@Override
  public void findView() {
    ContentActivity activity = (ContentActivity) getActivity();
    grid_recyclerview = (RecyclerView) activity.findViewById(R.id.grid_recyclerview);

    activity.getSupportActionBar().setTitle(R.string.light_test);
    activity.getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    activity.getSupportActionBar().setDisplayShowHomeEnabled(true);

    // 创建一个线性布局管理器
    GridLayoutManager layoutManager =
        new GridLayoutManager(activity, 4, LinearLayoutManager.VERTICAL, false);

    // 设置布局管理器
    grid_recyclerview.setLayoutManager(layoutManager);
  }