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On this page: Is given on this page: http://developer.android.com/resources/tutorials/views/hello-listview.html. , the below tip is given.
Tip: You can use list item designs
provided by the platform instead of
defining your own layout file for the
ListAdapter. For example, try using
android.R.layout.simple_list_item_1
instead of R.layout.list_item.
However, is it safe to use “simple_list_item_1”? Is it guaranteed that all platforms will provide a list item with this id?
Edit – yes, apparently these are bundled with Android and they should be supported on all platforms.
In any case, I believe what happens is that they are copied from the SDK into your project when you reference them.As Felix pointed out, they are included on the device itself and they are considered to be part of the API.
You can see layouts available within the SDK on the Android gitweb. For example, simple_list_item_1.xml.