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How to handle Item clicks for a recycler view using RxJava

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有刺的猬 2021-02-01 21:49

I was interested to find out what is the best way to respond to a item click of a recycler view.

Normally I would add a onclick() listener to the ViewHolder and pass ba

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  • 广开言路
    广开言路 (楼主)
    2021-02-01 22:40

    My solution was much like @epool 's except use EventBus model.

    First, create a RxBus: RxBus.java

    public class RxBus {
    private final Subject _bus = new SerializedSubject<>(PublishSubject.create());
    public void send(Object o) { _bus.onNext(o); }
    public Observable toObserverable() { return _bus; }
    public boolean hasObservers() { return _bus.hasObservers(); }
}



    Then, you have two way to use RxBus. Create your custom Application class with RxBus reference or create RxBus in Activity/Fragment then pass it to adapter. I'm use the first.
    


    MyApp.java
    


    public class MyApp extends Application {
    private static MyApp _instance;
    private RxBus _bus;
    public static MyApp get() {  return _instance; }

    @Override
    public void onCreate() {
        super.onCreate();
        _instance = this;
        _bus = new RxBus();
    }

    public RxBus bus() { return _bus; }
}

    


    then use 
    


    MyApp.get().bus() 

    


    to get RxBus instance.
    


    The usage of RxBus in Adpater was like this:
    


    public class MyRecyclerAdapter extends ... {
    private RxBus _bus;

    public MykRecyclerAdapter (...) {
        ....
        _bus = MyApp.get().bus();
    }

    public ViewHolder onCreateViewHolder (...) {
        _sub = RxView.longClicks(itemView)  // You can use setOnLongClickListener as the same
              .subscribe(aVoid -> {
                        if (_bus.hasObservers()) { _bus.send(new SomeEvent(...)); }
                    });      
    }
}

    


    You can send any class with _bus.send(), which We will recieve in the Activity:
    


    RxBus bus = MyApp.get().bus();  // get the same RxBus instance
_sub = bus.toObserverable()
            .subscribe(e -> doSomething((SomeEvent) e));

    


    About unsubscribe. 
    


    In MyRecyclerAdapter call _sub.unsubscribe() in clearup() methods and call _sub.unsubscribe() in Activity's onDestory().
    


    @Override
public void onDestroy() {
    super.onDestroy();
    if (_adapter != null) {
        _adapter.cleanup();
    }
    if (_sub != null) {
         _sub.unsubscribe()
    }
}

    
    
    
             
    
                                                        
    
            
            
    
              
                
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