This app adds two shortcuts in launcher to turn wifi on / off.
I am using this with https://play.google.com/store/apps/details?id=org.gemini.init, and turning wifi on / off when screen is unlock / off. Ex.
https://github.com/Hzj-jie/android-init/blob/master/sample/screen-on.sh
https://github.com/Hzj-jie/android-init/blob/master/sample/screen-off.sh