BitmapFactory.decodeStream 返回值为null的问题

来源：互联网发布：南华大学船山学院知乎编辑：程序博客网时间：2024/05/22 15:32

  public void download(String u) throws Exception {        URL url = new URL(u);        HttpURLConnection conn = (HttpURLConnection) url.openConnection();  conn.setConnectTimeout(5 * 1000);  conn.setRequestMethod("GET");        if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {    InputStream is = conn.getInputStream();            Bitmap bitmap = BitmapFactory.decodeStream(is);        }    }

上面的代码中 BitmapFactory.decodeStream 返回了null，

后来看了一篇帖子说 android 1.6版本会有这样一个bug，虽然我用的不是1.6版本的，但是决定试一下，用高手建议的方法发现问题解决了

我的最终解决办法是：

public void download(String u) throws Exception {URL url = new URL(u);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setConnectTimeout(5 * 1000);conn.setRequestMethod("GET");if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {InputStream is = conn.getInputStream();byte[] data = reads(is);Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);}}public static byte[] reads(InputStream ins) throws Exception {ByteArrayOutputStream outStream = new ByteArrayOutputStream();byte[] b = new byte[1024];int len = 0;while ((len = ins.read(b)) != -1) {outStream.write(b, 0, len);}outStream.close();ins.close();return outStream.toByteArray();}