Android随笔---menu菜单的使用

Posted 2022-01-27 William_Tao（攻城狮）

创建Menu资源

1.在res资源下，创建Resource Directory资源
2.创建menu.xml
3.创建菜单选项
4.重写创建菜单的Java代码
5.重写菜单的单个选项的操作函数

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@+id/add"
        android:title="增加" />
    <item
        android:id="@+id/delete"
        android:title="删除" />
</menu>

package com.example.firstapplication;

import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity 

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    

    @Override
    public boolean onCreateOptionsMenu(Menu menu) 
        getMenuInflater().inflate(R.menu.menu,menu);
        return  true;
    

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) 
        switch (item.getItemId())
            case R.id.add:
                Toast.makeText(this,"you check add",Toast.LENGTH_SHORT).show();
                break;
            case R.id.delete:
                Toast.makeText(this,"you check delete",Toast.LENGTH_SHORT).show();
                break;
            default:
        
        return true;