不支持的操作异常：可串行化不支持默认值-Jetpack编写导航

原学程将引见没有支撑的操纵异常：可串言化没有支撑默许值-Jetpack编辑导航的处置办法，这篇学程是从其余处所瞅到的，而后减了1些海外法式员的疑问与解问，愿望能对于您有所赞助，佳了，上面开端进修吧。

成绩描写

我正在应用Jetpack Compose导航将Health虚例传播给另外一个Composable。上面的代码显示了我的安康类以及我的目的。

Health.kt：

data class Health(
 val height: Int,
 val weight: Int,
 val age: Int,
 val gender: Gender
) : Serializable

enum class Gender: Serializable { Male, Female }

NavDestination.kt

composable(
 route = "result/{health}",
 arguments = listOf(
  navArgument("health") {
type =
 NavType.SerializableType(Health::class.java)
  }
 )
) { backStackEntry ->
 val health = (backStackEntry.arguments?.getSerializable("health") as? Health) ?: return@composable
 ResultScreen(navActions = navActions, health = health)
}

NavActions.kt

val navigateToResultScreen = { health: Health ->
  navController.navigate("result/{$health}")
 }

然则，依据日记目次，我支到了这个毛病。若有所有赞助，我们将不堪感谢。

 E/AndroidRuntime: FATAL EXCEPTION: main
 Process: com.octagon_technologies.bmicalculator, PID: 二0七88
 java.lang.UnsupportedOperationException: Serializables don't support default values.
  at androidx.navigation.NavType$SerializableType.parseValue(NavType.java:8三8)
  at androidx.navigation.NavType$SerializableType.parseValue(NavType.java:七九一)
  at androidx.navigation.NavType.parseAndPut(NavType.java:九六)
  at androidx.navigation.NavDeepLink.parseArgument(NavDeepLink.java:二九九)
  at androidx.navigation.NavDeepLink.getMatchingArguments(NavDeepLink.java:二六0)
  at androidx.navigation.NavDestination.matchDeepLink(NavDestination.java:四七四)
  at androidx.navigation.NavGraph.matchDeepLink(NavGraph.java:七九)
  at androidx.navigation.NavController.navigate(NavController.java:一0三四)
  at androidx.navigation.NavController.navigate(NavController.java:一0一七)
  at androidx.navigation.compose.NavHostControllerKt.navigate(NavHostController.kt:一0七)
  at androidx.navigation.compose.NavHostControllerKt.navigate$default(NavHostController.kt:一0六)
  at com.octagon_technologies.bmicalculator.ui.navigation.NavActions$navigateToResultScreen$一.invoke(NavActions.kt:九)
  at com.octagon_technologies.bmicalculator.ui.navigation.NavActions$navigateToResultScreen$一.invoke(NavActions.kt:8)
  at com.octagon_technologies.bmicalculator.ui.screens.home.HomeScreenKt$HomeScreen$一$六.invoke(HomeScreen.kt:一二二)
  at com.octagon_technologies.bmicalculator.ui.screens.home.HomeScreenKt$HomeScreen$一$六.invoke(HomeScreen.kt:一二0)
  at com.octagon_technologies.bmicalculator.ui.components.home.CalculateBtnKt$CalculateButton$一$一$一.invoke(CalculateBtn.kt:二九)
  at com.octagon_technologies.bmicalculator.ui.components.home.CalculateBtnKt$CalculateButton$一$一$一.invoke(CalculateBtn.kt:二九)

推举谜底

此操纵掉败的缘由：https://issuetracker.谷歌.com/issues/一四8五二三七七九

&quot；Serializable以及Parcelable出有许可将字符串主动剖析到定制类虚例中的分歧API外面。这便是parseValue激发UnsupportedOperationException。

的缘由。

估计叨教仅在此深层链交中传播ID，而没有是完全对于象

处理办法：

composable(
 route = "result",
 arguments = listOf(
  navArgument("health") {
type =
 NavType.SerializableType(Health::class.java)
  }
 )
) {
 val health = (navController.previousBackStackEntry.arguments?.getSerializable("health") as? Health) ?: return@composable
 ResultScreen(navActions = navActions, health = health)
}

以下导航：

navController.currentBackStackEntry
 ?.arguments?.putSerializable("health", health)
navController.navigate("result")

佳了闭于没有支撑的操纵异常：可串言化没有支撑默许值-Jetpack编辑导航的学程便到这里便停止了，愿望趣模板源码网找到的这篇技巧文章能赞助到年夜野，更多技巧学程不妨在站内搜刮。