In my application I have an OptionsMenu which is used by many Fragments. Therefore I created the following BaseFragment:
abstract class BaseFragment : Fragment() {
private lateinit var navController: NavController
protected fun askForPermissions(permissionRequestCode: Int, vararg permissions: String) {
requestPermissions(permissions, permissionRequestCode)
}
protected fun checkPermission(permission: String, activity: Activity): Boolean = when {
Build.VERSION.SDK_INT < Build.VERSION_CODES.M -> true // It is not needed at all as there were no runtime permissions yet
else -> ContextCompat.checkSelfPermission(activity, permission) == PackageManager.PERMISSION_GRANTED
}
override fun onCreateOptionsMenu(menu: Menu?, inflater: MenuInflater?) {
inflater!!.inflate(R.menu.menu_topbar, menu)
@SuppressLint("RestrictedApi")
if (menu is MenuBuilder) {
menu.setOptionalIconsVisible(true)
}
super.onCreateOptionsMenu(menu, inflater)
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
navController = Navigation.findNavController(view!!)
return when (item.itemId) {
R.id.menu_topbar_profile -> {
navController.navigate(actionBaseToProfile())
true
}
R.id.menu_topbar_favorites -> {
navController.navigate(actionBaseToFavorites())
true
}
R.id.menu_topbar_help -> {
navController.navigate(actionBaseToHelp())
true
}
else -> false
}
}
}
And in the navigation file I added the BaseFragment and the target Fragments. Here is a snippet:
<fragment
android:id="@+id/fragment_base"
android:name="com.test.scanner.base.BaseFragment">
<action
android:id="@+id/action_base_to_profile"
app:destination="@id/fragment_profile" />
</fragment>
<fragment
android:id="@+id/fragment_profile"
android:name="com.test.scanner.ui.profile.ProfileFragment"
tools:layout="@layout/fragment_profile" />
As you can see I don't defined a layout for the BaseFragment because there is no one. I always get an IllegalArgumentException if I want to navigate to a specific screen (e.g. ProfileFragment) by clicking on an element of the OptionsMenu. Here is the exception:
java.lang.IllegalArgumentException: navigation destination com.test.scanner.debug:id/action_base_to_profile is unknown to this NavController
How we can use the Navigation Component inside a BaseFragment. Is it possible at all or is there another solution for this case?
from Using Navigation Component inside BaseFragment
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