Can’t create handler inside thread that has not called Looper.prepare()
1)在Android 2.3以前，为防止ANR（Application Not Responding），Google是不赞成将网络连接等一系列耗时操作直接放到应用主线程进行的，推荐将这类操作放在子线程内；而Android 4.0版本开始，Google强制要求这类操作必须在子线程内进行，否则将抛出 NetworkOnMainThreadException 异常。
(2)操作UI必须只能在主线程内进行，否则报“Can’t create handler inside thread that has not called Looper.prepare()”错误。
在这里需要注意的是，Toast 也属于UI操作。
具体操作可以参考：http://jerry.hk/notes/android-thread-and-handler
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