I'm wondering which is the proper way to change Fragments, add them to backstack, and restore the visibile Fragment after a screen rotation.
Currently, I use this method to initialize the first Fragment:
private void inflateInitialFragment() {
FragmentManager manager = getFragmentManager();
Fragment mainFragment = manager.findFragmentByTag(MainMenuFragment.class.getSimpleName());
FragmentTransaction ft = manager.beginTransaction();
if (mainFragment == null) {
ft.replace(R.id.mainContainer, new MainMenuFragment(), MainMenuFragment.class.getSimpleName());
} else if (!(mainFragment.isAdded() && !mainFragment.isDetached() && !mainFragment.isRemoving())) {
ft.replace(R.id.mainContainer, mainFragment, MainMenuFragment.class.getSimpleName());
}
ft.commit();
manager.executePendingTransactions();
}
And then to display new Fragments I have methods like this one:
public void openAwards() {
getFragmentManager().beginTransaction().replace(R.id.mainContainer,
new AwardsFragment(), AwardsFragment.class.getSimpleName()).addToBackStack(null).commit();
}
And to go back to the main screen:
@Override
public void onBackPressed() {
if (getFragmentManager().getBackStackEntryCount() == 0) {
super.onBackPressed();
} else {
getFragmentManager().popBackStack();
}
}
After a few screen rotations, I've got crashes like this one:
java.lang.IllegalStateException: Fragment already added: MainMenuFragment{42c64d90 #0 id=0x7f0b003f MainMenuFragment}
How should I change the visible Fragments and restore them after a screen rotation?
I don't think that saving some string or Fragment each time is a good solution to restore them.
