Android : Android: Error handling onClickListener

I have some activity handling the click event on any view

public class MainActivity extends Activity implements OnClickListener{
    ...
}

I have tried to override via this

public void onClick(View v)
{
    switch (v.getId())
    {
        case R.id.button1:
            mp.start();  
            break;
        case R.id.button2:
            mp.pause();  
            break;
        case R.id.button3:
            mp.stop();  
            break;
        default:
            break;
    }
}

But it is asking me to change to handle click event via

@Override
    public void onClick(DialogInterface dialog, int which) {
            // TODO Auto-generated method stub

        }

Has the api's changed , what is the issue I dont have any idea about ?