Oreo: Alarm is not fired when Application is not running

问题

I have relatively simple setup that should trigger an alarm at certain time of the day and show a notification to user. here is relative code,

Setting the alarm

 long inTime = /*expirationTime*/ Calendar.getInstance().getTimeInMillis() + 10000;
 Intent startIntent = new Intent("parking.event");
 startIntent.setClass(getBaseContext(), ParkingExpirationWarmingBroadcast.class);
 PendingIntent startPendingIntent = PendingIntent.getBroadcast(this, 99, startIntent, 0);


 alarmMgr.setExact(AlarmManager.RTC_WAKEUP,
                inTime,
                startPendingIntent);

BroadcastReceiver registered

    <receiver
      android:name=".modules.parking.ParkingExpirationWarmingBroadcast"
      android:enabled="true">
        <intent-filter>
            <action android:name="parking.event" />
        </intent-filter>
    </receiver>

Broadcast Receiver

class ParkingExpirationWarmingBroadcast : BroadcastReceiver() {

    @SuppressLint("NewApi")
    override fun onReceive(context: Context, intent: Intent) {
    }
}

The receiver is only getting triggered if app is in background. as soon as i swipe the app from multitasking, the notification is cleared and no new Alarms are triggered. I checked this setup on Android 7.0 and BroadcastReceiver is triggered regardless of app running or not.

I am aware regarding restrictions over implicit broadcasts in Android Oreo but i don't believe the intent that i have mentioned above is considered implicit.

Can anyone point out what i am doing wrong?

回答1:

This is a general behavior of any Android's version. If you force-quit an application, then its Alarms and PendingIntents are deleted as well.

You can find the same answer here and here.

回答2:

Force closing an app destroys its components . This is what force stop does. It's not a bug, it is very much a feature. Follow the following thread , it has been discussed by android framework engineers . https://groups.google.com/forum/?fromgroups=#!topic/android-developers/anUoem0qrxU

来源：https://stackoverflow.com/questions/48204609/oreo-alarm-is-not-fired-when-application-is-not-running