java - 带有 Dagger 和 AndroidInjectors 的子模块

Question

我已经使用 Android Injector 之前的 Dagger 风格有一段时间了，现在决定尝试新的方法。到现在为止，我基本上是这样声明 AppComponent 的:

@Singleton
@Component(
        modules = [ApplicationModule::class,
            NetModule::class,
            ApiModule::class,
            AnalyticsModule::class,
            DbModule::class,
            RepositoryModule::class,
            InteractorModule::class]
)
interface ApplicationComponent {
    fun inject(app: MyApp)
    fun plus(controllerModule: ControllerModule): ControllerComponent
}

然后我会像这样注入(inject)我的Activities/Fragments/Services/Dialogs:

class MyActivity : AppCompatActivity() {
...
    val component by lazy {
            (application as MyApp)
                    .applicationComponent
                    .plus(
                            ControllerModule(this)
                    )
        }

    override fun inject() {
            component.inject(this)
        }
...
}

基本上，我有一个顶级应用程序组件，其中包含应用程序遍历模块，然后是一个 Activity 级组件 (ControllerComponent)，每个 Activity 都有实例，对所有 Activity 都是通用的。

现在我已切换到新方法，我可以像这样创建我的组件:

@Singleton
@Component(
        modules = [
            AndroidSupportInjectionModule::class,
            AppModule::class,
            NetModule::class,
            ApiModule::class,
            AnalyticsModule::class,
            DbModule::class,
            RepositoryModule::class,
            InteractorModule::class
        ]
)
interface AppComponent : AndroidInjector<SoulpicksApp> {

    @Component.Builder
    interface Builder {
        fun build(): AppComponent
        @BindsInstance
        fun application(application: SoulpicksApp): Builder
    }

}

让我的应用扩展 DaggerApplication:

open class MyApp : DaggerApplication() {


    override fun applicationInjector(): AndroidInjector<out DaggerApplication> = DaggerAppComponent.builder().application(this).build()

}

我的Activities/Fragments分别扩展了DaggerAppCompatActivty/DaggerFragment:

class MyActivity : DaggerAppCompatActivity() {

...
}

我知道这应该会自动连接所有 Activity 依赖项，前提是 Dagger 已正确设置。但是我还没有声明我的 ControllerModule/Component 所以当然在运行我的应用程序时我得到:

e: /Users/user/dev/my-android/app/build/generated/source/kapt/devDebug/com/myapp/android/di/activity/ActivityBinder_ContributesMyActivity.java:28: error: @Subcomponent.Builder is missing setters for required modules or subcomponents: [com.myapp.android.di.controller.ControllerModule]

我之前知道我是通过使用 plus() 方法并显式注入(inject)(这是我在这里试图避免的)在每个 Activity 上创建这个组件，我现在该怎么做？

此外，我的应用程序中有一些 BottomSheetDialogFragments 和 JobServiceIntents，但没有等效的 DaggerBottomSheedDialogFragments/DaggerJobServiceIntents扩展自，我该如何解决？

Controller 模块:

@Module
class ControllerModule(val activity: androidx.fragment.app.FragmentActivity) {

    @Provides
    @ControllerScope
    fun context(): Context = activity

    @Provides
    @ControllerScope
    fun activity() = activity

    @Provides
    @ControllerScope
    fun layoutInflater() = activity.layoutInflater

    @Provides
    @ControllerScope
    fun fragmentManager(): androidx.fragment.app.FragmentManager = activity.supportFragmentManager

    @Provides
    @ControllerScope
    fun provideNavigationController(activity: androidx.fragment.app.FragmentActivity, analyticsManager: AnalyticsCompositeManager) = NavigationController(activity, analyticsManager)

    @Provides
    @ControllerScope
    fun providePackageUtils(activity: androidx.fragment.app.FragmentActivity) : PackageUtils = PackageUtilsImpl(activity)
}

@luis_cortes 回答后的变化:

包 io.soulpicks.android.di.activity

@Module
abstract class ActivityBinder {

    @ControllerScope
    @ContributesAndroidInjector(modules = [ControllerModule::class])
    abstract fun constributesSplashActivity(): SplashActivity

    @ControllerScope
    @ContributesAndroidInjector(modules = [ControllerModule::class])
    abstract fun contributesDashboardActivity(): DashboardActivity

    ....


}

Controller 模块:

@Module(includes = [ViewContainerModule::class])
class ControllerModule {


    @Provides
    @ControllerScope
    fun context(activity: DaggerAppCompatActivity): Context = activity.applicationContext

    @Provides
    @ControllerScope
    fun layoutInflater(activity: DaggerAppCompatActivity) : LayoutInflater = activity.layoutInflater

    @Provides
    @ControllerScope
    fun fragmentManager(activity: DaggerAppCompatActivity): FragmentManager = activity.supportFragmentManager

    @Provides
    @ControllerScope
    fun navigationController(activity: DaggerAppCompatActivity, analyticsManager: AnalyticsCompositeManager): NavigationController = NavigationController(activity, analyticsManager)

    @Provides
    @ControllerScope
    fun providePackageUtils(activity: DaggerAppCompatActivity): PackageUtils = PackageUtilsImpl(activity)
}

错误:

e: /Users/kelmer/dev/myapp-android/app/build/tmp/kapt3/stubs/devDebug/io/myapp/android/di/application/AppComponent.java:8: error: [Dagger/MissingBinding] com.myapp.android.managers.PackageUtils cannot be provided without an @Provides-annotated method.
public abstract interface AppComponent extends dagger.android.AndroidInjector<com.myapp.android.MyApp> {
                ^
      com.myapp.android.managers.PackageUtils is injected at
          com.myapp.android.ui.invite.SendInviteViewModel(packageUtils, …)
      com.myapp.android.ui.invite.SendInviteViewModel is injected at
          com.myapp.android.di.viewmodel.ViewModelModule.sendInviteViewModel$app_devDebug(sendInviteViewModel)
      java.util.Map<java.lang.Class<? extends androidx.lifecycle.ViewModel>,javax.inject.Provider<androidx.lifecycle.ViewModel>> is injected at
          com.myapp.android.di.viewmodel.MyappViewModelFactory(viewModels)
      com.myapp.android.di.viewmodel.MyappViewModelFactory is injected at
          com.myapp.android.di.viewmodel.ViewModelModule.bindViewModelFactory$app_devDebug(factoryMyapp)
      androidx.lifecycle.ViewModelProvider.Factory is injected at
          com.myapp.android.base.BaseActivity.viewModelFactory
      com.myapp.android.ui.splash.SplashActivity is injected at
          dagger.android.AndroidInjector.inject(T) [com.myapp.android.di.application.AppComponent → com.myapp.android.di.activity.ActivityBinder_ConstributesSplashActivity.SplashActivitySubcomponent]
  It is also requested at:
      com.myapp.android.ui.dashboard.friends.contact.ContactSyncViewModel(…, packageUtils, …)
      com.myapp.android.views.appchoosedialog.AppChooserViewModel(packageUtils)
  The following other entry points also depend on it:
      dagger.android.AndroidInjector.inject(T) [com.myapp.android.di.application.AppComponent → com.myapp.android.di.activity.ActivityBinder_ContributesDashboardActivity.DashboardActivitySubcomponent]

https://github.com/kelmer44/mvvm-base

branch master 是当前的实现(没有 dagger-android)branch chore/dagger-rework 是我的尝试

Answer 1

更新

我设法让示例项目与原始解决方案进行一些非常小的调整。我已经为后代更新了下面的答案，并用粗体标记了新的或已更改的步骤。

注意:示例项目中的 ControllerModule 需要进行一些非常小的调整，这些调整也是必要的，但下面的答案最适用于每个人网站上的其他内容，所以我选择在这里省略它们。

---

• 创建一个名为 MainActivityModule 的文件，其中包含以下内容:

@Module
abstract class MainActivityModule {
   @Binds @ControllerScope
   abstract fun bindsActivity(mainActivity: MainActivity): FragmentActivity
}

• 将此添加到安装在您的 AppComponent 上的模块:

@ContributesAndroidInjector([ControllerModule::class, MainActivityModule::class])
@ControllerScope 
abstract fun contributesMyActivity(): MyActivity

• 删除 val activity: androidx.fragment.app.FragmentActivity 作为 ControllerModule

  构造函数的属性

• 像这样更改您的 @Provides 方法以接收 FragmentActivity:

@Provides
@ControllerScope
fun providesContext(activity: FragmentActivity): Context = activity

对于您的其他类，这仅取决于您是否控制它们的实例化时间和方式。如果这样做，只需使用常规构造函数注入(inject)即可。