To date, there is only one 3D Scanning App for Android. It is Objectify.
“Objectify uses the front-facing camera and the smartphone display to create light reflections to calculate a 3D model from the picture. With this app you can capture 3D models of yourself, friends or family members and share the results afterwards.”
To be honest, there is still a long way to go for this to work correctly. Yet, you can help the developer by downloading the app here.
Note: 3D scanners and 3D cameras are different. A 3D scanner creates 3D models and a 3D camera generates 3D pictures.