1.
http://blog.csdn.net/sjz_iron/article/details/8726661
http://www.16rd.com/home.php?mod=space&uid=6514&do=blog&id=82
https://android.googlesource.com/platform/frameworks/base.git/+/master/core/java/com/android/internal/os/PowerProfile.java
原文：http://www.cnblogs.com/zhangze/p/3528620.html