android 4.0 HttpURLConnection. getInputStream() 为空的有关问题

public String downTxt(String urlStr) {		StringBuffer sBuffer = new StringBuffer();		String line = null;		BufferedReader bReader = null;		try {			URL url = new URL(urlStr);			HttpURLConnection conn = (HttpURLConnection) url.openConnection();			bReader = new BufferedReader(new InputStreamReader(					conn.getInputStream()));			while ((line = bReader.readLine()) != null) {				sBuffer.append(line);			}		} catch (MalformedURLException e) {			e.printStackTrace();		} catch (IOException e) {			e.printStackTrace();		} finally {			try {				bReader.close();			} catch (IOException e) {				e.printStackTrace();			}		}		return sBuffer.toString();	}

?走到

bReader = new BufferedReader(new InputStreamReader(					conn.getInputStream())); 

?就会报空指针错误。为什么呢 ？

?----------------

?<uses-sdk android:minSdkVersion="14"/> 改为 14以下版本。。。就OK。。。

2 楼 ylzyd12345 2011-12-15  

是不是跟我说的那么样，修改后就好了 ？  当时我搞了一个 上午，才发现的。搜了好多资料都没说出来为什么。

4 楼 xdh725 2012-07-22  

确实坑爹啊  困扰很久