How can I kill all the Activities of my application?
I tried using this.finish() but it just kills one Activity.
In fact, I would like when the user touches the back button (in only one of the activities), the application to do the same as if he pressed the Home button.
You can set android:noHistory="true" for all your activities at AndroidManifest.xml. Hence they will not place themselves onto history stack and back button will bring you to the home screen.