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

Question

I've got my local notifications running on androids prior to SDK 26

But in a Android O I've got the following warning, and the broadcast receiver is not fired.

W/BroadcastQueue: Background execution not allowed: receiving Intent { act=package.name.action.LOCAL_NOTIFICATION cat=[com.category.LocalNotification] flg=0x14 (has extras) } to package.name/com.category.localnotifications.LocalNotificationReceiver

From what I've read broadcast receivers are more restricted in android O, but if so, how should I schedule the broadcast if I want it launching even if the main activity is not running?

Should I use services instead of receivers?

This is the AlarmManager launch code:

public void Schedule(String aID, String aTitle, String aBody, int aNotificationCode, long aEpochTime)
{
    Bundle lExtras = new Bundle();
    lExtras.putInt("icon", f.getDefaultIcon());
    lExtras.putString("title", aTitle);
    lExtras.putString("message", aBody);
    lExtras.putString("id", aID);
    lExtras.putInt("requestcode", aNotificationCode);

    Intent lIntent = 
      new Intent(LocalNotificationScheduler.ACTION_NAME)
      .addCategory(NotificationsUtils.LocalNotifCategory)
      .putExtras(lExtras);

    PendingIntent lPendIntent = PendingIntent.getBroadcast(f.getApplicationContext(), aNotificationCode,
                                                           lIntent, PendingIntent.FLAG_UPDATE_CURRENT);

    AlarmManager lAlarmMgr = (AlarmManager) f.getSystemService(Context.ALARM_SERVICE);
    lAlarmMgr.set(AlarmManager.RTC, 1000, lPendIntent);
}

This is the receiver code:

public class LocalNotificationReceiver extends BroadcastReceiver {

public static native void   nativeReceiveLocalNotification (String aID, String aTitle, String aMessage, boolean aOnForeground );

/** This method receives the alarms set by LocalNotificationScheduler,
*   notifies the CAndroidNotifications c++ class, and (if needed) ships a notification banner 
*/
@Override
public void onReceive(Context aContext, Intent aIntent)
{
    Toast.makeText(context, text, duration).show();
}

}

Android manifest:

<receiver android:name="com.category.localnotifications.LocalNotificationReceiver">
        <intent-filter>
            <action android:name="${applicationId}.action.LOCAL_NOTIFICATION" />
            <category android:name="com.category.LocalNotification" />
        </intent-filter>
    </receiver>

Answer 1

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.

---

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.

---

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);        
}

---

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>