CODEWITHSUNDEEP
androidionic-frameworkionic4ionic-native
Supinder Singh
Supinder Singh

Reputation: 31

Hardware back button doesn't the app on Android with Ionic 4

I am facing problem with the hardware back button on android. I am working with Ionic CLI 4.12.0 I want to exit the app when user on homePage and clicks back button. But back button event is not firing up. It navigate to login page then restarts the app. I am using Tabs template in my app. I have tried many answers of stackoverflow that claims solution to the similar problem. I have setup code in app component as following:



@ViewChild(IonRouterOutlet) routerOutlet: IonRouterOutlet;

  constructor(private platform: Platform){
      this.platform.backButton.subscribeWithPriority(0, () => {
      console.log("back button clicked");
      navigator["app"].exitApp();
})
}

Upvotes: 0

Views: 1576

Answers (2)

Dariusz Krempa
Dariusz Krempa

Reputation: 61

I have simple app with menu and this is my solution: 1) in app.components.ts i have hardware back button implemented to get back on every page:

constructor(
    private platform: Platform,
    private splashScreen: SplashScreen,
    private statusBar: StatusBar,
    private nav: NavController
  ) {
    this.initializeApp();
  }

initializeApp() {
    this.platform.ready().then(() => {
      this.statusBar.styleDefault();
      this.splashScreen.hide();
      this.platform.backButton.subscribeWithPriority(1, () => {
        this.nav.back();
      });
    });
  }

2) this additional code in home.page.ts is to close app with hardware back button(look at priority):

  ngOnInit() {
    this.platform.backButton.subscribeWithPriority(2, () => {
      console.log('BACK button pressed');
      navigator['app'].exitApp();
    });
  }

Upvotes: 1

Supinder Singh
Supinder Singh

Reputation: 31

Finally I found the answer of my question:


  ionViewDidEnter() {
    document.addEventListener("backbutton",function(e) {
      console.log("disable back button called from tab 1")
    }, false);
}

Upvotes: 0

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