android native library logging by logcat

http://www.kunli.info/2011/08/21/android-native-code-study-note/

http://blog.csdn.net/powq2009/article/details/39667105
http://blog.xuite.net/free6d1823/blog/162208532-How+to+use+ALOG

http://stackoverflow.com/questions/19887158/how-take-log-output-from-a-native-library-function-in-android
http://blog.csdn.net/learnerz/article/details/6698669