java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
1. 程序时，出现运行时异常，如上图所示。android
2.异常缘由分析。在ContentObserver的onChange方法中，调用了Toast.makeText方法。onChange方法应该在子线程运行，在android中的子线程中不能直接控制UI组件，不然就会报异常oop
3.Looper类别用来为一个线程开启一个消息循环。默认状况下Android中新诞生的线程是没有开启消息循环的。（主线程除外，主线程系统会自动为其建立Looper对象，开启消息循环）线程
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