An Android register back button action sample

Ionic Framework ionic-v3
1

I had posted this on another thread but the thread is dead. Just a simple example of handling the hardware back button, free of charge.

It was a somewhat frustrating process figuring it out so I hope it saves someone from a mild migraine.

I just take into account whether or not the app will exit from the page I’m setting the backButtonAction on. If so, I simply use return; as the action

export class HomePage {
private unRegisterBackButtonAction: Function;

 constructor() { }

ionViewDidLoad() {
 // Or on ionViewWillLoad
 this.registerAction();
}

registerAction(): void {
 if (this.platform.is('android')) {
     this.unRegisterBackButtonAction = this.platform.registerBackButtonAction(() => { 
     return;
  });
 }
}

unRegister() {
  this.unRegisterBackButtonAction && this.unRegisterBackButtonAction();
}

ionViewWillLeave() {
 this.unRegister();
}

If I want to pop navigation

registerAction(): void {
 if (this.platform.is('android')) {
     this.unRegisterBackButtonAction = this.platform.registerBackButtonAction(() => { 
     this.navCtrl.pop();
  });
 }
}

etc…

And I do add a new registerBack action to each page. I also do not use priority codes, no need to worry about them.