为RecyclerView添加优雅的点击事件、长按事件

本篇参考：Hugo的文章-Getting your clicks on RecyclerView

效果如下

一、完整的点击、长按事件支持类

1. 先要准备一份resources
   res -> values -> ids.xml ->

   <?xml version="1.0" encoding="utf-8"?>
   <resources>
   <item name="item_click_support" type="id" />
   </resources>

// 2. 具体的支持类
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);
    }

// 点击接口
public interface OnItemClickListener {
void onItemClicked(RecyclerView recyclerView, int position, View v);
    }

// 长按接口
public interface OnItemLongClickListener {
boolean onItemLongClicked(RecyclerView recyclerView, int position, View v);
    }
}

二、使用方式

可在setAdapter()之后调用

// 点击
ItemClickSupport.addTo(rv).setOnItemClickListener(new ItemClickSupport.OnItemClickListener() {
@Override public void onItemClicked(RecyclerView recyclerView, int position, View v) {
        Toast.makeText(MainActivity.this, mDatas.get(position), Toast.LENGTH_SHORT).show();
    }
});

// 长按
ItemClickSupport.addTo(rv).setOnItemLongClickListener(new ItemClickSupport.OnItemLongClickListener() {
@Override public boolean onItemLongClicked(RecyclerView recyclerView, int position, View v) {

        Toast.makeText(MainActivity.this, "长按" + mDatas.get(position) + "已删除", Toast.LENGTH_SHORT).show();

// 需要自己处理position在集合中的位置(需考虑头、身、脚布局数量)
        mDatas.remove(position);
if (lastVisible + 1 == mAdapter.getItemCount()) {
            addmore();
        }
        mAdapter.notifyItemRemoved(position);

// 消耗事件
return true;
    }
});