I've upgraded to recently released navigation component alpha05 and this error popped up:

Unresolved reference. None of the following candidates is applicable because of receiver type mismatch:
public fun `Activity;`.findNavController(viewId: Int): `NavController;` defined in androidx.navigation
public fun `View;`.findNavController(): `NavController;` defined in androidx.navigation

This means my previously working code doesn't compile anymore on this stuff:

view.setOnClickListener {
    it.findNavController().navigate(somewhere)
}

cause it cant resolve

findNavController()

extension function. I think it's a collision? Checked the source code

package androidx.navigation

import android.view.View
/**
 * Find a [NavController] associated with a [View].
 *
 * Calling this on a View not within a [NavHost] will result in an
 * [IllegalStateException]
 */
fun View.findNavController(): NavController =
        Navigation.findNavController(this)

and

package androidx.navigation
import android.app.Activity
import android.support.annotation.IdRes
/**
 * Find a [NavController] given the id of a View and its containing
 * [Activity].
 *
 * Calling this on a View that is not a [NavHost] or within a [NavHost]
 * will result in an [IllegalStateException]
 */
fun Activity.findNavController(@IdRes viewId: Int): NavController =
        Navigation.findNavController(this, viewId)

these two collide I think and when you

import androidx.navigation.findNavController

it doesn't know which one to import?

Isn't

it

in

setOnClickListener { ... }

nullable? Try with safe call (

it?.findNavController()

)

Same thing happens, it is of type

View!

anyway, so yeah, can be Nullable but basically never is. And if i use

it!!

or

it?

nothing change