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;
    }
});