应用终止后未触发Android通知

Question

I am using alarm manager to set the time and fire a notification at that particular time. Works fine when app is foreground or background. I am testing on Android 8. However my problem is when app is killed from task manager, the notification is not fired because the broadcast does not work. This is because I register receiver in onCreate() of MainActivity and unregister receiver in onDestroy(). Maybe it would work if I register my broadcast receiver in manifest but it is not allowed from Android 8 onwards. How do I address this problem that I receive the broadcast even when app is killed?

Answer 1

BroadCastREceiver Example

 public class SchedulerMailBroadcastReceiver extends BroadcastReceiver{ @Override public void onReceive(Context context, Intent intent) { try { Log.i("scheduler: " + new DateWrapper().getLocaleString()); PowerManager pm = (PowerManager) context.getApplicationContext().getSystemService(Context.POWER_SERVICE); PowerManager.WakeLock wl = null; if (pm != null) { Log.d("aquire wakelog"); wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "ics:mailScheduler"); wl.acquire(10000); } startInNewThread(context.getApplicationContext(),wl); }catch(Exception e){ Log.e(e); } } public void startInNewThread(final Context context, PowerManager.WakeLock wl){ new ThreadWrapper(() -> { try { //Do Stuff }catch(Exception e){ Log.e(e); }finally { Log.d("releasing wakelog"); try { wl.release(); Log.i("released wakelog"); }catch(Exception e){ Log.e("wakelog release","exception on releasing wawkelog"); } } }).start(); } public static boolean registerScheduler(Context context){ final int requestCode=1234; Intent intent = new Intent(context, SchedulerMailBroadcastReceiver.class); intent.setAction("startScheduler"); PendingIntent pendingIntent = PendingIntent.getBroadcast(context, requestCode, intent, PendingIntent.FLAG_UPDATE_CURRENT); AlarmManager alarmManager =( AlarmManager)context.getSystemService(Context.ALARM_SERVICE); if (alarmManager != null) { // alarmManager.cancel(previousPendingIntent); alarmManager.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime(), 1000 * 60*15, pendingIntent); Log.i("registered repeating"); } return true; } } 

you probably dont want setRepeating though

JobService example

 public class SchedulerMailJobManager extends JobService{ @Override public boolean onStartJob(JobParameters params) { try { Log.i("SchedulerMailJobManager","scheduler run at "+ new DateWrapper().getLocaleString()); startInNewThread(getApplicationContext(),params); return true; }catch(Exception e){ Log.e("SchedulerMailJobManager","errpr in starting new thread",e); return false; } } @Override public void onDestroy(){ Intent intent = new Intent(this,ServiceRestarter.class); intent.setAction("restartService"); intent.putExtra("service","mailScheduler"); sendBroadcast(intent); } @Override public boolean onStopJob(JobParameters params) { Log.w("stoppedJob","stopped"); return true; } public void startInNewThread(final Context context,final JobParameters params){ new ThreadWrapper(() -> { try { //Do Stuff }catch(Exception e){ Log.e("JobScheduler2ndThread","Exception",e); }finally { if(params!=null) { this.jobFinished(params,false); }else{ Log.e("JobScheduler2ndThread","no params for jobFinished"); } } }).start(); } static JobInfo createScheduledJob(Context context){ ComponentName serviceComponent = new ComponentName(context,SchedulerMailJobManager.class ); JobInfo.Builder builder=new JobInfo.Builder(1234,serviceComponent); int waitMin=30; builder.setRequiredNetworkType(JobInfo.NETWORK_TYPE_ANY); builder.setPersisted(true); builder.setPeriodic(1000*60*waitMin,1000); return builder.build(); } public static boolean registerScheduler(Context context){ JobScheduler scheduler=context.getSystemService(JobScheduler.class); if(scheduler==null){ Log.e("registerScheduler","scheduler is null"); return false; } if(scheduler.getPendingJob(1234)!=null) { scheduler.cancel(1234); Log.i("registerScheduler","cancelled previous"); } int resultCode=scheduler.schedule(createScheduledJob(context)); if(resultCode==JobScheduler.RESULT_SUCCESS){ Log.i("JobManagerScheduler","registered new scheduler"); return true; }else{ Log.e("registerScheduler","failed registering"); return false; } } } 

since you only have a Notification you probably dont need to start anything in a new thread which means in this solution you should return false in OnStartJob