How to navigate from nested Fragment to parent fragment using Jetpack Navigation?

In your code, you can pass the resource ID of the global action to the navigate() method for each UI element.

your_button.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View view) {
       Navigation.findNavController(view).navigate(R.id.main_fragment);
   }
});

When you have nested NavControllers, findNavController() return only last. To get previous navControllers, you can traverse up using parentFragment property.

Extensions with this approach:

// find all nav controllers from closest to farest
fun Fragment.findAllNavControllers(): List<NavController> {
    val navControllers = mutableListOf<NavController>()
    var parent = parentFragment
    while (parent != null) {
        if (parent is NavHostFragment) {
            navControllers.add(parent.navController)
        }
        parent = parent.parentFragment
    }
    return navControllers
}

// find one nav controller by fragment id
fun Fragment.findNavControllerById(@IdRes id: Int): NavController {
    var parent = parentFragment
    while (parent != null) {
        if (parent is NavHostFragment && parent.id == id) {
            return parent.navController
        }
        parent = parent.parentFragment
    }
    throw RuntimeException("NavController with specified id not found")
}

And usage:

findAllNavControllers()[2]
findNavControllerById(R.id.navHostFragment)

If you have more than one navigation graph, please make sure you're using the right navigation controller. Using Navigation.findNavController(view) in some cases you might need to get your root view to get the root's navigation. Hope, this'll help.