JAVA

android ancestral navigation

@Override
public boolean onOptionsItemSelected(@NonNull MenuItem item) {
  int itemId = item.getItemId();
  if (itemId == android.R.id.home) {
    // force up navigation to have the same behavior as temporal navigation
    onBackPressed();
    return true;
  } else {
    return super.onOptionsItemSelected(item);
  }
}

android ancestral navigation

    FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();       
    transaction.replace(R.id.container, fragment);      
    transaction.addToBackStack("NameOfFragment");
    transaction.commit();