Simple CoroutineScope implementation

CoroutineScopeViewModel.kt

import android.app.Application
import android.arch.lifecycle.AndroidViewModel
import android.arch.lifecycle.MutableLiveData
import kotlinx.coroutines.experimental.*
import kotlinx.coroutines.experimental.android.Main
import kotlin.coroutines.experimental.CoroutineContext

abstract class BaseFragmentViewModel(application: Application) : AndroidViewModel(application), CoroutineScope {
    private val job = Job()

    open val modelDispatcher: CoroutineDispatcher = Dispatchers.Default

    override val coroutineContext: CoroutineContext
        get() = modelDispatcher + job

    override fun onCleared() {
        super.onCleared()
        job.cancel()
    }
}

class SuccessScreenModel(application: Application) : BaseFragmentViewModel(application) {
    val delayComplete = MutableLiveData<Unit>()

    override val modelDispatcher: CoroutineDispatcher
        get() = Dispatchers.Main

    fun waitBitMore(delay: Int) {
        launch {
            delay(delay)
            delayComplete.value = Unit
        }
    }
}