Skip some fragments onBackPressed

Question

I am fairly new with android fragments so please bear with me.

I have a bunch of fragments using a single activity as host.

In my mind, my fragments are grouped

Answer 1

When you display Frag2 use:

final FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.addToBackStack(FRAG_2);
fragmentTransaction.replace(containerID, frag2, FRAG2_TAG);

and on back press:

@Override
public void onBackPressed() {
   final Frag2 frag2 = (Frag2)getSupportFragmentManager().findFragmentByTag(FRAG2_TAG);
   if (frag2 != null && frag2.isVisible() && getSupportFragmentManager().getBackStackEntryCount() > 0) {
    getSupportFragmentManager().popBackStackImmediate();
    return;
   }
}

This will prevent from frag2 to be displayed after onBackPressed() called. Avoid using popBackStack() as this will results in frag2 lifecycle trigger (onCreate, onStart, onResume ...)