IllegalStateException: Link does not have a NavController set

Question

I\'m using Android Navigation Component for Navigation. I have a LoginFragment which has a button to transition to SignUpFragment. On clicking the button I\'m getting this e

Answer 1

UPDATED SOLUTION

Actually, Navigation can't find NavController in FrameLayout. So replacing <FrameLayout> with <fragment> will make it work

Add the following inside the <fragment> tag -

android:name="androidx.navigation.fragment.NavHostFragment"

After doing the changes, the code will look similar to this -

 <fragment
       android:id="@+id/fragment_container"
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       app:layout_behavior="@string/appbar_scrolling_view_behavior"
       android:name="androidx.navigation.fragment.NavHostFragment"
       app:navGraph="@navigation/main_navigation"
       app:defaultNavHost="true"/>

Answer 2

In Java try this below line:

Navigation.findNavController(findViewById(R.id.nav_host_fragment)).navigate(R.id.first_fragment);

Answer 3

Use the view of fragment such as onViewCreated

 override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)

    val navController = Navigation.findNavController(view)

    binding.signUpLink.setOnClickListener {
            navController.navigate(R.id.action_loginFragment_to_signUpFragment)
    }