How to get listener of a view

Question

I write service that interacts with other apps. It registers listeners on views (buttons, textviews,...), that already have listeners. I need to replace them with my own lis

Answer 1

create classes that implements OnClickListener

public static class MyClickListener1 implements OnClickListener{
    Activity mActivity;
    MyClickListener1(Acivity activity){
      mActivity=activity;
    }
    @Override
    public void onClick(View v) {
            //do something
    }
}

public static class MyClickListener2 implements OnClickListener{
    @Override
    public void onClick(View v) {
            //do something
    }
}

and in your code you can easily use them:

btn.setOnClickListener(new MyClickListener1(this));
btn.setOnClickListener(new MyClickListener2());

or you can create instances and reuse them:

OnClickListener listener1 = new MyClickListener1(this);
OnClickListener listener2 = new MyClickListener2();
btn.setOnClickListener(listener1);
btn.setOnClickListener(listener2);

you can also define a constructor to pass whatever you need in these classes. I usually pass the activity like in MyClickListener1

EDIT: If you want to have the listener like object in the button, you can use the tag.

btn.setTag(listener1);
btn.setOnClickListener(listener1);

and then to get it use

OnClickListener old_listener = (OnClickListenr)btn.getTag();