3rd Fragment override 1st on backPress, when don't use addToBackStack in 2nd fragment

I open fragments like this: [1]+with addToBackStack) > [2](without addToBackStack) > [3]

in Fragment 3 when click onBackPress Button then 2nd is not visible but 3rd override 1.

If I use addToBackStack in 2nd fragment also, then everything is fine(No override issue).

> But I have to hide 2nd fragment when user visit 3rd fragment and
> direct come back to 1st fragment.

here is my code:

open root fragment[1] from activity with fragmentTransaction.add

FragmentManager fragmentManager = getSupportFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    fragmentTransaction.setCustomAnimations(R.anim.enter_from_right, R.anim.exit_to_right, R.anim.enter_from_right, R.anim.exit_to_right);
    fragmentTransaction.add(R.id.abbcHomeFragmentContainer, new FragmentHomeAbbc(), null);
    //fragmentTransaction.addToBackStack(null);
    fragmentTransaction.commit();

[1](with addToBackStack) >[2] :opening 2nd fragment

FragmentListOfBankAbbc fragment= new FragmentListOfBankAbbc();
fragment.setArguments(bundle);
if (getActivity()!=null){
    FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    fragmentTransaction.setCustomAnimations(R.anim.enter_from_right, R.anim.exit_to_right, R.anim.enter_from_right, R.anim.exit_to_right);
    fragmentTransaction.replace(R.id.abbcHomeFragmentContainer, fragment, null);
    fragmentTransaction.addToBackStack(null);
    fragmentTransaction.commit();
} else {
    Toast.makeText(getContext(), "Something went wrong (#201)", Toast.LENGTH_SHORT).show();
}

[2](without addToBackStack) > [3]

private void  funOpenFragments(Fragment fragment, Bundle bundle){
    fragment.setArguments(bundle);
    if (getActivity()!=null){
        FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.setCustomAnimations(R.anim.enter_from_right, R.anim.exit_to_right, R.anim.enter_from_right, R.anim.exit_to_right);
        fragmentTransaction.replace(R.id.abbcHomeFragmentContainer, fragment, null);
        //fragmentTransaction.addToBackStack(null);
        fragmentTransaction.commit();

    } else {
        Toast.makeText(getContext(), "Something went wrong (#202)", Toast.LENGTH_SHORT).show();
    }
}

Now open 3rd fragment and click showing 3rd fragment+1st fragment.

Try this

MainActivity.kt

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    binding = ActivityMainBinding.inflate(layoutInflater)
    setContentView(binding.root)
    loadFragment(FirstFragment())    // add this line
}


private fun loadFragment(fragment: Fragment) {
    val fragmentManager = supportFragmentManager
    val fragmentTransaction = fragmentManager.beginTransaction()
    fragmentTransaction.replace(R.id.frameLayout, fragment)
    fragmentManager.popBackStack()
    fragmentTransaction.commit()
}

FirstFragment.kt

 binding.btnNext.setOnClickListener {
        val fragmentManager = fragmentManager
        val fragmentTransaction = fragmentManager?.beginTransaction()
        fragmentTransaction?.add(R.id.frameLayout, SecondFragment(), getString(R.string.fragment_tag_title_second_fragment))
        fragmentTransaction?.addToBackStack("Second")
        fragmentTransaction?.commitAllowingStateLoss()
    }

SecondFragment.kt

private fun onClick() {
    binding.apply {
        btnNext.setOnClickListener { loadFragment(ThirdFragment()) }
        btnPrevious.setOnClickListener {   activity?.onBackPressed() }
    }
}

private fun loadFragment(fragment: Fragment) {
    val fragmentTransaction = fragmentManager?.beginTransaction()
    fragmentTransaction?.add(R.id.frameLayout, fragment,getString(R.string.fragment_tag_title_third_fragment))
    fragmentTransaction?.addToBackStack("third")
    fragmentTransaction?.commitAllowingStateLoss()
}

ThirdFragment.kt

 private fun onClick() {
    binding.apply {
        btnPrevious.setOnClickListener {
            activity?.onBackPressed()
        }
    }
}

When user go [1] > [2] > [3]

Then onBackPress user will be [3] > [1].

>Finally, I got Solution.
>> follow these 2 steps inside [2nd] fragment:
>
> Step1. Just add fragmentManager.popBackStack(); before fragmentTransaction mean calling [3] fragment. (after this line,
> It destroy/pop 2nd fragment and open 1st fragment again before open
> 3rd fragment. It mean when users press back button on 3rd fragment.
> then in recent fragment, there is 1st fragment not 2nd)
> Step2. add .addToBackStack(null) also with fragmentTransaction

[2] Fragment : here on button click we will open 3rd fragment .

if (getActivity()!=null){
    FragmentManager fragmentManager = getActivity().getSupportFragmentManager();

    //this popBackStack will close this [2]fragment.
    fragmentManager.popBackStack(); //<<<<<<<just add this before "fragmentTransaction".

    //now open [3]fragment here, Now in recent fragment is only [1]fragment not [2].
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
    fragmentTransaction.setCustomAnimations(R.anim.enter_from_right, R.anim.exit_to_right, R.anim.enter_from_right, R.anim.exit_to_right);
    fragmentTransaction.replace(R.id.abbcHomeFragmentContainer, fragment, null);
    fragmentTransaction.addToBackStack(null); //<<<<<<<<<add this also
    fragmentTransaction.commit();

} else {
    Toast.makeText(getContext(), "Something went wrong (#202)", Toast.LENGTH_SHORT).show();
}

(^_^) Happy Coding