测心跳原理 https://www.zhihu.com/question/20410686
数据库 https://github.com/litesuits/android-lite-orm
gradle 配置 http://blog.csdn.net/fuchaosz/article/details/51567808
记步源码 https://github.com/linglongxin24/DylanStepCount/blob/master/README.md 记步原理 https://www.jianshu.com/p/5d57f7fd84fa https://github.com/finnfu/stepcount/tree/master/demo