[Android] 網路連線

http://jacobtsai.wordpress.com/2010/07/15/android-%E5%88%A4%E6%96%B7%E6%89%8B%E6%A9%9F%E6%98%AF%E5%90%A6%E9%80%A3%E4%B8%8A%E7%B6%B2%E8%B7%AF-connectivitymanager/

http://bluegray-javalearning.blogspot.tw/2010/09/nullpointerexception.html

http://fecbob.pixnet.net/blog/post/34682697-%5Bandroid%5D-%E6%AA%A2%E6%9F%A5%E7%B6%B2%E8%B7%AF(wifi)%E5%92%8C3g%E7%8B%80%E6%85%8B

http://milkmidi.blogspot.tw/2012/02/android.html

http://iskens.blogspot.tw/2010/12/android-check-internet-connection.html

http://www.devdiv.com/_Android_%E7%BD%91%E7%BB%9C%E8%B5%84%E6%BA%90%E4%B8%8B%E8%BD%BD%E6%97%B6%E6%96%AD%E7%82%B9%E7%BB%AD%E4%BC%A0%E7%9A%84%E5%AE%9E%E7%8E%B0-weblog-30993-9566.html

http://j796160836.pixnet.net/blog/post/28994669-%5Bandroid%5D-%E4%BD%BF%E7%94%A8http%E7%9A%84post%E6%96%B9%E5%BC%8F%E5%92%8C%E7%B6%B2%E9%A0%81%E8%A1%A8%E5%96%AE%E6%BA%9D%E9%80%9A