Phisical Back Key doesn't terminate the app and doesn't go to main page

Question

Hi experts
I'm working in a Windows Phone 8.1 Project and have created it from a WP blank page (XAML and C#). After that added a new blank page and I navigate from main page through a blank page using a button. Now I'm struggling to navigate between pages.
If I'm at main page and press the phisical back key button of my cellphone, my app doesn't terminate, instead it goes to background.
If I'm at blank page and press the phisical back key button of my cellphone, my app doesn't go back to main page, instead it goes to background.
I have tried several methods from internet (most of them using silverlight which is not my case) but I didn't understand how to create an event handler to deal with that.
Any help will be very valuable, trust me.
Thank you
Arcturus

Answer 1

You need to handle the HardwareButtons.BackPressed event
and plug into your app's navigation system. Commonly you'll find the Frame object, check if frame.CanGoBack, and if so call frame.GoBack. If you're at the app's front page (frame.CanGoBack is false) then don't handle the event and let it back out of the application.
private void HardwareButtons_BackPressed(object sender, BackPressedEventArgs e)
Frame frame = Window.Current.Content as Frame;
if (frame == null)
return;
if (frame.CanGoBack)
frame.GoBack();
e.Handled = true;
See Handling the Back button
in a Windows Phone app
The NavigationHelper.cs classes in the non-blank Windows Phone app templates will hook this up for you.