android 2.0 以上 app_widget不支援每秒update一次

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"  
  android:minWidth="146dip"  
  android:minHeight="146dip"  
  android:updatePeriodMillis="1000"  
  android:initialLayout="@layout/analog_appwidget" >  
</appwidget-provider>  

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout
  android:id="@+id/LinearLayout01"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  xmlns:android="http://schemas.android.com/apk/res/android">
   
    <TextView
      android:id="@+id/TextView01"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="efefefefefef">
    </TextView>
</LinearLayout>

 
 <receiver android:name="AnalogAppWidgetProvider" >   
        <intent-filter>   
          <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />   
        </intent-filter>   
        <meta-data android:name="android.appwidget.provider"    
                   android:resource="@xml/analog_appwidget" />   
 </receiver>  
 

   
 //import省略   
public class AnalogAppWidgetProvider extends AppWidgetProvider { 
    
   Context context_main ; 
   AppWidgetManager app_manager; 
   int []appWidgetId; 
    
   @Override 
   public void onUpdate(Context context, AppWidgetManager appWidgetManager, 
     int[] appWidgetIds) { 
    super.onUpdate(context, appWidgetManager, appWidgetIds); 
     
    app_manager = appWidgetManager; 
    context_main = context; 
    appWidgetId = appWidgetIds; 
     
       Thread thread = new Thread(new update_thread()); 
       thread.start(); 
 
   } 
    
   public class update_thread implements Runnable{ 
    @Override 
    public void run() { 
     int i = 0; 
     while(true && i++ <100){ 
       RemoteViews views = 
 new RemoteViews(context_main.getPackageName(), R.layout.analog_appwidget); 
       views.setTextViewText(R.id.TextView01, String.valueOf(Math.random()) ); 
 
       app_manager.updateAppWidget(appWidgetId, views); 
     }       
    }      
   } 
 
}