在Java，Android上从Youtube下载视频的代码

3个步骤：

1. 检查YouTube的源代码（HTML），您将获得这样的链接（http％253A％252F％252Fo-o.preferred.telemar-cnf1.v18.lscache6.c.youtube.com％252Fvideoplayback …） ;

2. 解码url（删除％2B，％25等代码），创建带有以下代码的解码器：http : //www.w3schools.com/tags/ref_urlenpre.asp并使用函数 Uri.depre（url） 替换无效的代码转义的八位位组；

3. 使用代码下载流：

        URL u = null;    InputStream is = null;      try {        u = new URL(url);        is = u.openStream();         HttpURLConnection huc = (HttpURLConnection)u.openConnection(); //to know the size of video        int size = huc.getContentLength();   if(huc != null) { String fileName = "FILE.mp4"; String storagePath = Environment.getExternalStorageDirectory().toString(); File f = new File(storagePath,fileName); FileOutputStream fos = new FileOutputStream(f); byte[] buffer = new byte[1024]; int len1 = 0; if(is != null) {     while ((len1 = is.read(buffer)) > 0) {         fos.write(buffer,0, len1);       } } if(fos != null) {     fos.close(); }        }     } catch (MalformedURLException mue) {        mue.printStackTrace();    } catch (IOException ioe) {        ioe.printStackTrace();    } finally {        try {     if(is != null) {     is.close(); }        } catch (IOException ioe) { // just going to ignore this one        }    }

仅此而已，您将在网上找到大部分内容！！！