Recyclerview添加点击事件和长按事件

看鸿洋公众号早上推的文章，自己敲了一遍。。。

自从RecyclerView发布以来，由于其高度的可交互性被广泛使用。但是RecyclerView确没有像ListView一样提供onItemClickListener却让人比较难过，网上搜索了一番有不少解决方案，但是其本质都是通过给每个item添加onClickListener来模仿一个伪onItemClickListener，这种为每个item添加点击监听的解决方案不用多想也知道是浪费性能的方法。能不能像ListView那样使用一个监听解决问题呢？

查阅RecyclerView的api发现虽然没有提供onItemClickListener但是提供了addOnItemTouchListener方法：

RecyclerView.addOnItemTouchListener(OnItemTouchListener listener)

既然可以添加触摸监听，那么我们完全可以获取触摸手势来识别点击事件，然后通过触摸坐标来判断点击的是哪一个item。

直接上代码：

package com.glodon.reviewdemo;

import android.support.v4.view.GestureDetectorCompat;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;

/**
 * Created by liyx-k on 2016/5/12.
 */
public abstract class OnRecyclerItemClickListener implements RecyclerView.OnItemTouchListener{


    private final RecyclerView recyclerView;
    private final GestureDetectorCompat mGestureDetector;

    public OnRecyclerItemClickListener(RecyclerView recyclerView){
       this.recyclerView=recyclerView;
       mGestureDetector = new GestureDetectorCompat(recyclerView.getContext(),new ItemTouchHelperGestureListener());
    }

    @Override
    public void onTouchEvent(RecyclerView rv, MotionEvent e) {
        mGestureDetector.onTouchEvent(e);
    }

    @Override
    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

    }

    @Override
    public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
        mGestureDetector.onTouchEvent(e);
        return false;
    }

    public abstract void onItemClick(RecyclerView.ViewHolder viewHolder);

    public abstract void onItemLOngClick(RecyclerView.ViewHolder viewHolder);

    private class ItemTouchHelperGestureListener extends GestureDetector.SimpleOnGestureListener {

       public  boolean onSingleTapUp(MotionEvent event){
           View child = recyclerView.findChildViewUnder(event.getX(), event.getY());
           if (child != null){
               RecyclerView.ViewHolder viewHolder = recyclerView.getChildViewHolder(child);
               onItemClick(viewHolder);
           }
           return true;
       }

       public  void onLongPress(MotionEvent event){
           View child = recyclerView.findChildViewUnder(event.getX(), event.getY());
           if (child != null){
               RecyclerView.ViewHolder viewHolder = recyclerView.getChildViewHolder(child);
               onItemLOngClick(viewHolder);
           }
       }



    }
}

在代码里直接引用就行：