memory usage of this progress under 15MB for 1GB RAM device
Android内存机制分析下篇:分析APP内存使用情况
http://mobile.51cto.com/aprogram-404264.htm
Android内存小谈
http://www.cnblogs.com/Birdmafly/p/3687790.html
Android service in separate process
http://stackoverflow.com/questions/26896573/android-service-in-separate-process
android如何让service不被杀死
http://app.yanzhilu.com/news/read/3151.html
使用startForeground让android服务前台运行
http://blog.csdn.net/yyingwei/article/details/8509402
<service>
http://developer.android.com/guide/topics/manifest/service-element.html#exported
Service
http://developer.android.com/reference/android/app/Service.html
Android开发实践：检测App的内存占用和泄漏
http://www.linuxidc.com/Linux/2014-03/97563.htm
Managing Your App's Memory
https://developer.android.com/training/articles/memory.html