Question

为什么我的通知有时不会显示？

我在MainActivity中创建setRecurringAlarm(this);，我想使用此代码每30分钟显示一次通知

这是我的代码：

private void setRecurringAlarm(Context context) {
    Log.d("MyService", "setRecurringAlarm() activated...");
        Calendar updateTime = Calendar.getInstance();
        updateTime.setTimeZone(TimeZone.getDefault());
        updateTime.set(Calendar.HOUR_OF_DAY, 12);
        updateTime.set(Calendar.MINUTE, 30);
        Intent downloader = new Intent(context, MyStartServiceReceiver.class);
        downloader.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, downloader, PendingIntent.FLAG_CANCEL_CURRENT);
        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, updateTime.getTimeInMillis(), AlarmManager.INTERVAL_FIFTEEN_MINUTES, pendingIntent);
   }

这是我的MyStartServiceReceiver：

public class MyStartServiceReceiver extends BroadcastReceiver {
       @Override
        public void onReceive(Context context, Intent intent) {
        Intent dailyUpdater = new Intent(context, MyService.class);
        context.startService(dailyUpdater);
        Log.d("AlarmReceiver", "Called context.startService from AlarmReceiver.onReceive");
       }
    }

这是我的MyService：

public class MyService extends IntentService {
    public MyService() {
       super("MyServiceName");
    }
    @Override
    protected void onHandleIntent(Intent intent) {
        Log.d("MyService", "Execute MyTask");
        new MyTask().execute();
        this.sendNotification(this);
    }
    private class MyTask extends AsyncTask<String, Void, Boolean> {
        @Override
         protected Boolean doInBackground(String... strings) {
               Log.d("MyService", "Calling doInBackground() in MyTask");
               return false;
        }
    }        
    @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
    private void sendNotification(Context context) {
        Log.d("MyService", "Execute sendNotification()");
        // here is my notification code --> http://stackoverflow.com/questions/20558619/how-to-set-notification-to-clear-itself-on-click  

     }
}

Answer 1

您在IntentService中没有使用唤醒锁。由于BroadcastReciever会立即返回，因此您的手机无法保证清醒。您需要在IntentService

中使用唤醒锁

检查出来

AlarmManager.setRepeating - Service does not seem to repeat

有时我的通知没有显示

1 个答案: