Android：解析XML时出错，IOException：读取失败：EBADF

Question

当我尝试将InputStream解析为Document时，我收到此错误：

java.io.IOException：读取失败：EBADF（错误的文件编号）

代码：

private String readLanguageXML(InputStream file)
{
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();

    try
    {
        DocumentBuilder builder = factory.newDocumentBuilder();

        Document dom = builder.parse(file); // ERROR HERE
        file.close();

        Element root = dom.getDocumentElement();

        NodeList items = root.getChildNodes();

        for (int j=0; j<items.getLength(); j++)
        {
            try
            {
                Node dato = items.item(j);
                String etiqueta = dato.getAttributes().item(0).getNodeValue();

                languageMap.put(etiqueta, dato.getTextContent());                  
            }
            catch(NullPointerException npe)
            {
                npe.printStackTrace();
            }
        }
    }
    catch (Exception ex)
    {
        ex.printStackTrace();
    }
    return "";
}