Pedometer应用用于记录你每天走路步数的。尽管记录不一定精准，但是从这个项目中，可以学习几个不同的技术：加速器交互、语音更新、后台运行服 务等。-Pedometer application used to record the number of steps you walk every day. Although the record is not necessarily accurate, but from this proj