You can look here https://www.b4x.com/android/forum/pages/results/?query=library+create&page=1&prefix=0
or here https://www.b4x.com/android/forum/threads/java-video-tutorial-creating-a-simple-library.12431/
You can ask questions here https://www.b4x.com/android/forum/forums/libraries-developers-questions.32/
or here https://www.b4x.com/android/forum/threads/java-video-tutorial-creating-a-simple-library.12431/
You can ask questions here https://www.b4x.com/android/forum/forums/libraries-developers-questions.32/