Dismiss notifications when notifications fragment is opened

app/src/main/java/com/keylesspalace/tusky/NotificationsFragment.java

@@ -15,6 +15,7 @@
 
 package com.keylesspalace.tusky;
 
+import android.app.NotificationManager;
 import android.content.Context;
 import android.graphics.drawable.Drawable;
 import android.os.Bundle;
@@ -70,6 +71,14 @@ public class NotificationsFragment extends SFragment implements
         super.onDestroy();
     }
 
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        NotificationManager notificationManager =
+                (NotificationManager) getActivity().getSystemService(Context.NOTIFICATION_SERVICE);
+        notificationManager.cancel(PullNotificationService.NOTIFY_ID);
+        super.onCreate(savedInstanceState);
+    }
+
     @Nullable
     @Override
     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,

app/src/main/java/com/keylesspalace/tusky/PullNotificationService.java

@@ -57,7 +57,7 @@ import retrofit2.Retrofit;
 import retrofit2.converter.gson.GsonConverterFactory;
 
 public class PullNotificationService extends IntentService {
-    private static final int NOTIFY_ID = 6; // This is an arbitrary number.
+    static final int NOTIFY_ID = 6; // This is an arbitrary number.
     private static final String TAG = "PullNotifications"; // logging tag and Volley request tag
 
     public PullNotificationService() {