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	<title>深蓝的blog &#187; 下载文件</title>
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		<title>android开发AsyncTask异步任务实例</title>
		<link>http://www.lanxinbase.com/?p=1049</link>
		<comments>http://www.lanxinbase.com/?p=1049#comments</comments>
		<pubDate>Thu, 26 May 2016 15:21:17 +0000</pubDate>
		<dc:creator><![CDATA[Alan]]></dc:creator>
				<category><![CDATA[7.android应用开发]]></category>
		<category><![CDATA[AsyncTask]]></category>
		<category><![CDATA[HttpURLConnection]]></category>
		<category><![CDATA[下载文件]]></category>

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		<description><![CDATA[今晚无聊，写了个AsyncTask异步下载任务；

继承AsyncTask需要实现几种方法：onPreExecute、doInBackground、onProgressUpdate、onPostExecute

分别是：开始前执行、后台任务执行、进度更新、执行完毕。

以下是MainActivity.java中onCreate()方法中的代码：

Button down = (Button)findViewById(R.id.down);
final ProgressBar pbr = (ProgressBar)findViewById(R.id.progressBar);
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