List assets in a subdirectory using AssetManager.list

Question

My application has an assets directory in which I've dumped a bunch of text files I need to load at runtime.

I have a directory full of assets of a particular type (i.e., "assets/subdir") and I want to load all of the files in this directory, one at a time.

I have code like this:

AssetManager assetMgr = getAssets();

String[] assetsIWant = assetMgr.list("subdir");

for(String asset: assetsIWant) {
  doAssetyThing(asset);
}

I've tried a zillion different versions of the parameter to assetMgr.list() and am not getting anywhere.

If I use "/", I get back a list containing the "assets" directory, and a few random other items (META_INF, for example). If I pass any other string (like "assets" or "assets/" or "/assets" or "/assets/" or "mysubdir" or "/mysubdir" or "assets/mysubdir" or ...) then I get back an empty array.

The documentation is unfortunately fairly incoherent.

Does anybody know what the correct formula for that list() parameter is?

Thanks!