title: Ionic 3 badge not showing on iOS or Android
body: <p>I have a mobile app built on Ionic 3, using Firebase and FCM plugin to send notifications. </p>
  
  <p>I have 2 problems : </p>
  
  <ol>
  <li>The badge never appears (tested on iOs and Android) (but the notifications are working normally)</li>
  <li>When I click on the notification, I am re-directed to my application's home page. But I would like to be re-directed on a specific page of my application. Apparently, that should be specified by changing the "activity" on the "click_action" parameter, however my app doesn't have any activity.</li>
  </ol>
  
  <p>Thanks for your help.</p>
  
  <p>Here is my code : </p>
  
  <pre><code>  sendNotif(){
    this.postRequest()
    var headers = new Headers();
    headers.append("Accept", 'application/json');
    headers.append('Content-Type', 'application/json');
    headers.append('Authorization', 'key=xxxxx:xxxx')
    let options = new RequestOptions({ headers: headers });
    let postParams  = {
      "notification": {
        "title": "Mon-appli",
        "body": "Nouvelle réservation",
        "sound": "default",
        "click_action": "FCM_PLUGIN_ACTIVITY",
        "icon": "fcm_push_icon"
      },
      "data": {
        "param1": "value1",
        "param2": "value2"
      },
      "to": "/topics/all",
      "priority": "high",
      "restricted_package_name": ""
    }
  
    this.http.post("https://fcm.googleapis.com/fcm/send", postParams, options)
      .subscribe(data =&gt; {
        this.nb_notif = this.nb_notif +1; 
      }, error =&gt; {});      
  }
  </code></pre>