Dynamic parameter injection

I’m using the koin-android-architecture version of the library. I’ve come across a situation where I’d like to use a parameter determined when an Activity/Fragment is created for a ViewModel. As an example:

SomeActivity.kt

class SomeActivity : BaseActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        val id = getIdExtra() // From intent
        TODO("use id")
        val viewModel = getViewModel<SomeViewModel>()
        // ...
    }
}

SomeViewModel.kt

class SomeViewModel(
    private val repository: Repository, // Singleton
    private val id: Long
) : BaseViewModel() {
// ...
}

Is there a good way of doing this? I know that Kodein has factory bindings, so I was wondering if there was something similar.

This issue is similar to #6 but I was wondering if there was a better method of achieving this now since that issue is relatively old.

[iRYO400]

Hi there! How is it going in 2.0?

[arnaudgiuliani]

I 've add Koin parameters to release 0.9.0.

you will be able to use parameters in your definition. Given class:

class MyPresenter(val activity : MyActivity)

We can use parameters to be injected with by inject()

val module = applicationContext {
   factory { params -> MyPresenter(params["activity"])}
}

Injecting the parameter:

class MyActivity : AppCompatActivity(){
   
   // Ask for MyPresenter injection and provide parameters
   val presenter : MyPresenter by inject( parameters = mapOf("activity" to this))
}

stay tuned👍