Kotlin中使用Dagger2可能遇到的坑解决

apply plugin: 'com.android.library'apply plugin: 'kotlin-android'apply plugin: 'kotlin-kapt'...dependencies {... //dagger2  compile rootProject.ext.dependencies["dagger"] kapt rootProject.ext.apt["dagger-compiler"] //dagger2 android 一个dagger2 关于Android的增强库 可选项 compile rootProject.ext.dependencies["dagger-android"] //可选项 compile rootProject.ext.dependencies["dagger-android-support"] //可选项 kapt rootProject.ext.apt["dagger-android-processor"]}

@Singleton@Component(modules = arrayOf(AppModule::class))interface AppComponent { fun inject(app: BaseApplication)}

@Moduleclass AppModule(val app: Application) { @Provides @Singleton fun provideApplication() = app}

class BaseApplication : Application() { override fun onCreate() {  super.onCreate()  initApplication()  DaggerCoreComponent    .builder()    .coreModule(CoreModule(this))    .build(); }}

class MainActivity : AppCompatActivity() ,MainContract.View { @Inject var mPresenter : MainContract.Presenter ? = null override fun onCreate(savedInstanceState: Bundle?) { //******// super.onCreate(savedInstanceState) DaggerMainActivityComponent.builder().build().inject(this) mPresenter?.subscribe() } @Module inner class PresenterModules { @Provides fun providePresenter(): MainContract.Presenter {  return MainPresenter(this@MainActivity) } }}@Component(modules = arrayOf(MainActivity.PresenterModules::class))interface MainActivityComponent { fun inject(activity: MainActivity)}

public final class MainActivity extends AppCompatActivity implements View { @Inject @Nullable private Presenter mPresenter;-----省略}

//于是将上述代码改成 @Inject @JvmField var mPresenter : MainContract.Presenter ? = null//或则@Injectlateinit mPresenter : MainContract.Presenter

 @Inject @JvmField// @Named("preneter")// 错误 正确的做法如下  @field:[Named("preneter")] var mPresenter : MainContract.Presenter ? = null

 @Module inner class PresenterModules { @Provides @Named("preneter") fun providePresenter(): MainContract.Presenter {  return MainPresenter(this@MainActivity) } @Provides @Named("hello") fun provide():String{  return "hello" } }