RecyclerView新体验（2）

在上一篇RecyclerView新体验（1）介绍了RecyclerView的简单使用方法和分割线的设置，但是我们仔细一看，RecyclerView并没有给我们提供点击事件，尼~玛，这绝对是个坑啊，没办法，既然进了坑就想办法跳出去呗。
下面我们像ListView一样，写出点击和长按两个方法。Adapter代码如下：

public class CommonClickRecyclerViewAdapter extends RecyclerView.Adapter<CommonClickRecyclerViewAdapter.MyViewHolder> {    private Context context;    private List<String> list;    //定义接口    public interface OnItemClickListener {        void onItemClick(View view, int position);    } //定义接口    public interface OnItemLongClickListener {        void onItemLongClick(View view, int position);    }    //声明接口变量    private OnItemClickListener listener;    //声明接口变量    private OnItemLongClickListener lListener;    //暴露给使用者调用    public void setOnItemClickListener(OnItemClickListener listener) {        this.listener = listener;    }    public void setOnItemLongClickListener(OnItemLongClickListener lListener) {        this.lListener = lListener;    }    private ListView lv;    public CommonClickRecyclerViewAdapter(Context context, List<String> list) {        this.context = context;        this.list = list;    }    @Override    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        return new MyViewHolder(LayoutInflater.from(context).inflate(R.layout.item_rcv, null));    }    @Override    public void onBindViewHolder(MyViewHolder holder, final int position) {        holder.tv.setText(list.get(position));        if (listener != null) {            holder.layout.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View view) {                    listener.onItemClick(view, position);                }            });        }        if (lListener != null) {            holder.layout.setOnLongClickListener(new View.OnLongClickListener() {                @Override                public boolean onLongClick(View view) {                    lListener.onItemLongClick(view, position);                    return false;                }            });        }    }    @Override    public int getItemCount() {        return list.size();    }    public class MyViewHolder extends RecyclerView.ViewHolder {        TextView tv;        RelativeLayout layout;        public MyViewHolder(View itemView) {            super(itemView);            tv = (TextView) itemView.findViewById(R.id.tv);            layout = (RelativeLayout) itemView.findViewById(R.id.rl_item);        }    }}

这时候只需要我们在对RecyclerView的adapter进行监听就好，值得注意的是回调的参数是view和当前item的position（位置），要得到相应的值可通过position进行获取。监听代码如下：

adapter2.setOnItemClickListener(new CommonClickRecyclerViewAdapter.OnItemClickListener() {            @Override            public void onItemClick(View view, int position) {                Log.e("一样一样","点击了"+position+"元素");            }        });        adapter2.setOnItemLongClickListener(new CommonClickRecyclerViewAdapter.OnItemLongClickListener() {            @Override            public void onItemLongClick(View view, int position) {                Log.e("一样一样","点击了"+position+"元素");            }        });

得到的效果如下图：

到此，简单的点击和长按事件完成了，但是感觉有点不爽，每个Adapter都要自己写点击事件，那不是很麻烦？
我们想着点击事件回调的是position，那也就是与实体没有关系，于是我想到了在getview中把点击外的抽出来一个方法，做成一个基类。注：这次写的是一个接口回调两个方法。

public abstract class RAdapter<T extends RecyclerView.ViewHolder> extends RecyclerView.Adapter<RecyclerView.ViewHolder> {    //定义接口    public interface OnItemClickListener {        void onItemClick(View view, int position);        void onItemLongClick(View view, int position);    }    //声明接口变量    private OnItemClickListener listener;    //暴露给使用者调用    public void setOnItemClickListener(OnItemClickListener listener) {        this.listener = listener;    }    @Override    public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, final int position) {        onBindView(viewHolder, position);        if(listener != null) {            viewHolder.itemView.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View view) {                    listener.onItemClick(view,position);                }            });            viewHolder.itemView.setOnLongClickListener(new OnLongClickListener() {                @Override                public boolean onLongClick(View view) {                    listener.onItemLongClick(view,position);                    //如果是长按事件，那么久不用再触发点击事件了，所以返回true                    //将事件直接消费掉？？                    return true;                }            });        }    }    public abstract void onBindView(RecyclerView.ViewHolder holder, int position);}

这时候我们写的Adapter只要继承了RAdapter就可以在Activity中对adapter进行监听了，没有必要每次都在adapte中重写点击事件。
自己写的Adapter如下：

public class BaseOnClickAdapter extends RAdapter<BaseOnClickAdapter.MyViewHolder> {    private Context context;    private List<String> list;    public BaseOnClickAdapter(Context context, List<String> list) {        this.context = context;        this.list = list;    }    @Override    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        return new MyViewHolder(LayoutInflater.from(context).inflate(R.layout.item_rcv,null));    }    @Override    public int getItemCount() {        return list.size();    }    @Override    public void onBindView(RecyclerView.ViewHolder holder, int position) {        if(holder instanceof MyViewHolder) {            ((MyViewHolder) holder).tv.setText(list.get(position));        }    }class MyViewHolder extends RecyclerView.ViewHolder {    TextView tv;    public MyViewHolder(View itemView) {        super(itemView);        tv = (TextView) itemView.findViewById(R.id.tv);    }}}

这时候不是重写onBindViewHolder，而是重写onBindView（）方法就好。监听方法：

adapter2.setOnItemClickListener(new RAdapter.OnItemClickListener() {            @Override            public void onItemClick(View view, int position) {                Log.e("一样一样","点击了"+position+"元素");            }            @Override            public void onItemLongClick(View view, int position) {                Log.e("一样一样","长按了"+position+"元素");            }        });

点击和长按的结果如下

这样是不是方便很多了呢？有更好的方法望大神不吝赐教！很晚了，就到这里吧。