IllegalArgumentException: navigation destination xxx is unknown to this NavController

Question

I am having issue with the new Android Navigation Architecture component when I try to navigate from one Fragment to another, I get this weird error:

Answer 1

I got this same error because I used a Navigation Drawer and getSupportFragmentManager().beginTransaction().replace( ) at the same time somewhere in my code .

I got rid of the error by using this condition(testing if the destination) :

if (Navigation.findNavController(v).getCurrentDestination().getId() == R.id.your_destination_fragment_id)
Navigation.findNavController(v).navigate(R.id.your_action);

In my case the previous error was triggered when I was clicking on the navigation drawer options. Basically the code above did hide the error , because in my code somewhere I used navigation using getSupportFragmentManager().beginTransaction().replace( ) The condition -

 if (Navigation.findNavController(v).getCurrentDestination().getId() ==
  R.id.your_destination_fragment_id) 

was never reached because (Navigation.findNavController(v).getCurrentDestination().getId() was always poiting to home fragment. You must only use Navigation.findNavController(v).navigate(R.id.your_action) or nav graph controller functions for all your navigation actions.