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kotlinlang

Hi there, did anyone use this guy before? <https://github.com/android/architecture-components-samples/blob/master/NavigationAdvancedSample/app/src/main/java/com/example/android/navigationadvancedsample/NavigationExtensions.kt>

Im trying to use it with a custom toolbar per fragment, the back button is not showing up. Did anyone use this with custom toolbar in their fragments successfully?

I did use a toolbar in the fragments, but to get the back button to show up I had to explicitly set the setDisplayHomeAsUpEnabled(true) for the fragments I wanted to provide that interaction.

```(view.context as? AppCompatActivity)?.supportActionBar?.setDisplayHomeAsUpEnabled(true)```


but for some reason, the back button shows, but when clicking on it nothing happens

In the activity that is hosting the fragment, you would need to override the onSupportNavigateUp() method.

If you are using a "tabbed" activity each with their own navigation graph (like in that example github project) it would look like this:

```override fun onSupportNavigateUp(): Boolean {
    return currentNavController?.value?.navigateUp() ?: false
}```


In your fragment with the toolbar, are you overriding "onOptionsItemSelected"?

```override fun onOptionsItemSelected(item: MenuItem): Boolean =
    when (item.itemId) {
        android.R.id.home -&gt; {
            findNavController().popBackStack()
            true
        }
        else -&gt; super.onOptionsItemSelected(item)
    }```


so you are handling the navigate up there. If that is the only thing you are looking for in that method, I would just comment it out.

```val appBarConfiguration = AppBarConfiguration(setOf(R.id.home_tab))

this@HomeTabFragment.binding.toolbar.setupWithNavController(findNavController(), appBarConfiguration)```


I have let the activity handle the navigation.
In the fragment, I just set the support action bar  in the activity with the toolbar from the fragment.

```//Setup the Toolbar
toolbar = view.findViewById(R.id.toolbar)
toolbar?.let {
    (activity as? AppCompatActivity)?.setSupportActionBar(toolbar)
}```


if i add
```toolbar.setupWithNavController(findNavController())```


in the fragment after the setSupportActionBar

now i have trouble to have the hamburger menu open the navdrawer

and i did call
```setupActionBarWithNavController(navController, binding.sidebarDrawerLayout)```


Im not sure I can help you much on that path, I haven't had much interaction with Drawer Layout recently.

no worries, thank you so much for the help! i wasnt sure if setting the support action bar was the right approach...but its seems is the only one that works