AsyncTask异步方式详解及其使用
查看官方的解释：
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AsyncTask enables proper and easy use of the UI thread. This class allows to perform background operations and publish results on the UI thread without having to manipulate threads and/or handlers.
An asynchronous task is defined by a computation that runs on a background thread and whose result is published on the UI thread. An asynchronous task is defined by 3 generic types, called?Params,?Progressand?Result, and 4 steps, called?begin,?doInBackground,?processProgress?and?end.
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Usage:
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AsyncTask 是abstract class必须被子类继承使用。至少要重写一个方法：(doInBackground(Params...)), 经常还要重写另一个方法：(onPostExecute(Result).)
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demo：
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创建后，使用起来，非常简单：
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?new DownloadFilesTask().execute(url1, url2, url3);??
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在网上搜了一下，这篇文章讲解的不错。
http://blog.csdn.net/zuolongsnail/article/details/6394055
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