Android - Custom back button (back stack) - android-activity

Question

I have implemented my own back stack but I'm not sure what is wrong or what I could improve, my scenario: I have a project with 2 activities, the first one is the "SplashActivity" - where I load some network data - the second one, the MainActivity.
Inside of my MainActivity I have a fragment and inside of this fragment a webview.
The back button should behave like:
When the user doesn't navigate inside of my webview, close the app.
When the user navigates in webview, use the back history of the browswer.
Here is my code:
#Override
public void onBackPressed() {
Log.d("lastfragment", String.valueOf(fragmentStack.lastElement().getId()));
if (fragmentStack.size() >= 2) {
// implement normal behavior?
Fragment activeFragment=fragmentStack.lastElement();
FragmentTransaction ft = getFragmentManager().beginTransaction();
activeFragment.onPause();
ft.remove(fragmentStack.pop());
Fragment returnToFragment=fragmentStack.lastElement();
String name = returnToFragment.getClass().getName();
if(name=="SplashScreen" || name=="LoginFragment"){
// close?
}
else {
// implement normal behavior?
returnToFragment.onResume();
ft.show(returnToFragment);
ft.commit();
}
}
else {
//close ??
}
}

Answer 1

Try to this code i hope solved this your problem.
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(FragmentTransaction.TRANSIT_FRAGMENT_OPEN, YOUR_FRAGMENT_OBJECT);
fragmentTransaction.addToBackStack(null); // Your fragment add to back stack
fragmentTransaction.commit();