WendyYanto

class MainActivity: AppCompatActivity() {
  
  @Inject
  lateinit var mainPresenter: MainPresenter
  
  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)

    Injector.inject(MainModule::class, this)
    

WendyYanto

object Injector {
  
  fun <T : InjectorModule, R : Any> inject(kClass: KClass<T>, entryPointClass: R) {
    // get all provider methods
    val methods = kClass.java.declaredMethods
      .filter { method -> method.isAnnotationPresent(Provides::class.java) }
      
    // construct module instance
    val moduleInstance = kClass.java.newInstance()
    

WendyYanto

class MainActivity: AppCompatActivity() {
  
  @Inject
  lateinit var mainPresenter: MainPresenter
  
  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)

    // inject mainPresenter here
    

WendyYanto

@Retention(AnnotationRetention.RUNTIME)
@Target(AnnotationTarget.FIELD, AnnotationTarget.CONSTRUCTOR)
annotation class Inject

WendyYanto

object Injector {
  
  fun <T : InjectorModule, R : Any> inject(kClass: KClass<T>, entryPointClass: R) {
    // get all provider methods
    val methods = kClass.java.declaredMethods
      .filter { method -> method.isAnnotationPresent(Provides::class.java) }
      
    // construct module instance
    val moduleInstance = kClass.java.newInstance()
    

WendyYanto

interface InjectorModule {
  
}

WendyYanto

class MainModule: InjectorModule {
 
  @Provides
  fun provideMainPresenter(): MainPresenter {
    return MainPresenterImpl()
  }
}

WendyYanto

@Retention(AnnotationRetention.RUNTIME)
@Target(AnnotationTarget.FUNCTION)
annotation class Provides

WendyYanto

class MainModule: InjectorModule {
 
  fun provideMainPresenter(): MainPresenter {
    return MainPresenterImpl()
  }
}

WendyYanto

object Injector {
  
  fun inject()
}