RecyclerView OnClickListener using interface

Question

I use RecyclerView adapter to display data inside an activity, I want to implement onClickListener inside the activity, currently, I am setting

Answer 1

Personally, I like to handle this via RxJava subjects:

A Subject is a sort of bridge or proxy that is available in some implementations of ReactiveX that acts both as an observer and as an Observable. Because it is an observer, it can subscribe to one or more Observables, and because it is an Observable, it can pass through the items it observes by re-emitting them, and it can also emit new items.

For more info read Understanding RxJava Subject — Publish, Replay, Behavior and Async Subject.

in Adapter:

public static PublishSubject onClickSubject = PublishSubject.create();

ViewHolder:

public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
    .
    .
    .

    @Override
    public void onClick(View view) {
        onClickSubject.onNext(getItem(getAdapterPosition()));
    }
}

Add your disposables to a CompositeDisposable and dispose them in onDestroy():

private CompositeDisposable compositeDisposable = new CompositeDisposable();

in onCreate():

compositeDisposable.add(MyAdapter.onClickSubject.subscribe(myData -> {
    //do something here
}));

in onDestroy():

compositeDisposable.dispose();

Note:

1. getItem() is a method of androidx.recyclerview.widget.ListAdapter and androidx.paging.PagedListAdapter if you are extending RecyclerView.Adapter you can get item from your data list by position.

2. to use Disposables you need RxJava2 or above