SnapdragonMusic不能切换上一首/收藏列表中音乐不能取消

vendor/codeaurora/commonsys/packages/apps/SnapdragonMusic/src/com/android/music/MediaPlaybackActivity.java
  case GO_PRE:
                try {
                    int shuffle = mService.getShuffleMode();
                    int histSize = mService.getHistSize();
                    if (isGoStart(shuffle, histSize)) {
-                        mService.seek(0);
-                        mService.play();
+                        mService.prev();
                    } else {
                        mService.prev();
                    }
                } catch (RemoteException ex) {
                    ex.printStackTrace();
                }
                break;

diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 1ff8229..7788250 100755
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -37,7 +37,7 @@
     <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS"/>
     <uses-permission android:name="android.permission.READ_MEDIA_VIDEO" />
-
+    <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE"/>
     <!-- App Declaration -->
     <application
         android:icon="@drawable/app_music"
diff --git a/src/com/android/music/MusicBrowserActivity.java b/src/com/android/music/MusicBrowserActivity.java
index 8ab00e7..bd095ea 100755
--- a/src/com/android/music/MusicBrowserActivity.java
+++ b/src/com/android/music/MusicBrowserActivity.java
@@ -76,7 +76,8 @@ public class MusicBrowserActivity extends MediaPlaybackActivity implements
     private static final String[] REQUIRED_PERMISSIONS = {
             permission.READ_PHONE_STATE,
             permission.READ_MEDIA_AUDIO,
-            permission.POST_NOTIFICATIONS};
+            permission.POST_NOTIFICATIONS,
+            permission.MANAGE_EXTERNAL_STORAGE};