Add null check for the media player when surface texture is available.

- Call to MediaPlayer.create() method can return null, and hence we need
to check the return value before trying access the media player.

Change-Id: I4a5e0edbd6db21b678efb05ea733187f34185432
Fix: 36668356
Test: make RunSettingsRoboTests

src/com/android/settings/fingerprint/FingerprintLocationAnimationVideoView.java

@@ -24,6 +24,7 @@ import android.media.MediaPlayer;
 import android.media.MediaPlayer.OnInfoListener;
 import android.media.MediaPlayer.OnPreparedListener;
 import android.net.Uri;
+import android.support.annotation.VisibleForTesting;
 import android.util.AttributeSet;
 import android.view.Surface;
 import android.view.TextureView;
@@ -73,7 +74,11 @@ public class FingerprintLocationAnimationVideoView extends TextureView
                     mTextureToDestroy.release();
                     mTextureToDestroy = null;
                 }
-                mMediaPlayer = MediaPlayer.create(mContext, videoUri);
+                mMediaPlayer = createMediaPlayer(mContext, videoUri);
+                if (mMediaPlayer == null) {
+                    // MediaPlayer.create() method can return null
+                    return;
+                }
                 mMediaPlayer.setSurface(new Surface(surfaceTexture));
                 mMediaPlayer.setOnPreparedListener(new OnPreparedListener() {
                     @Override
@@ -113,6 +118,11 @@ public class FingerprintLocationAnimationVideoView extends TextureView
         });
     }
 
+    @VisibleForTesting
+    MediaPlayer createMediaPlayer(Context context, Uri videoUri) {
+        return MediaPlayer.create(mContext, videoUri);
+    }
+
     protected static Uri resourceEntryToUri (Context context, int id) {
         Resources res = context.getResources();
         return Uri.parse(ContentResolver.SCHEME_ANDROID_RESOURCE + "://" +