Question

我正在申请从网址上下载sdcard上的视频。我引用这个link。但是此链接包含的URL为.mp4格式。我必须下载新闻提要视频。我的格式不是.mp4格式。它主要是.swf。我的网址是，

http://cdnapi.kaltura.com/index.php/kwidget/wid/_483511/uiconf_id/5590821/entry_id/0_cf39ej0c

我通过解析RSS Feed（新闻Feed）来获取此网址。

我的代码是：

public class MainActivity extends Activity {
    public final String TAG = "MainActivity";
    private final String PATH = "/sdcard/downloadVideo/";
    private final int TIMEOUT_CONNECTION = 5000;// 5sec
    private final int TIMEOUT_SOCKET = 300000;// 30sec
    //public final String imageURL = "http://www.cbsnews.com/video/watch/?id=50149183n&tag=api";
    public final String imageURL = "http://cdnapi.kaltura.com/index.php/kwidget/wid/_483511/uiconf_id/5590821/entry_id/0_cf39ej0c";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        DownloadFromUrl(imageURL, PATH);

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

    public void DownloadFromUrl(String VideoURL, String fileName) { // this is
                                                                    // the
                                                                    // downloader
                                                                    // method
        try {
            URL url = new URL(VideoURL);
            long startTime = System.currentTimeMillis();
            Log.i(TAG, "image download beginning: " + VideoURL);

            // Open a connection to that URL.
            URLConnection 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(fileName);
            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();

            Log.i(TAG, "download completed in "
                    + ((System.currentTimeMillis() - startTime) / 1000)
                    + " sec");

        } catch (IOException e) {
            Log.d("VideoManager", "Error: " + e);
        }

    }
}

但我无法收看此视频？

其实我正在尝试实现视频流。但我不知道怎么做。

我的代码中有错吗？

请提出您的建议以实现上述目标。

提前谢谢!!

Answer 1

首先检查文件是否在您给出的路径中下载..我觉得您的PATH值是错误的。您需要将路径指定为“/ mnt / sdcard / filename” .. Ur路径未指向文件，而是指向文件夹 ..也检查

Answer 2

试试这个：

不要手动定义SD卡的路径，而是使用

String Path = Environment.getExternalStorageDirectory().getPath();

并在其后面添加一个文件名，例如

String filename = Path + "/filename.mp4"

并将这些filename字符串传递给您的FileOutputStream。

修改

使用VideoView直接查看文件，而不是下载文件，代码如下：

VideoView mVideoView; MediaController mcon; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.videoplay); mVideoView = (VideoView) findViewById(R.id.videoview); String videourl="http://cdnapi.kaltura.com/index.php/kwidget/wid/_483511/uiconf_id/5590821/entry_id/0_cf39ej0c"; mcon.setMediaPlayer(mVideoView); // add this line mcon = new MediaController(this); mVideoView.setMediaController(mcon); mVideoView.requestFocus(); mVideoView.setVideoURI(Uri.parse(videourl)); mcon.show(); mVideoView.start(); }

并且不要忘记在androidmanifest.xml中提及互联网许可：

<uses-permission android:name="android.permission.INTERNET" />

从网址下载SDCard上的视频

2 个答案: