问题：使用了thread,asyncTask在其中使用了toast等更新ui
解决办法：1.使用handler来发送消息，在主线程中更新ui
2.在报错的方法前加上Looper.prepare(); 末尾加上Looper.loop();
REFERENCES:http://sdlqhjk.iteye.com/blog/1112204
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