I have android application - [login to view URL]
it's reward type system. User getting reward for small tasks. Tasks is from PHP with API. Some example is here - [login to view URL]
You need create app usage statistics. Create permission asking and give reward if user have used application one hour.
All apps details (package name, time, points) is going throw php API.
Please add saparas job to description.
We can buy this code - [login to view URL]
you can create simillar like this into my working application.
Please write correct budget. You must know JAVA and PHP.