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标题:Android实现异步获取并下载图片等网络资源（HttpURLConnection）
正文:
1）从指定的URL获取对应的流既然要获取网络资源，那么首先得有个URL，那么这里我首先封装一个打开URL连接获取到的InputStream 流，这样一来无论是图片资源还是文本文件资源都可以使用该接口方法来获取流。该功能主要应用URLConnection和HttpURLConnection来实现，具体实现方案如下：private InputStream openHttpConnection(String urlString) throws IOException{ InputStream in = null; int response = -1; URL url = new URL(urlString); URLConnection conn = url.openConnection(); if(!(conn instanceof HttpURLConnection)){ throw new IOException("It is not an HTTP connection"); } try { HttpURLConnection httpConn = (HttpURLConnection) conn; httpConn.setAllowUserInteraction(false); httpConn.setInstanceFollowRedirects(true);&nbsp
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