Kotlin Android MVP+;Dagger 2 lateinit属性呈现程序尚未初始化
试图在Android上使用Dagger和Kotlin。我得到了一个例外:Kotlin Android MVP+;Dagger 2 lateinit属性呈现程序尚未初始化,android,kotlin,dagger-2,android-mvp,Android,Kotlin,Dagger 2,Android Mvp,试图在Android上使用Dagger和Kotlin。我得到了一个例外: Caused by: kotlin.UninitializedPropertyAccessException: lateinit property presenter has not been initialized at com.ad.eartquakekotlin.main.MainFragment.onViewCreated(MainFragment.kt:43) at androidx.fragme
Caused by: kotlin.UninitializedPropertyAccessException: lateinit property presenter has not been initialized
at com.ad.eartquakekotlin.main.MainFragment.onViewCreated(MainFragment.kt:43)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManager.java:1471)
at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1784)
at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManager.java:1852)
at androidx.fragment.app.BackStackRecord.executeOps(BackStackRecord.java:802)
at ...
该应用程序专门用于测试。我得到地震并在设备屏幕上显示
我只想
1.将演示者插入我的片段(视图)
2.在我的演示者中注入api
class MainPresenter (var view: MainContract.View?) : MainContract.Presenter {
private var disposable: Disposable? = null
@Inject lateinit var api : EarthquakeApi
override fun onDestroy() {
disposable?.dispose()
view = null
}
override fun loadData() {
view?.showLoading()
disposable = api.getEarthquakes()
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(
{
response ->
view?.showData(response)
view?.hideLoading()
},
{
throwable ->
view?.showMessage(throwable.message ?: "Ошибка")
view?.hideLoading()
}
)
}
我的项目结构如下:
如您所见,这里有两个模块和组件:
@Module
class ApplicationModule(private val application: Application) {
@Provides
@Singleton
fun provideApplication():Application = application
}
@Module
class MainModule (private val view: MainContract.View) {
@Provides
fun provideView(): MainContract.View {
return view
}
@Provides
fun providePresenter(): MainContract.Presenter {
return MainPresenter(view)
}
}
和组成部分:
@Component(modules = [ApplicationModule::class])
interface ApplicationComponent {
fun inject(application: Application)
fun plus (mainModule: MainModule) : MainComponent
}
及
有一个合同:
interface MainContract {
interface View {
fun showLoading()
fun hideLoading()
fun showMessage(message: String)
fun showData(data: EarthquakeRootObject)
}
interface Presenter {
fun onDestroy()
fun loadData()
}
}
应用程序类别:
class MainApp: Application() {
companion object {
lateinit var graph: ApplicationComponent
}
override fun onCreate() {
super.onCreate()
buildGraph()
}
private fun buildGraph() {
graph = DaggerApplicationComponent
.builder()
.applicationModule(ApplicationModule(this))
.build()
}
}
片段(我想使用注入的地方)
还有我的演讲者
class MainPresenter (var view: MainContract.View?) : MainContract.Presenter {
private var disposable: Disposable? = null
@Inject lateinit var api : EarthquakeApi
override fun onDestroy() {
disposable?.dispose()
view = null
}
override fun loadData() {
view?.showLoading()
disposable = api.getEarthquakes()
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(
{
response ->
view?.showData(response)
view?.hideLoading()
},
{
throwable ->
view?.showMessage(throwable.message ?: "Ошибка")
view?.hideLoading()
}
)
}
我做错了什么 您需要更换
fun inject (view : MainContract.View)
与
你需要更换
fun inject (view : MainContract.View)
与
MainComponent
code是这个问题最重要的文件,它丢失了。@EpicPandaForce已更新,谢谢。MainComponent
code是这个问题最重要的文件,它丢失了。@EpicPandaForce已更新,谢谢。但在演示者“lateinit属性api尚未初始化”中,我得到了更深入的相同异常。我需要在那里执行component.inject()吗?实际上,您缺少类MainPresenter@inject构造函数(val view
,并且不需要@inject lateinit var。谢谢。但是我得到了更深入的相同异常,在presenter“lateinit属性api尚未初始化”。我需要执行component.inject()吗那里?实际上,您缺少类MainPresenter@injectconstructor(val view
),不需要@injectlateinit变量。
fun inject(target : MainFragment)