Handle prepare() in test media app

Now prepares the first playable item (in root) for playback

Test: Manual
Change-Id: I647c1ed518eb672bc89ad831daaedb6817c7b588

3 files changed, 24 insertions, 5 deletions

diff --git a/TestMediaApp/src/com/android/car/media/testmediaapp/TmaBrowser.java b/TestMediaApp/src/com/android/car/media/testmediaapp/TmaBrowser.java
index 2281ded..ec57473 100644
--- a/TestMediaApp/src/com/android/car/media/testmediaapp/TmaBrowser.java
+++ b/TestMediaApp/src/com/android/car/media/testmediaapp/TmaBrowser.java
@@ -152,10 +152,7 @@ public class TmaBrowser extends MediaBrowserServiceCompat {
             Preconditions.checkNotNull(queue);
             mSession.setQueue(queue.buildQueue());
 
-            TmaMediaItem firstItem = queue.getPlayableByIndex(0);
-            if (firstItem != null) {
-                mPlayer.onPrepareFromMediaId(firstItem.getMediaId(), null);
-            }
+            mPlayer.prepareMediaItem(queue.getPlayableByIndex(0));
         }
     }
 
diff --git a/TestMediaApp/src/com/android/car/media/testmediaapp/TmaMediaItem.java b/TestMediaApp/src/com/android/car/media/testmediaapp/TmaMediaItem.java
index 591f4cf..5c53d34 100644
--- a/TestMediaApp/src/com/android/car/media/testmediaapp/TmaMediaItem.java
+++ b/TestMediaApp/src/com/android/car/media/testmediaapp/TmaMediaItem.java
@@ -123,7 +123,11 @@ public class TmaMediaItem {
         return mParent;
     }
 
+    @Nullable
     TmaMediaItem getPlayableByIndex(long index) {
+        if (index < 0 || index >= mPlayableChildren.size()) {
+            return null;
+        }
         return mPlayableChildren.get((int)index);
     }
 
diff --git a/TestMediaApp/src/com/android/car/media/testmediaapp/TmaPlayer.java b/TestMediaApp/src/com/android/car/media/testmediaapp/TmaPlayer.java
index 7612cd3..3df5653 100644
--- a/TestMediaApp/src/com/android/car/media/testmediaapp/TmaPlayer.java
+++ b/TestMediaApp/src/com/android/car/media/testmediaapp/TmaPlayer.java
@@ -150,6 +150,25 @@ public class TmaPlayer extends MediaSessionCompat.Callback {
         super.onPrepareFromMediaId(mediaId, extras);
 
         TmaMediaItem item = mLibrary.getMediaItemById(mediaId);
+        prepareMediaItem(item);
+    }
+
+    @Override
+    public void onPrepare() {
+        super.onPrepare();
+        if (!mSession.isActive()) {
+            mSession.setActive(true);
+        }
+        // Prepare the first playable item (at root level) as the active item
+        if (mActiveItem == null) {
+            TmaMediaItem root = mLibrary.getRoot(mPrefs.mRootNodeType.getValue());
+            if (root != null) {
+                prepareMediaItem(root.getPlayableByIndex(0));
+            }
+        }
+    }
+
+    void prepareMediaItem(@Nullable TmaMediaItem item) {
         if (item != null && item.getParent() != null) {
             if (mIsPlaying) {
                 stopPlayback();
@@ -166,7 +185,6 @@ public class TmaPlayer extends MediaSessionCompat.Callback {
         }
     }
 
-
     @Override
     public void onSkipToQueueItem(long id) {
         super.onSkipToQueueItem(id);