Android菜单应用（Menu）_移动开发_编程开发_程序员俱乐部

整体运行效果如下图：

具体实现：

1、创建过程，工程名为Menu

2、在工程目录“res/menu”目录下创建一个名为menu.xml的文件，内容如下：

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1 <?xml version="1.0" encoding="utf-8"?>
2 <menu xmlns:android="http://schemas.android.com/apk/res/android" >
3     <item
4         android:id="@+id/help"
5         android:title="帮助"/>"
6     <item
7         android:id="@+id/our"
8         android:title="联系我们"/>
9 </menu>

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3、编写MainActivity.java的文件。具体代码如下：

 1 package com.example.menu;
 2 
 3 import android.app.Activity;
 4 import android.app.ActionBar;
 5 import android.app.Fragment;
 6 import android.os.Bundle;
 7 import android.view.LayoutInflater;
 8 import android.view.Menu;
 9 import android.view.MenuInflater;
10 import android.view.MenuItem;
11 import android.view.View;
12 import android.view.ViewGroup;
13 import android.os.Build;
14 
15 public class MainActivity extends Activity {
16 
17     final int ok=1;
18     final int cancle=2;
19     final int about=3;
20     @Override
21     protected void onCreate(Bundle savedInstanceState) {
22         super.onCreate(savedInstanceState);
23         setContentView(R.layout.activity_main);
24         
25         if (savedInstanceState == null) {
26             getFragmentManager().beginTransaction()
27                     .add(R.id.container, new PlaceholderFragment()).commit();
28         }
29     }
30 
31     @Override
32     public boolean onCreateOptionsMenu(Menu menu) {
33 
34         menu.add(0,ok,0,"开始");
35         menu.add(0,cancle,0,"取消");
36         Menu file=menu.addSubMenu(0,about,0,"关于");
37         
38         // Inflate the menu; this adds items to the action bar if it is present.
39         getMenuInflater().inflate(R.menu.menu, file);
40         return true;
41     }
42 
43     @Override
44     public boolean onOptionsItemSelected(MenuItem item) {
45         // Handle action bar item clicks here. The action bar will
46         // automatically handle clicks on the Home/Up button, so long
47         // as you specify a parent activity in AndroidManifest.xml.
48         int id = item.getItemId();
49         switch(id){
50         case ok:
51             this.setTitle("开始");
52             return true;
53         case cancle:
54             this.setTitle("取消");
55             return true;
56         case about:
57             this.setTitle("关于");
58             return true;
59         case R.id.help:
60             this.setTitle("帮助信息");
61             return true;
62         case R.id.our:
63             this.setTitle("联系我们");
64             return true;
65         
66         }
67 
68         return super.onOptionsItemSelected(item);
69     }
70 
71     /**
72      * A placeholder fragment containing a simple view.
73      */
74     public static class PlaceholderFragment extends Fragment {
75 
76         public PlaceholderFragment() {
77         }
78 
79         @Override
80         public View onCreateView(LayoutInflater inflater, ViewGroup container,
81                 Bundle savedInstanceState) {
82             View rootView = inflater.inflate(R.layout.fragment_main, container,
83                     false);
84             
85             
86             return rootView;
87         }
88     }
89 
90 }

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