Fixed the video view crash in SupportLeanbackShowcase master build

The "Video consumption Examples" view in SupportLeanBackShowcase was failing on
the master build (fugu-userdebug N AAC30 2573265 devkeys),
since onCreate gets called in the reverse order of fragments' appearence in the
code when using a single transaction.
Fixed that by using separate transactions per fragment addition, and now the
example video view works on the master build as well as the LMP-MR1 build.

Bug: 26894030

Change-Id: Ic020cb87049af7e2095387ca1aab017f2b026630

samples/SupportLeanbackShowcase/app/src/main/java/android/support/v17/leanback/supportleanbackshowcase/app/media/VideoConsumptionExampleFragment.java

@@ -17,7 +17,6 @@ package android.support.v17.leanback.supportleanbackshowcase.app.media;
 import android.app.Fragment;
 import android.os.Bundle;
 import android.support.v17.leanback.app.PlaybackOverlayFragment;
-import android.support.v17.leanback.supportleanbackshowcase.app.MainFragment;
 import android.support.v17.leanback.widget.Action;
 import android.support.v17.leanback.widget.ArrayObjectAdapter;
 import android.support.v17.leanback.widget.OnItemViewClickedListener;
@@ -34,6 +33,7 @@ public class VideoConsumptionExampleFragment extends PlaybackOverlayFragment imp
         OnItemViewClickedListener, MediaPlayerGlue.OnMediaFileFinishedPlayingListener {
 
     private static final String URL = "http://techslides.com/demos/sample-videos/small.mp4";
+    public static final String TAG = "VideoConsumptionExampleFragment";
     private ArrayObjectAdapter mRowsAdapter;
     private MediaPlayerGlue mGlue;
 
@@ -56,8 +56,10 @@ public class VideoConsumptionExampleFragment extends PlaybackOverlayFragment imp
         mGlue.setMetaData(metaData);
         mGlue.setMediaSource(URL);
 
+
         Fragment videoSurfaceFragment = getFragmentManager()
-                .findFragmentByTag(VideoExampleActivity.VIDEO_SURFACE_FRAGMENT_TAG);
+                .findFragmentByTag(VideoSurfaceFragment.TAG);
+
         SurfaceView surface = (SurfaceView) videoSurfaceFragment.getView();
         surface.getHolder().addCallback(new SurfaceHolder.Callback() {
             @Override

samples/SupportLeanbackShowcase/app/src/main/java/android/support/v17/leanback/supportleanbackshowcase/app/media/VideoExampleActivity.java

@@ -15,6 +15,7 @@
 package android.support.v17.leanback.supportleanbackshowcase.app.media;
 
 import android.app.Activity;
+import android.app.FragmentTransaction;
 import android.os.Bundle;
 import android.support.v17.leanback.supportleanbackshowcase.R;
 
@@ -23,17 +24,20 @@ import android.support.v17.leanback.supportleanbackshowcase.R;
  */
 public class VideoExampleActivity extends Activity {
 
-    public static final String VIDEO_SURFACE_FRAGMENT_TAG = "VIDEO_SURFACE";
+    public static final String TAG = "VideoExampleActivity";
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_video_example);
 
+        FragmentTransaction ft1 = getFragmentManager().beginTransaction();
+        ft1.replace(R.id.videoFragment, new VideoSurfaceFragment(), VideoSurfaceFragment.TAG);
+        ft1.commit();
 
-        getFragmentManager().beginTransaction()
+        FragmentTransaction ft2 = getFragmentManager().beginTransaction();
-                .replace(R.id.videoFragment, new VideoSurfaceFragment(), VIDEO_SURFACE_FRAGMENT_TAG)
+        ft2.add(R.id.videoFragment, new VideoConsumptionExampleFragment(), VideoConsumptionExampleFragment.TAG);
-                .add(R.id.videoFragment, new VideoConsumptionExampleFragment())
+        ft2.commit();
-                .commit();
     }
+
 }

samples/SupportLeanbackShowcase/app/src/main/java/android/support/v17/leanback/supportleanbackshowcase/app/media/VideoSurfaceFragment.java

@@ -18,6 +18,7 @@ import android.app.Fragment;
 import android.os.Bundle;
 import android.support.annotation.Nullable;
 import android.support.v17.leanback.supportleanbackshowcase.R;
+import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -25,9 +26,10 @@ import android.view.ViewGroup;
 
 public class VideoSurfaceFragment extends Fragment {
 
-    private static final String TAG = "VideoSurfaceFragment";
+    public static final String TAG = "VideoSurfaceFragment";
 
     @Override public void onCreate(Bundle savedInstanceState) {
+        Log.d(TAG, "onCreate started");
         super.onCreate(savedInstanceState);
 
     }

samples/SupportLeanbackShowcase/app/src/main/res/layout/activity_video_example.xml

@@ -16,12 +16,7 @@
 -->
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                 android:layout_width="match_parent"
-                android:layout_height="match_parent">
+                android:layout_height="match_parent"
+                android:id="@+id/videoFragment">
 
-    <RelativeLayout
-        android:id="@+id/videoFragment"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent">
-
-    </RelativeLayout>
 </RelativeLayout>