To build dev version you have to do::
1- change bundle name in all app
from "com.app.certificate360" to "com.app.certificate360dev"
2- change app icon from pubSpec.yaml to production icon call 'launcher_debug_icon' then run this command flutter pub run flutter_launcher_icons:main
3- change development to true from general_constants
4- run this command to build apk dev version flutter build apk --release
To build production version you have to do::
1- change bundle name in all app
from "com.app.certificate360dev" to "com.app.certificate360"
2- change app icon from pubSpec.yaml to production icon call 'launcher_icon' then run this command flutter pub run flutter_launcher_icons:main
3- change development to false from general_constants
4- run this command to build apk production version flutter build apk --release
or run this to build aap flutter build appbundle