This is the Android version of the desktop application.
Checkout the app **QField** if you are looking for a touch optimized, simplified interface that can handle QGIS project files that also works with Android 5 and Android 6.
The source code is available under terms of the GPLv2 on github.org/qgis
This is a direct port of the desktop application of QGIS. As such it is only slightly optimized for usage on portable devices and the user interface in many places requires polishing.