如何使用 Kodein 实例化 Factory class 的许多参数

Question

我正在使用 Kodein 作为我的 kotlin 项目的注入依赖项。所以我有一个像下面这样的 ViewModel 工厂

class ReadViewModelFactory(private val readRepository: ReadRepositoryImpl, private val activity: ReadActivity) : ViewModelProvider.NewInstanceFactory() {

    @Suppress("UNCHECKED_CAST")
    override fun <T : ViewModel?> create(modelClass: Class<T>): T {

        val guid = activity.intent.getIntExtra(Constants.EXTRA_GUID, 0)
        val pubDate = activity.intent.getStringExtra(Constants.EXTRA_DATE)
        val title = activity.intent.getStringExtra(Constants.EXTRA_TITLE)
        val headImage = activity.intent.getStringExtra(Constants.EXTRA_IMAGE_URL)
        val kanal = activity.intent.getStringExtra(Constants.EXTRA_KANAL_READ)
        val intentRead = IntentRead(guid, pubDate, title, headImage, kanal)
        return ReadViewModel(readRepository, intentRead) as T
    }
}

然后，在我的应用程序 class 中，我创建了：

class App : MultiDexApplication(), KodeinAware{

    override val kodein = Kodein.lazy {
        import(androidXModule(this@App))

        bind() from singleton { NetworkConnectionInterceptor(instance()) }
        bind() from singleton { ApiService(instance()) }
        bind() from provider { ReadViewModelFactory(instance(),instance())}

    }

    override fun onCreate() {
        super.onCreate()
    }
}

如您所见，我的 ReadViewModelFactory 有两个参数。但是当我运行我的应用程序崩溃发生在 ReadActivity。控制台日志说了什么

java.lang.RuntimeException: Unable to start activity ComponentInfo{id.my.app/id.my.app.ui.read.ReadActivity}: org.kodein.di.Kodein$NotFoundException: No binding found for bind() with ?().? { ? } Registered in this Kodein container:

我的 ReadActivity 如下所示：

class ReadActivity : AppCompatActivity(), KodeinAware{

  override val kodein by kodein()

    private val factory : ReadViewModelFactory by instance()

 .......

}

全栈跟踪

08-21 11:23:54.807 27186-27186/id.my.app E/AndroidRuntime: FATAL EXCEPTION: main Process: id.my.app, PID: 27186 java.lang.RuntimeException: Unable to start activity ComponentInfo{id.my.app/id.grid.app.ui.read.ReadActivity}: org.kodein.di.Kodein$NotFoundException: No binding found for bind() with ?().? { ? } Registered in this Kodein container: bind() with provider { ReadViewModelFactory } bind() with singleton { HomeFragmentRepositoryImpl } bind() with provider { HomeFragmentViewModelFactory } bind() with provider { HomeViewModelFactory } bind() with singleton { NetworkConnectionInterceptor } bind() with singleton { HomeRepositoryImpl } bind() with singleton { ReadRepositoryImpl } bind() with singleton { ApiService } module ⁣androidModule { bind(tag = "externalCache") with contexted().provider { File } bind() with contexted().provider { MediaProjectionManager } bind() with contexted().provider { JobScheduler } bind(tag = "files") with contexted().provider { File } bind(tag = "cache") with contexted().provider { File } bind() with contexted().provider { TvInputManager } bind() with contexted().provider { PrintManager } bind(tag = "packageCodePath") with contexted().provider { String } bind() with contexted().provider { AccountManager } bind() with contexted().provider { UiModeManager } bind() with contexted().provider { ApplicationInfo } bind() with contexted().provider { Looper } bind() with contexted().provider { WindowManager } bind() with contexted().provider { UsageStatsManager } bind() with contexted().provider { InputMethodManager } bind() with contexted().provider { MediaRouter } bind() with contexted().provider { ActivityManager } bind() with contexted().provider { RestrictionsManager } bind() with contexted().provider { SensorManager } bind() with contexted().provider { LauncherApps } bind() with contexted().provider { Resources.Theme } bind() with contexted().provider { DropBoxManager } bind() with contexted().provider { AccessibilityManager } bind() with contexted().provider { AssetManager } bind() with contexted().provider { CarrierConfigManager } bind() with contexted().provider { AudioManager } bind() with contexted().provider { MidiManager } bind() with contexted().provider { MediaSessionManager } bind() with contexted().provider { InputManager } bind() with contexted().provider { WallpaperManager } bind() with contexted().provider { PackageManager } bind() with contexted().provider { DownloadManager } bind() with contexted().provider { BatteryManager } bind() with contexted().provider { SharedPreferences } bind

Answer 1

你的classReadViewModelFactory有一个ReadActivity构造函数参数，在Kodein中没有绑定

有两种方法可以解决这个问题：

1.使用上下文

因为你直接在ReadActivity中检索，所以activity是上下文，所以你可以绑定上下文：

bind() from contexted<ReadActivity>.provider { ReadViewModelFactory(instance(), context)}

然后，在ReadActivity中，你可以这样检索：

private val factory : ReadViewModelFactory by instance()

然而，在另一个 class 中，您必须明确指定上下文：

private val factory : ReadViewModelFactory by on(activity).instance()

2。使用工厂

您可以将 activity 作为参数传递，其优点是在任何地方都具有相同的检索语法：

bind() from factory { activity: ReadActivity -> ReadViewModelFactory(instance(), activity)}

然后，在检索中：

private val factory : ReadViewModelFactory by instance(arg = activity)

如何使用 Kodein 实例化 Factory class 的许多参数

How to instance many parameters for Factory class with Kodein

android

dependency-injection

mvvm

kotlin

kodein