如何从 DialogFragment 获取 backstack 中的顶部 Fragment

Question

I'm using navigation to navigate between fragments.

And I have a DialogFragment, it can called from from many fragment like this:

 val dialog = FragmentDialog
 dialog.show(childFragmentManager, "home_fragment")

And I want to know dialogfragment called by which fragment

I tried with FragmentManager.backStackEntryCount but it's seem doesn't work

Can I have a advice for this problem???

Answer 1

can you explain why you need to know dialogfragment called by which fragment

 fun showInAppDialog() {
        val mInAppFragment: InAppScreenFragmentDialog = 
        InAppScreenFragmentDialog.instance
        supportFragmentManager.beginTransaction().add(mInAppFragment, 
        "IN_APP_DIALOG")
        .commitAllowingStateLoss()
    
    }

  private fun dismissInAppDialog() {
        if (isFinishing) return
        val manager: FragmentManager = supportFragmentManager
        val mInAppFragment: InAppScreenFragmentDialog? =
            manager.findFragmentByTag("IN_APP_DIALOG") as InAppScreenFragmentDialog?
        if (mInAppFragment!= null) {
            supportFragmentManager.beginTransaction().remove(mInAppFragment).commitAllowingStateLoss()
        }
}

Answer 2

There are multiple ways to do this..

1. You can just Pass a key in Bundle to your DialogFragment to check which Fragment opened it..

2. If your Dialog fragment a attached to a fragment in each case you can just use getParentFragment() . getParentFragment() will return the instance of that fragment. If its attached to activity then getParentFragment() will be null so watch out for this case also.

3. you can also use getTag() from where it was open byt passing different tags to transaction.