android - 刀柄 : lateinit property repository has not been initialized in ViewModel

Question

我在带有 HILT 的多模块 android 项目中面临这个问题。

 kotlin.UninitializedPropertyAccessException: lateinit property repository has not been initialized in MyViewModel

我的模块是

应用模块

Viewmodel 模块

用例模块

数据源模块

'应用模块'

@AndroidEntryPoint
class MainFragment : Fragment() {
private lateinit var viewModel: MainViewModel
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                          savedInstanceState: Bundle?): View {
    return inflater.inflate(R.layout.main_fragment, container, false)
}
override fun onActivityCreated(savedInstanceState: Bundle?) {
    super.onActivityCreated(savedInstanceState)
    viewModel = ViewModelProviders.of(this).get(MainViewModel::class.java)
    viewModel.test()
}}

'ViewModel 模块'

class MainViewModel @ViewModelInject constructor(private val repository: MyUsecase): ViewModel() {
fun test(){
    repository.test()
}}

'用例模块'

class MyUsecase @Inject constructor() {

@Inject
lateinit var feature: Feature

fun doThing() {
    feature.doThing()
}

@Module
@InstallIn(ApplicationComponent::class)
object FeatureModule {
    @Provides
    fun feature(realFeature: RealFeature): Feature = realFeature
}
}

“数据源模块”

interface Feature {
fun doThing()
}

class RealFeature : Feature {
override fun doThing() {
    Log.v("Feature", "Doing the thing!")
}
}

依赖项是
MyFragment ---> MyViewModel ---> MyUseCase ---> DataSource
我对这段代码做错了什么，请纠正它。

Answer 1

在您的 Activity 类上方，您必须添加注释 @AndroidEntryPoint
如下:
@AndroidEntryPoint
类 MainActivity : AppCompatActivity() {