Migration to Dagger 2.24 Guide (Android)

Chang-Eric released Dagger 2.24

And there are some deprecations/removals:

• dagger.android's Has{Activity,Fragment,Service,ContentProvider,BroadcastReceiver} interfaces are now removed in favor of HasAndroidInjector (which can handle any type). HasAndroidInjector was added in 2.23, and is supported together with the old types in that version.

In this story, I want to show how to replace it

Replace

AppComponent

If you are using AndroidSupportInjectionModule, replace it with AndroidInjectionModule. You no longer need to use AndroidSupportInjectionModule

@Singleton
@Component(modules = [AndroidInjectionModule::class, AppModule::class, ActivityBuilder::class])
interface AppComponent : AndroidInjector<YourApplication> {
override fun inject(instance: YourApplication)
@Component.Builder
  interface Builder {
@BindsInstance
    fun application(application: Application): Builder
    fun build(): AppComponent
  }
}

Application

Replace Has{Activity,Fragment..}, etc. implemented in Application with HasAndroidInjector

class YourApplication: Application(), HasAndroidInjector {
 @Inject
 lateinit var androidInjector: DispatchingAndroidInjector<Any>
 override fun androidInjector(): AndroidInjector<Any> {
     return androidInjector
 }
 override fun onCreate() {
     super.onCreate()
     DaggerAppComponent.builder()
       .application(this)
       .build()
       .inject(this)
 }
}

Until now there was a DispatchingAndroidInjector for each class for Activity, Fragment, Service, etc., but it is now a single DispatchingAndroidInjector<Any>

Activity, Fragment

Replace Injectors such as HasFragmentAndroidInjector with HasAndroidInjector .

class YourActivity : AppCompatActivity(), HasAndroidInjector {
 @Inject
 lateinit var androidInjector: DispatchingAndroidInjector<Any>
 override fun androidInjector(): AndroidInjector<Any> {
     return androidInjector
 }
 // ...
}
public class YourFragment extends Fragment {
  @Inject SomeDependency someDep;
  @Override
  public void onAttach(Activity activity) {
    AndroidSupportInjection.inject(this);
    super.onAttach(activity);
   
    // ...
  }
}

That’s all :)
If you are an Android Developer, you can check it out my other story:

How to handle Bottom Navigation perfectly with back pressed?

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Thanks and happy coding!