It is the launcher activity. In this activity the splash and the information are downloaded and processed. It also starts the GPS listener. After everything is ready the splash is removed and the TabBar Activity appears.
It holds the tab bar and manages the child screens (ARView, Map, List and options)
It loads the data to an ListView with its images as icons, clicking on any cell will show the image in full screen.
It shows the data on the map view with its images as icons, clicking on any poi will show the image in full screen.
It shows the data on the AR Browser view with its images as icons.