阅读《Android 从入门到精通》（28）——使用 XML 的选项菜单

Posted 2022-12-03 SweetLoverFT

概述

关于选项菜单，请参考阅读《android 从入门到精通》（27）——选项菜单，不再赘述

程序示例

完整工程：http://download.csdn.net/detail/sweetloveft/9439976

1.MainActivity.java

package com.sweetlover.activity;

import com.sweetlover.optionmenu.R;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.Toast;

public class MainActivity extends Activity 

	@Override
	protected void onCreate(Bundle savedInstanceState) 
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	

	@Override
	public boolean onCreateOptionsMenu(Menu menu) 
		// TODO Auto-generated method stub
		MenuInflater inflater = getMenuInflater();
		inflater.inflate(R.menu.root, menu);
		return super.onCreateOptionsMenu(menu);
	

	@Override
	public boolean onPrepareOptionsMenu(Menu menu) 
		// TODO Auto-generated method stub
		return super.onPrepareOptionsMenu(menu);
	

	@Override
	public boolean onOptionsItemSelected(MenuItem item) 
		// TODO Auto-generated method stub
		switch (item.getItemId()) 
		case R.id.delete:
			Toast.makeText(MainActivity.this, "删除菜单被点击了！", Toast.LENGTH_SHORT)
					.show();
			break;
		case R.id.save:
			Toast.makeText(MainActivity.this, "保存菜单被点击了！", Toast.LENGTH_SHORT)
					.show();
			break;
		case R.id.help:
			Toast.makeText(MainActivity.this, "帮助菜单被点击了！", Toast.LENGTH_SHORT)
					.show();
			break;
		case R.id.add:
			Toast.makeText(MainActivity.this, "添加菜单被点击了！", Toast.LENGTH_SHORT)
					.show();
			break;
		case R.id.detail:
			Toast.makeText(MainActivity.this, "详细菜单被点击了！", Toast.LENGTH_SHORT)
					.show();
			break;
		case R.id.send:
			Toast.makeText(MainActivity.this, "发送菜单被点击了！", Toast.LENGTH_SHORT)
					.show();
			break;
		
		return super.onOptionsItemSelected(item);
	

	@Override
	public void onOptionsMenuClosed(Menu menu) 
		// TODO Auto-generated method stub
		super.onOptionsMenuClosed(menu);
		Toast.makeText(MainActivity.this, "选项菜单关闭了！", Toast.LENGTH_SHORT)
				.show();
	

2.activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="30dp" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="10dp"
        android:textSize="20sp"
        android:text="@string/tittle" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginTop="10dp"
        android:textSize="20sp"
        android:text="@string/note" />

</LinearLayout>

3.string.xml

<resources>

    <string name="app_name">OptionMenu</string>
    <string name="tittle">Option Menu Application</string>
    <string name="note">单击 Menu 键</string>
    <string name="oper1">删除</string>
    <string name="oper2">保存</string>
    <string name="oper3">帮助</string>
    <string name="oper4">添加</string>
    <string name="oper5">详细</string>
    <string name="oper6">发送</string>

</resources>

4.res/menu/root.xml

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

    <group
        android:id="@+id/group1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >
        <item
            android:id="@+id/delete"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:icon="@drawable/miku"
            android:orderInCategory="1"
            android:title="@string/oper1">
        </item>
        <item
            android:id="@+id/save"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:icon="@drawable/miku"
            android:orderInCategory="2"
            android:title="@string/oper2">
        </item>
        <item
            android:id="@+id/help"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:icon="@drawable/miku"
            android:orderInCategory="3"
            android:title="@string/oper3">
        </item>
        <item
            android:id="@+id/add"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:icon="@drawable/miku"
            android:orderInCategory="4"
            android:title="@string/oper4">
        </item>
        <item
            android:id="@+id/detail"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:icon="@drawable/miku"
            android:orderInCategory="5"
            android:title="@string/oper5">
        </item>
        <item
            android:id="@+id/send"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:icon="@drawable/miku"
            android:orderInCategory="6"
            android:title="@string/oper6">
        </item>
    </group>

</menu>