Android控件之菜单的创建方式

package com.example.androidthismenus;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends Activity {
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
 }
 //用于创建选项菜单的事件方法,在打开界面是会被自动调用
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  //getMenuInflater().inflate(R.menu.main, menu);
  //参数1(组id)参数2(当前选项的id的id)参数3(项目排序的编号)参数4(项目的标题)
  menu.add(0, 100, 1, "设置游戏");
  menu.add(0, 200, 2, "开始游戏");
  menu.add(0, 300, 3, "退出游戏");
  menu.add(0, 400, 4, "开始游戏");
  return true;
 }
 //当选项菜单被点击时调用的事件方法
 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
  // Handle action bar item clicks here. The action bar will
  // automatically handle clicks on the Home/Up button, so long
  // as you specify a parent activity in AndroidManifest.xml.
  int id = item.getItemId();
  if (id == R.id.action_settings) {
   return true;
  }
  return super.onOptionsItemSelected(item);
 }
}

<?xml version="1.0" encoding="utf-8"? 
<menu xmlns:android="http://schemas.android.com/apk/res/android"  
 <item
  android:id="@+id/menu_new"
  android:icon="@android:drawable/ic_menu_help"
  android:title="新建"/ 
 <item
  android:id="@+id/menu_delete"
  android:icon="@android:drawable/ic_menu_delete"
  android:title="删除"/ 
 <item android:title="子菜单" 
  <menu  
   <item android:id="@+id/menu_sub1"
    android:title="子菜单1"/ 
   <item android:id="@+id/menu_sub2"
    android:title="子菜单2"/ 
  </menu 
 </item 
</menu 

// 通过配置文件来在Activyt当中填充menu菜单
MenuInflater mInflater = getMenuInflater(); mInflater.inflate(R.menu.menu, menu);