安卓——ContextMenue上下文菜单

r囧r小猫 2022-05-29 12:30 232阅读 0赞

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长按出现下图

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activity\_main.xml

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context="com.example.lenovo.contextmenue.MainActivity">
    
        <ListView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/listview"
            />
    
    
    
    </RelativeLayout>

menue文件夹下的main.xml

MainActivity.java

package com.example.lenovo.contextmenue;
    
    import android.app.Activity;
    import android.os.Bundle;
    import android.view.ContextMenu;
    import android.view.MenuInflater;
    import android.view.MenuItem;
    import android.view.View;
    import android.widget.ArrayAdapter;
    import android.widget.ListView;
    import android.widget.Toast;
    
    import java.util.ArrayList;
    
    import static android.widget.Toast.*;
    
    public class MainActivity extends Activity {
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            showListView();
        }
    
        /*
        显示ListView
         */
        void showListView(){
            ListView listView=(ListView)findViewById(R.id.listview);
            ArrayAdapter<String> arrayAdapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,getData());
            listView.setAdapter(arrayAdapter);
            //注册上下文菜单
            this.registerForContextMenu(listView);
        }
    
        /*
        重写onCreateContextMenu()方法
         */
        @Override
        public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
            super.onCreateContextMenu(menu, v, menuInfo);
    
            //设置menud显示内容
            menu.setHeaderTitle("文件操作");
            menu.setHeaderIcon(R.mipmap.ic_launcher_round);//此句竟然不显示图标？
            /*
            //用代码添加菜单选项
            menu.add(1,1,1,"复制");
            menu.add(1,2,1,"粘贴");
            menu.add(1,3,1,"剪切");
            menu.add(1,4,1,"重命名");
            */
            //用xml布局文件添加菜单选项
            MenuInflater inflater=getMenuInflater();
            inflater.inflate(R.menu.main,menu);
        }
    
        /*
        case语句冒号后面的注释对应用代码添加菜单选项时选项的id
        设置菜单项的点击事件,重写onContextItemSelected()方法
         */
    
        @Override
        public boolean onContextItemSelected(MenuItem item) {
           // return super.onContextItemSelected(item);
            switch(item.getItemId())
            {
                case R.id.context_menu_item1://1
                    Toast.makeText(MainActivity.this,"点击了复制", LENGTH_SHORT).show();
                    break;
                case R.id.context_menu_item2://2
                    Toast.makeText(MainActivity.this,"点击了粘贴", LENGTH_SHORT).show();
                    break;
                case R.id.context_menu_item3:
                    Toast.makeText(MainActivity.this,"点击了剪切", LENGTH_SHORT).show();
                    break;
                case R.id.context_menu_item4:
                    Toast.makeText(MainActivity.this,"点击了重命名", LENGTH_SHORT).show();
                    break;
            }
    
            return true;
        }
    
        /*
          返回ListView用的数据源
         */
        private ArrayList<String>  getData(){
    
            ArrayList<String> arrayList=new ArrayList<String>();
            for(int i=1;i<=5;i++){
                arrayList.add("文件"+i);
            }
            return arrayList;
        }
    }

[70]: /images/20220529/3bb82cd8e08244a88cbf4f6c095f59bc.png
[70 1]: /images/20220529/1351064033d5487db6ed67388b50d074.png
[70 2]: /images/20220529/7d436472aed24b57b1d5066cbc54d1a3.png
[70 3]: /images/20220529/fd7c007768104b1faf4e7400d5e94c21.png
[70 4]: /images/20220529/d3c0a1d474474e648379f24bfdcfdff1.png
[70 5]: https://img-blog.csdn.net/20180324113755474?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl8zODE5OTc3MA==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70
[70 6]: /images/20220529/3c0b2ddaac274d33bec0ffd5563bf597.png