Development of a User Interface for Android App

General information for the business: Developing apps for human activity recognition using smart phones
Kind of development: New program from scratch
Num. of modules: multiple
Description of every module: The interface stores and retrieves multiple data with entries of different users and their live measurements taken from an external medical sensor that is Bluetooth enabled.Furthermore, this data needs to be transferred to a web server for visualization in different chats and tabulation.
Description of requirements/functionality: 1. Support collection of live data from medical sensors via Bluetooth.
2. Save collected data to a file.
3. View and Retrieve data from file.
4. Import data to remote server for visualization in tabular and chart form.
Specific technologies required: Android 4.4.x, Java, JSON.
OS requirements: Windows
Extra notes: For a better idea, below mentioned application could be viewed at

http://simpleeye.com/platforms/android/live-pulse-oximeter/help/#setup