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RecyclerViewItem.java
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RecyclerViewItem.java
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package template;
import android.os.SystemClock;
import android.view.ContextMenu;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;
import java.util.WeakHashMap;
/**
* 给RecyclerView的Item添加上下文菜单,和点击事件
*/
public class RecyclerViewItem extends RecyclerView.Adapter<MyViewHolder> implements View.OnCreateContextMenuListener, View.OnClickListener {
ArrayList<String> datas;
//已选中的位置,划重点
int selectedPosition = RecyclerView.NO_POSITION;
//保存映射,划重点
WeakHashMap<View, MyViewHolder> item2Holder = new WeakHashMap<>(10);
ItemInterface itemInterface;//用于传递Item的点击事件
@NonNull
@Override
public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(android.R.layout.simple_list_item_1, parent, false);
view.setOnCreateContextMenuListener(this);//划重点,上下文菜单
view.setOnClickListener(this);//划重点,点击事件
return new MyViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
//先做好映射
item2Holder.put(holder.itemView, holder);//划重点
//再绑定数据
}
@Override
public int getItemCount() {
return null == datas? 0 : datas.size();
}
/*
在Activity 或者Fragment中重写上下文菜单点击方法
@Override
public boolean onContextItemSelected(MenuItem item) {
if (item.getItemId() == ContextMenu.FIRST
&& RecyclerView.NO_POSITION != adapter.selectedPosition) {
deleteData();
adapter.selectedPosition = RecyclerView.NO_POSITION;//清除位置
}
return super.onContextItemSelected(item);
}
*/
//实现View.OnCreateContextMenuListener
@Override//上下文菜单
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
selectedPosition = item2Holder.get(v).getAdapterPosition();//划重点
menu.add(ContextMenu.NONE, ContextMenu.FIRST, ContextMenu.NONE, "删除");
menu.add(ContextMenu.NONE, ContextMenu.FIRST + 1, ContextMenu.NONE, "收藏");
}
//View.OnClickListener
@Override//item点击事件
public void onClick(View v) {
itemInterface.onItemClick(item2Holder.get(v).getAdapterPosition());//划重点
}
public static interface ItemInterface {
void onItemClick(int position);
void onItemLongClick(int position);
}
}
class MyViewHolder extends RecyclerView.ViewHolder {
TextView tv1,
tv2,
tv3;
public MyViewHolder(@NonNull View itemView) {
super(itemView);
// tv1 = itemView.findViewById(R.id.tv1);
// tv2 = itemView.findViewById(R.id.tv2);
// tv3 = itemView.findViewById(R.id.tv3);
}
}