IssueTracker

Support for nullable Enum is also added in https://android-review.googlesource.com/c/platform/frameworks/support/+/3195076/2

Will be available in the release on August 7th.

This still seems to be broken with 2.8.0-beta07

Here is the simple setup

package org.jdc.template.ux.test

enum class TestEnum {
    ONE,
    TWO
}

@Serializable
data class TestRoute(
    val testEnum: TestEnum
)

package org.jdc.template.ux

@Composable
fun NavGraph(
    navController: NavHostController,
) {
    NavHost(navController = navController, startDestination = StartRoute) {
        composable<TestRoute> { } // CRASH happens HERE
    }
}

The exception I'm seeing is:

                 java.lang.IllegalArgumentException: Cannot find class with name "org.jdc.template.ux.test.TestEnum". Ensure that the serialName for this argument is the default fully qualified name
                 	at androidx.navigation.serialization.NavTypeConverterKt.getClass(NavTypeConverter.kt:146)
                 	at androidx.navigation.serialization.NavTypeConverterKt.getNavType(NavTypeConverter.kt:92)
                 	at androidx.navigation.serialization.RouteSerializerKt.computeNavType(RouteSerializer.kt:159)
                 	at androidx.navigation.serialization.RouteSerializerKt.forEachIndexedKType(RouteSerializer.kt:185)
                 	at androidx.navigation.serialization.RouteSerializerKt.generateRoutePattern(RouteSerializer.kt:62)
                 	at androidx.navigation.serialization.RouteSerializerKt.generateRoutePattern$default(RouteSerializer.kt:45)
                 	at androidx.navigation.NavDestinationBuilder.<init>(NavDestinationBuilder.kt:92)
                 	at androidx.navigation.compose.ComposeNavigatorDestinationBuilder.<init>(ComposeNavigatorDestinationBuilder.kt:95)
                 	at org.jdc.template.ux.NavGraphKt.NavGraph$lambda$2(NavGraph.kt:246)

Debugging at where it is crashing, I'm seeing that className IS equal to "org.jdc.template.ux.test.TestEnum" in SerialDescriptor.getClass().... but failing to find the class (it is always throwing ClassNotFoundException)

To double-check things (test if I also get a ClassNotFoundException), I put the following code in above the NavHost:

Class.forName("org.jdc.template.ux.test.TestEnum")

I get NO exception in my code (I don't know why SerialDescriptor.getClass() cannot find the class)

Re comment#4 - please file a new bug with a sample project that reproduces your issue and we can take a look!

I got the same issue as #4, and it's still here in 2.8.0-beta07.

Even if regular enums are implicitly Serializable, you still need to add it or the issue Ensure that the serialName for this argument is the default fully qualified name will appear.

package org.jdc.template.ux.test

@Serializable
enum class TestEnum {
    ONE,
    TWO
}

@Serializable
data class TestRoute(
    val testEnum: TestEnum
)

You will also need to specified type in the declaration of your route:

composable<Route.TestRoute>(
    typeMap = mapOf(
        typeOf<TestEnum>() to NavType.EnumType(TestEnum::class.java)
    ),
) {
    ...
}

During my investigations, I've found that if you declare it like this:

package org.jdc.template.ux.test

@Serializable
data class TestRoute(
    val testEnum: TestEnum
) {
    enum class TestEnum {
        ONE,
        TWO
    }
}

It will work on non-minified code, but it won't after minifying and you will get same error as before.

There is a known issue reported in this bug with top-level Enums. Bug has been fixed and will be available in the release on Aug 21st.

The following release(s) address this bug.It is possible this bug has only been partially addressed:

• androidx.navigation:navigation-common:2.8.0-beta07
• androidx.navigation:navigation-runtime:2.8.0-beta07