RecyclerView点击事件与长按事件,并添加点击效果

1.添加点击效果

为了让5.0以上的系统产生水波纹效果，所以我们新建一个drawable-v21目录来存放drawable文件 








5.0以下drawable文件

recycler_bg.xml 

[code]

    
        
            
        
    

5.0以上 drawable-v21  

recycler_rectangle.xml 

recycler_bg.xml 

[code]


    

[code]


    

在网上找了一下实现方法，有的说在adapter里添加回调接口来实现点击事件与长按事件。 
不过经过测试，有时候会产生这样的现象：点击item跳转到下一个页面，再返回回来时， 
item的点击事件会失效。后来在Stack Overflow找到了新的方法。 
原文链接如下：RecyclerView onClick。这里 贴上代码：

public class RecyclerItemClickListener implements RecyclerView.OnItemTouchListener {
    public interface OnItemClickListener {
        void onItemClick(View view, int position);

        void onItemLongClick(View view, int position);
    }

    private OnItemClickListener mListener;

    private GestureDetector mGestureDetector;

    public RecyclerItemClickListener(Context context, final RecyclerView recyclerView, OnItemClickListener listener) {
        mListener = listener;

        mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
            @Override
            public boolean onSingleTapUp(MotionEvent e) {
                return true;
            }

            @Override
            public void onLongPress(MotionEvent e) {
                View childView = recyclerView.findChildViewUnder(e.getX(), e.getY());

                if (childView != null && mListener != null) {
                    mListener.onItemLongClick(childView, recyclerView.getChildAdapterPosition(childView));
                }
            }
        });
    }

    @Override
    public boolean onInterceptTouchEvent(RecyclerView view, MotionEvent e) {
        View childView = view.findChildViewUnder(e.getX(), e.getY());

        if (childView != null && mListener != null && mGestureDetector.onTouchEvent(e)) {
            mListener.onItemClick(childView, view.getChildAdapterPosition(childView));
        }

        return false;
    }

    @Override
    public void onTouchEvent(RecyclerView view, MotionEvent motionEvent) {
    }

    @Override
    public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
    }
}

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然后在activity中添加事件即可

recyclerView.addOnItemTouchListener(new RecyclerItemClickListener(getActivity(), recyclerView, new RecyclerItemClickListener.OnItemClickListener() {
    @Override
    public void onItemClick(View view, int position) {
        // ...
    }

    @Override
    public void onItemLongClick(View view, int position) {
        // ...
    }
}));