从Android上的url视频下载

Question

在我的Android应用程序中，我必须从网址下载一些视频。为此，我使用此功能：

private void saveVideoToSDcard(String video) throws IOException {
        URL url = new URL(video);
        long startTime = System.currentTimeMillis();
        String name = video.substring(video.lastIndexOf("/") + 1);
        System.out.println("image download beginning: " + name);

        // Open a connection to that URL
        ucon = url.openConnection();

        // this timeout affects how long it takes for the app to realize there's
        // a connection problem
        ucon.setReadTimeout(TIMEOUT_CONNECTION);
        ucon.setConnectTimeout(TIMEOUT_SOCKET);

        // Define InputStreams to read from the URLConnection.
        // uses 3KB download buffer
        InputStream is = ucon.getInputStream();
        BufferedInputStream inStream = new BufferedInputStream(is, 1024 * 5);
        FileOutputStream outStream = new FileOutputStream(
                Environment.getExternalStorageDirectory() + "/Downloads/"
                        + name);
        byte[] buff = new byte[5 * 1024];

        // Read bytes (and store them) until there is nothing more to read(-1)
        int len;
        while ((len = inStream.read(buff)) != -1) {
            outStream.write(buff, 0, len);
        }

        // clean up
        outStream.flush();
        outStream.close();
        inStream.close();

        System.out.println("download completed in "
                + ((System.currentTimeMillis() - startTime) / 1000) + " sec");

    }

我在onCreate（）方法上调用了这个函数：

for (int j = 0; j < jArray.length(); j++) {
            if (target[j].endsWith(".mp4")) {
                System.out.println("video de downloadat");
                String name = target[j]
                        .substring(target[j].lastIndexOf("/") + 1);
                try {

                    saveVideoToSDcard(target[j]);
                    target[j] = Environment.getExternalStorageDirectory()
                            + "/Downloads/" + name;
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }

        }

其中target[]是包含视频网址的数组。

视频已下载到Downloads文件夹，但我遇到此问题：我暂时下载了2个视频：第一个视频的持续时间为1:17，第二个视频的持续时间为2:38。如果我打开第一个视频，它会播放10秒钟，之后会意外关闭。第二个视频没有这个问题，它工作正常。你知道为什么我有这个问题吗？

欢迎任何想法。提前谢谢。