How to pass argument in Android Navigation using Kotlin DSL

Question

I have created my NavGraph using the Kotlin DSL and everything is fine. But I'm struggling to pass a simple argument between destinations.

I'm folowing this Android Docs without success: https://developer.android.com/guide/navigation/navigation-kotlin-dsl#constants

Part of graph that adds the argument as the docs says:

            fragment<RestaurantsTabsFragment>(
                "${CampusSelectorDestinations.restaurantsTabsFragment}/" +
                        CampusSelectorArguments.campusId
            ) {
                argument(CampusSelectorArguments.campusId) {
                    type = NavType.StringType
                    defaultValue = "test"
                }
            }

Code with the navigation action trying to pass a argument:

        campusesAdapter.onCampusClick = { campusId ->
                 findNavController().navigate("${CampusSelectorDestinations.restaurantsTabsFragment}/" + campusId
        }

Error I get:

IllegalArgumentException: Navigation destination that matches request NavDeepLinkRequest{ uri=android-app://androidx.navigation/restaurantsTabsFragment/jCkuLbzRHtW0CUzDFWYw } cannot be found in the navigation graph NavGraph

Can anyone help me? I can provide more information if needed

Felipe Santiago · Accepted Answer · 2022-02-01 20:06:31Z

2

The pattern to pass the argumet route is wrong at the docs:

For luck, I've found this explanation inside a Navigation Lib class and that solved my problem (after 2 days struggling):

... In addition to a direct Uri match, the following features are supported: Uris without a scheme are assumed as http and https. For example, www.example.com will match http://www.example.com and https://www.example.com. Placeholders in the form of {placeholder_name} matches 1 or more characters. The String value of the placeholder will be available in the arguments Bundle with a key of the same name. For example, http://www.example.com/users/{id} will match http://www.example.com/users/4. The .* wildcard can be used to match 0 or more characters. These Uris can be declared in your navigation XML files by adding one or more elements as a child to your destination. ...

Hope someone from Google see this and fixes the docs. (or explain if I'm wrong)

edited Feb 1, 2022 at 20:06

answered Feb 1, 2022 at 19:44

Felipe Santiago

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3 Comments

ianhanniballake Over a year ago

You should file an issue to correct the documentation.

Felipe Santiago Over a year ago

done Ian, thank you

Artenes Nogueira Over a year ago

For required args you do path/{name-of-argument}, for optional you do path?name={name-of-argument}. In the second case the "name" query paramenter can be anything, you just have to match it when navigating to this route. There is no option to have a route such as "user/{id}" and have the "id" being optional so it can match with both "/user" and "/suer/435". developer.android.com/jetpack/compose/navigation

Maxim Hnatiuk · Accepted Answer · 2022-03-02 13:26:25Z

1

Just put your arguments into curved breaks and separate them by slash as it shown in the example below.

Define your destination with all required argument:

fragment<TransactionFragment>("${MainNavRoute.transaction}/{arg1}/{arg2}") {
   argument("arg1") {
       type = NavType.StringType
   }
   argument("arg2") {
       type = NavType.LongType
   }

Navigation to the destination:

findNavController().navigate("${MainNavRoute.transaction}/string_value/2")

Also, I have reported an issue to the tracker too. https://issuetracker.google.com/issues/221895357

edited Mar 2, 2022 at 13:26

answered Mar 2, 2022 at 13:10

Maxim Hnatiuk

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