Fix Some Bugs and add new funtionnalities

I have a very simple Android App developed by a new Android Developer that started bu didnt finish. The App has some bugs that need to fix, and i need develop new things. The App is for people who work in the street(field), send their positioning and permit they receive a service information about what threy have to do. The App already work with: - Login(calling a rest api) - Send Gps Positioning(calling a rest api) - Show on map the device positioning. - Monitore a new service arriving(calling every one mminute a rest api). I need to develop: - Fix some existents bug or do better what the app already have developed. - Call a new rest api that return the possible status and permit the user select on option(and send this option by a service api). - Implement classe to receive a new service by push and change the funtionnality that exists to call a service every one minute - Permit the user accept o reject a new service - Create a new screen that show service information - Do better the app navigability - Show the user history service(call api that return all services) - two screen 1 list with main information 2 - detailed service infomration. - In the services accepted we ave two steps Step 1 - The user arrive in the service location - need to call a rest apii informing the arrivived status and send a information that user will insert(XXX-2222). Step 2 - Just inform the service finised caling a rest api with statusId finished.