1

当我从获取 jpeg 文件 url 的 openhttpconnection 获取输入流时，我总是得到 null 的位图返回。例如，我的 url 字符串是

 http://10.0.2.2:8000/mydirectory/myfile.jpg

其中 8000 是使用模拟器运行的本地服务器的端口。我可以使用这种相同类型的 url 从 web 服务获取，但不能用于获取图像文件。要将 jpgeg 文件制作成位图，我需要做些什么不同的事情，还是我的 url 格式有问题？下面是我的代码。任何帮助表示赞赏。

  private Bitmap downloadImage(String url) {

        Bitmap bmap = null;
        InputStream inStream = null;

        try {
            inStream = openHttpConnection(url);
            Log.d("inStream", String.valueOf(inStream));
            bmap = BitmapFactory.decodeStream(inStream);
            if(inStream != null)
                inStream.close();

        }
        catch (IOException el) {
            el.printStackTrace();
        }
        return bmap;
    }

    private InputStream openHttpConnection(String urlString) throws IOException {

        InputStream inStream = null;
        int checkConn = -1;
        URL url = new URL(urlString);
        URLConnection conn = url.openConnection();
        try {

            HttpURLConnection httpConn = (HttpURLConnection) conn;
            httpConn.setAllowUserInteraction(false);
            httpConn.setInstanceFollowRedirects(true);
            httpConn.setRequestMethod("GET");
            httpConn.connect();
            checkConn = httpConn.getResponseCode();
            if (checkConn == HttpURLConnection.HTTP_OK) {
                inStream = httpConn.getInputStream();

            }

        }
        catch (Exception ex) {
            throw new IOException("Error connecting");
        }
        return inStream;
    }
4

0 回答 0