Update notifications on background thread.

// FREEBIE

src/org/thoughtcrime/securesms/DatabaseUpgradeActivity.java

@@ -88,7 +88,7 @@ public class DatabaseUpgradeActivity extends BaseActivity {
           .execute(VersionTracker.getLastSeenVersion(this));
     } else {
       VersionTracker.updateLastSeenVersion(this);
-      MessageNotifier.updateNotification(DatabaseUpgradeActivity.this, masterSecret);
+      updateNotifications(this, masterSecret);
       startActivity((Intent)getIntent().getParcelableExtra("next_intent"));
       finish();
     }
@@ -123,6 +123,16 @@ public class DatabaseUpgradeActivity extends BaseActivity {
     }
   }
 
+  private void updateNotifications(final Context context, final MasterSecret masterSecret) {
+    new AsyncTask<Void, Void, Void>() {
+      @Override
+      protected Void doInBackground(Void... params) {
+        MessageNotifier.updateNotification(context, masterSecret);
+        return null;
+      }
+    }.execute();
+  }
+
   public interface DatabaseUpgradeListener {
     public void setProgress(int progress, int total);
   }
@@ -230,7 +240,7 @@ public class DatabaseUpgradeActivity extends BaseActivity {
     @Override
     protected void onPostExecute(Void result) {
       VersionTracker.updateLastSeenVersion(DatabaseUpgradeActivity.this);
-      MessageNotifier.updateNotification(DatabaseUpgradeActivity.this, masterSecret);
+      updateNotifications(DatabaseUpgradeActivity.this, masterSecret);
 
       startActivity((Intent)getIntent().getParcelableExtra("next_intent"));
       finish();