Android Jetpack navigation - How to pass empty string in navigation arguments?

Question

AnimatedNavHost(navController, startDestination = BottomNavItem.Splash.screen_route){
composable(
            signup + "/{emailFromSignIn}" + "/{passwordFromSignIn}",
            arguments = listOf(
                navArgument("emailFromSignIn"){
                    type = NavType.StringType
            },navArgument("passwordFromSignIn"){
                    type = NavType.StringType
            }
}

navController.navigate(signup + "/$textEmail" + "/$textPassword")

How can I pass an empty string?

Error:

Navigation destination that matches request NavDeepLinkRequest{ uri=android-app://androidx.navigation/signup// } cannot be found in the navigation graph NavGraph(0x0) startDestination={Destination(0xb6b16c34) route=splash}

Don't forget to test your navigation argument passing for the character $ and / — EpicPandaForce
– EpicPandaForce, Commented Mar 1, 2022 at 14:06

Phil Dukhov · Accepted Answer · 2022-02-28 12:49:16Z

7

You can use an optional parameter with default empty string value:

composable:

composable(
    route = "$signup?emailFromSignIn={emailFromSignIn}&passwordFromSignIn={passwordFromSignIn}",
    arguments = listOf(
        navArgument("emailFromSignIn"){
            type = NavType.StringType
            defaultValue = ""
        },navArgument("passwordFromSignIn"){
            type = NavType.StringType
            defaultValue = ""
        }
    )
) {

navigate:

navController.navigate("$signup?emailFromSignIn=$textEmail&passwordFromSignIn=$textPassword")

answered Feb 28, 2022 at 12:49

Phil Dukhov

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5 Comments

AlexS Over a year ago

How to build this route before navigate without hardcode?

Phil Dukhov Over a year ago

@AlexS Compose Navigation operates with strings only, you have to build your own system around it to make it less hardcoded. something like this

AlexS Over a year ago

Thank you. I was looking for information on kotlin dsl navigation, the syntax is too similar.

Chuka_FC Over a year ago

Optional parameters only work when your url uses format "?arg1=$value1&arg2=$value2" not this format "/arg1=$value1/arg2=$value2"

Dilanka Laksiri Over a year ago

@AlexS Are you looking this kind of solution? stackoverflow.com/a/77739793/3722222

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