Back button on Android Phones

Question

A couple questions about the back button (as seen on the emulator)...

1) Do all Android phones have the back button as a hard, tactile button?

2) If so, is it still recommended to put a back button in your software?

3) Is it possible to change the animation between activities when this back button is pressed? I would like it to be consistent with the animations in my app.

Answer 1

1) All Android phones have a dedicated BACK button. It is not always a "hard, tactile" button.

2) It is never recommended to put a BACK button in your software.

3) Reportedly, yes, but I do not have the answer handy, sorry.