build();
                     } else {
                         NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(
@@ -813,7 +822,7 @@ public class PlaybackService extends Service {
                                 .setContentText(contentText).setOngoing(true)
                                 .setContentIntent(pIntent).setLargeIcon(icon)
                                 .setSmallIcon(smallIcon);
-                        notification = notificationBuilder.getNotification();
+                        notification = notificationBuilder.build();
                     }
                     startForeground(NOTIFICATION_ID, notification);
                     if (BuildConfig.DEBUG)

core/src/main/java/de/danoeh/antennapod/core/service/playback/PlaybackServiceMediaPlayer.java

@@ -6,6 +6,9 @@ import android.media.AudioManager;
 import android.media.RemoteControlClient;
 import android.net.wifi.WifiManager;
 import android.os.PowerManager;
+import android.support.v4.media.MediaMetadataCompat;
+import android.support.v4.media.session.MediaSessionCompat;
+import android.support.v4.media.session.PlaybackStateCompat;
 import android.telephony.TelephonyManager;
 import android.util.Log;
 import android.util.Pair;
@@ -48,6 +51,10 @@ public class PlaybackServiceMediaPlayer {
     private volatile PlayerStatus statusBeforeSeeking;
     private volatile IPlayer mediaPlayer;
     private volatile Playable media;
+    /**
+     * Only used for Lollipop notifications.
+     */
+    private final MediaSessionCompat mediaSession;
 
     private volatile boolean stream;
     private volatile MediaType mediaType;
@@ -89,6 +96,10 @@ public class PlaybackServiceMediaPlayer {
                 }
         );
 
+        mediaSession = new MediaSessionCompat(context, TAG);
+        mediaSession.setCallback(sessionCallback);
+        mediaSession.setFlags(MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS);
+
         mediaPlayer = null;
         statusBeforeSeeking = null;
         pausedBecauseOfTransientAudiofocusLoss = false;
@@ -181,6 +192,7 @@ public class PlaybackServiceMediaPlayer {
         setPlayerStatus(PlayerStatus.INITIALIZING, media);
         try {
             media.loadMetadata();
+            mediaSession.setMetadata(getMediaSessionMetadata(media));
             if (stream) {
                 mediaPlayer.setDataSource(media.getStreamUrl());
             } else {
@@ -211,6 +223,13 @@ public class PlaybackServiceMediaPlayer {
         }
     }
 
+    private MediaMetadataCompat getMediaSessionMetadata(Playable p) {
+        MediaMetadataCompat.Builder builder = new MediaMetadataCompat.Builder();
+        builder.putString(MediaMetadataCompat.METADATA_KEY_TITLE, p.getEpisodeTitle());
+        builder.putString(MediaMetadataCompat.METADATA_KEY_ALBUM, p.getFeedTitle());
+        return builder.build();
+    }
+
 
     /**
      * Resumes playback if the PSMP object is in PREPARED or PAUSED state. If the PSMP object is in an invalid state.
@@ -603,6 +622,9 @@ public class PlaybackServiceMediaPlayer {
         if (mediaPlayer != null) {
             mediaPlayer.release();
         }
+        if (mediaSession != null) {
+            mediaSession.release();
+        }
         releaseWifiLockIfNecessary();
     }
 
@@ -666,6 +688,16 @@ public class PlaybackServiceMediaPlayer {
         return new PSMPInfo(playerStatus, media);
     }
 
+    /**
+     * Returns a token to this object's MediaSession. The MediaSession should only be used for notifications
+     * at the moment.
+     *
+     * @return The MediaSessionCompat.Token object.
+     */
+    public MediaSessionCompat.Token getSessionToken() {
+        return mediaSession.getSessionToken();
+    }
+
     /**
      * Sets the player status of the PSMP object. PlayerStatus and media attributes have to be set at the same time
      * so that getPSMPInfo can't return an invalid state (e.g. status is PLAYING, but media is null).
@@ -683,6 +715,45 @@ public class PlaybackServiceMediaPlayer {
 
         this.playerStatus = newStatus;
         this.media = newMedia;
+
+        PlaybackStateCompat.Builder sessionState = new PlaybackStateCompat.Builder();
+
+        int state;
+        if (playerStatus != null) {
+            switch (playerStatus) {
+                case PLAYING:
+                    state = PlaybackStateCompat.STATE_PLAYING;
+                    break;
+                case PREPARED:
+                case PAUSED:
+                    state = PlaybackStateCompat.STATE_PAUSED;
+                    break;
+                case STOPPED:
+                    state = PlaybackStateCompat.STATE_STOPPED;
+                    break;
+                case SEEKING:
+                    state = PlaybackStateCompat.STATE_FAST_FORWARDING;
+                    break;
+                case PREPARING:
+                case INITIALIZING:
+                    state = PlaybackStateCompat.STATE_CONNECTING;
+                    break;
+                case INITIALIZED:
+                case INDETERMINATE:
+                    state = PlaybackStateCompat.STATE_NONE;
+                    break;
+                case ERROR:
+                    state = PlaybackStateCompat.STATE_ERROR;
+                    break;
+                default:
+                    state = PlaybackStateCompat.STATE_NONE;
+                    break;
+            }
+        } else {
+            state = PlaybackStateCompat.STATE_NONE;
+        }
+        sessionState.setState(state, PlaybackStateCompat.PLAYBACK_POSITION_UNKNOWN, getPlaybackSpeed());
+
         callback.statusChanged(new PSMPInfo(playerStatus, media));
     }
 
@@ -980,4 +1051,54 @@ public class PlaybackServiceMediaPlayer {
             }
         });
     }
+
+    private final MediaSessionCompat.Callback sessionCallback = new MediaSessionCompat.Callback() {
+
+        @Override
+        public void onPlay() {
+            if (playerStatus == PlayerStatus.PAUSED || playerStatus == PlayerStatus.PREPARED) {
+                resume();
+            } else if (playerStatus == PlayerStatus.INITIALIZED) {
+                setStartWhenPrepared(true);
+                prepare();
+            }
+        }
+
+        @Override
+        public void onPause() {
+            super.onPause();
+            if (playerStatus == PlayerStatus.PLAYING) {
+                pause(false, true);
+            }
+            if (UserPreferences.isPersistNotify()) {
+                pause(false, true);
+            } else {
+                pause(true, true);
+            }
+        }
+
+        @Override
+        public void onSkipToNext() {
+            super.onSkipToNext();
+            endPlayback();
+        }
+
+        @Override
+        public void onFastForward() {
+            super.onFastForward();
+            seekDelta(UserPreferences.getSeekDeltaMs());
+        }
+
+        @Override
+        public void onRewind() {
+            super.onRewind();
+            seekDelta(-UserPreferences.getSeekDeltaMs());
+        }
+
+        @Override
+        public void onSeekTo(long pos) {
+            super.onSeekTo(pos);
+            seekTo((int) pos);
+        }
+    };
 }