How to always start from a startup activity on Android?

Question

There are three different cases:

1) A user launches an app, navigates in it, pressed home and click on the app icon again to launch our app again.

2) A user

Answer 1

I know you don't want to manage it in all activities but you can do this and still handle the code in one place with a super activity

public abstract class BlundellActivity extends Activity {
     @Override
     public void onPause(){
         // Whatever strategy you want
     }
}

public class SomeActivity extends BlundellActivity {
     // Do whatever you normally want to do
}

public class SomeActivity extends BlundellActivity {
     // Do whatever you normally want to do here as well
}