Android | ListView 长按删除列表项【学习笔记】

目录

        一、效果

        二、核心代码

        三、全部代码

        四、源码下载

---

一、效果

二、核心代码

• 监听器 - 长按弹出对话框 AdapterView.OnItemLongClickListener

 
    private final AdapterView.OnItemLongClickListener itemDeleteListener = new AdapterView.OnItemLongClickListener() {
        @Override
        public boolean onItemLongClick(AdapterView parent, View view, final int position, long id) {
 
            // 确认删除对话框构建
            AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
            builder.setMessage("确认删除?");
 
            // 点击对话框的 确认 按钮后的操作
            builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    numList.remove(position); // 从 numList 中删除点击的列表项
                    adapter.notifyDataSetChanged(); // 适配器数据刷新
                    Toast.makeText(getBaseContext(), "已删除", Toast.LENGTH_SHORT).show();
                }
            });
 
            // 点击对话框的 取消 按钮后的操作
            builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    // 无操作
                }
            });
 
            builder.create().show();
            return false;
        }
    };

• 绑定监听器

    // 绑定监听器
    listView.setOnItemLongClickListener(itemDeleteListener);

三、全部代码

1、XML

• activity_main.xml

"1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
 
    <ListView
        android:id="@+id/num_list"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
 
RelativeLayout>

• item.xml

"1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
 
    <TextView
        android:id="@+id/item_number"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"
        android:layout_centerHorizontal="true"
        android:text="number"
        android:textSize="30sp" />
 
RelativeLayout>

2.Java

• MainActivity.java

import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
 
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
 
import java.util.ArrayList;
 
public class MainActivity extends AppCompatActivity {
 
    private final String[] num = new String[]{"1", "2", "3", "4", "5", "6", "7", "8"};
    private ArrayList numList;
    private Adapter adapter;
 
    /**
     * 长按删除列表项
     */
    private final AdapterView.OnItemLongClickListener itemDeleteListener = new AdapterView.OnItemLongClickListener() {
        @Override
        public boolean onItemLongClick(AdapterView parent, View view, final int position, long id) {
 
            // 长按列表项的时候弹出 确认删除对话框
            AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
            builder.setMessage("确认删除?");
 
            // 点击对话框的 确认 按钮后的操作
            builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    numList.remove(position); // 从 numList 中删除点击的列表项
                    adapter.notifyDataSetChanged(); // 适配器数据刷新
                    Toast.makeText(getBaseContext(), "已删除", Toast.LENGTH_SHORT).show();
                }
            });
 
            // 点击对话框的 取消 按钮后的操作
            builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    // 无操作
                }
            });
 
            builder.create().show();
            return false;
        }
    };
 
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        ListView listView = findViewById(R.id.num_list);
        numList = new ArrayList<>();
 
        for (int i = 0; i < num.length; i++) {
            numList.add(num[i]);
        }
 
        adapter = new Adapter(MainActivity.this, R.layout.item, numList);
        listView.setAdapter(adapter);
        listView.setOnItemLongClickListener(itemDeleteListener);
    }
}

• Adapter.java

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
 
import java.util.List;
 
public class Adapter extends ArrayAdapter {
    private final int resourceId;
 
    private static class ViewHolder {
        TextView tvNum;
    }
 
    public Adapter(Context context, int resourceId, List data) {
        super(context, resourceId, data);
        this.resourceId = resourceId;
    }
 
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        String num = getItem(position);
        final ViewHolder viewHolder;
        View view;
 
        if (convertView == null) {
            view = LayoutInflater.from(getContext()).inflate(resourceId, parent, false);
            viewHolder = new ViewHolder();
            viewHolder.tvNum = view.findViewById(R.id.item_number);
            view.setTag(viewHolder);
        } else {
            view = convertView;
            viewHolder = (ViewHolder) view.getTag();
        }
 
        viewHolder.tvNum.setText(num);
        return view;
    }
}

四、源码下载

         ListView长按删除列表项