Android菜单应用（Menu）

整体运行效果如下图：

Android菜单应用（Menu）

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：

1 <?xml version="1.0" encoding="utf-8"?>2 <menu xmlns:android="http://schemas.android.com/apk/res/android" >3     <item4         android:id="@+id/help"5         android:title="帮助"/>"6     <item7         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     @Override21     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     @Override32     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     @Override44     public boolean onOptionsItemSelected(MenuItem item) {45         // Handle action bar item clicks here. The action bar will46         // automatically handle clicks on the Home/Up button, so long47         // 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         @Override80         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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