Thank you Manfred
I am quite embarrassed. You are right. This is the 1st time I write program during the past 32 years. When I was young, I learn Fortran Cobol and Basic only. Now I am 63 years old. I never use C language. This is a real challenge to me. I start this project since 6/15. I try to learn Android Studio. I feel no confidence, until I touch B4A. B4A is so great that I use only 45 days and I have almost finished the 1st version. This project is used for my own company. Many of my friends are very surprised that I can write an APP all by myself. And so quick. This project is very important for our nail(for girl's finger) business. We hope to have a trial promotion at the middle of September when all students are going back to school. I run an artificial nail business(I am manufacturer). I am very busy. So I use very little time to read document. Usually I use them like dictionary. By the end of this year, if our marketing can get good response, I will post my experience to youtube and persuade our engineers in Taiwan to use B4A as their primary tool to develop.
Thank you Manfred, you always give me the most quick advice. Thank you.
Andy