以前觉得item上移下移侧滑删除挺难的，也不好写直接用人家的轮子就好了，可是这几天看到别人写的这种效果，用RecyclerView来写也不是很难吗？

思路

RecyclerView有个工具类,ItemTouchHelper,借助这个工具类就可以实现上面全部的效果了，主要用到ItemTouchHelper.CallBall这个接口。这里有三个主要用到的重写方法onMovementFlage() 、onMove()、onSwiped()，具体用法看代码。

item布局

<?xml version="1.0" encoding="utf-8"?>
<!--背景view，用于提示用户操作结果-->
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/rl_background"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <ImageView
        android:id="@+id/iv_done"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_marginLeft="16dp"
        android:layout_marginStart="16dp"
        android:src="@mipmap/ic_launcher"
        />



    <!--滑动操作的view-->
    <LinearLayout
        android:id="@+id/ll_item"
        android:layout_width="match_parent"
        android:layout_height="64dp"
        android:background="@android:color/white"
        android:gravity="center_vertical"
        android:orientation="vertical"
        android:paddingLeft="16dp"
        android:paddingRight="16dp">

        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceMedium"
            tools:text="Item" />

    </LinearLayout>

    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:layout_below="@id/ll_item"
        android:background="#B2B2b2" />

</RelativeLayout>

主要代码

 ItemTouchHelper.Callback callback = new ItemTouchHelper.Callback() {
      //判断手指滑动方向
        @Override
        public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
            int drag = ItemTouchHelper.UP|ItemTouchHelper.DOWN;
            int swipe =ItemTouchHelper.LEFT|ItemTouchHelper.RIGHT;

            return makeMovementFlags(drag,swipe);

        }
      //上下移动Item
        @Override
        public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
          //判断移动的item和目的位置是不是同种item
            if(viewHolder.getItemViewType() != target.getItemViewType())
            {
                return false;
            }
            ((MyViewHolder)viewHolder).ivDown.setVisibility(View.GONE);
            adapter.onItemMove(viewHolder.getAdapterPosition(),target.getAdapterPosition());
            return true;
        }
      //左右滑动item
        @Override
        public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {

            ((MyViewHolder)viewHolder).ivDown.setVisibility(View.VISIBLE);
            adapter.onItemSwipe(viewHolder.getAdapterPosition());

        }
      //选择一个item
        @Override
        public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) {

            if(viewHolder != null)
            {
              getDefaultUIUtil().onSelected(((MyViewHolder)viewHolder).llitem);

            }

        }
      //重绘item，在item下面
        @Override
        public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {

            getDefaultUIUtil().onDraw(c,recyclerView,((MyViewHolder)viewHolder).llitem, dX, dY, actionState, isCurrentlyActive);

        }
      //重绘item，在item上面
        @Override
        public void onChildDrawOver(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {

            getDefaultUIUtil().onDraw(c,recyclerView,((MyViewHolder)viewHolder).llitem, dX, dY, actionState, isCurrentlyActive);

        }
        //清理视图，回到默认状态
        @Override
        public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
            getDefaultUIUtil().clearView(((MyViewHolder)viewHolder).llitem);
        }
    };

adapter

 class  RecyclerAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>
    {

        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View view  = LayoutInflater.from(MainActivity.this).inflate(R.layout.item_recycler,parent,false);

            return new MyViewHolder(view);
        }

      //判断滑动的方向
        void onItemMove(int from,int to)
        {
            if(from<to)
            {
                for(int i=0;i<to-from;i++)
                {
                    Collections.swap(data,from+i,from+1+i);
                }
            }

            if(from>to)
            {
                for(int i=0;i<from-to;i++)
                    Collections.swap(data,from-1-i,from-i);
            }

            adapter.notifyItemMoved(from,to);

        }
//删除一个item
        void  onItemSwipe(int position){

            data.remove(position);
            adapter.notifyDataSetChanged();

        }



        @Override
        public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {

            ((MyViewHolder)holder).textView .setText(data.get(position));
        }

        @Override
        public int getItemCount() {
            return data.size();
        }
    }


    class  MyViewHolder extends RecyclerView.ViewHolder {
       public TextView textView;
        public ImageView ivDown;
        public LinearLayout llitem;

        public MyViewHolder(View itemView) {
            super(itemView);
            textView = (TextView) itemView.findViewById(R.id.textView);
            ivDown = (ImageView) itemView.findViewById(R.id.iv_done);
            llitem = (LinearLayout) itemView.findViewById(R.id.ll_item);
        }
    }

设置RecyclerView

  mRecyclerView = (RecyclerView) findViewById(R.id.recyclerView);
        mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
        mRecyclerView.setHasFixedSize(true);
        mRecyclerView.setItemAnimator(new DefaultItemAnimator());


        adapter = new RecyclerAdapter();
        ItemTouchHelper helper = new ItemTouchHelper(callback);
        //RecyclerView与ItemTouchHelper连接起来
        helper.attachToRecyclerView(mRecyclerView);


        mRecyclerView.setAdapter(adapter);
        adapter.notifyDataSetChanged();