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Scoping Dagger Components with ViewModels
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@Scope | |
@Retention(AnnotationRetention.RUNTIME) | |
annotation class ActivityScope |
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dependencies { | |
//other dependencies... | |
implementation 'androidx.core:core-ktx:1.1.0' | |
implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.1.0' | |
implementation 'com.google.dagger:dagger:2.24' | |
kapt 'com.google.dagger:dagger-compiler:2.24' | |
} |
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abstract class ScopedComponent : ViewModel() | |
@MainThread | |
inline fun <reified C : ScopedComponent> AppCompatActivity.components( | |
noinline ownerProducer: () -> ViewModelStoreOwner = { this }, | |
noinline factory: () -> C | |
) = viewModels<C> { viewModelFactoryOf { factory() } } | |
@MainThread | |
inline fun <reified VM : ViewModel> viewModelFactoryOf( | |
noinline factory: () -> VM | |
) = object : ViewModelProvider.Factory { | |
@Suppress("UNCHECKED_CAST") | |
override fun <VM : ViewModel?> create(modelClass: Class<VM>): VM { | |
return factory() as VM | |
} | |
} |
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class MainActivity: AppCompatActivity() { | |
@Inject | |
lateinit var mainPresenter: MainPresenter | |
private val component: MainComponent by components { | |
DaggerMainComponent.create() | |
} | |
override fun onCreate(savedInstanceState: Bundle?) { | |
super.onCreate(savedInstanceState) | |
setContentView(R.layout.main_activity) | |
component.inject(this) | |
mainPresenter.counter++ | |
findViewById<TextView>(R.id.message).text = mainPresenter.counter.toString() | |
} | |
} |
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@ActivityScope | |
@Component | |
abstract class MainComponent : ScopedComponent() { | |
abstract fun inject(target: MainActivity) | |
} |
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@ActivityScope | |
class MainPresenter @Inject constructor( | |
val mainRepository: MainRepository | |
) { | |
var counter: Int = 0 | |
} |
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@Reusable | |
class MainRepository @Inject constructor() |
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