Android代码-dualnback

My first Android application. This code is so rough it makes me cry. Please see: Jaeggi, S. M., Buschkuehl, M., Jonides, J., Perrig, W. J. (2008), Improving fluid intelligence with training on working memory, Proceedings of the National Academy of Sciences, vol. 105 no. 19 http://www.iapsych.com/articles/jaeggi2008.pdf