AndroidInjection / AndroidSupportInjection to inject custom class

Is it possible to do that with the android utilities ? I have an: Application / Activity / Fragment component structure where my activity components are subcomponents of the application component, and the fragments components are subcomponents for the activities ones. Everything is working alright using:

AndroidInjection.inject(this) for activities and AndroidSupportInjection.inject(this) for fragments inside onCreate and onAttach respectively:

// for the activity
override fun onCreate(savedInstanceState: Bundle?) {
    AndroidInjection.inject(this)
    super.onCreate(savedInstanceState)
}

// for fragments
override fun onAttach(context: Context?) {
    AndroidSupportInjection.inject(this)
    super.onAttach(context)
}

Injection works perfectly, but now I need to inject a different class using the fragment component. Is there any possible way to have access to the fragment / activity component from inside the activity / fragment and perform an injection over a different class? Let’s say it’s a customview with some injected dependencies, and I don’t want to create a different component for it (since that would be messy and I don’t really need to create a different scope for it, I should probably reuse the fragment / activity scope to inject it):

fragmentComponent.inject(myCustomView)

I would love to be able to do that in some way, but I see that AndroidInjection and AndroidSupportInjection are hiding too many details here and I the only possible choice for me to get this working would be to rollback the injection strategy to the “old style” explicit subcomponent builders inside the activity and the fragment.

[ronshapiro]

If it’s a class that Android constructs, you can inject the component into the fragment, and the fragment can call the injection:

@Subcomponent
interface FragSubcomponent extends AndroidInjector<Frag> {
  void inject(MyCustomView view);
  /* component builder */
}

class Frag extends DaggerFragment {
  @Inject FragSubcomponent component;

  void onCreateView() {
    component.inject(findViewById(R.id.customView));
  }
}

If the object is something that you can call new on, can you inject the type yourself?

[tbroyer]

Or you could inject a MembersInjector<MyCustomView> rather than the full component.