java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
1. 程序時，出現運行時異常，如上圖所示。android
2.異常緣由分析。在ContentObserver的onChange方法中，調用了Toast.makeText方法。onChange方法應該在子線程運行，在android中的子線程中不能直接控制UI組件，不然就會報異常oop
3.Looper類別用來爲一個線程開啓一個消息循環。默認狀況下Android中新誕生的線程是沒有開啓消息循環的。（主線程除外，主線程系統會自動爲其建立Looper對象，開啓消息循環）線程
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