Hardware back button exit the app in mobile device?

Ionic Framework ionic-v3
2

i don’t know what you exactly want but in my app this code work perfactly with linear navigation…

add this in constructor

private app: App

 platform.registerBackButtonAction(() => {
        const overlayView = this.app._appRoot._overlayPortal._views[0];
        if (overlayView && overlayView.dismiss) {
          overlayView.dismiss();
          return;
        }
        if (this.nav.canGoBack()) {
          this.nav.pop();
        }
        else {
          let view = this.nav.getActive();
          if (view.component == DashboardPage || view.component == LoginPage) {
            if (this.alert) {
              this.alert.dismiss();
              this.alert = null;
            } else {
              this.platform.exitApp();
              //this.showAlert();
            }
          }
        }
      });
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