Skip to main content
Version: 0.15.1

ViewModels

Once you've added Tangle as a dependency, implementing ViewModel injection is easy.

1. Annotate your ViewModels​

ViewModel injection is done through the @VMInject constructor annotation.

import androidx.lifecycle.ViewModel
import com.example.MyRepository
import tangle.viewmodel.VMInject

class MyViewModel @VMInject constructor(
  val repository: MyRepository
) : ViewModel()

2. Tell Tangle about the AppComponent​

TangleGraph must be initialized as early as possible -- typically in Application.onCreate().

import android.app.Application
import tangle.inject.TangleGraph

class MyApplication : Application() {

  override fun onCreate() {
    super.onCreate()

    val myAppComponent = DaggerAppComponent.factory()
      .create(this)

    TangleGraph.add(myAppComponent)
  }
}

3. Use the tangleViewModel delegate​

import androidx.fragment.app.Fragment
import tangle.viewmodel.tangleViewModel

class MyFragment : Fragment() {
  val viewModel: MyViewModel by tangleViewModel()
}