Bdtjtk

I have 4 fragments. Following is the navigation flow

[Fragment 1] -> [Fragment 2] -> [Fragment 3]

[Fragment 4] -> [Fragment 3]

If user goes to fragment 3 from 4 (i.e [Fragment 4] -> [Fragment 3]) on back press of [Fragment 3] it should go to [Fragment 1].

I think if I am able to find the previous fragment then It will be easy to redirect to [fragment 1]. Is there any way I can find what was the previous fragment that has been replaced?

I have tried fragmentManager.getBackStackEntryAt(fragmentManager.backStackEntryCount - 1) but is shows only one entry that is of the current fragment.

Fragment manager looks like this.

FragmentManager Object

onBackPressed of Fragment 3 it I did something like this.

override fun onBackPressed(): Boolean {

    args.host.hideKeyboard()



    if (redirectToProductList) {

        args.host.activity?.let {

            if (it.supportFragmentManager.popBackStackImmediate(null, FragmentManager.POP_BACK_STACK_INCLUSIVE)) {

                openFirstFragment(it, SupportFragment(MainActivity.SalesRepProduct))

                return true

            }

        }

    }

    return args.host.childFragmentManager.popBackStackImmediate()

}

I have already posted this issue and Answer available there please try to search

Source :

Link

override fun onBackPressed() {

    if (tabLayout.selectedTabPosition != 0) {

        tabLayout.getTabAt(0)?.select()

    } else {

        super.onBackPressed()

    }

}

I resolved the problem. I was not adding fragment into backstack.

fragmentManager.beginTransaction()

            .addToBackStack(newFragment.javaClass.name)

            .commit()

I then found previous fragment like this.

override fun onBackPressed(): Boolean {

    args.host.hideKeyboard()

    val index = args.host.fragmentManager.backStackEntryCount - 2

    if (index >= 0) {

        val prevFrag = args.host.fragmentManager.getBackStackEntryAt(index)

        if (prevFrag.name == SearchContainerPresenter::class.java.name)

            args.host.activity?.let {

                if (it.supportFragmentManager.popBackStackImmediate(null, FragmentManager.POP_BACK_STACK_INCLUSIVE)) {

                    openFirstFragment(it, SupportFragment(MainActivity.SalesRepProduct))

                    return true

                }

            }

        else

            return args.host.childFragmentManager.popBackStackImmediate()

    }

    return args.host.childFragmentManager.popBackStackImmediate()

}

You can user listener like this,

supportFragmentManager.addOnBackStackChangedListener {

    val fragment = supportFragmentManager.findFragmentById(R.id.container)

    //Write your logic here

}