MVVM sample: reactive data access example

task-view-model.java

public class TasksViewModel
        extends BaseObservable
        implements Observer<List<Task>> {    
    @Inject
    TasksViewModel(...) {
       //...
    }
    
    private LiveResults<Task> liveResults;
    
    public void start() {
        liveResults = tasksRepository.getTasks();
        liveResults.observeForever(this);
    }
    
    public void stop() {
        liveResults.removeObserver(this);
    }
    
    @Override
    public void onChanged(@Nullable List<Task> tasks) {
        if(tasks == null) {
            return; // loading...
        }
        items.clear();
        items.addAll(tasks); // <-- update observable list property
        notifyPropertyChanged(BR.empty);
    }
}