Check initial demo source code at: This is an open source, free, demo application for network traffic monitoring and data usage statistics for Android based devices The real heavy work of the App is accomplished via native JNI/C+/STL Containers, with minimum Java usage for UI.
Firas achkar is the developer of this application that can be found in the Tools category. The developer rolled out a new version of NetTrafficStats on Mar 8, 2015 and over 0,5K users downloaded and set up the app. This application has the overall rating 3 on Google Play.
Get the installation package of NetTrafficStats 1.2.1 for free and take a look at users' reviews on Droid Informer. The app works flawlessly on Android 4.2 and higher. It's secure to download the app.