Encapsulation for ObservableBoolean in ViewModel class

Question

In ViewModel we can apply Encapsulation for MutableLiveData as shown in Android architecture :

private val _dataLoading = MutableLiveData<Boolean>()
    val dataLoading: LiveData<Boolean>
        get() = _dataLoading

As a result dataLoading can not be changed from Fragment or Activity since it is LiveData and not MutableLiveData

How about ObservableBoolean that we may use for DataBinding in ViewModel class for instance :

val isLoading = ObservableBoolean(false)

It can not be private since we use it in DataBinding :

<data>
        <variable
                name="vm"
                type="com.sample.android.ui.DetailViewModel"/>
    </data>

    <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:visibleGone="@{!vm.isLoading}">

So, how we can apply Encapsulation for ObservableBoolean as presented in Google sample?

Answer 1

you could have

private val loading = ObservableBoolean(false)

and in your vm

fun isLoading() = loading

if you want to change the loading state from your fragment/activity you could expose a setter

   fun setLoading(value: Boolean) {
       loading.set(value)
   }