Android RecycleView点击item弹出对话框删除其item

适配器My Adapter.java

两个布局文件我就写了，和上次发布的博客一样，

package com.example.recyclerviewdemo;

import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import java.util.List;
import java.util.Map;

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
    private List<Map<String,Object>> list;
    private MyAdapter.OnItemClickListener onItemClickListener;//事件回调监听

    public MyAdapter(List<Map<String, Object>> list) {
        this.list = list;
    }

    //用于加载Item界面的布局文件，相当于getView方法中的创建View和ViewHolder对象
    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        //View view = View.inflate(parent.getContext(),R.layout.layout_item,null);//反射行布局
        View view = View.inflate(parent.getContext(),R.layout.layout_grid_item,null);//反射行布局
       // View view = View.inflate(parent.getContext(),R.layout.layout_staggered_item,null);//反射行布局
        MyViewHolder holder = new MyViewHolder(view);

        return holder;
    }
    //绑定数据和行布局
    @Override
    public void onBindViewHolder(@NonNull final MyViewHolder holder, final int position) {
        holder.icon.setImageResource((Integer) list.get(position).get("icon"));
        holder.title.setText((CharSequence) list.get(position).get("title"));
      //  holder.content.setText((CharSequence) list.get(position).get("content"));

        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                int position= holder.getLayoutPosition();
                onItemClickListener.onItemClick(holder.itemView,position);
            }
        });

        holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
            @Override
            public boolean onLongClick(View view) {
                int pos = holder.getLayoutPosition();
                onItemClickListener.onItemLongClick(holder.itemView,pos);
                return true;
            }
        });
    }

    @Override
    public int getItemCount() {
        return list.size();
    }

    public class MyViewHolder extends RecyclerView.ViewHolder{
        ImageView icon;
        TextView title;
       // TextView content;
        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            icon = itemView.findViewById(R.id.icon);
            title = itemView.findViewById(R.id.title);
   //         content = itemView.findViewById(R.id.content);
        }
    }

    public interface OnItemClickListener{
        void onItemClick(View view,int position);
        void onItemLongClick(View view,int position);
    }

    public void setOnItemClickListener(MyAdapter.OnItemClickListener listener){
        this.onItemClickListener = listener;
    }
}

MainActivity.java

package com.example.recyclerviewdemo;
//Edit By DY.memory
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.recyclerview.widget.StaggeredGridLayoutManager;
import android.content.DialogInterface;
import android.content.DialogInterface;
import android.os.Bundle;
import android.preference.DialogPreference;
import android.view.View;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class MainActivity extends AppCompatActivity {
    private ArrayList<Map<String,Object>> list;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        list = new ArrayList<>();
        //准备数据源
        initData();
        //获取recyclerView控件
        RecyclerView recyclerView = this.findViewById(R.id.recyclerView);
        //创建布局管理器
      //  LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        GridLayoutManager layoutManager = new GridLayoutManager(this,4);
        //StaggeredGridLayoutManager layoutManager = new StaggeredGridLayoutManager(2,StaggeredGridLayoutManager.VERTICAL);
       // layoutManager.setOrientation(RecyclerView.HORIZONTAL);
       // layoutManager.setReverseLayout(true);
        //设置布局管理器
        recyclerView.setLayoutManager(layoutManager);
        //创建适配器
        final MyAdapter adapter = new MyAdapter(list);
        adapter.setOnItemClickListener(new MyAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(View view, final int position) {
                //Toast.makeText(MainActivity.this,"点击了第"+position+"个item",Toast.LENGTH_SHORT).show();
                AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
                builder.setTitle("RecycleView");
                builder.setMessage("are you sure delate the item");
                builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        list.remove(position);
                        adapter.notifyDataSetChanged();

                    }
                });
                builder.setNeutralButton("cancel",null);


                builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
                        Toast.makeText(MainActivity.this,"点击了第"+position+"个item",Toast.LENGTH_SHORT).show();
                    }
                });
                builder.create().show();
            }

            @Override
            public void onItemLongClick(View view, int position) {
                Toast.makeText(MainActivity.this,"长按了第"+position+"个item",Toast.LENGTH_SHORT).show();
            }
        });
        //设置适配器
        recyclerView.setAdapter(adapter);
    }
    private void initData() {
        //准备数据源（List<Map>）
        list = new ArrayList<Map<String, Object>>();
        Map<String,Object> map = new HashMap<String,Object>();
        map.put("icon",R.drawable.cat);
        map.put("title","小猫");
        map.put("content","这是一只可爱的小猫。这是一只可爱的小猫。这是一只可爱的小猫。这是一只可爱的小猫。这是一只可爱的小猫。");
        list.add(map);

        map = new HashMap<String ,Object>();
        map.put("icon",R.drawable.fawn);
        map.put("title","小鹿");
        map.put("content","这是一只可爱的小鹿。这是一只可爱的小鹿。这是一只可爱的小鹿。这是一只可爱的小鹿。这是一只可爱的小鹿。");
        list.add(map);
        map = new HashMap<String ,Object>();
        map.put("icon",R.drawable.fawn);
        map.put("title","小鹿");
        map.put("content","这是一只可爱的小鹿。这是一只可爱的小鹿。这是一只可爱的小鹿。这是一只可爱的小鹿。这是一只可爱的小鹿。");
        list.add(map);
        map = new HashMap<String ,Object>();
        map.put("icon",R.drawable.fawn);
        map.put("title","小鹿");
        map.put("content","这是一只可爱的小鹿。这是一只可爱的小鹿。这是一只可爱的小鹿。这是一只可爱的小鹿。这是一只可爱的小鹿。");
        list.add(map);
        map = new HashMap<String ,Object>();
        map.put("icon",R.drawable.fawn);
        map.put("title","小鹿");
        map.put("content","这是一只可爱的小鹿。这是一只可爱的小鹿。这是一只可爱的小鹿。这是一只可爱的小鹿。这是一只可爱的小鹿。");
        list.add(map);
        map = new HashMap<String ,Object>();
        map.put("icon",R.drawable.fawn);
        map.put("title","小鹿");
        map.put("content","这是一只可爱的小鹿。这是一只可爱的小鹿。这是一只可爱的小鹿。这是一只可爱的小鹿。这是一只可爱的小鹿。");
        list.add(map);
        map = new HashMap<String ,Object>();
        map.put("icon",R.drawable.fawn);
        map.put("title","小鹿");
        map.put("content","这是一只可爱的小鹿。这是一只可爱的小鹿。这是一只可爱的小鹿。这是一只可爱的小鹿。这是一只可爱的小鹿。");
        list.add(map);

    }
}

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