如何用Dagger注入DialogFragment？

Question

请问我正在使用 dagger 2 进行 DI，如何将对话框片段注入到我的活动中，以及如何使用 dagger 提供的 DaggerDialogFragment 类

我创建我的 DialogFragmentFactory

 class DialogFragmentFactory @Inject constructor(
private val providers: Map<Class<out Fragment>, @JvmSuppressWildcards 
 Provider<DialogFragment>>
 ) : FragmentFactory() {

override fun instantiate(classLoader: ClassLoader, className: String): 
Fragment {
    // loadFragmentClass is a static method of FragmentFactory
    // and will return the Class of the fragment
    val fragmentClass = loadFragmentClass(classLoader, className)

    // we will then be able to use fragmentClass to get the provider
    // of the Fragment from the providers map
    val provider = providers[fragmentClass]

    if (provider != null) {
        return provider.get()
    }

    // The provider for the fragment could be null
    // if the Fragment class is not binded to the Daggers graph
    // in this case, we will default to the default implementation
    // which will attempt to instantiate the Fragment
    // through the no-arg constructor
    return super.instantiate(classLoader, className)
   }
}

然后我创建我的 DialogFragment 模块

  @Module
 class DialogFragmentsModule {

  @Singleton
  @Provides
  fun myDialogFragment() = MainAlertDialogFragment()

 }

我创建这个注释

          @MustBeDocumented
@Target(
    AnnotationTarget.FUNCTION,
    AnnotationTarget.PROPERTY_GETTER,
    AnnotationTarget.PROPERTY_SETTER
)
@Retention(AnnotationRetention.RUNTIME)
@MapKey
annotation class DialogFragmentKey(val value: KClass<out DialogFragment>)

我注入 AndroidInjectionModule 和 AndroidSupportInjectionModule ， ApplicationComponent ，DialogFragmentsModule

这是我的对话框片段标题

 class MainAlertDialogFragment @Inject constructor() : 
 DaggerDialogFragment(), HasAndroidInjector {

我想像那样注射

      @Inject
lateinit var dialog: MainAlertDialogFragment

Answer 1

您需要将此代码添加到 MainAlertDialogFragment

  @Override
  public void onAttach(Context context) {
    AndroidSupportInjection.inject(this);
    super.onAttach(context);
  }

或者只是从 DaggerDialogFragment 扩展它

...并编辑您的模块。添加这个而不是提供函数

@Singleton
@ContributesAndroidInjector(
    modules = [
           //
    ]
)
fun contributeMainAlertDialogFragment(): MainAlertDialogFragment