Merge pull request #2117 from orionlee/2105_support_rewind_in_lockscreen

Issue #2105 : support optional rewind in lockscreen 

1 files changed, 26 insertions, 2 deletions

diff --git a/core/src/main/java/de/danoeh/antennapod/core/service/playback/PlaybackService.java b/core/src/main/java/de/danoeh/antennapod/core/service/playback/PlaybackService.java
index 04b5b676d..eca3d1bb9 100644
--- a/core/src/main/java/de/danoeh/antennapod/core/service/playback/PlaybackService.java
+++ b/core/src/main/java/de/danoeh/antennapod/core/service/playback/PlaybackService.java
@@ -996,13 +996,37 @@ public class PlaybackService extends MediaBrowserServiceCompat {
             state = PlaybackStateCompat.STATE_NONE;
         }
         sessionState.setState(state, mediaPlayer.getPosition(), mediaPlayer.getPlaybackSpeed());
-        sessionState.setActions(PlaybackStateCompat.ACTION_PLAY_PAUSE
+        long capabilities = PlaybackStateCompat.ACTION_PLAY_PAUSE
                 | PlaybackStateCompat.ACTION_REWIND
                 | PlaybackStateCompat.ACTION_FAST_FORWARD
-                | PlaybackStateCompat.ACTION_SKIP_TO_NEXT);
+                | PlaybackStateCompat.ACTION_SKIP_TO_NEXT;
+
+        if (useSkipToPreviousForRewindInLockscreen()) {
+            // Workaround to fool Android so that Lockscreen will expose a skip-to-previous button,
+            // which will be used for rewind.
+            // The workaround is used for pre Lollipop (Androidv5) devices.
+            // For Androidv5+, lockscreen widges are really notifications (compact),
+            // with an independent codepath
+            //
+            // @see #sessionCallback in the backing callback, skipToPrevious implementation
+            //   is actually the same as rewind. So no new inconsistency is created.
+            // @see #setupNotification() for the method to create Androidv5+ lockscreen UI
+            //   with notification (compact)
+            capabilities = capabilities | PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS;
+        }
+
+        sessionState.setActions(capabilities);
         mediaSession.setPlaybackState(sessionState.build());
     }
 
+    private static boolean useSkipToPreviousForRewindInLockscreen() {
+        // showRewindOnCompactNotification() corresponds to the "Set Lockscreen Buttons"
+        // Settings in UI.
+        // Hence, from user perspective, he/she is setting the buttons for Lockscreen
+        return ( UserPreferences.showRewindOnCompactNotification() &&
+                 (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) );
+    }
+
     /**
      * Used by updateMediaSessionMetadata to load notification data in another thread.
      */