Android Kotlin Coroutine Scope for Activity, Fragment and ViewModel (Architecture Components)

dependencies {
    def lifecycle_extension_version = '2.2.0-beta01'

    // activity, fragment
    implementation "androidx.lifecycle:lifecycle-runtime-ktx:$lifecycle_extension_version"

    // viewmodel
    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycle_extension_version"

    // optional - livedata
    implementation "androidx.lifecycle:lifecycle-livedata-ktx:$lifecycle_extension_version"
}

class CardFragment : Fragment() { // CoroutineScope by MainScope() {    fun test() {        // launch in main/ui thread        // lifecylerOwner.lifecycleScope.launch {  }        lifecycleScope.launch { // Dispatchers.Main        }        // launch in background thread        lifecycleScope.launch(Dispatchers.Default) {        }    }}

class CardFragment : Fragment() {    init {        lifecycleScope.launchWhenStarted {        }        lifecycleScope.launch {            whenStarted {            }        }    }}

class CardViewModel : ViewModel() {    init {        // new trick to launch when ViewModel created        viewModelScope.launch {        }    }    fun test() {        viewModelScope.launch {        }    }}

val userLiveData: LiveData<User> = liveData {    val data = database.loadUser() // loadUser is a suspend function.    emit(data)}

val userLiveData: LiveData<User> = MutableLiveData()fun loadUser() {    launch {        val data = database.loadUser()        userLiveData.postValue(data)    }}