title: Firebase Push Notifications not working on Android 8 and above when app is closed
body: <p>Am working with Flutter and I have been looking for a fix for this for a while. At first I thought the notifications are not been received when the app is closed, but it worked on my Android 5 device.
  I have added this in my Android Manifest file already</p>
  
  <pre><code>        &lt;intent-filter&gt;
            &lt;action android:name="FLUTTER_NOTIFICATION_CLICK" /&gt;
            &lt;category android:name="android.intent.category.DEFAULT" /&gt;
          &lt;/intent-filter&gt; 
  </code></pre>
  
  <p>On the Android 8 and 9 devices i have with me, when I send any push notification from Firebase, i receive the notifications only when the app is running or if i minimize the app. But when the app is completely closed, i don't get the notification at all. Please a fix for this will be highly appreciated as it is the last feature i intend including before release.</p>
  
  <p>My intention is actually sending notifications to all users. I have tried using Flutter Local Notification package too but i receive it on only one device.</p>