如何在Android应用中编辑默认布局文件

I've created a ListView in an activity in a java file. For this LIstView I call the android.R.layout.simple_list_item_1 layout view which is a default layout that I did not create myself. I want to create a custom layout in place of simple_list_item_1, but I don't want to have to start from scratch. How can I find this default layout so I can make slight edits to it? The reason I don't want to start from scratch is because all I really want to do is make the text size a bit smaller. If this is possible without editing the file (rather programmatically), then that answer would be fine too. Thanks!I've created a ListView in an activity in a jav