<menu xmlns:android="http://schemas.android.com/apk/res/android">
 <item android:id="@+id/about"
   android:title="關(guān)于" />
 <item android:id="@+id/exit"
   android:title="退出" />
</menu>

package com.yarin.android.Examples_04_13;
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);
 }
 /*創(chuàng)建menu*/
 public boolean onCreateOptionsMenu(Menu menu)
 {
  //MenuInflater class is used to instantiate menu XML files into Menu objects
  MenuInflater inflater = getMenuInflater();
  //設(shè)置menu界面為res/menu/menu.xml
  inflater.inflate(R.menu.menu, menu);
  return true;
 }
 /*處理菜單事件*/
 public boolean onOptionsItemSelected(MenuItem item)
 {
  //得到當(dāng)前選中的MenuItem的ID,
  int item_id = item.getItemId();
  switch (item_id)
  {
   case R.id.about:
    /* 新建一個(gè)Intent對(duì)象 */
    Intent intent = new Intent();
    /* 指定intent要啟動(dòng)的類 */
    intent.setClass(Activity01.this, Activity02.class);
    /* 啟動(dòng)一個(gè)新的Activity */
    startActivity(intent);
    /* 關(guān)閉當(dāng)前的Activity */
    Activity01.this.finish();
    break;
   case R.id.exit:
    Activity01.this.finish();
    break;
  }
  return true;
 }
}

package com.yarin.android.Examples_04_13;
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);
  /* 設(shè)置顯示main2.xml布局 */
  setContentView(R.layout.main2);
 }
 /*創(chuàng)建menu*/
 public boolean onCreateOptionsMenu(Menu menu)
 {
  //為menu添加內(nèi)容
  menu.add(0, 0, 0, R.string.ok);
  menu.add(0, 1, 1, R.string.back);
  return true;
 }
 /*處理menu的事件*/
 public boolean onOptionsItemSelected(MenuItem item)
 {
  //得到當(dāng)前選中的MenuItem的ID,
  int item_id = item.getItemId();
  switch (item_id)
  {
   case 0:
   case 1:
    /* 新建一個(gè)Intent對(duì)象 */
    Intent intent = new Intent();
    /* 指定intent要啟動(dòng)的類 */
    intent.setClass(Activity02.this, Activity01.class);
    /* 啟動(dòng)一個(gè)新的Activity */
    startActivity(intent);
    /* 關(guān)閉當(dāng)前的Activity */
    Activity02.this.finish();
    break;
  }
  return true;
 }
}