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I implemented conditional navigation to my LoginFragment, with android navigation architecture component. The problem I facing now, is that I would like to hide the up button on the toolbar, and the disable any in-app navigation while the user is not logged in.
I would like to be able to implement this with a one-activity approach, where the Activity sets up the in app navigation UI and the navController like in the android sunflower demo, and the navigation destinations are Fragments.
I implemented the conditional navigation as discribed here: Navigation Architecture Component - Login screen
How can I properly implement hiding the navigation and the up button on the login screen, with Navigation Architecture Component?
270
The Navigation component contains a default NavHost implementation, NavHostFragment , that displays fragment destinations. NavController : An object that manages app navigation within a NavHost . The NavController orchestrates the swapping of destination content in the NavHost as users move throughout your app.
NavController manages app navigation within a NavHost . Apps will generally obtain a controller directly from a host, or by using one of the utility methods on the Navigation class rather than create a controller directly. Navigation flows and destinations are determined by the navigation graph owned by the controller.
Note: If your app uses multiple activities, each activity uses a separate navigation graph. To take full advantage of the Navigation component, your app should use multiple fragments in a single activity. However, activities can still benefit from the Navigation component.
The NavHostFragment for dynamic features. A host is a single context or container for navigation via a NavController . It is strongly recommended to construct the nav controller by instantiating a NavHostController , which offers additional APIs specifically for a NavHost.
I don't know exactly what you mean by hiding navigation, but I will assume you mean hiding a drawer layout. To hide the up button and lock the drawer add the following to your MainActivity's onCreate. I'm using Kotlin.
myNavController.addOnDestinationChangedListener { _, destination ->
if (destination.id == R.id.loginFragment) {
myDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED)
myToolbar.setVisibility(View.GONE)
} else {
myDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED)
myToolbar.setVisibility(View.VISIBLE)
}
To make just the up button go away use myToolbar.setNavigationIcon(null) and to make it come back use myToolbar.setNavigationIcon(R.id.my_icon)
85
My method is adding the login page to the root set
val navController = findNavController(R.id.main_nav_host)
val appBarConfiguration = AppBarConfiguration(setOf(R.id.home_dest,
R.id.user_dest,R.id.login_dest))
toolbar.setupWithNavController(navController, appBarConfiguration)
So when you are on the login page, there is no back button.
System back button can override onBackPressed()
override fun onBackPressed() {
if (findNavController(R.id.main_nav_host).currentDestination?.id != R.id.next_dest)
super.onBackPressed()
}
}
Sorry for my English
2
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