@Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    super.setCustomActionBar();

    CustomActionBar actionBar = this.getCustomActionBar();
    actionBar.setMiddleTitle(R.string.album);
    actionBar.setRightVisibility(View.INVISIBLE);
    actionBar.setLeftClickListener(
        new View.OnClickListener() {
          @Override
          public void onClick(View v) {
            finish();
          }
        });

    setContentView(R.layout.file_explorer);

    initUI();
    initData();
  }