Question

我目前正在学习如何使用Dagger 2注入Android应用程序。我编写了非常基本的代码，但是它无法正常工作。我的目标是按原样注入MainActicity。它建立我的代码：

class MainActivity : AppCompatActivity() {

   @Inject lateinit var info: Info
    override fun onCreate(savedInstanceState: Bundle?) {
        AndroidInjection.inject(this)
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        txt_view.text = info.textInformation
    }
}

class Info {val textInformation = "You are able to read this"    }
@Module
class InfoModule{
    @Provides
    fun info ():Info{
        return Info()
    }
}

class CustomApp : Application (),HasActivityInjector{

    @Inject
    lateinit var dispatchingAndroidInjector: DispatchingAndroidInjector<Activity>

    override fun activityInjector(): AndroidInjector<Activity> {
        return dispatchingAndroidInjector
    }
}

@Component(modules = arrayOf(AndroidInjectionModule::class,
    ActivityModule::class))
interface ApplicationComponent{
    fun inject(application: CustomApp)
}

@Module
abstract class ActivityModule{
    @ContributesAndroidInjector(modules = arrayOf(InfoModule::class))
    abstract fun contributeInfoActivityInjector():MainActivity
}

Answer 1

答案是我忘记将此代码添加到CustomApp类，而将.CustomApp添加到清单文件

override fun onCreate() {
    super.onCreate()
    initDi()
}

private fun initDi() {
    DaggerApplicationComponent.builder().build().inject(this)
}

Dagger2为什么不注入我的Kotlin Android应用程序？

1 个答案: