Android ViewPager2 真的香么？

implementation 'androidx.viewpager2:viewpager2:1.0.0-alpha02'

public class ViewPagerActivity extends AppCompatActivity implements MyAdapter.OnItemClickListener {

    private ViewPager2 mVp;
    private List<Integer> list = new ArrayList<Integer>();
    private MyAdapter adapter;

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

        if (list != null) list.clear();
        list.add(Color.RED);
        list.add(Color.GRAY);
        list.add(Color.BLUE);
        list.add(Color.YELLOW);
        mVp = (ViewPager2) findViewById(R.id.view_pager);
        adapter = new MyAdapter(this, list);
        mVp.setAdapter(adapter);
        adapter.setOnItemClickListener(this);
    }

    @Override
    public void onItemClick(int position) {
        Toast.makeText(getApplication(), "当前position=" + (position + 1), Toast.LENGTH_SHORT).show();
        switch (position){
            case 0:
                //mVp.setLayoutDirection(View.LAYOUT_DIRECTION_RTL);
                break;
            case 1:
                list.set(position, Color.GREEN);
                adapter.notifyDataSetChanged();
                break;
            case 2:
                mVp.setOrientation(ViewPager2.ORIENTATION_HORIZONTAL);
                break;
            case 3:
                mVp.setOrientation(ViewPager2.ORIENTATION_VERTICAL);
                break;
        }
    }
}

class MyAdapter extends RecyclerView.Adapter {

    Context context;
    List<Integer> list;

    MyAdapter(Context context, List<Integer> list) {
        this.context = context;
        this.list = list;
    }

    private OnItemClickListener mOnItemClickListener;

    public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
        this.mOnItemClickListener = onItemClickListener;
    }

    public interface OnItemClickListener {
        void onItemClick(int position);
    }

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_view_pager, parent, false);
        final MyViewHolder mViewHolder = new MyViewHolder(v);
        v.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mOnItemClickListener != null) {
                    mOnItemClickListener.onItemClick((Integer) v.getTag());
                    if((Integer) v.getTag()==0){
                        mViewHolder.mTv.setLayoutDirection(View.LAYOUT_DIRECTION_RTL);
                    }
                }
            }
        });
        return mViewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, final int position) {
        ((MyViewHolder) holder).mLay.setBackgroundColor(list.get(position));
        ((MyViewHolder) holder).mTv.setText("当前 position = "+(position+1));
        ((MyViewHolder) holder).itemView.setTag(position);
    }

    @Override
    public int getItemCount() {
        return list != null ? list.size() : 0;
    }

    class MyViewHolder extends RecyclerView.ViewHolder {
        LinearLayout mLay;
        TextView mTv;

        public MyViewHolder(View itemView) {
            super(itemView);
            mLay = (LinearLayout) itemView.findViewById(R.id.item_view_pager_lay);
            mTv = (TextView) itemView.findViewById(R.id.item_view_pager_tv);
        }
    }
}