Navigation Architecture Component- Passing argument data to the startDestination

TLDR: You have to manually inflate the graph, add the keys/values to the defaultArgs, and set the graph on the navController.

Step 1

The documentation tells you to set the graph in the <fragment> tag in your Activity's layout. Something like:

<fragment    android:id="@+id/navFragment"    android:name="androidx.navigation.fragment.NavHostFragment"    app:graph="@navigation/nav_whatever"    app:defaultNavHost="true"    />

REMOVE the line setting the graph=.

Step 2

In the Activity that will be displaying your NavHostFragment, inflate the graph like so:

val navHostFragment = navFragment as NavHostFragmentval inflater = navHostFragment.navController.navInflaterval graph = inflater.inflate(R.navigation.nav_whatever)

Where navFragment is the id you gave your fragment in XML, as above.

Step 3 [Crucial!]

Create a bundle to hold the arguments you want to pass to your startDestination fragment and add it to the graph's default arguments:

val bundle = Bundle()// ...add keys and valuesgraph.addDefaultArguments(bundle)

Step 4

Set the graph on the host's navController:

navHostFragment.navController.graph = graph

OK, I found a solution to that problem thanks to Ian Lake from the Google team.Let say you have an activity A that will start activity B with some intent data and you want to get that data in the startDestination you have two options here if you using safe args which is my case you could do

StartFragmentArgs.fromBundle(requireActivity().intent?.extras)

to read the args from the Intent. If you don't use safe args you can extract the data from the bundle your self-using requireActivity().intent?.extras which will return a Bundle you can use instead of the fragment getArguments() method. That's it I try it and everything works fine.

It had been fixed in 1.0.0-alpha07. See detail.

The solution is similar to Elliot Schrock's answer, but wrapping by official API.

We have to manually inflate NavHostFragment or graph

Use

NavHostFragment.create(R.navigation.graph, args)

Or

navController.setGraph(R.navigation.graph, args)

The args are the data we want to pass to start destination.