Take a look at List14.java in the API Demos sample code.
It does something similar to what you are wanting to do.

On Mar 18, 10:49 am, xinit <[email protected]> wrote:
> Hello
>
> I have a simple ListActivity midlet. It populates the list using a
> String array which is passed to the setListAdapter method.
>
> i.e.:
>
> String[] directoryListing = {"\etc","\dev", "writetext.txt"};
>
> setListAdapter(new ArrayAdapter<String>(this,
>                                 R.layout.main, R.id.selection,
>                                 directoryListing));
>
> However my question is, how is it possible to modify the properties of
> the list so if I know "\etc" and "\dev" are directories and I want to
> change the text colour to reflect that it is a directory how can I do
> this ?
>
> Can anyone point me to any API's ?
>
> Thanks
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