Navigation Architecture Component- Passing argument data to the startDestination

Question

I have an activity A that start activity B passing to it some intent data. Activity B host a navigation graph from the new Navigation Architecture Component.I want to pass t

Answer 1

I think this has changed again with the 1.0.0 release. And Google has hidden this information very well in the official documentation. Or at least I struggled to find it, but stumbled upon it in the Migrate to the Navigation component guide. How to pass arguments to the start destination is mentioned here:

https://developer.android.com/guide/navigation/navigation-migrate#pass_activity_destination_args_to_a_start_destination_fragment

In short

1. You have to set the navigation graph programatically:

findNavController(R.id.main_content)
                .setGraph(R.navigation.product_detail_graph, intent.extras)

2. Don't set the graph in the NavHostFragment XML declaration.
3. Read the extras from the receiver side:

val args by navArgs()  
val productId = args.productId

Update: Google has said that the official documentation for passing arguments to the initial navigation target is indeed missing. Hopefully this is added soon as part of the Navigation component documentation.