viewmodel4.java

public class QueryViewModelArc extends ViewModel {

    private MutableLiveData<String> query = new MutableLiveData<>();

    private MutableLiveData<Boolean> searchEnabled =  new MutableLiveData<>();

    private Observer<String> queryObserver;

    private SearchShows searchShows;

    @Inject
    public QueryViewModelArc(SearchShows searchShows) {
        this.searchShows = searchShows;
        searchEnabled.setValue(false);
        query.setValue("");
        queryObserver = query -> searchEnabled.setValue(!TextUtils.isEmpty(query));
        query.observeForever(queryObserver);
    }

    @Override
    protected void onCleared() {
        super.onCleared();
        query.removeObserver(queryObserver);
    }

    public MutableLiveData<Boolean> getSearchEnabled() {
        return searchEnabled;
    }

    public MutableLiveData<String> getQuery() {
        return query;
    }
  //other ViewModel Stuff
}