解析错误：解析软件包时出现问题

今天在做自动检测软件更新的时候，将服务器上apk下载下来后，调用Android安装代码进行安装，报了如下错误：

解析错误：解析软件包时出现问题

检查了一下代码，发现出现这个问题的原因是没有关闭输入输出流和关闭网络连接，在下载完后需要依次将这些打开的流关闭，就能解决问题了

bis.close();
bos.close();
connection.disconnect();

/** * 下载apk */public void downLoadApk() {    try {        URL url = new URL("http://hxyiyo.com/ydjx_tV1.0.apk");        HttpURLConnection connection = (HttpURLConnection) url.openConnection();        BufferedInputStream bis = new BufferedInputStream(connection.getInputStream());        File file = new File(Environment.getExternalStorageDirectory() + "/newap.apk");        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file));        int fileLength = connection.getContentLength();        int downloadLength = 0;        int progressLength = 0;        int n = 0;        byte[] buffer = new byte[1024];        while ((n = bis.read(buffer, 0, buffer.length)) != -1) {            bos.write(buffer, 0, n);            downloadLength += n;            progressLength = (int)(((float)downloadLength / fileLength)*100);            Message msg = new Message();            msg.arg1 = progressLength;            hanlder.sendMessage(msg);        }        bis.close();        bos.close();        connection.disconnect();    } catch (MalformedURLException e) {        e.printStackTrace();    } catch (IOException e) {        e.printStackTrace();    }}

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