package com.lxt008;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.Menu;import android.view.MenuInflater;import android.view.MenuItem;public class Activity01 extends Activity{    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);    }    /*创建menu*/    public boolean onCreateOptionsMenu(Menu menu)    {        MenuInflater inflater = getMenuInflater();        //设置menu界面为res/menu/menu.xml        inflater.inflate(R.menu.menu, menu);        return true;    }    /*处理菜单事件*/    public boolean onOptionsItemSelected(MenuItem item)    {        //得到当前选中的MenuItem的ID,        int item_id = item.getItemId();        switch (item_id)        {            case R.id.about:                /* 新建一个Intent对象 */                Intent intent = new Intent();                /* 指定intent要启动的类 */                intent.setClass(Activity01.this, Activity02.class);                /* 启动一个新的Activity */                startActivity(intent);                /* 关闭当前的Activity */                Activity01.this.finish();                break;            case R.id.exit:                Activity01.this.finish();                break;        }        return true;    }}

package com.lxt008;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;public class Activity02 extends Activity{    public void onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        /* 设置显示main2.xml布局 */        setContentView(R.layout.main2);    }    /*创建menu*/    public boolean onCreateOptionsMenu(Menu menu)    {        //为menu添加内容        menu.add(0, 0, 0, R.string.ok);        menu.add(0, 1, 1, R.string.back);        return true;    }    /*处理menu的事件*/    public boolean onOptionsItemSelected(MenuItem item)    {        //得到当前选中的MenuItem的ID,        int item_id = item.getItemId();        switch (item_id)        {            case 0:            case 1:                /* 新建一个Intent对象 */                Intent intent = new Intent();                /* 指定intent要启动的类 */                intent.setClass(Activity02.this, Activity01.class);                /* 启动一个新的Activity */                startActivity(intent);                /* 关闭当前的Activity */                Activity02.this.finish();                break;        }        return true;    }}

<menu xmlns:android="http://schemas.android.com/apk/res/android">    <item android:id="@+id/about"          android:title="关于" />    <item android:id="@+id/exit"          android:title="退出" /></menu>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><TextView      android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="@string/hello"    /></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    >    <TextView      android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="@string/hello2"    >    </TextView></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="hello">主界面,点击关于会跳到另一个界面!（Activity01）</string>    <string name="hello2">关于\nAndroid Menu使用范例！（Activity02）</string>    <string name="app_name">lxt008 Android Demo</string>    <string name="ok">确定</string>    <string name="back">返回</string></resources>