In reference to these questions :
Adding gradient effect to TextView in a ListView generates NPE
and
How to change color and font on ListView
<
You just need to create a drawable resource (see an example below), and add it to the layout you created for your ListItem.
The drawable (in your res\drawable folder - name it whatever - listgrad.xml for ex) could look like:
The you would add it to the layout for your list item (the layout.xml file you define for this) like this code snippet:
...