This is simple 1 page app
But it should be include bellow functions
[login to view URL] exchange with web app (web app js <-> Android app)
[login to view URL] in the background, display a notification on the Android screen when a message is received from the web application (even in sleep mode)
3.Re-launch the app as soon as possible when the app is closed.
[login to view URL] AndroidOS as soon as possible when AndroidOS starts (app is in the background)
[login to view URL] the specified area is exceeded, the app cannot be used (hide web view, do not show notification)
[login to view URL] current location to web app (send to web app with S1 function ID, about once per minute)
Please check attached file also.