onClick function

declaring a single onClick function for all instead of using all innerClass stuff

first we need to implements View.OnClickListener

then in the onClick funtion which recives View as parameter
we need to setup swich Case to know which element has been clicked
so in the the switch case we need to write

switch(view.getId())
{
case R.id.b1: .......;break;
case R.id.b2: .......;break;
}