Ionic 2 execute method when user leaves the app

Question

I'm trying to execute a method when the user leaves the app. I tried everything:

ionViewWillUnload() {
  console.log("Wlill unload");
  this.leaveRoom();
}

onDestroy() {
  console.log("DESTROY");
  this.leaveRoom();
}

ionViewWillLeave() {
  this.leaveRoom();
}

Unfortunetly they are not executed when user closes the app or when the user refresh the page.

Any idea?

Answer 1

1. Import Platform:

   import { Platform } from 'ionic-angular';

2. Add Platform to the constuctor:

   constructor(public navCtrl: NavController, platform: Platform)

3. subscribe to the platform pause and resume:

        platform.ready().then(() => {
           this.platform.pause.subscribe(() => {
               console.log('[INFO] App paused');
           });
   
           this.platform.resume.subscribe(() => {
               console.log('[INFO] App resumed');
           });
       });