Dialog中使用handler时报：Can't create handler inside thread that has not called Looper.prepare()
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Dialog中使用handler时报：Can't create handler inside thread that has not called Looper.prepare()
dialog的show方法前后加，Looper.prepare();和Looper.loop();即可
但这样会扰乱 Looper的运行机制，在主线程中就不行在使用handler了
建议用其他方式代替Dialog中的handler。
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