How to change label attribute of a destination in navigation controller?

问题

I am trying to use navigation controller in Android

as you can see in the image above, I set the label attribute of my destination to be 'Home'.

and this label, will show like title in my toolbar. can I change that label programatically ? because I want to set my toolbar title dynamically.

I have tried to change the toolbar title using toolbar.title = "some title here" but it will always be overlapped the title from that label.

so how to solve this ?

回答1:

Do it in your activity like below it's worked for me:

 setSupportActionBar(toolbar)
    val navController = findNavController(R.id.nav_controller_fragment)
    val appBarConfiguration = AppBarConfiguration(navController.graph)
    setupActionBarWithNavController(navController, appBarConfiguration)


    navController.addOnDestinationChangedListener { controller, destination, arguments ->
        when (destination.id) {
            R.id.mainFragment -> toolbar.title = "ok"
            else -> {
                toolbar.title = "General"
            }
        }
    }

or if you want to change from your fragment do like below:

 override fun onStart() {
    super.onStart()
    (activity as MainActivity).toolbar.title = "changed"
}

来源：https://stackoverflow.com/questions/54646720/how-to-change-label-attribute-of-a-destination-in-navigation-controller