動的機能モジュールのレシピ
このレシピでは、動的機能モジュール(DFM)を Navigation 3 と統合する方法について説明します。このレシピを進めるには、Play 機能配信について理解しておく必要があります。
仕組み
この例では、3 つの異なるモジュールと配信オプションで画面の 3 つのキーを定義します。
Home: メインの:appモジュールの画面。動的機能モジュールから画面に移動するためのボタンが表示されます。InstallTimeModule.Home::dynamicfeature:installtimeモジュールの画面。配信時にインストールされます。たとえば、アプリの初回インストール時に必要となるアセットが豊富なオンボーディング モジュールに使用できます。オンボーディングが完了したら削除できます。OnDemandModule.Home::dynamicfeature:ondemandモジュールの画面。オンデマンドでインストールされます。たとえば、ファイルサイズが大きく、ユーザーベースの小さなサブセットのみが使用すると想定されるモジュールに使用できます。
DynamicModule
DynamicModule は、動的機能モジュールをモデル化するために使用される抽象クラスです。つまり、対応する DynamicModuleEntryBuilder(次のセクションで説明)の moduleName と entryBuilderClassName の両方を保存します。
object ExampleModule : DynamicModule(
entryBuilderClassName = "com.example.module.ExampleEntryBuilder",
moduleName = "example"
) {
@Serializable
data object Screen : AppNavKey
}
DynamicModuleEntryBuilder
各動的機能モジュールには、DynamicModuleEntryBuilder の実装が必要 です。これは、そのモジュールのエントリをメインの :app モジュールの entryProvider に追加するために使用されます。
// Inside :example module
@Suppress("unused")
class ExampleEntryBuilder : DynamicModuleEntryBuilder {
override fun EntryProviderScope<NavKey>.build() {
appEntry<ExampleModule.Screen> {
ExampleScreen()
}
}
}
@Composable
private fun ExampleScreen() {
// ...
}
buildDynamicEntries()
EntryProviderScope の拡張関数。そのモジュールの DynamicModuleEntryBuilder を解決し、その build() 関数を呼び出します。
// Inside :app module
val ALL_DYNAMIC_MODULES_MAP = listOf(
ExampleModule,
// ...
).associateBy { it.moduleName }
NavDisplay(
// ...
entryProvider = entryProvider {
// ...
dynamicFeatureManager.installedModules
.mapNotNull { ALL_DYNAMIC_MODULES_MAP[it] }
.forEach { buildDynamicEntries(it) }
}
)
DynamicFeatureManager
動的機能モジュールのインストールを管理するクラス。
動的機能モジュールに含まれるキーに移動するには、installModule メソッドを使用します。このメソッドは、対応するモジュールがまだインストールされていない場合は自動的にインストールし、モジュールのインストール時にコールバックを実行します。モジュールがすでにインストールされている場合、このコールバックはすぐに呼び出されます。
// Inside :app module
// Initialize the manager
val dynamicFeatureManager = retainDynamicFeatureManager()
// E.g. in a Button's onClick
dynamicFeatureManager.installModule(
moduleName = ExampleModule.moduleName,
onModuleInstalled = {
backStack.add(ExampleModule.Screen)
}
)
インストール状況をモニタリングするには、マネージャーを DynamicFeatureDownloadProgressDialog コンポーザブルにアタッチします。
DynamicFeatureDownloadProgressDialog(dynamicFeatureManager)
Proguard ルール
R8 の縮小化が有効になっているときに entryBuilderClassName で参照されるクラスにアクセスできるようにするには、このルールを proguard-rules.pro に追加します。
-keep class * implements com.example.nav3recipes.dynamicfeature.DynamicModuleEntryBuilder {
public <init>();
}
ローカルでテストする方法
実装が機能しているかどうかをテストするには、アプリを実行して、ターゲット モジュールのエントリに移動します。Android Studio はデフォルトで、実行構成にすべての動的機能モジュールを含めます。
モジュールのダウンロードとインストールをシミュレートするには、bundletool を使用します。
ヒント: Homebrew(
brew install bundletool)を使用してbundletoolをインストールした場合は、下記のコマンドでjava -jar bundletool.jarをbundletoolに置き換えることができます。
-
プロジェクトの AAB をビルドします。
./gradlew :app:bundleDebug -
bundletoolを使用して、ビルドした AAB をローカルテストが有効な APKS に変換します。java -jar bundletool.jar build-apks --local-testing --bundle <project-path>/app/build/outputs/bundle/debug/app-debug.aab --output app-debug.apks --overwrite -
bundletoolを使用して、変換した APKS をインストールします。java -jar bundletool.jar install-apks --apks app-debug.apks -
ランチャー アイコンからアプリを実行します。
オンデマンド モジュール エントリに初めて移動すると、ダウンロード状況のダイアログが表示されます。
実装上の注意
DynamicFeatureManager
- このレシピでは、一度に 1 つのインストール セッションのみがサポートされます。アプリで複数のセッションを同時に使用する必要がある場合は、複数のセッションを同時にトラッキングするようにマネージャーを調整する必要があります。
- このレシピでは、ネットワーク エラーや内部エラーなどの自動再試行は実装されていません。詳細については、リクエスト エラーを処理するをご覧ください。
- アプリが別のモジュールからリソースとアセットにアクセスする場合、このレシピではモジュールのインストール後に
SplitCompatが自動的に再インストールされないことに注意してください。
/* * Copyright 2026 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 * * http://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. */ package com.example.nav3recipes.dynamicfeature import android.os.Bundle import androidx.activity.ComponentActivity import androidx.activity.compose.setContent import androidx.compose.foundation.layout.Column import androidx.compose.foundation.layout.fillMaxSize import androidx.compose.material3.Button import androidx.compose.material3.Text import androidx.compose.runtime.Composable import androidx.compose.ui.Modifier import androidx.lifecycle.compose.dropUnlessResumed import androidx.navigation3.runtime.entryProvider import androidx.navigation3.runtime.rememberNavBackStack import androidx.navigation3.ui.NavDisplay import com.example.nav3recipes.content.ContentGreen import com.example.nav3recipes.ui.setEdgeToEdgeConfig import kotlinx.serialization.Serializable class DynamicFeatureActivity : ComponentActivity() { override fun onCreate(savedInstanceState: Bundle?) { setEdgeToEdgeConfig() super.onCreate(savedInstanceState) setContent { val backStack = rememberNavBackStack(Home) val dynamicFeatureManager = retainDynamicFeatureManager() DynamicFeatureDownloadProgressDialog(dynamicFeatureManager) NavDisplay( backStack = backStack, onBack = { backStack.removeLastOrNull() }, modifier = Modifier.fillMaxSize(), entryProvider = entryProvider { appEntry<Home> { HomeScreen( onNavigateToInstallTime = { dynamicFeatureManager.installModule( moduleName = InstallTimeModule.moduleName, onModuleInstalled = { backStack.add(InstallTimeModule.Home) } ) }, onNavigateToOnDemand = { dynamicFeatureManager.installModule( moduleName = OnDemandModule.moduleName, onModuleInstalled = { backStack.add(OnDemandModule.Home) } ) }, ) } dynamicFeatureManager.installedModules .mapNotNull { ALL_DYNAMIC_MODULES_MAP[it] } .forEach { buildDynamicEntries(it) } } ) } } } @Composable fun HomeScreen( onNavigateToInstallTime: () -> Unit, onNavigateToOnDemand: () -> Unit, modifier: Modifier = Modifier, ) { ContentGreen( title = "Home screen", modifier = modifier, ) { Column { Button(onClick = dropUnlessResumed { onNavigateToInstallTime() }) { Text(text = "Go to Install Time Module Screen") } Button(onClick = dropUnlessResumed { onNavigateToOnDemand() }) { Text(text = "Go to On Demand Module Screen") } } } } @Serializable private data object Home : AppNavKey private val ALL_DYNAMIC_MODULES_MAP = listOf( InstallTimeModule, OnDemandModule ).associateBy { it.moduleName } object InstallTimeModule : DynamicModule( entryBuilderClassName = "com.example.dynamicfeature.installtime.InstallTimeEntryBuilder", moduleName = "installtime", ) { @Serializable data object Home : AppNavKey { override fun toContentKey(): Any { return "InstallTimeHome" } } } object OnDemandModule : DynamicModule( entryBuilderClassName = "com.example.dynamicfeature.ondemand.OnDemandEntryBuilder", moduleName = "ondemand" ) { @Serializable data object Home : AppNavKey { override fun toContentKey(): Any { return "OnDemandHome" } } }
/* * Copyright 2026 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 * * http://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. */ package com.example.nav3recipes.dynamicfeature import android.content.Context import androidx.activity.result.ActivityResultLauncher import androidx.activity.result.IntentSenderRequest import androidx.compose.runtime.Composable import androidx.compose.runtime.DisposableEffect import androidx.compose.runtime.Stable import androidx.compose.runtime.getValue import androidx.compose.runtime.mutableStateOf import androidx.compose.runtime.retain.retain import androidx.compose.runtime.setValue import androidx.compose.ui.platform.LocalContext import com.google.android.play.core.ktx.bytesDownloaded import com.google.android.play.core.ktx.errorCode import com.google.android.play.core.ktx.sessionId import com.google.android.play.core.ktx.status import com.google.android.play.core.ktx.totalBytesToDownload import com.google.android.play.core.splitinstall.SplitInstallManagerFactory import com.google.android.play.core.splitinstall.SplitInstallRequest import com.google.android.play.core.splitinstall.SplitInstallSessionState import com.google.android.play.core.splitinstall.SplitInstallStateUpdatedListener import com.google.android.play.core.splitinstall.model.SplitInstallSessionStatus @Composable fun retainDynamicFeatureManager(): DynamicFeatureManager { val applicationContext = LocalContext.current.applicationContext val manager = retain { DynamicFeatureManager(applicationContext) } DisposableEffect(manager) { onDispose { manager.dispose() } } return manager } sealed interface InstallStatus { data object Idle : InstallStatus data class Pending(val sessionId: Int) : InstallStatus data class Downloading(val sessionId: Int, val progress: Float) : InstallStatus data class Installing(val sessionId: Int) : InstallStatus data class RequiresUserConfirmation(val state: SplitInstallSessionState) : InstallStatus data class Failed(val sessionId: Int, val errorCode: Int) : InstallStatus } @Stable class DynamicFeatureManager(context: Context) { private val splitInstallManager = SplitInstallManagerFactory.create(context) // Maintain a single listener for the lifetime of the manager private val listener = SplitInstallStateUpdatedListener { state -> val sessionId = state.sessionId // Capture session ID if we're expecting an install but haven't got the ID yet (race condition) if (activeSessionId == null && activeModuleName != null) { if (state.moduleNames().contains(activeModuleName)) { activeSessionId = sessionId } } if (sessionId == activeSessionId) { updateStatus(state) } } private var activeSessionId: Int? = null private var activeModuleName: String? = null private var onModuleInstalledCallback: (() -> Unit)? = null var status by mutableStateOf<InstallStatus>(InstallStatus.Idle) private set var installedModules: Set<String> by mutableStateOf(splitInstallManager.installedModules.toSet()) private set init { splitInstallManager.registerListener(listener) } fun dispose() { splitInstallManager.unregisterListener(listener) } fun installModule(moduleName: String, onModuleInstalled: () -> Unit) { if (splitInstallManager.installedModules.contains(moduleName)) { onModuleInstalled() return } // Avoid starting multiple installs if one is already in progress if (status !is InstallStatus.Idle && status !is InstallStatus.Failed) return activeModuleName = moduleName onModuleInstalledCallback = onModuleInstalled // Use a placeholder ID to indicate we are waiting for a session status = InstallStatus.Pending(-1) splitInstallManager.startInstall( SplitInstallRequest.newBuilder().addModule(moduleName).build() ).addOnSuccessListener { sessionId -> if (activeSessionId == null) { activeSessionId = sessionId } // Only update status if it hasn't progressed beyond our placeholder if (status is InstallStatus.Pending && (status as InstallStatus.Pending).sessionId == -1) { status = InstallStatus.Pending(sessionId) } }.addOnFailureListener { status = InstallStatus.Failed(-1, -1) onModuleInstalledCallback = null } } private fun clearSessionState() { activeSessionId = null activeModuleName = null onModuleInstalledCallback = null } private fun updateStatus(state: SplitInstallSessionState) { val sessionId = state.sessionId when (state.status) { SplitInstallSessionStatus.PENDING -> { status = InstallStatus.Pending(sessionId) } SplitInstallSessionStatus.DOWNLOADING -> { val progress = if (state.totalBytesToDownload > 0) { state.bytesDownloaded.toFloat() / state.totalBytesToDownload } else 0f status = InstallStatus.Downloading(sessionId, progress) } SplitInstallSessionStatus.DOWNLOADED -> { status = InstallStatus.Installing(sessionId) } SplitInstallSessionStatus.INSTALLING -> { status = InstallStatus.Installing(sessionId) } SplitInstallSessionStatus.REQUIRES_USER_CONFIRMATION -> { status = InstallStatus.RequiresUserConfirmation(state) } SplitInstallSessionStatus.INSTALLED -> { status = InstallStatus.Idle installedModules = splitInstallManager.installedModules.toSet() onModuleInstalledCallback?.invoke() clearSessionState() } SplitInstallSessionStatus.FAILED -> { status = InstallStatus.Failed(sessionId, state.errorCode) clearSessionState() } SplitInstallSessionStatus.CANCELING -> { status = InstallStatus.Pending(sessionId) } SplitInstallSessionStatus.CANCELED -> { status = InstallStatus.Idle clearSessionState() } SplitInstallSessionStatus.UNKNOWN -> { status = InstallStatus.Failed(sessionId, -1) clearSessionState() } } } fun startConfirmationDialogForResult( state: SplitInstallSessionState, launcher: ActivityResultLauncher<IntentSenderRequest> ) { splitInstallManager.startConfirmationDialogForResult(state, launcher) } fun cancelInstallModule() { activeSessionId?.let { id -> splitInstallManager.cancelInstall(id) } status = InstallStatus.Idle clearSessionState() } }
/* * Copyright 2026 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 * * http://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. */ package com.example.nav3recipes.dynamicfeature import androidx.navigation3.runtime.EntryProviderScope import androidx.navigation3.runtime.NavKey interface AppNavKey : NavKey { // By default, `toString()` is used to generate the `contentKey` for NavEntries. // Instead of overriding `toString()`, we provide a dedicated `toContentKey()` function to make // it possible to uniquely identify keys for nested objects with the same simple name // (e.g., `ModuleA.Home` vs `ModuleB.Home`), without polluting the `toString()` representation. fun toContentKey(): Any = this.toString() } /** * An extension on [EntryProviderScope] specifically for [AppNavKey]s that overrides the default * `contentKey` resolution. It explicitly resolves the key via `it.toContentKey()` instead of the default * string representation. */ inline fun <reified K : AppNavKey> EntryProviderScope<NavKey>.appEntry( noinline clazzContentKey: (key: @JvmSuppressWildcards K) -> Any = { it.toContentKey() }, metadata: Map<String, Any> = emptyMap(), noinline content: @androidx.compose.runtime.Composable (K) -> Unit, ) { addEntryProvider(K::class, clazzContentKey, { metadata }, content) }
/* * Copyright 2026 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 * * http://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. */ package com.example.nav3recipes.dynamicfeature import androidx.compose.foundation.layout.Arrangement import androidx.compose.foundation.layout.Column import androidx.compose.foundation.layout.fillMaxWidth import androidx.compose.material3.AlertDialog import androidx.compose.material3.Button import androidx.compose.material3.CircularProgressIndicator import androidx.compose.material3.ExperimentalMaterial3Api import androidx.compose.material3.MaterialTheme import androidx.compose.material3.Text import androidx.compose.material3.TextButton import androidx.compose.runtime.Composable import androidx.compose.ui.Alignment import androidx.compose.ui.Modifier import androidx.activity.compose.rememberLauncherForActivityResult import androidx.activity.result.contract.ActivityResultContracts import androidx.compose.ui.semantics.contentDescription import androidx.compose.ui.semantics.semantics import androidx.compose.ui.unit.dp import kotlin.math.roundToInt @OptIn(ExperimentalMaterial3Api::class) @Composable fun DynamicFeatureDownloadProgressDialog( dynamicFeatureManager: DynamicFeatureManager, modifier: Modifier = Modifier, ) { val status = dynamicFeatureManager.status if (status is InstallStatus.Idle) return val launcher = rememberLauncherForActivityResult( contract = ActivityResultContracts.StartIntentSenderForResult() ) { // The session status will be updated automatically via the // SplitInstallStateUpdatedListener in DynamicFeatureManager, // so no explicit handling is required here. } val progress = if (status is InstallStatus.Downloading) status.progress else 0f val progressPercentage = "${(progress * 100).roundToInt()}%" AlertDialog( onDismissRequest = {}, modifier = modifier, title = { Text(text = getStatusTitle(status)) }, text = { Column( verticalArrangement = Arrangement.spacedBy(16.dp), horizontalAlignment = Alignment.CenterHorizontally, modifier = Modifier.fillMaxWidth(), ) { if (status is InstallStatus.Downloading) { CircularProgressIndicator( progress = { progress }, modifier = Modifier.semantics { contentDescription = "Downloading: $progressPercentage" } ) Text( text = progressPercentage, style = MaterialTheme.typography.labelSmall, ) } else if (status !is InstallStatus.Failed && status !is InstallStatus.RequiresUserConfirmation) { CircularProgressIndicator() } if (status is InstallStatus.Failed) { Text( text = "Error code: ${status.errorCode}", color = MaterialTheme.colorScheme.error, style = MaterialTheme.typography.bodySmall, ) } } }, confirmButton = { if (status is InstallStatus.RequiresUserConfirmation) { Button(onClick = { dynamicFeatureManager.startConfirmationDialogForResult( status.state, launcher ) }) { Text(text = "Confirm Download") } } }, dismissButton = { TextButton(onClick = dynamicFeatureManager::cancelInstallModule) { Text(text = "Cancel") } } ) } private fun getStatusTitle(status: InstallStatus): String { return when (status) { is InstallStatus.Pending -> "Requesting..." is InstallStatus.Downloading -> "Downloading..." is InstallStatus.Installing -> "Installing..." is InstallStatus.RequiresUserConfirmation -> "Requires Confirmation" is InstallStatus.Failed -> "Installation Failed" else -> "" } }
/* * Copyright 2026 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 * * http://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. */ package com.example.nav3recipes.dynamicfeature import androidx.navigation3.runtime.EntryProviderScope import androidx.navigation3.runtime.NavKey /** * Base class for defining a dynamic feature module. * * Caches the [DynamicModuleEntryBuilder] instance to guarantee that the reflection instantiation * via [Class.forName] and [Class.newInstance] occurs exactly once per application process lifetime, * optimizing performance during recompositions when the `entryProvider` block is re-evaluated. */ abstract class DynamicModule( val entryBuilderClassName: String, val moduleName: String, ) { private var dynamicModuleEntryBuilder: DynamicModuleEntryBuilder? = null internal fun getDynamicModuleEntryBuilder(): DynamicModuleEntryBuilder { return dynamicModuleEntryBuilder ?: (Class.forName(entryBuilderClassName) .getConstructor() .newInstance() as DynamicModuleEntryBuilder).also { dynamicModuleEntryBuilder = it } } } /** * Interface that every dynamic feature module must implement to register its navigation entries. * * It is invoked by [buildDynamicEntries] to add the module's routes into the base [EntryProviderScope]. * * **Example:** * ```kotlin * class ExampleEntryBuilder : DynamicModuleEntryBuilder { * override fun EntryProviderScope<NavKey>.build() { * appEntry<ExampleModule.Screen> { * ExampleScreen() * } * } * } * ``` */ fun interface DynamicModuleEntryBuilder { fun EntryProviderScope<NavKey>.build() } fun EntryProviderScope<NavKey>.buildDynamicEntries( module: DynamicModule, ) { with(module.getDynamicModuleEntryBuilder()) { build() } }