Attaching multiple listeners to views in android?

Question

Is it possible to attach multiple onClick listeners to buttons in android? Example:

btn1.setOnClickListener(listener1);
btn1.setOnCliclListener(listener2);

And when the button is clicked onClick event of both listener1 and listener2 are triggered?

In normal GUI applications I know that we can attach more than one event handler for an event. Is it possible for android too or is there any restrictions?

Regards, Lalith

Answer 1

Android only supports one registered listener in general. However, you can easily create a listener that simply forwards the events to other listeners using the composite pattern.

Answer 2

public void onClick(View v) {
    if(v.getId() == R.id.button1) {
        // do this
    }else if(v.getId() == R.id.button2) {
        // do that
    }
}

Answer 3

Nope, for example just do this :

Set Listener:

btn.setOnClickListener(this);

Implement Method:

public void Onclick(View arg0){

   // check your id and do what you want
}