I'm trying to preview a
I took a look, and it looks like the answer is that this isn't possible today, because of two bugs.
For some reason, ListView preview doesn't work if the ListView is the root element of the layout, rather than being embedded within the layout. The workaround for this is simple; just surround the ListView with some other layout such as a LinearLayout, setting you ListView's layout_width and layout_height to match_parent.
For some reason, when a layout with a ListView along with a custom view is included into another layout, the custom list item layout isn't working. I know this used to work, so it must have broken at some point, probably when we switched from using comment-style metadata to the tools-namespace metadata to record which layout to use.
I've filed this issue to track the work: