Request sync when there's no mediaItem in a mediaSet.

This is to fix the problem where media items haven't been sync'ed when the album
set or album is viewed for the first time.

+ Add MediaSet.SyncListener.
+ Make AlbumPage and AlbumSetPage implement SyncListener.
+ Implement requestSync() for ComboAlbum and ComboAlbumSet.
+ add ActivityState.isDestroyed(). This also fixes the problem where
  StateManager.finishState() may be called twice.

Bug: 5337899
Change-Id: I25364c3ac25721a2650701c5d7931bfb6daa9303

1 files changed, 6 insertions, 0 deletions

diff --git a/src/com/android/gallery3d/data/ComboAlbumSet.java b/src/com/android/gallery3d/data/ComboAlbumSet.java
index aa196039d..16adc12f4 100644
--- a/src/com/android/gallery3d/data/ComboAlbumSet.java
+++ b/src/com/android/gallery3d/data/ComboAlbumSet.java
@@ -18,6 +18,7 @@ package com.android.gallery3d.data;
 
 import com.android.gallery3d.R;
 import com.android.gallery3d.app.GalleryApp;
+import com.android.gallery3d.util.Future;
 
 // ComboAlbumSet combines multiple media sets into one. It lists all sub
 // media sets from the input album sets.
@@ -77,4 +78,9 @@ public class ComboAlbumSet extends MediaSet implements ContentListener {
     public void onContentDirty() {
         notifyContentChanged();
     }
+
+    @Override
+    public Future<Integer> requestSync(SyncListener listener) {
+        return requestSyncOnEmptySets(mSets, listener);
+    }
 }