Just fixed that, please see https://github.com/plutext/Docx4j4Andro ... 28c9ebb0a7
It now runs ok in emulator (API 26), build on Android Studio 2.3.3.
Please note currently known issue running on API 21: https://github.com/plutext/Docx4j4Android4/issues/3
Not sure whether that's specific to API 21 or not, so please respond to that issue with any additional data. Thanks!