Exit App develop using IONIC 3 from a specific page using Hardware Back Button

I try to Exit app from a specific page(HometabsPage) using Hardware Back Button. I use below code:

  var lastTimeBackPress = 0;
  var timePeriodToExit = 2000;

  platform.registerBackButtonAction(() => {
    let view = this.nav.getActive();
    if (view.component.name == 'SignInPage' ) {
      if (new Date().getTime() - lastTimeBackPress < timePeriodToExit) {
        platform.exitApp(); //Exit from app
      } else {
        this.common.presentToast("Press back again to exit App?", "bottom");
        lastTimeBackPress = new Date().getTime();
      }
    } else {
      this.nav.pop({});
    }
  });

In my application there is two section SignIn and Hometabs. Above code work fine on the SignIn page.

if (view.component.name == 'SignInPage' )

But I try "HometabsPage" instead of "SignInPage" after that in all pages show the toast message.

Please help me.

@Neotrixs After login, set HomeTabsPage as your Root Page. It will prevent your app from going back to LoginPage.
For Hardware Back Button,I did it by Following methods:

/* REGISTERING BACK BUTTON TO HANDLE HARDWARE BUTTON CLICKED */
  registerBackButton(){
    let backButton = this.platform.registerBackButtonAction(() => {
      var stackSize = this.nav.length();
      if(stackSize < 1)
        this.askForPressAgain();
      else
        this.nav.pop();  
    },1);

  }

  /*ASKING FOR PRESS BACK BUTTON AGAIN*/
  askForPressAgain(){
    let view = this.nav.getActive();
    if (view.component.name == 'ProjectsPage' || view.component.name == 'LoginPage') {
      if ((new Date().getTime() - this.lastTimeBackPress) < this.timePeriodToExit) {
        this.platform.exitApp(); //Exit from app
      } else {
        this.toast.showBottomToast(BACK_BTN_MESSAGE);
        this.lastTimeBackPress = new Date().getTime();
      }
    }

}

In the above code, at first I checked the Stack Size, if its less than 1, then showed the Toast for confirmation of leaving the app.
Hope it will help you or someone else.