發現寫好的App預設在轉向(rotate screen) 時會造成 activity 的 reload 事件。解法是：
Add this to your manifest under <activity>:
android:configChanges="keyboardHidden|orientation|screenSize"
解法真是簡單…
相關文章：
How do ı disable reload page on change screen orientation?
http://stackoverflow.com/questions/17241745/android-how-do-%C4%B1-disable-reload-page-on-change-screen-orientation
Don’t reload application when orientation changes
http://stackoverflow.com/questions/5913130/dont-reload-application-when-orientation-changes