广播修改widget

public void modifyPower(){
		// 从layout下main.xml中构造widgets
		if(views==null)views = new RemoteViews(getPackageName(), R.layout.main); 
		// 这里我们应该判断currentBatteryLevel的数值来显示图片电量等级，比如battery_level_1或battery_level_5等等，下面是n
		if(this.currentBatteryLevel >= 60){
			views.setImageViewResource(R.id.my_widget_img,R.drawable.bh1);
		}else if(this.currentBatteryLevel >= 20){
			views.setImageViewResource(R.id.my_widget_img,R.drawable.bh2);
		}else if(this.currentBatteryLevel > 10){
			views.setImageViewResource(R.id.my_widget_img,R.drawable.bh3);
		}else{
			views.setImageViewResource(R.id.my_widget_img,R.drawable.bh4);
		}
		views.setTextViewText(R.id.my_widget_tv, currentBatteryLevel + " %"); // 从BroadcastReceiver读取当前的电量等级

		ComponentName thisWidget = new ComponentName(this,PowerTip.class);
		AppWidgetManager manager = AppWidgetManager.getInstance(this);
		manager.updateAppWidget(thisWidget, views); // 开始执行了
	}