Thanks alot for all your help. My program now works.
Since Im a Computer Science Major they dont usualy teach GUI
programming so setting up a listener is somewhat forgen to me.
On Jan 18, 10:17 am, Mark Murphy <mmur...@commonsware.com> wrote:
> Eddie O'Hagan wrote:
> > I think I found what u were talking about.
>
> > myCalcButton.setOnClickListener(new Button.OnClickListener()
> > {
> > public void onClick(View v)
> > {
> > double billNum =
> > Double.parseDouble(myBillAmt.getText
> > ().toString());
> > double preNum = Double.parseDouble
> > (myPrecentage.getText().toString());
>
> > myAns.setText(""+calcTip(billNum,preNum));
> > }
> > }
> > );
>
> > I dont relly understand what is going on here though. Could you please
> > explain this to me?
>
> This is pretty typical for widget-based GUI development, at least on
> Java. You are passing the Button an OnClickListener object. The Button
> will call onClick() on that OnClickListener when the Button is clicked.
> In there, you are doing your tip calculation and updating the TextView
> with the results.
>
> If your concerns lie with the "new Button.OnClickListener()" syntax, you
> will want to read up on "anonymous inner classes".
>
> --
> Mark Murphy (a Commons Guy)http://commonsware.com
> _The Busy Coder's Guide to Android Development_ Version 2.0 Published!
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