在RecycleView中，并没有直接为Item开放OnItemClick等点击事件，这需要我们自己动手来完成。
下面介绍三中比较常用的方法来实现添加点击事件。
在adapter中添加点击事件
比较常见的一种方法。在使用listView时，我们有时候也会使用这种方法来实现添加点击事件。因为在
adapter中添加点击事件的可以实现最item子view点击事件的监控。
思路如下：</br>
在adapter中新建并暴露自己定义的接口类型。
private OnRecyclerViewItemClickListener mOnItenClickListener = null;
private OnRecyclerViewItemLongClickListener mOnItemLongClickListener = null;
public void setOnItemClickListener(OnRecyclerViewItemClickListener listener){
this.mOnItenClickListener = listener;
}
public void setOnItemLongClickListener(OnRecyclerViewItemLongClickListener listener){
this.mOnItemLongClickListener = listener;
}
在adapter中添加对指定元素的的点击事件。
v.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
if(mOnItemLongClickListener!=null)
mOnItemLongClickListener.OnItemLongClickListener(v, (Integer) v.getTag());
return false;
}
});
在接口调用中，调用自己定义的接口来进行实现。
@Override
public void onClick(View v) {
if(mOnItemLongClickListener !=null)
mOnItenClickListener.OnItemClickListener(v, (Integer) v.getTag());
}
在activity中调用接口实现监听
mMyAdapter.setOnItemClickListener(new MyAdapter.OnRecyclerViewItemClickListener() {
@Override
public void OnItemClickListener(View view, int position) {
Toast.makeText(MainActivity.this,"通过方法3实现的点击事件"+position,Toast.LENGTH_SHORT).show();
}
});
mMyAdapter.setOnItemLongClickListener(new MyAdapter.OnRecyclerViewItemLongClickListener() {
@Override
public void OnItemLongClickListener(View view, int position) {
Toast.makeText(MainActivity.this,"通过方法3实现的点击事件长安"+position,Toast.LENGTH_SHORT).show();
}
});
通过重写GestureDetectorCompat实现监听
虽然RecycleView没有直接实现对应的点击事件，但是在它给我们提供的api中，会发现它还是给我们预留了接口来进行实现
。通过重写GestureDetectorCompat来实现对item点击事件的监控。
private GestureDetectorCompat gestureDetectorCompat;
public interface OnItemClickListener{
void onItemClick(View view, int position);
void onItemLongClick(View view,int postion);
}
public ItemClickListener(final RecyclerView recyclerView,final OnItemClickListener clickListener) {
gestureDetectorCompat = new GestureDetectorCompat(recyclerView.getContext(),
new GestureDetector.SimpleOnGestureListener(){
@Override
public boolean onSingleTapUp(MotionEvent e) {
View childView = recyclerView.findChildViewUnder(e.getX(),e.getY());
if(childView != null && clickListener!= null){
clickListener.onItemClick(childView,recyclerView.getChildAdapterPosition(childView));
}
return true;
}
@Override
public void onLongPress(MotionEvent e) {
View childView = recyclerView.findChildViewUnder(e.getX(),e.getY());
if(childView != null && clickListener != null){
clickListener.onItemLongClick(childView,recyclerView.getChildAdapterPosition(childView));
}
}
});
}
@Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
gestureDetectorCompat.onTouchEvent(e);
return false;
}
在Activity中进行调用，可以参照下面：
mRecyclerView.addOnItemTouchListener(new ItemClickListener(mRecyclerView, new ItemClickListener.OnItemClickListener() {
@Override
public void onItemClick(View view, int position) {
Toast.makeText(MainActivity.this, "通过方法1实现的点击事件" + position, Toast.LENGTH_SHORT).show();
}
@Override
public void onItemLongClick(View view, int position) {
Toast.makeText(MainActivity.this, "通过方法1实现的点击事件" + position, Toast.LENGTH_SHORT).show();
}
}));
利用OnChildAttachStateChangeListener来实现
参照博客http://www.littlerobots.nl/blog/Handle-Android-RecyclerView-Clicks/
package com.hut.reoger.studentsrecycleview.addClickListener;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import com.hut.reoger.studentsrecycleview.R;
/**
* Created by 24540 on 2017/3/28.
* 为Item添加点击事件：方法二：利用OnChildAttachStateChangeListener来实现
* 同时，使用方法，可以实现对item子控件的监听，具体实现参见类：
* 参考链接：http://www.littlerobots.nl/blog/Handle-Android-RecyclerView-Clicks/
*/
public class ItemClickSupport {
private final RecyclerView mRecyclerView;
private OnItemClickListener mOnItemClickListener;
private OnItemLongClickListener mOnItemLongClickListener;
private View.OnClickListener mOnClickListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mOnItemClickListener != null) {
RecyclerView.ViewHolder holder = mRecyclerView.getChildViewHolder(v);
mOnItemClickListener.onItemClicked(mRecyclerView, holder.getAdapterPosition(), v);
}
}
};
private View.OnLongClickListener mOnLongClickListener = new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
if (mOnItemLongClickListener != null) {
RecyclerView.ViewHolder holder = mRecyclerView.getChildViewHolder(v);
return mOnItemLongClickListener.onItemLongClicked(mRecyclerView, holder.getAdapterPosition(), v);
}
return false;
}
};
private RecyclerView.OnChildAttachStateChangeListener mAttachListener
= new RecyclerView.OnChildAttachStateChangeListener() {
@Override
public void onChildViewAttachedToWindow(View view) {
if (mOnItemClickListener != null) {
view.setOnClickListener(mOnClickListener);
}
if (mOnItemLongClickListener != null) {
view.setOnLongClickListener(mOnLongClickListener);
}
}
@Override
public void onChildViewDetachedFromWindow(View view) {}
};
private ItemClickSupport(RecyclerView recyclerView) {
mRecyclerView = recyclerView;
mRecyclerView.setTag(R.id.item_click_support, this);
mRecyclerView.addOnChildAttachStateChangeListener(mAttachListener);
}
public static ItemClickSupport addTo(RecyclerView view) {
ItemClickSupport support = (ItemClickSupport) view.getTag(R.id.item_click_support);
if (support == null) {
support = new ItemClickSupport(view);
}
return support;
}
public static ItemClickSupport removeFrom(RecyclerView view) {
ItemClickSupport support = (ItemClickSupport) view.getTag(R.id.item_click_support);
if (support != null) {
support.detach(view);
}
return support;
}
public ItemClickSupport setOnItemClickListener(OnItemClickListener listener) {
mOnItemClickListener = listener;
return this;
}
public ItemClickSupport setOnItemLongClickListener(OnItemLongClickListener listener) {
mOnItemLongClickListener = listener;
return this;
}
private void detach(RecyclerView view) {
view.removeOnChildAttachStateChangeListener(mAttachListener);
view.setTag(R.id.item_click_support, null);
}
public interface OnItemClickListener {
void onItemClicked(RecyclerView recyclerView, int position, View v);
}
public interface OnItemLongClickListener {
boolean onItemLongClicked(RecyclerView recyclerView, int position, View v);
}
}
在MainActivity监听如下：
ItemClickSupport.addTo(mRecyclerView).setOnItemClickListener(new ItemClickSupport.OnItemClickListener() {
@Override
public void onItemClicked(RecyclerView recyclerView, int position, View v) {
Toast.makeText(MainActivity.this,"通过方法2实现的点击事件"+position,Toast.LENGTH_SHORT).show();
}
});
ItemClickSupport.addTo(mRecyclerView).setOnItemLongClickListener(new ItemClickSupport.OnItemLongClickListener() {
@Override
public boolean onItemLongClicked(RecyclerView recyclerView, int position, View v) {
Toast.makeText(MainActivity.this,"通过方法2实现的点击事件长安"+position,Toast.LENGTH_SHORT).show();
return false;
}
});
用这种方法，也可以实现对item的子view进行监控。具体实现可以参见我的代码。
综上，三种方法都可以实现对item点击事件的监控。
方法1和方法3都可以实现对item的子view实现监听。
方法2可以很方便实现对获取点击位置信息。
方法1附加在adapter中，代码有点耦合，不推荐使用方法1。
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