Android rxjava / rxbinding – check if the subscription exists

I am using rxbinding and creating a subscription in the recyclerview adapter of the onbindviewholder method. The subscription is a reusable item. Is there a simple way to check whether the subscriber has been assigned to the EditText object and delete the subscriber if it has been deleted?

My code looks like this

public void onBindViewHolder(final ItemViewHolder holder, int position) {

    holder.text.setText(mProvider.get(position).text);
    Subscription textSub = RxTextView.textChanges(holder.text).subscribe(new Action1<CharSequence>() {
        @Override
        public void call(CharSequence charSequence) {
            ...
        }
    });
    subscriptions.add(textSub);
}

resolvent:

You can keep it as a class member. For example

Subscription textSub = Subscriptions.unsubscribed(); 

next

public void onBindViewHolder(final ItemViewHolder holder, final int position) {

     holder.text.setText(mProvider.get(position).text);
     textSub.unsubscribe();
     textSub = RxTextView.textChanges(holder.text).subscribe(new Action1<CharSequence>() {
          @Override
          public void call(CharSequence charSequence) {
               ...
          }
      });
}