Copy Navigation3 1.1.0-alpha01 (#2622)

| GroupId | ReleaseVersion | ReleaseSHA | ReleaseBuildId | ReleaseDate |
| --- | --- | --- | --- | --- |
| androidx.navigation3 | 1.1.0-alpha01 |
deb9649 | 14504571 | 12/3/2025 |


Fixes [CMP-9378](https://youtrack.jetbrains.com/issue/CMP-9378)

## Testing
N/A

## Release Notes
N/A

Author: eymar

gradle.properties

@@ -115,7 +115,7 @@ artifactRedirection.version.androidx.annotation=1.9.1
 artifactRedirection.version.androidx.graphics=1.1.0-alpha01
 artifactRedirection.version.androidx.lifecycle=2.10.0
 artifactRedirection.version.androidx.navigation=2.9.1
-artifactRedirection.version.androidx.navigation3=1.0.0-rc01
+artifactRedirection.version.androidx.navigation3=1.1.0-alpha01
 artifactRedirection.version.androidx.navigationevent=1.0.0-rc01
 artifactRedirection.version.androidx.performance=1.0.0-alpha01
 artifactRedirection.version.androidx.savedstate=1.4.0

libraryversions.toml

@@ -96,7 +96,7 @@ MEDIA = "1.7.0-rc01"
 MEDIAROUTER = "1.8.0-alpha01"
 METRICS = "1.0.0-beta02"
 NAVIGATION = "2.9.1"
-NAVIGATION3 = "1.0.0-rc01"
+NAVIGATION3 = "1.1.0-alpha01"
 NAVIGATIONEVENT = "1.0.0-rc01"
 PAGING = "3.4.0-alpha01"
 PALETTE = "1.1.0-alpha01"

navigation3/navigation3-runtime/samples/src/main/kotlin/androidx/navigation3/runtime/samples/NavBackStackSamples.kt

@@ -21,35 +21,60 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.saveable.rememberSerializable
 import androidx.navigation3.runtime.NavBackStack
 import androidx.navigation3.runtime.NavKey
-import androidx.navigation3.runtime.samples.NavBackStackSamples.MultiBackStack
+import androidx.navigation3.runtime.samples.NavBackStackSamples.Chat
+import androidx.navigation3.runtime.samples.NavBackStackSamples.Home
+import androidx.navigation3.runtime.samples.NavBackStackSamples.SealedKey
+import androidx.navigation3.runtime.samples.NavBackStackSamples.Spaces
+import androidx.savedstate.serialization.SavedStateConfiguration
 import kotlinx.serialization.Serializable
+import kotlinx.serialization.modules.SerializersModule
+import kotlinx.serialization.modules.polymorphic
+import kotlinx.serialization.modules.subclass
 import kotlinx.serialization.serializer
 
 object NavBackStackSamples {
 
+    // --- Open Polymorphism ---
     @Serializable open class Home : NavKey
 
     @Serializable open class Chat : NavKey
 
     @Serializable open class Spaces : NavKey
 
+    // --- Closed Polymorphism ---
     @Serializable
-    class MultiBackStack(
-        val homeTabStack: NavBackStack<Home>,
-        val chatTabStack: NavBackStack<Chat>,
-        val spacesTabStack: NavBackStack<Spaces>,
-    )
+    sealed class SealedKey : NavKey {
+
+        @Serializable class Inbox : SealedKey()
+
+        @Serializable class Settings : SealedKey()
+    }
+}
+
+@Composable
+@Sampled
+fun NavBackStack_OpenPolymorphism() {
+    // https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/polymorphism.md#open-polymorphism
+    rememberSerializable(
+        serializer = serializer(),
+        configuration =
+            SavedStateConfiguration {
+                serializersModule = SerializersModule {
+                    polymorphic(baseClass = NavKey::class) {
+                        subclass(clazz = Home::class)
+                        subclass(clazz = Chat::class)
+                        subclass(clazz = Spaces::class)
+                    }
+                }
+            },
+    ) {
+        NavBackStack<NavKey>()
+    }
 }
 
 @Composable
 @Sampled
-fun NavBackStack_Serializer() {
-    val multiBackStack =
-        rememberSerializable(serializer = serializer()) {
-            MultiBackStack(
-                homeTabStack = NavBackStack(),
-                chatTabStack = NavBackStack(),
-                spacesTabStack = NavBackStack(),
-            )
-        }
+fun NavBackStack_ClosedPolymorphism() {
+    // https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/polymorphism.md#closed-polymorphism
+    rememberSerializable(serializer = serializer()) { NavBackStack<SealedKey>() }
 }

navigation3/navigation3-runtime/samples/src/main/kotlin/androidx/navigation3/runtime/samples/NavBackStackSerializerSamples.kt

@@ -20,9 +20,8 @@ import androidx.annotation.Sampled
 import androidx.compose.runtime.Composable
 import androidx.navigation3.runtime.NavBackStack
 import androidx.navigation3.runtime.NavKey
-import androidx.navigation3.runtime.samples.RememberNavBackStackSamples.Details
-import androidx.navigation3.runtime.samples.RememberNavBackStackSamples.Home
-import androidx.navigation3.runtime.samples.RememberNavBackStackSamples.Screen
+import androidx.navigation3.runtime.samples.NavBackStackSerializerSamples.Details
+import androidx.navigation3.runtime.samples.NavBackStackSerializerSamples.Home
 import androidx.navigation3.runtime.serialization.NavBackStackSerializer
 import androidx.savedstate.serialization.SavedStateConfiguration
 import androidx.savedstate.serialization.decodeFromSavedState
@@ -32,21 +31,19 @@ import kotlinx.serialization.modules.SerializersModule
 import kotlinx.serialization.modules.polymorphic
 import kotlinx.serialization.modules.subclass
 
-object NavBackStackSerializerSamples {
+private object NavBackStackSerializerSamples {
 
-    @Serializable open class Screen : NavKey
+    @Serializable open class Home(val id: String) : NavKey
 
-    @Serializable open class Home(val id: String) : Screen()
-
-    @Serializable open class Details(val itemId: Long) : Screen()
+    @Serializable open class Details(val itemId: Long) : NavKey
 }
 
 @Composable
 @Sampled
 fun NavBackStackSerializer_withReflection() {
     // On Android, the no-argument overload uses reflection and requires no configuration.
     // This will throw a runtime exception on non-Android platforms during serialization.
-    val serializer = NavBackStackSerializer<Screen>()
+    val serializer = NavBackStackSerializer<NavKey>()
 
     val backStack = NavBackStack(Home("abc"), Details(42))
     val encoded = encodeToSavedState(serializer, backStack)
@@ -57,14 +54,14 @@ fun NavBackStackSerializer_withReflection() {
 @Sampled
 fun NavBackStackSerializer_withSerializersModule() {
     val module = SerializersModule {
-        polymorphic(Screen::class) {
+        polymorphic(NavKey::class) {
             subclass(Home.serializer())
             subclass(Details.serializer())
         }
     }
     val configuration = SavedStateConfiguration { serializersModule = module }
 
-    val serializer = NavBackStackSerializer<Screen>()
+    val serializer = NavBackStackSerializer<NavKey>()
 
     // Pass the same configuration (or at least its serializersModule) to encode/decode:
     val backStack = NavBackStack(Home("abc"), Details(42))

navigation3/navigation3-runtime/samples/src/main/kotlin/androidx/navigation3/runtime/samples/RememberNavBackStackSamples.kt

@@ -22,20 +22,17 @@ import androidx.navigation3.runtime.NavKey
 import androidx.navigation3.runtime.rememberNavBackStack
 import androidx.navigation3.runtime.samples.RememberNavBackStackSamples.Details
 import androidx.navigation3.runtime.samples.RememberNavBackStackSamples.Home
-import androidx.navigation3.runtime.samples.RememberNavBackStackSamples.Screen
 import androidx.savedstate.serialization.SavedStateConfiguration
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.modules.SerializersModule
 import kotlinx.serialization.modules.polymorphic
 import kotlinx.serialization.modules.subclass
 
-object RememberNavBackStackSamples {
+private object RememberNavBackStackSamples {
 
-    @Serializable open class Screen : NavKey
+    @Serializable open class Home(val id: String) : NavKey
 
-    @Serializable open class Home(val id: String) : Screen()
-
-    @Serializable open class Details(val itemId: Long) : Screen()
+    @Serializable open class Details(val itemId: Long) : NavKey
 }
 
 @Composable
@@ -51,7 +48,7 @@ fun rememberNavBackStack_withSerializersModule() {
     val config = SavedStateConfiguration {
         // Register subtypes for open polymorphism or multiplatform use.
         serializersModule = SerializersModule {
-            polymorphic(baseClass = Screen::class) {
+            polymorphic(baseClass = NavKey::class) {
                 subclass(serializer = Home.serializer())
                 subclass(serializer = Details.serializer())
             }

navigation3/navigation3-runtime/src/commonMain/kotlin/androidx/navigation3/runtime/NavBackStack.kt

@@ -41,7 +41,8 @@ import kotlinx.serialization.Serializable
  * backStack.removeLast()         // pops stack
  * ```
  *
- * @sample androidx.navigation3.runtime.samples.NavBackStack_Serializer
+ * @sample androidx.navigation3.runtime.samples.NavBackStack_OpenPolymorphism
+ * @sample androidx.navigation3.runtime.samples.NavBackStack_ClosedPolymorphism
  * @constructor Creates a new back stack backed by the provided [SnapshotStateList].
  * @see rememberNavBackStack for lifecycle-aware persistence.
  */