如何在android中動態添加菜單項？

Question

我寫了一個小程序，TP實踐添加菜單項動態地根據官方文檔，它只是不工作：
主要活動：

public class MainActivity extends Activity { 

    private MenuInflater mi; 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     super.onCreateOptionsMenu(menu); 
     Intent intent = new Intent(); 
     mi = getMenuInflater(); 
     mi.inflate(R.menu.opt, menu); 
     intent.addCategory(Intent.CATEGORY_ALTERNATIVE); 
     menu.addIntentOptions(Menu.CATEGORY_ALTERNATIVE, 
           3, 
           0, 
           this.getComponentName(), 
           null, 
           intent, 
           0, 
           null); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     return super.onOptionsItemSelected(item); 
    } 

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main);   
    }  
} 

和DestActivity是：

public class DestActivity extends Activity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
    } 

} 

的manifest.xml中：

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
     package="com.app.alex.testadd" 
     android:versionCode="1" 
     android:versionName="1.0"> 
    <uses-sdk android:minSdkVersion="3" /> 

    <application android:icon="@drawable/icon" android:label="@string/app_name"> 
     <activity android:name=".MainActivity" 
        android:label="@string/app_name"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 
       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 
     <activity android:name=".DestActivity" 
        android:label="@string/app_name"> 
      <intent-filter> 
       <category android:name="android.intent.category.ALTERNATIVE" /> 
      </intent-filter> 
     </activity> 

    </application> 
</manifest> 

在此先感謝....

Answer 1

試試吧，爲我的作品：

package com.learn.menu; 

import android.app.Activity; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.Menu; 
import android.view.MenuItem; 

public class TestActivity extends Activity { 

    private static final int UPDATE_DATA = 0; 
    private static final int ADD_NEW = 1; 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu){ 

     menu.add(0,UPDATE_DATA,0,"Update Information"); 
     menu.add(0,ADD_NEW,1,"Add New Inspection"); 

     return true; 
    } 
    public boolean onOptionsItemSelected (MenuItem item) 
    { 
     switch(item.getItemId()) 
     { 
      case(UPDATE_DATA): 
       Log.d("tag", "update"); 
       break; 
      case(ADD_NEW): 
       Log.d("tag", "Add"); 
       break; 
      } 
     return false; 
     } 
}