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用正牌的解決方案Handler
- 參考：
- developer.android.com/training/multiple-threads/communicate-ui.html
http://j796160836.pixnet.net/blog/post/28766165-%5Bandroid%5D-%E5%A4%9A%E5%9F%B7%E8%A1%8C%E7%B7%92-handler%E5%92%8Cthread%E7%9A%84%E9%97%9C%E4%BF%82