Recently, I graduated from my university. Below, you can browse my Master Thesis presentation about Brain-Computer Interface for mobile devices. If you are interested in writing mobile Android applications communicating with NeuroSky MindWave Mobile device, you can check my EEG Reader project on GitHub, which can be treated as a basis for more advanced projects. During writing my Master Thesis, I created two another projects using similar concepts. Mentioned code may be a little bit outdated comparing to the newest Android trends, but feel free to fork and upgrade it.
Update: You can read a publication based on my Master Thesis in the Journal Of Medical Informatics & Technologies Vol. 24/2015, ISSN 1642-6037:
Brain-Computer Interface for Mobile Devices