Fragments not added to backstack using Navigation Components

Question

Information:

I\'m programmatically inserting a NavHostFragment for each feature of the app. Each NavHostFragment has it\'s own Navigation

Answer 1

Looks like a misunderstanding on my part (and a bug, also on my part).

If you loop through the fragments in the childFragmentManager it only ever shows the top-most fragment for some reason.

Example

val navHostFragment = supportFragmentManager
            .findFragmentByTag(getString(R.string.NavHostFragmentTag)) as NavHostFragment
val fragments = navHostFragment.childFragmentManager.fragments
for(fragment in fragments){
    // Only prints a single fragment, no matter the backstack size
}

However, if you print the backstack size like this, you will get the correct answer.

val navHostFragment = supportFragmentManager
            .findFragmentByTag(getString(R.string.NavHostFragmentTag)) as NavHostFragment
val backstackCount = navHostFragment.childFragmentManager.backStackEntryCount
println("backstack count: $backstackCount")

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At the end of the day this misunderstanding caused me to believe the fragments were not being added to the backstack. All is good.