Android Widget更新

Question

基于本教程, 我创建了一个应该显示时间的小部件.java方式有效,但服务方式没有.

HelloWidget.java:

public class HelloWidget extends AppWidgetProvider {

    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {

        Intent intent = new Intent(context, UpdateService.class);
        context.startService(intent);
    }
}

UpdateService.java:

public final class UpdateService extends Service {
    @Override
    public void onStart(Intent intent, int startId) {
        RemoteViews updateViews = new RemoteViews(this.getPackageName(), R.layout.main);

        Date date = new Date();
        java.text.DateFormat format = SimpleDateFormat.getTimeInstance(
                SimpleDateFormat.MEDIUM, Locale.getDefault());
                updateViews.setTextViewText(R.id.widget_textview, "Current Time " + format.format(date));

        ComponentName thisWidget = new ComponentName(this, HelloWidget.class);
        AppWidgetManager manager = AppWidgetManager.getInstance(this);
        manager.updateAppWidget(thisWidget, updateViews);
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }
}

该hello_widget_provider.xml有该行:android:updatePeriodMillis="1000"

问题:

小部件显示当前时间但它没有更新(java方式).

我的主要目标是每天18:56更新小部件.Idk如果这是好方法,但我尝试修改onUpdate方法,如下所示,但它有ALARM_SERVICE的问题:ALARM_SERVICE无法解析为变量

public class HelloWidget extends AppWidgetProvider {

    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {

        AlarmManager alarmManager;
        Intent intent = new Intent(context, AlarmReceiver.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0,
          intent, PendingIntent.FLAG_UPDATE_CURRENT);
        alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.HOUR_OF_DAY, 18);
        cal.set(Calendar.MINUTE, 56);
        cal.set(Calendar.SECOND, 0);
        cal.set(Calendar.MILLISECOND, 0);
        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), 86400, pendingIntent);
   }
}

任何帮助表示赞赏.

Answer 1

回想起我问过这个问题的时间让我意识到我在过去的一年中学到了多少.

由于我刚刚在过去两周内使用了一个小部件,我刚刚找到了这个未解决的问题,我决定解决它.我希望它能帮助别人.

AppWidgetProvider应如下所示:

public class MyWidget extends AppWidgetProvider {

    public static String ACTION_WIDGET_CONFIGURE = "ConfigureWidget";
    public static String ACTION_WIDGET_RECEIVER = "ActionReceiverWidget";
    private PendingIntent service = null;  

       @Override
       public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {


           final AlarmManager m = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);

           final Calendar TIME = Calendar.getInstance();
           TIME.set(Calendar.MINUTE, 0);
           TIME.set(Calendar.SECOND, 0);
           TIME.set(Calendar.MILLISECOND, 0);

           final Intent i = new Intent(context, MyService.class);

           if (service == null)
           {
               service = PendingIntent.getService(context, 0, i, PendingIntent.FLAG_CANCEL_CURRENT);
           }

           m.setRepeating(AlarmManager.RTC, TIME.getTime().getTime(), 1000 * 1, service);

    }

      @Override
       public void onDeleted(Context context, int[] appWidgetIds) {
               super.onDeleted(context, appWidgetIds);
       }

       @Override
       public void onDisabled(Context context) {
               super.onDisabled(context);

               final AlarmManager m = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);  
               if (service != null)
               {
                   m.cancel(service);
               }
       }

       @Override
       public void onEnabled(Context context) {
               super.onEnabled(context);
       }

       @Override
       public void onReceive(Context context, Intent intent) {

         super.onReceive(context, intent);

       }

}

服务:

public class MyService extends Service
{
    @Override
    public void onCreate()
    {
        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId)
    {
        buildUpdate();

        return super.onStartCommand(intent, flags, startId);
    }

    private void buildUpdate()
    {
        String lastUpdated = DateFormat.format("hh:mm:ss", new Date()).toString();

        RemoteViews view = new RemoteViews(getPackageName(), R.layout.widget_layout);
        view.setTextViewText(R.id.btn_widget, lastUpdated);

        ComponentName thisWidget = new ComponentName(this, MyWidget.class);
        AppWidgetManager manager = AppWidgetManager.getInstance(this);
        manager.updateAppWidget(thisWidget, view);
    }

    @Override
    public IBinder onBind(Intent intent)
    {
        return null;
    }
}

另外,在Manifest中注册提供者和服务:

<receiver android:name="MyWidget" android:label="Tutorial_Widget 1x1">
            <intent-filter>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
                <action android:name="com.something.MyWidget.ACTION_WIDGET_RECEIVER"/>
            </intent-filter>    
            <meta-data android:name="android.appwidget.provider" android:resource="@xml/widget_info"/>
        </receiver>

         <service android:enabled="true" android:name=".MyService" />