UPIViewModel.java

public class UPIViewModel extends ViewModel {

    public MutableLiveData<String> upiID = new MutableLiveData<>("");
    public SingleLiveEvent<Boolean> isSubmitAction = new SingleLiveEvent<>();
    public SingleLiveEvent<Boolean> canSaveData = new SingleLiveEvent<>();

    public void onSubmit() {
        isSubmitAction.postValue(true);
    }

    public void onCancel() {
        isSubmitAction.postValue(false);
    }
}

SingleLiveEvent is not found, i.e. what gradle dependency need to add SingleLiveEvent ?