如何处理一个RecyclerView列表点击事件，在网上一般能搜到两种方案：
从ViewHolder中得到rootView，然后进行setOnClickListener();
实现RecyclerView.OnItemTouchListener接口，从Touch事件中分发出Click事件；
这两种解决方案在网上都有讲解，想了解更多的，可以参考这篇博客，我在实际开发中，更倾向于第一种方案，因为这种方案比较简单，但是每次还得在ViewHoler中写代码，很多时候点击事件的逻辑应该在activity中实现，这样还得定义用于回调的接口，然后从activity得到viewHoler对象，set事件，作为一个有洁癖的程序员，这是多么邋遢的写法，但更可耻的是，我竟然一直在默默接受了；
今天在闲逛国外大牛博客时，发现一种封装的技巧，也是基于view的setOnClickListener方法，但不是在viewHolder获取view；
先看看怎么调用：
1 | ItemClickSupport.addTo(mRecyclerView).setOnItemClickListener(new ItemClickSupport.OnItemClickListener() { |
ItemClickSupport源码也很简单：1
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88public 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);
}
}
同时，你还需要在ids.xml中定义一个名字为item_click_support的id:
1 |
|
或者，你可以把R.id.item_click_support换成一个自己明白的int数值，这样就不用定义id了；
注意：请在不需要监听时或者activity销毁前，remove掉callBack
感谢代码出处作者，感谢大家的阅读，如果使用中有什么bug，欢迎一起探讨！
代码出处：http://www.littlerobots.nl/blog/Handle-Android-RecyclerView-Clicks