Reverse Engineering Decode apk and rebuild app

After successful research, I was able to reverse from the apk file to the application can run.

I figured out how to do it.
Take a look at this video, I have tried it successfully in this app.
This is just a partial video shoot, because the important part of the video I did not turn on.

Since I'm an engineer working in Japan, I tried the app in Japanese.

If anyone needs to find out,
or want to cooperate on commercialized business or serve for research.

Please contact me via email
anhlht@nts-sw.co.jp