@Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_play_movie_surface);

    mSurfaceView = (SurfaceView) findViewById(R.id.playMovie_surface);
    mSurfaceView.getHolder().addCallback(this);

    // Populate file-selection spinner.
    Spinner spinner = (Spinner) findViewById(R.id.playMovieFile_spinner);
    // Need to create one of these fancy ArrayAdapter thingies, and specify the generic layout
    // for the widget itself.
    mMovieFiles = MiscUtils.getFiles(getFilesDir(), "*.mp4");
    ArrayAdapter<String> adapter =
        new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, mMovieFiles);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    // Apply the adapter to the spinner.
    spinner.setAdapter(adapter);
    spinner.setOnItemSelectedListener(this);

    updateControls();
  }