Add Nav3 dependencies, :core:navigation and NavDisplay

app/build.gradle.kts

@@ -78,6 +78,7 @@ dependencies {
     implementation(projects.feature.settings)
 
     implementation(projects.core.common)
+    implementation(projects.core.navigation)
     implementation(projects.core.ui)
     implementation(projects.core.designsystem)
     implementation(projects.core.data)

app/src/main/kotlin/com/google/samples/apps/nowinandroid/navigation/NiaNavHost.kt

@@ -19,6 +19,11 @@ package com.google.samples.apps.nowinandroid.navigation
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
 import androidx.navigation.compose.NavHost
+import androidx.navigation3.runtime.NavKey
+import androidx.navigation3.runtime.entry
+import androidx.navigation3.runtime.entryProvider
+import androidx.navigation3.runtime.rememberNavBackStack
+import androidx.navigation3.ui.NavDisplay
 import com.google.samples.apps.nowinandroid.feature.bookmarks.impl.navigation.bookmarksScreen
 import com.google.samples.apps.nowinandroid.feature.foryou.navigation.ForYouBaseRoute
 import com.google.samples.apps.nowinandroid.feature.foryou.navigation.forYouSection
@@ -29,6 +34,7 @@ import com.google.samples.apps.nowinandroid.feature.topic.navigation.topicScreen
 import com.google.samples.apps.nowinandroid.navigation.TopLevelDestination.INTERESTS
 import com.google.samples.apps.nowinandroid.ui.NiaAppState
 import com.google.samples.apps.nowinandroid.ui.interests2pane.interestsListDetailScreen
+import kotlinx.serialization.Serializable
 
 /**
  * Top-level navigation graph. Navigation is organized as explained at
@@ -44,29 +50,38 @@ fun NiaNavHost(
     modifier: Modifier = Modifier,
 ) {
     val navController = appState.navController
-    NavHost(
+    val backStack = rememberNavBackStack(LegacyRoute)
-        navController = navController,
+
-        startDestination = ForYouBaseRoute,
+    NavDisplay(backStack = backStack, entryProvider = entryProvider {
-        modifier = modifier,
+        entry<LegacyRoute> {
-    ) {
+            NavHost(
-        forYouSection(
+                navController = navController,
-            onTopicClick = navController::navigateToTopic,
+                startDestination = ForYouBaseRoute,
-        ) {
+                modifier = modifier,
-            topicScreen(
+            ) {
-                showBackButton = true,
+                forYouSection(
-                onBackClick = navController::popBackStack,
+                    onTopicClick = navController::navigateToTopic,
-                onTopicClick = navController::navigateToTopic,
+                ) {
-            )
+                    topicScreen(
+                        showBackButton = true,
+                        onBackClick = navController::popBackStack,
+                        onTopicClick = navController::navigateToTopic,
+                    )
+                }
+                bookmarksScreen(
+                    onTopicClick = navController::navigateToInterests,
+                    onShowSnackbar = onShowSnackbar,
+                )
+                searchScreen(
+                    onBackClick = navController::popBackStack,
+                    onInterestsClick = { appState.navigateToTopLevelDestination(INTERESTS) },
+                    onTopicClick = navController::navigateToInterests,
+                )
+                interestsListDetailScreen()
+            }
         }
-        bookmarksScreen(
+    })
-            onTopicClick = navController::navigateToInterests,
-            onShowSnackbar = onShowSnackbar,
-        )
-        searchScreen(
-            onBackClick = navController::popBackStack,
-            onInterestsClick = { appState.navigateToTopLevelDestination(INTERESTS) },
-            onTopicClick = navController::navigateToInterests,
-        )
-        interestsListDetailScreen()
-    }
 }
+
+@Serializable
+data object LegacyRoute : NavKey

build-logic/convention/src/main/kotlin/com/google/samples/apps/nowinandroid/KotlinAndroid.kt

@@ -35,7 +35,7 @@ internal fun Project.configureKotlinAndroid(
     commonExtension: CommonExtension<*, *, *, *, *, *>,
 ) {
     commonExtension.apply {
-        compileSdk = 35
+        compileSdk = 36
 
         defaultConfig {
             minSdk = 21

core/navigation/.gitignore

@@ -0,0 +1 @@
+/build

core/navigation/build.gradle.kts

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2025 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+plugins {
+    alias(libs.plugins.nowinandroid.android.library)
+}
+
+android {
+    namespace = "com.google.samples.apps.nowinandroid.core.navigation"
+}
+
+dependencies {
+    api(libs.androidx.navigation3.ui)
+    api(libs.androidx.navigation3.runtime)
+}

gradle/libs.versions.toml

@@ -2,7 +2,7 @@
 accompanist = "0.37.0"
 androidDesugarJdkLibs = "2.1.4"
 # AGP and tools should be updated together
-androidGradlePlugin = "8.9.0"
+androidGradlePlugin = "8.9.3"
 androidTools = "31.9.0"
 androidxActivity = "1.9.3"
 androidxAppCompat = "1.7.0"
@@ -21,6 +21,7 @@ androidxLintGradle = "1.0.0-alpha03"
 androidxMacroBenchmark = "1.3.4"
 androidxMetrics = "1.0.0-beta01"
 androidxNavigation = "2.8.5"
+androidxNavigation3 = "1.0.0-alpha04"
 androidxProfileinstaller = "1.4.1"
 androidxTestCore = "1.6.1"
 androidxTestExt = "1.2.1"
@@ -59,6 +60,9 @@ room = "2.6.1"
 secrets = "2.0.1"
 truth = "1.4.4"
 turbine = "1.2.0"
+junit = "4.13.2"
+junitVersion = "1.2.1"
+material = "1.12.0"
 
 [bundles]
 androidx-compose-ui-test = ["androidx-compose-ui-test", "androidx-compose-ui-testManifest"]
@@ -99,6 +103,8 @@ androidx-lint-gradle = { group = "androidx.lint", name = "lint-gradle", version.
 androidx-metrics = { group = "androidx.metrics", name = "metrics-performance", version.ref = "androidxMetrics" }
 androidx-navigation-compose = { group = "androidx.navigation", name = "navigation-compose", version.ref = "androidxNavigation" }
 androidx-navigation-testing = { group = "androidx.navigation", name = "navigation-testing", version.ref = "androidxNavigation" }
+androidx-navigation3-runtime = { module = "androidx.navigation3:navigation3-runtime", version.ref = "androidxNavigation3" }
+androidx-navigation3-ui = { module = "androidx.navigation3:navigation3-ui", version.ref = "androidxNavigation3" }
 androidx-profileinstaller = { group = "androidx.profileinstaller", name = "profileinstaller", version.ref = "androidxProfileinstaller" }
 androidx-test-core = { group = "androidx.test", name = "core", version.ref = "androidxTestCore" }
 androidx-test-espresso-core = { group = "androidx.test.espresso", name = "espresso-core", version.ref = "androidxEspresso" }
@@ -161,6 +167,9 @@ firebase-performance-gradlePlugin = { group = "com.google.firebase", name = "per
 kotlin-gradlePlugin = { group = "org.jetbrains.kotlin", name = "kotlin-gradle-plugin", version.ref = "kotlin" }
 ksp-gradlePlugin = { group = "com.google.devtools.ksp", name = "com.google.devtools.ksp.gradle.plugin", version.ref = "ksp" }
 room-gradlePlugin = { group = "androidx.room", name = "room-gradle-plugin", version.ref = "room" }
+junit = { group = "junit", name = "junit", version.ref = "junit" }
+androidx-junit = { group = "androidx.test.ext", name = "junit", version.ref = "junitVersion" }
+material = { group = "com.google.android.material", name = "material", version.ref = "material" }
 
 [plugins]
 android-application = { id = "com.android.application", version.ref = "androidGradlePlugin" }
@@ -198,3 +207,4 @@ nowinandroid-android-room = { id = "nowinandroid.android.room" }
 nowinandroid-android-test = { id = "nowinandroid.android.test" }
 nowinandroid-hilt = { id = "nowinandroid.hilt" }
 nowinandroid-jvm-library = { id = "nowinandroid.jvm.library" }
+kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }

settings.gradle.kts

@@ -84,3 +84,4 @@ check(JavaVersion.current().isCompatibleWith(JavaVersion.VERSION_17)) {
     https://developer.android.com/build/jdks#jdk-config-in-studio
     """.trimIndent()
 }
+include(":core:navigation")