Android学习历程-使用菜单（menu）资源

学习备份笔记用：

菜单XML:

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

    <item android:title="File">
        <menu>
            <group
                android:id="@+id/noncheckable_group"
                android:checkableBehavior="none" >
                <item
                    android:id="@+id/newFile"
                    android:alphabeticShortcut="n"
                    android:title="New"/>
                <item
                    android:id="@+id/openFile"
                    android:alphabeticShortcut="o"
                    android:title="Open"/>
                <item
                    android:id="@+id/saveFile"
                    android:alphabeticShortcut="s"
                    android:title="Save"/>
            </group>
        </menu>
    </item>
    <item android:title="Edit">
        <menu>
            <group
                android:id="@+id/edit_group"
                android:checkableBehavior="single" >
                <item
                    android:id="@+id/cut"
                    android:title="Cut"/>
                <item
                    android:id="@+id/copy"
                    android:title="Copy"/>
                <item
                    android:id="@+id/past"
                    android:title="Past"/>
            </group>
        </menu>
    </item>
    <item
        android:title="Help">
        <menu>
            <group 
                android:id="@+id/help_group">
                <item 
                    android:id="@+id/about"
                    android:title="About"/>
                <item 
                    android:id="@+id/exit"
                    android:title="Exit"/>
            </group>
        </menu>
    </item>

</menu>

　　

布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
    
    <TextView 
        android:text="测试菜单资源"
        android:id="@+id/menuTextView01"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

　Activity：

package com.example.testmenu;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;

public class TestMenuActivity extends Activity {

	private MenuInflater mi;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.test_menu);
		mi = new MenuInflater(TestMenuActivity.this);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		mi.inflate(R.menu.test_menu, menu);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		switch (item.getItemId()) {
		case R.id.about:
			aboutAlert("本实例演示的是如何使用XML菜单资源来定义菜单！");
			break;

		case R.id.exit:
			exitAlert("真的要退出吗？");
			break;
		}
		return true;
	}

	//显示对话框
	private void exitAlert(String msg){
		//实例化AlertDialog。Builder
		AlertDialog.Builder builder = new AlertDialog.Builder(TestMenuActivity.this);
		builder.setMessage(msg).setCancelable(false).setPositiveButton("确定", new DialogInterface.OnClickListener() {
			
			@Override
			public void onClick(DialogInterface dialog, int which) {
				finish();
			}
		}).setNegativeButton("取消", new DialogInterface.OnClickListener() {
			
			@Override
			public void onClick(DialogInterface dialog, int which) {
				return;
			}
		});
		//创建对话框
		AlertDialog alert = builder.create();
		alert.show();
	}
	
	//显示对话框
	private void aboutAlert(String msg){
		//实例化AlertDialog。Builder
		AlertDialog.Builder builder = new AlertDialog.Builder(TestMenuActivity.this);
		builder.setMessage(msg).setCancelable(false).setPositiveButton("确定", new DialogInterface.OnClickListener() {
			
			@Override
			public void onClick(DialogInterface dialog, int which) {
			}
		});
		//创建对话框
		AlertDialog alert = builder.create();
		alert.show();
	}
	
}