http://stackoverflow.com/questions/20473355/button-is-not-calling-onclicklistener-with-first-click?lq=1
http://jsonlint.com/
http://jsonviewer.stack.hu/
http://json.parser.online.fr/
http://www.jsoneditoronline.org/
http://www.choujone.com/json
http://guides.codepath.com/android/Home#getting-started
http://guides.codepath.com/android/Sending-and-Managing-Network-Requests
java:
http://www.infoq.com/cn/articles/java-memory-model-1
http://docs.oracle.com/javase/specs/jls/se7/html/jls-17.html
http://www.cs.umd.edu/~pugh/java/memoryModel/jsr-133-faq.html
http://www.ibm.com/developerworks/library/j-jtp02244/index.html
http://gee.cs.oswego.edu/dl/cpj/jmm.html
http://docs.oracle.com/javase/tutorial/essential/concurrency/index.html