AsyncTask (異步任務)
似乎Android 3.0以後，呼叫Web Service都會出現android.os.NetworkOnMainThreadException，必需使用asynctask來解決。Android web service access using Async Task
http://codeoncloud.blogspot.tw/2013/07/android-web-service-access-using-async.html (已測試，確定可用)
To find more details about Async Task follow the links below
http://developer.android.com/reference/android/os/AsyncTask.html
http://www.vogella.com/articles/AndroidBackgroundProcessing/article.html
其他參考網址:
http://imax-live.blogspot.tw/2013/03/asynctask.html
http://lionlionchopper.pixnet.net/blog/post/60361723-handler%E5%92%8Casynctask
http://stackoverflow.com/questions/18297485/android-os-networkonmainthreadexception-sending-an-email-from-android/18297516#18297516
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