Dagger 2 在Android中的使用——Activity篇

Dagger2_with_android_part1_1.kt

/**
 * author: jixiaoyong
 * email: jixiaoyong1995@gmail.com
 * website: https://jixiaoyong.github.io
 * date: 2019/1/27
 * description: todo
 */
class MainApplication : HasActivityInjector, Application() {

    override fun onCreate() {
        super.onCreate()
        DaggerAppComponent.create().inject(this)
    }

    @Inject
    lateinit var dispatchActivityInjector: DispatchingAndroidInjector<Activity>

    override fun activityInjector() = dispatchActivityInjector
}

Dagger2_with_android_part1_2.kt

/**
 * author: jixiaoyong
 * email: jixiaoyong1995@gmail.com
 * website: https://jixiaoyong.github.io
 * date: 2019/1/27
 * description: todo
 */
class MainActivity : AppCompatActivity() {

    @Inject
    lateinit var waitForInjectClass: WaitForInjectClass

    override fun onCreate(savedInstanceState: Bundle?) {
        AndroidInjection.inject(this)
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_dagger2_x_android_main)

        Log.d("TAG", "The Class is $waitForInjectClass")
    }
}

Dagger2_with_android_part1_3.kt

/**
 * author: jixiaoyong
 * email: jixiaoyong1995@gmail.com
 * website: https://jixiaoyong.github.io
 * date: 2019/1/27
 * description: todo
 */

@Component(modules = [AndroidInjectionModule::class, MainActivityModule::class])
interface AppComponent {

    fun inject(application: MainApplication)
}

@Subcomponent
interface MainActivitySubComponent : AndroidInjector<MainActivity> {

    @Subcomponent.Builder
    abstract class Builder : AndroidInjector.Builder<MainActivity>()

}

@Module(includes = [MainActivityModule.InnerModule::class], subcomponents = [MainActivitySubComponent::class])
class MainActivityModule {

    @Provides
    fun bindWaitForInjectClass() = WaitForInjectClass()

    @Module
    abstract class InnerModule {
        @Binds
        @IntoMap
        @ClassKey(MainActivity::class)
        abstract fun bindInjectorFactory(builder: MainActivitySubComponent.Builder): AndroidInjector.Factory<*>
    }
}

class WaitForInjectClass