SharePreference的坑

apply方法埋下的坑

http://m.blog.chinaunix.net/uid-29506893-id-5761774.html

http://www.cloudchou.com/android/post-988.html

http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/5.1.0_r1/android/app/ActivityThread.java#ActivityThread.handleStopActivity%28android.os.IBinder%2Cboolean%2Cint%29

SharePreference的优化

http://www.cnblogs.com/puff/p/5530825.html