使用 ModuleInstallClient 確保 API 可用性

如「Google Play 服務總覽」一文所述 一文:採用 Google Play 服務支援的 SDK 是由裝置端服務提供支援 並安裝在 Google 認證的 Android 裝置上為了保存 安裝在大量裝置中時,有些服務會視需要安裝 特定裝置需要相關功能才能使用例如: ML Kit 提供 在 Google Play 服務中使用模型時特別實用

最常見的情況是下載 取決於 SDK 的 AndroidManifest.xml。如要進一步控管 可讓您明確檢查模組的可用性、要求模組 安裝、監控要求狀態及處理錯誤。

請按照下列步驟,使用 ModuleInstallClient 確保 API 可用性。 請注意,下方的程式碼片段使用 TensorFlow Lite SDK (play-services-tflite-java) 做為範例程式庫,但以下步驟 適用於任何與 OptionalModuleApi 整合的程式庫。這個 隨著更多 SDK 支援,更新指南也會提供額外資訊。

事前準備

如要讓應用程式做好準備,請完成下列各節的步驟。

應用程式必要條件

請確認應用程式的版本檔案使用下列的值:

  • minSdkVersion 19 以上版本

設定應用程式

  1. 在頂層 settings.gradle 檔案中納入 Google 的 Maven 存放區Maven 中央存放區 dependencyResolutionManagement 區塊:

    dependencyResolutionManagement {
        repositories {
            google()
            mavenCentral()
        }
    }
    
  2. 在模組的 Gradle 建構檔案 (通常是 app/build.gradle) 中新增 play-services-base 和 的 Google Play 服務依附元件 play-services-tflite-java:

    dependencies {
      implementation 'com.google.android.gms:play-services-base:18.5.0'
      implementation 'com.google.android.gms:play-services-tflite-java:16.2.0-beta02'
    }
    

檢查模組可用性

  1. 取得 ModuleInstallClient 的例項:

    Kotlin

    val moduleInstallClient = ModuleInstall.getClient(context)
    

    Java

    ModuleInstallClient moduleInstallClient = ModuleInstall.getClient(context);
    
  2. 使用 OptionalModuleApi 檢查選用模組的可用性:

    Kotlin

    val optionalModuleApi = TfLite.getClient(context)
    moduleInstallClient
      .areModulesAvailable(optionalModuleApi)
      .addOnSuccessListener {
        if (it.areModulesAvailable()) {
          // Modules are present on the device...
        } else {
          // Modules are not present on the device...
        }
      }
      .addOnFailureListener {
        // Handle failure...
      }
    

    Java

    OptionalModuleApi optionalModuleApi = TfLite.getClient(context);
    moduleInstallClient
        .areModulesAvailable(optionalModuleApi)
        .addOnSuccessListener(
            response -> {
              if (response.areModulesAvailable()) {
                // Modules are present on the device...
              } else {
                // Modules are not present on the device...
              }
            })
        .addOnFailureListener(
            e -> {
              // Handle failure…
            });
    

傳送延遲安裝要求

  1. 取得 ModuleInstallClient 的例項:

    Kotlin

    val moduleInstallClient = ModuleInstall.getClient(context)
    

    Java

    ModuleInstallClient moduleInstallClient = ModuleInstall.getClient(context);
    
  2. 傳送延遲要求:

    Kotlin

    val optionalModuleApi = TfLite.getClient(context)
    moduleInstallClient.deferredInstall(optionalModuleApi)
    

    Java

    OptionalModuleApi optionalModuleApi = TfLite.getClient(context);
    moduleInstallClient.deferredInstall(optionalModuleApi);
    

傳送緊急模組安裝要求

  1. 取得 ModuleInstallClient 的例項:

    Kotlin

    val moduleInstallClient = ModuleInstall.getClient(context)
    

    Java

    ModuleInstallClient moduleInstallClient = ModuleInstall.getClient(context);
    
  2. (選用) 建立 InstallStatusListener 來處理安裝狀態 更新。

    要在自訂的使用者介面中監控下載進度 (適用於 例如進度列),您可以建立 InstallStatusListener 更新安裝狀態。

    Kotlin

    inner class ModuleInstallProgressListener : InstallStatusListener {
      override fun onInstallStatusUpdated(update: ModuleInstallStatusUpdate) {
        // Progress info is only set when modules are in the progress of downloading.
        update.progressInfo?.let {
          val progress = (it.bytesDownloaded * 100 / it.totalBytesToDownload).toInt()
          // Set the progress for the progress bar.
          progressBar.setProgress(progress)
        }
    
        if (isTerminateState(update.installState)) {
          moduleInstallClient.unregisterListener(this)
        }
      }
    
      fun isTerminateState(@InstallState state: Int): Boolean {
        return state == STATE_CANCELED || state == STATE_COMPLETED || state == STATE_FAILED
      }
    }
    
    val listener = ModuleInstallProgressListener()
    

    Java

    static final class ModuleInstallProgressListener implements InstallStatusListener {
        @Override
        public void onInstallStatusUpdated(ModuleInstallStatusUpdate update) {
          ProgressInfo progressInfo = update.getProgressInfo();
          // Progress info is only set when modules are in the progress of downloading.
          if (progressInfo != null) {
            int progress =
                (int)
                    (progressInfo.getBytesDownloaded() * 100 / progressInfo.getTotalBytesToDownload());
            // Set the progress for the progress bar.
            progressBar.setProgress(progress);
          }
          // Handle failure status maybe…
    
          // Unregister listener when there are no more install status updates.
          if (isTerminateState(update.getInstallState())) {
    
            moduleInstallClient.unregisterListener(this);
          }
        }
    
        public boolean isTerminateState(@InstallState int state) {
          return state == STATE_CANCELED || state == STATE_COMPLETED || state == STATE_FAILED;
        }
      }
    
    InstallStatusListener listener = new ModuleInstallProgressListener();
    
  3. 設定 ModuleInstallRequest,並將 OptionalModuleApi 新增至 要求:

    Kotlin

    val optionalModuleApi = TfLite.getClient(context)
    val moduleInstallRequest =
      ModuleInstallRequest.newBuilder()
        .addApi(optionalModuleApi)
        // Add more APIs if you would like to request multiple optional modules.
        // .addApi(...)
        // Set the listener if you need to monitor the download progress.
        // .setListener(listener)
        .build()
    

    Java

    OptionalModuleApi optionalModuleApi = TfLite.getClient(context);
    ModuleInstallRequest moduleInstallRequest =
        ModuleInstallRequest.newBuilder()
            .addApi(optionalModuleApi)
            // Add more API if you would like to request multiple optional modules
            //.addApi(...)
            // Set the listener if you need to monitor the download progress
            //.setListener(listener)
            .build();
    
  4. 傳送安裝要求:

    Kotlin

    moduleInstallClient
      .installModules(moduleInstallRequest)
      .addOnSuccessListener {
        if (it.areModulesAlreadyInstalled()) {
          // Modules are already installed when the request is sent.
        }
      }
      .addOnFailureListener {
        // Handle failure…
      }
    

    Java

    moduleInstallClient.installModules(moduleInstallRequest)
        .addOnSuccessListener(
            response -> {
              if (response.areModulesAlreadyInstalled()) {
                // Modules are already installed when the request is sent.
              }
            })
        .addOnFailureListener(
            e -> {
              // Handle failure...
            });
    

使用 FakeModuleInstallClient 進行本機測試

Google Play 服務 SDK 提供的 FakeModuleInstallClient,可讓您 使用依附元件模擬測試中的模組安裝 API 結果 插入內容

應用程式必要條件

設定應用程式以使用 Hilt 依附元件插入架構

在測試中將 ModuleInstallClient 替換為 FakeModuleInstallClient

  1. 新增依附元件:

    在模組的 Gradle 建構檔案 (通常是 app/build.gradle) 中新增 以下項目中適用於「play-services-base-testing」的 Google Play 服務依附元件: 測試。

      dependencies {
        // other dependencies...
    
        testImplementation 'com.google.android.gms:play-services-base-testing:16.1.0'
      }
    
  2. 建立 Hilt 模組以提供 ModuleInstallClient

    Kotlin

    @Module
    @InstallIn(ActivityComponent::class)
    object ModuleInstallModule {
    
      @Provides
      fun provideModuleInstallClient(
        @ActivityContext context: Context
      ): ModuleInstallClient = ModuleInstall.getClient(context)
    }
    

    Java

    @Module
    @InstallIn(ActivityComponent.class)
    public class ModuleInstallModule {
      @Provides
      public static ModuleInstallClient provideModuleInstallClient(
        @ActivityContext Context context) {
        return ModuleInstall.getClient(context);
      }
    }
    
  3. 在活動中插入 ModuleInstallClient

    Kotlin

    @AndroidEntryPoint
    class MyActivity: AppCompatActivity() {
      @Inject lateinit var moduleInstallClient: ModuleInstallClient
    
      ...
    }
    

    Java

    @AndroidEntryPoint
    public class MyActivity extends AppCompatActivity {
      @Inject ModuleInstallClient moduleInstallClient;
    
      ...
    }
    
  4. 替換測試中的繫結:

    Kotlin

    @UninstallModules(ModuleInstallModule::class)
    @HiltAndroidTest
    class MyActivityTest {
      ...
      private val context:Context = ApplicationProvider.getApplicationContext()
      private val fakeModuleInstallClient = FakeModuleInstallClient(context)
      @BindValue @JvmField
      val moduleInstallClient: ModuleInstallClient = fakeModuleInstallClient
    
      ...
    }
    

    Java

    @UninstallModules(ModuleInstallModule.class)
    @HiltAndroidTest
    class MyActivityTest {
      ...
      private static final Context context = ApplicationProvider.getApplicationContext();
      private final FakeModuleInstallClient fakeModuleInstallClient = new FakeModuleInstallClient(context);
      @BindValue ModuleInstallClient moduleInstallClient = fakeModuleInstallClient;
    
      ...
    }
    

模擬模組可用性

Kotlin

@Test
fun checkAvailability_available() {
  // Reset any previously installed modules.
  fakeModuleInstallClient.reset()

  val availableModule = TfLite.getClient(context)
  fakeModuleInstallClient.setInstalledModules(api)

  // Verify the case where modules are already available...
}

@Test
fun checkAvailability_unavailable() {
  // Reset any previously installed modules.
  fakeModuleInstallClient.reset()

  // Do not set any installed modules in the test.

  // Verify the case where modules unavailable on device...
}

@Test
fun checkAvailability_failed() {
  // Reset any previously installed modules.
  fakeModuleInstallClient.reset()

  fakeModuleInstallClient.setModulesAvailabilityTask(Tasks.forException(RuntimeException()))

  // Verify the case where an RuntimeException happened when trying to get module's availability...
}

Java

@Test
public void checkAvailability_available() {
  // Reset any previously installed modules.
  fakeModuleInstallClient.reset();

  OptionalModuleApi optionalModuleApi = TfLite.getClient(context);
  fakeModuleInstallClient.setInstalledModules(api);

  // Verify the case where modules are already available...
}

@Test
public void checkAvailability_unavailable() {
  // Reset any previously installed modules.
  fakeModuleInstallClient.reset();

  // Do not set any installed modules in the test.

  // Verify the case where modules unavailable on device...
}

@Test
public void checkAvailability_failed() {
  fakeModuleInstallClient.setModulesAvailabilityTask(Tasks.forException(new RuntimeException()));

  // Verify the case where an RuntimeException happened when trying to get module's availability...
}

模擬延遲安裝要求的結果

Kotlin

@Test
fun deferredInstall_success() {
  fakeModuleInstallClient.setDeferredInstallTask(Tasks.forResult(null))

  // Verify the case where the deferred install request has been sent successfully...
}

@Test
fun deferredInstall_failed() {
  fakeModuleInstallClient.setDeferredInstallTask(Tasks.forException(RuntimeException()))

  // Verify the case where an RuntimeException happened when trying to send the deferred install request...
}

Java

@Test
public void deferredInstall_success() {
  fakeModuleInstallClient.setDeferredInstallTask(Tasks.forResult(null));

  // Verify the case where the deferred install request has been sent successfully...
}

@Test
public void deferredInstall_failed() {
  fakeModuleInstallClient.setDeferredInstallTask(Tasks.forException(new RuntimeException()));

  // Verify the case where an RuntimeException happened when trying to send the deferred install request...
}

模擬緊急安裝要求的結果

Kotlin

@Test
fun installModules_alreadyExist() {
  // Reset any previously installed modules.
  fakeModuleInstallClient.reset();

  OptionalModuleApi optionalModuleApi = TfLite.getClient(context);
  fakeModuleInstallClient.setInstalledModules(api);

  // Verify the case where the modules already exist when sending the install request...
}

@Test
fun installModules_withoutListener() {
  // Reset any previously installed modules.
  fakeModuleInstallClient.reset();

  // Verify the case where the urgent install request has been sent successfully...
}

@Test
fun installModules_withListener() {
  // Reset any previously installed modules.
  fakeModuleInstallClient.reset();

  // Generates a ModuleInstallResponse and set it as the result for installModules().
  val moduleInstallResponse = FakeModuleInstallUtil.generateModuleInstallResponse()
  fakeModuleInstallClient.setInstallModulesTask(Tasks.forResult(moduleInstallResponse))

  // Verify the case where the urgent install request has been sent successfully...

  // Generates some fake ModuleInstallStatusUpdate and send it to listener.
  val update = FakeModuleInstallUtil.createModuleInstallStatusUpdate(
    moduleInstallResponse.sessionId, STATE_COMPLETED)
  fakeModuleInstallClient.sendInstallUpdates(listOf(update))

  // Verify the corresponding updates are handled correctly...
}

@Test
fun installModules_failed() {
  fakeModuleInstallClient.setInstallModulesTask(Tasks.forException(RuntimeException()))

  // Verify the case where an RuntimeException happened when trying to send the urgent install request...
}

Java

@Test
public void installModules_alreadyExist() {
  // Reset any previously installed modules.
  fakeModuleInstallClient.reset();

  OptionalModuleApi optionalModuleApi = TfLite.getClient(context);
  fakeModuleInstallClient.setInstalledModules(api);

  // Verify the case where the modules already exist when sending the install request...
}

@Test
public void installModules_withoutListener() {
  // Reset any previously installed modules.
  fakeModuleInstallClient.reset();

  // Verify the case where the urgent install request has been sent successfully...
}

@Test
public void installModules_withListener() {
  // Reset any previously installed modules.
  fakeModuleInstallClient.reset();

  // Generates a ModuleInstallResponse and set it as the result for installModules().
  ModuleInstallResponse moduleInstallResponse =
      FakeModuleInstallUtil.generateModuleInstallResponse();
  fakeModuleInstallClient.setInstallModulesTask(Tasks.forResult(moduleInstallResponse));

  // Verify the case where the urgent install request has been sent successfully...

  // Generates some fake ModuleInstallStatusUpdate and send it to listener.
  ModuleInstallStatusUpdate update = FakeModuleInstallUtil.createModuleInstallStatusUpdate(
      moduleInstallResponse.getSessionId(), STATE_COMPLETED);
  fakeModuleInstallClient.sendInstallUpdates(ImmutableList.of(update));

  // Verify the corresponding updates are handled correctly...
}

@Test
public void installModules_failed() {
  fakeModuleInstallClient.setInstallModulesTask(Tasks.forException(new RuntimeException()));

  // Verify the case where an RuntimeException happened when trying to send the urgent install request...
}