Android Question b4a&php - app implementation and problems

Hello.

i'm almost done, my new app and i wanted a "code evaluation" from you so i can improve it even more and help solving problems found

The app has a mysql and php backend of which a part I wrote it myself, the other I used a program to generate it.

the app uses a timer, which continues to advance even in the background
Problems encountered:
1) when the app is open, if I am on another section, when the time expires, it brings me back to the home page but does not update the data in the database. (maybe some passed variables are empty)
2) when the app is close, the timer take more time to finish (it is setted as service)
3) sometimes when I go to another section it closes and reopens section and home

I include:
zip with code
zip with php code + database loaded on the server
I wrote the persons.php file taking inspiration from material found in the forum


Release apk


There is probably some "design" problem.

Please take a look