LocalNotification with AlarmManager and BroadcastReceiver not firing up in Android O (oreo)

Android O are pretty new to-date. Hence, I try to digest and provide as accurate possible information.

From https://developer.android.com/about/versions/oreo/background.html#broadcasts

• Apps that target Android 8.0 or higher can no longer register broadcast receivers for implicit broadcasts in their manifest.
  • Apps can use Context.registerReceiver() at runtime to register a receiver for any broadcast, whether implicit or explicit.
• Apps can continue to register explicit broadcasts in their manifest.

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Also, in https://developer.android.com/training/scheduling/alarms.html , the examples are using explicit broadcast, and doesn’t mention anything special regarding Android O.

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May I suggest you try out explicit broadcast as follow?

public static void startAlarmBroadcastReceiver(Context context, long delay) {
    Intent _intent = new Intent(context, AlarmBroadcastReceiver.class);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, _intent, 0);
    AlarmManager alarmManager = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
    // Remove any previous pending intent.
    alarmManager.cancel(pendingIntent);
    alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + delay, pendingIntent);        
}

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AlarmBroadcastReceiver

public class AlarmBroadcastReceiver extends BroadcastReceiver {


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

}

In AndroidManifest, just define the class as

<receiver android:name="org.yccheok.AlarmBroadcastReceiver" >
</receiver>