yes，I want to develop a library，Do you have a detailed tutorial（develop library）？What I gather from this code is you are trying to use proguard Obfuscation. You are not required to have eclipse on the computer to use B4A,B4J or B4I.
Unless you are making custom libraries??
thanksDepending on the library, some can be very complicated. Others not so bad.
see this: https://www.b4x.com/android/forum/threads/java-video-tutorial-creating-a-simple-library.12431/