upgrade and make some changes on the Mobile App

We already have a Mobile App built for managing below needs
1. Authenticate the Employee with the username and password.
2. App have function “Check-In” and “Check-Out” function to mark the attendance in the system. Its using the API Endpoint to call the service. While the check in and check out is triggered, its capturing the time, Geo Location and Photo from the front camara data .
3. A calendar can be shown depending upon the start-date and end-date selected by the user in the mobile app, and call the API to get the Attendance details back to the mobile app in a calendar view as present ,working hours , check in and check out time etc … .Which is showing the list of reports
4. A calendar can be shown depending upon the start-date and end-date selected by the user in the mobile app, and call the API to get the Attendance details back to the mobile app in a list view (like excel) with Date , Check-In time, Check-out time , Attendance status ,total hours( will be calculated by checkout – check in time ) , Overtime , Attendance approval status , Overtime cost .
5. An option required to click on the mobile to retrieve the holiday details in the mobile , and required api will be shared .


We have currently have the Android dev Env on 6.2 . we need upgrade the same and two additional filters to be added .The Release need to be there for Android and IOS .