Android MVVM: How to subscribe to a network call by LiveData in ViewModel

Question

In MVVM ViewModel generally subscribes to network call and then inform the UI ie ( Activity or Fragment ) for updating the UI like loading, success or failure. In the case of LiveData inside ViewModel , how would you observe network call changes. For observing LiveData inside ViewModel ideally it should be lifecycle aware, how to achieve this. I am using data binding to update UI so I want to listen to results in ViewModel .

Answer 1

您需要在 ViewModel https://developer.android.com/reference/android/arch/lifecycle/Transformations 中使用Transformations.map或Transformations.switchMap函数