android 获取网络图片方法 常见错误以及解决办法

private Bitmap getUrlimg(String url) throws IOException {Bitmap bitmap = null;URL imageUrl = null;String head = "http://114.80.209.134:13080/";String tureUrl = head + url;imageUrl = new URL(tureUrl);HttpURLConnection conn = (HttpURLConnection) imageUrl.openConnection();conn.connect();InputStream is = conn.getInputStream();BufferedInputStream bis = new BufferedInputStream(is);bitmap = bis.close();is.close();return bitmap;}

以前经常用这种方式获得图片，但是今天发现当图片比较多而且大时，经常 失败，

后来发现 io流的获取没有出错，得到的是完整的io流，但是 还是失败，发现是那个 BitmapFactory.decodeStream(bis);的问题 后来改成这样，见下，可以完全解决问题。

private Bitmap getUrlimg(String url) throws IOException {Bitmap bitmap = null;URL imageUrl = null;String head = "http://114.80.209.134:13080/";String tureUrl = head + url;imageUrl = new URL(tureUrl);HttpURLConnection conn = (HttpURLConnection) imageUrl.openConnection();conn.setRequestMethod("GET");conn.setConnectTimeout(5 * 1000);conn.connect();InputStream is = conn.getInputStream();byte[] bt = getBytes(is);bitmap = BitmapFactory.decodeByteArray(bt, 0, bt.length);is.close();conn.disconnect();return bitmap;}private byte[] getBytes(InputStream is) throws IOException {ByteArrayOutputStream baos =new ByteArrayOutputStream();byte[] b =new byte[1024];int len = 0;while ((len = is.read(b, 0, 1024)) !=-1) {baos.write(b, 0, len);baos.flush();}byte[] bytes = baos.toByteArray();return bytes;}