Viewmodel observing LiveData - how?

android mvvm binding android-lifecycle android-livedata

I fixed this issue using MediatorLiveData. You can follow the steps below.

Create a variable (ex. result).

private final MediatorLiveData<Resource<RequestType>> result = new MediatorLiveData<>();

Call addSource method where the first argument is LiveData and the second is an observer.

LiveData<Resource<EmptyResponse>> observable = service.createItems();result.addSource(observable, response -> {    //Write code here }

Also see this SO answer. The basic requirement is almost the same.

android mvvm binding android-lifecycle android-livedata

You can use Transformations to invoke actions if one of your LiveData Objects changes.

E.g. the user selects a person in a Spinner and you want to load the according person object.

MutableLiveData<Integer> personId = new MutableLiveData<>();LiveData<Person> person = Transformations.switchMap(personId, id -> getPerson(id));

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