Question

我是android和java开发的新手。目前，我有一个小任务，将电池信息通知为小部件。

我搜索了一下，找到了一段从电池中检索信息的源代码（http://www.tutorialforandroid.com/2009/01/getting-battery-information-on-android.html）。我尝试将其改编为小部件但我遇到了与 BroadcastReceiver 有关的问题。我试图将电池电量值从BroadcastReceiver传递给RemoteViews。我找到了BroadcastReceiver对象的getResultData（）方法，但我总是得到它的Null值。

因此，我想建议将此BroadcastReceiver值传递给RemoteViews。

为了更清楚，我在这里添加了一段代码。

public class MyBattery extends TimerTask {
    RemoteViews remoteViews;
    AppWidgetManager appWidgetmanager;
    ComponentName thisWidget;
    TextView contentTxt; 

    Context context;
    public MyBattery(Context context, AppWidgetManager appWidgetManager){
        this.appWidgetmanager = appWidgetManager;
        remoteViews = new RemoteViews(context.getPackageName(),R.layout.main);
        thisWidget = new ComponentName(context,widgetTest.class);
        this.context = context;
    }

    private BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver(){

        @Override
        public void onReceive(Context arg0, Intent intent){
            int level = intent.getIntExtra("level", 0);

            contentTxt.setText(String.valueOf(level)+"%");
            this.setResultData(String.valueOf(level)+"%");
        }
    };
    @Override
    public void run() {
        remoteViews.setTextViewText(R.id.battery_label,""+ this.mBatInfoReceiver.getResultData());
        appWidgetmanager.updateAppWidget(thisWidget, remoteViews);

    }


}

Answer 1

查看本教程，因为它将帮助您在BraodCastReceiver上构建您的概念：

http://www.vogella.de/articles/AndroidServices/article.html

Android BroadcastReceiver，getResultData（）始终返回null

1 个答案: