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

Question

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.

Can you please try rephrasing your question? It is unclear what behavior you do not want during onBackPressed() in the cases of (a) adding 2nd fragment w/o addToBackstack and (b) adding 2nd fragment with addToBackstack — Prajjwal Srivastav, Apr 17 '23 at 07:18
when user goto [3rd fragment] , then on backpress user will see [1st fragment] not [2nd]. So, Now error is [3rd fragment]'s content showing on [1st fragment] mean override. I dont want override. — TexD, Apr 17 '23 at 07:23
You can try to override `onBackPressed` of your 3rd fragment to safely remove the 3rd and 2nd fragments and go to the 1st fragment. — Prajjwal Srivastav, Apr 17 '23 at 07:44

score 1 · Answer 1 · answered Apr 17 '23 at 09:43

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()
        }
    }
}

score 0 · Accepted Answer · answered Apr 29 '23 at 18:23

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

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

2 Answers2