[英]Dagger failing to inject Application context
I have dagger set up to manage fragments and viewmodels.我已经设置了匕首来管理片段和视图模型。 I need to pass application context to my view models in order to instantiate and communicate with the repository class.我需要将应用程序上下文传递给我的视图模型,以便实例化存储库类并与之通信。 When I try to do this I get an error from dagger stating:当我尝试执行此操作时,我收到了来自 dagger 的错误说明:
error: [Dagger/DependencyCycle] Found a dependency cycle:
public abstract interface AppComponent {
^
com.example.framework.BaseApplication is injected at
com.example.di.AppModule.provideAppContext(application)
com.example.framework.BaseApplication is injected at
com.example.di.MainViewModelModule.provideMainViewModelFactory(application, �)
androidx.lifecycle.ViewModelProvider.Factory is injected at
com.example.framework.presentation.common.MainFragmentFactory(viewModelFactory)
com.example.framework.presentation.common.MainFragmentFactory is injected at
com.example.framework.presentation.main.MainActivity.fragmentFactory
com.example.framework.presentation.main.MainActivity is injected at
I am new to dagger so I am struggling to identify the root cause of this issue and how to implement a fix.我是 Dagger 新手,所以我正在努力确定此问题的根本原因以及如何实施修复。 Apologies for the amount of code in this question but dagger has a number of classes where the problem could be.对这个问题中的代码量表示歉意,但 dagger 有许多可能出现问题的类。
APP COMPONENT应用组件
@Component(
modules = [
AppModule::class,
MainViewModelModule::class,
MainFragmentFactoryModule::class
]
)
interface AppComponent {
@Component.Builder
interface Builder {
@BindsInstance
fun application(application: Application): Builder
fun build(): AppComponent
}
fun inject(mainActivity: MainActivity)
APP MODULE应用模块
@ExperimentalCoroutinesApi
@FlowPreview
@Module
object AppModule {
@JvmStatic
@Provides
@Singleton
fun provideAppContext(application: BaseApplication): BaseApplication{
return application
}
VIEW MODEL MODULE查看模型模块
@ExperimentalCoroutinesApi
@FlowPreview
@Module
object MainViewModelModule {
@Singleton
@JvmStatic
@Provides
fun provideMainViewModelFactory(
application: BaseApplication,
editor: SharedPreferences.Editor,
sharedPreferences: SharedPreferences
): ViewModelProvider.Factory{
return MainViewModelFactory(
application = application,
editor = editor,
sharedPreferences = sharedPreferences
)
}
VIEW MODEL FACTORY查看模型工厂
@FlowPreview
@ExperimentalCoroutinesApi
@Singleton
class MainViewModelFactory
@Inject
constructor(
private val application: BaseApplication,
private val editor: SharedPreferences.Editor,
private val sharedPreferences: SharedPreferences
) : ViewModelProvider.Factory {
override fun <T : ViewModel> create(modelClass: Class<T>): T {
return when(modelClass){
ViewModelUsers::class.java -> {
ViewModelUsers(
application = application,
editor = editor,
sharedPreferences = sharedPreferences
) as T
}
VIEW MODEL查看模型
@ExperimentalCoroutinesApi
@FlowPreview
@Singleton
class ViewModelUsers
@Inject
constructor(
application: BaseApplication,
private val editor: SharedPreferences.Editor,
sharedPreferences: SharedPreferences
): ViewModel() {
private var repoUsers = RepoUsers(application)
Many ways to fix it but the simple way is you should change to BaseApplication
and remove AppModule
class because it already provides by @BindsInstance
annotation修复它的方法很多,但最简单的方法是您应该更改为BaseApplication
并删除AppModule
类,因为它已经由@BindsInstance
注释提供
@Component(
modules = [
MainViewModelModule::class,
MainFragmentFactoryModule::class
]
)
interface AppComponent {
@Component.Builder
interface Builder {
@BindsInstance
fun application(application: BaseApplication): Builder
fun build(): AppComponent
}
fun inject(mainActivity: MainActivity)
将存储库注入视图模型解决了这个问题,而不是尝试通过链传递应用程序上下文。
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