You can use WWW inside a jar/apk/zip:
WWW is now (partly) backed by JarURLConnection, which means you can access files inside the apk, if you want.
(as jars are zip files, and apks are zipfiles you can use jar:file// to read inside the apk with something like
WWW("jar:file//" + Application.dataPath + "!/some/file/inside/the/apk.file"); )