How can I get a list of files in StreamingAssets on Android?

I've got a bunch of files in the StreamingAssets directory. I don't need to read the actual files yet, but I need to get a list (or other collection) of what is there. On most platforms, this is working fine:

 jsonFilesPath = Application.streamingAssetsPath;
 var dir = new DirectoryInfo(jsonFilesPath);
 var filesInfo = dir.GetFiles("*.json");
 for (file in filesInfo) {
     //do some stuff
 }

But on Android, it can't find anything. Apparently it's because Android stores the assets in a jar file. I know I can use WWW to read a specific file from it, but how can I simply get a list of them? A list of file names would be sufficient, but including file size, etc. would be ideal.