viewmodel4.kt

class QueryViewModelArc @Inject
constructor(private val searchShows: SearchShows?) : ViewModel() {

    val result = MutableLiveData<String>()

    val query = MutableLiveData<String>()

    val showLoading = MutableLiveData<Boolean>()

    val searchEnabled = MutableLiveData<Boolean>()

    private val queryObserver: Observer<String>

    init {
        showLoading.value = false
        searchEnabled.value = false
        result.value = ""
        query.value = ""
        queryObserver = Observer { query -> searchEnabled.value = !TextUtils.isEmpty(query) }
        query.observeForever(queryObserver)
    }

    override fun onCleared() {
        super.onCleared()
        query.removeObserver(queryObserver)
    }
    //your ViewModel Stuff
}