RecyclerView新体验（2） |
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RecyclerView新体验（2）
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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 { private Context context; private List 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 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 extends RecyclerView.Adapter { //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 { private Context context; private List list; public BaseOnClickAdapter(Context context, List 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 |
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