CesiumMobile is a Android mobile app that runs Cesium built on Cordova. This app allows users to load local data and place billboards at their current geographic location with photos taken from their phone's camera. Users can also load the local imagery, Natural Earth II, for a complete offline experience.
Run npm install -g cordova
Run cordova platform add android
Run cordova build
For creating your own Cesium Android app using Cordova check out this blog post.