为地图添加旋转功能

google论坛

https://groups.google.com/forum/#!msg/mapsforge-dev/gP1L-qfmqYk/XbOYn84UcSYJ;context-place=forum/mapsforge-dev

https://groups.google.com/forum/#!topic/mapsforge-dev/Zqm5IyS1jS4  *重点

http://blog.csdn.net/lmj623565791/article/details/39480503

http://www.tuicool.com/articles/3E7bMr

http://blog.csdn.net/u012975705/article/details/49797911

http://429899791.iteye.com/blog/2212345

http://blog.csdn.net/lzt623459815/article/details/8465575