Step1: 自定义ItemTouchHelper.Callback

实现item的左右滑动删除和上下拖动必须自定义ItemTouchHelper.Callback，而自定义Callback必须重写3个方法、getMovementFlags(...)、onMove(...)、onSwipe(...)，而且需要传入数据集合+adapter,如果不想传这2个参数，可以写个回调并且修改这3个方法（交给回调处理，在activity/fragment界面处理滑动和拖动时间）

public class MyItemTouchCallback extends ItemTouchHelper.Callback {

    private RecyclerViewAdapter adapter;
    private List mData;

    public MyItemTouchCallback(RecyclerViewAdapter adapter, List mData) {
        this.adapter = adapter;
        this.mData = mData;
    }

    /**
     * 设置ItemTouchHelper的类型
     */
    @Override
    public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
        int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
        int swipeFlags = ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;
        return makeMovementFlags(dragFlags, swipeFlags);
    }

    /**
     * 上下拖动，
     * return true;//可以滑动
     */
    @Override
    public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
        int fromPosition = viewHolder.getAdapterPosition();
        int toPosition = target.getAdapterPosition();

        Collections.swap(mData, fromPosition, toPosition);
        adapter.notifyItemMoved(fromPosition, toPosition);//局部更新，如果item有点击事件的话，会出错position，就不要用了
//        adapter.notifyDataSetChanged();//没有动画效果，但适用于item有点击事件的话
        return true;//true:可以滑动
    }

    /**
     * 左右滑动删除
     */
    @Override
    public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
        int position = viewHolder.getAdapterPosition();
        mData.remove(position);
        adapter.notifyItemRemoved(position);//局部更新，如果item有点击事件的话，会出错position，就不要用了
//        adapter.notifyDataSetChanged();//没有动画效果，但适用于item有点击事件的话
    }
}

Step2: 使用回调

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    context = this;
    initData();
    recyclerView = (RecyclerView) findViewById(R.id.recyclerView);
    recyclerView.setLayoutManager(new LinearLayoutManager(context));
    recyclerView.setItemAnimator(new DefaultItemAnimator());
    recyclerView.addItemDecoration(new DividerItemDecoration(context,LinearLayoutManager.VERTICAL));

    RecyclerViewAdapter adapter = new RecyclerViewAdapter(mData);
    recyclerView.setAdapter(adapter);
    adapter.setOnItemClickListener(new RecyclerViewAdapter.OnItemClickListener() {
        @Override
        public void onItemClick(View view, int position) {
            ToastUtil.showShortToast(context,""+position);
        }
    });

    MyItemTouchCallback callback = new MyItemTouchCallback(adapter,mData);
    ItemTouchHelper itemTouchHelper = new ItemTouchHelper(callback);
    itemTouchHelper.attachToRecyclerView(recyclerView);
}

同理，设置GridLayoutManager、StaggeredGridLayoutManager也是一样的。

recyclerView.setLayoutManager(new GridLayoutManager(context,3));
recyclerView.setLayoutManager(new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL));