Question

我创建了一个小部件来显示每5-10秒刷新的当前日期（稍后会增加持续时间）。在onUpdate方法中创建一个警报，以创建服务的意图。创建了一个扩展广播接收器的onReceive方法来启动服务，然后使用日期更新小部件。当我调用onReceive小部件时最初触发并显示日期。之后警报不会触发。

1）我是否正确包含onReceive方法并调用startservice？ 2）我如何知道创建警报是否激活而不是触发？ 3）以下代码有什么问题？

请帮忙。

谢谢，Sam

  public class WorldCupScores extends AppWidgetProvider {
    public static String TAG = "myActivity";

    @Override
      public void onReceive(Context context, Intent intent) {
        Log.d(TAG, "receiveeeeeeeeeeee");
        Toast.makeText(context, "Receiver", Toast.LENGTH_LONG).show();
        context.startService(new Intent(context, UpdateService.class));
          super.onReceive(context, intent);
      }    

      @Override
      public void onUpdate(Context context, AppWidgetManager appWidgetManager,
          int[] appWidgetIds) {
          // To prevent any ANR timeouts, we perform the update in a service
          //context.startService(new Intent(context, UpdateService.class));
          AlarmManager alarmManager;
          Log.d(TAG, "before intenttttt");
          Intent intent = new Intent(context, UpdateService.class);
          Log.d(TAG, "afterrrr intenttttt");
          PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0,
                intent, 0);
          alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
          Calendar cal = Calendar.getInstance();
          cal.setTimeInMillis(System.currentTimeMillis());
          cal.add(Calendar.SECOND, 10);
          alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), 5*1000, pendingIntent);       
          Toast.makeText(context, "My alarm started", Toast.LENGTH_LONG).show();
          Log.d(TAG, "alarmmmmmmmm");
      }

      public static class UpdateService extends Service {
          @Override
          public void onStart(Intent intent, int startId) {

            Toast.makeText(this, "My Service Started", Toast.LENGTH_LONG).show();
            Log.d(TAG, "Inside Serviceeeeeeeeeeeeeeeeeeeee");
            // Build the widget update for today
              //RemoteViews updateViews = buildUpdate(this);
            RemoteViews updateViews = new RemoteViews(this.getPackageName(),
                    R.layout.main);

            Date date = new Date();

            updateViews.setTextViewText(R.id.scores, "Current Time "
                    + date);

              // Push update for this widget to the home screen
              ComponentName thisWidget = new ComponentName(this, WorldCupScores.class);
              AppWidgetManager manager = AppWidgetManager.getInstance(this);
              manager.updateAppWidget(thisWidget, updateViews);
              super.onStart(intent, startId);
          }
          @Override
          public IBinder onBind(Intent intent) {
              // We don't need to bind to this service
              return null;
          }
      }
  }

Answer 1

1）我是否正确包含onReceive方法并调用startservice？

我不会这样做。在您当前的代码中，永远不会调用onUpdate()，因为onReceive()永远不会链接到超类。

2）我如何知道创建警报是否处于活动状态且未触发？

如果没有开火，则不活动。并且，由于未调用onUpdate()，因此您的警报永远不会被安排。

Android：警报未触发以从服务更新Widget

1 个答案: