这个URL是用于XML文件的，里面包含视频信息。这个URL有时效性，并且并不是所有的视频都包含fmp4格式。如果您使用旧的URL或者视频不包含fmp4格式，您将会遇到403错误(您的客户端没有权限获取该URL)。目前我还没有找到解决这个问题的方法。
public static Observable<String> downloadSound(String youtubeUrl, final String baseDir) {
return DownloadManager.downloadFile("http://www.youtube.com/get_video_info?&video_id=" + youtubeUrl, baseDir + File.separator + FILEYOUTUBE, new DownloadManager.IDownloadProgress() {
@Override
public void onProgress(long current, long max) {
}
})
.subscribeOn(Schedulers.newThread())
.observeOn(AndroidSchedulers.mainThread())
.map(new Func1<File, String>() {
@Override
public String call(File youtubeFile) {
String dashmpd = null;
BufferedReader br = null;
try {
br = new BufferedReader(new FileReader(youtubeFile.toString()));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
try {
StringBuilder sb = new StringBuilder();
String line = br.readLine();
while (line != null) {
sb.append(line);
line = br.readLine();
}
String everything = sb.toString();
Log.d("TAG", everything);
dashmpd = getQueryParams(everything);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return dashmpd;
}
});
}
public static String getQueryParams(String url) {
String dashUrl1 = url.substring(url.lastIndexOf("dashmpd"));
String dashUrl2 = dashUrl1.substring(dashUrl1.lastIndexOf("dashmpd"), dashUrl1.indexOf("&"));
String dashUrl = null;
try {
dashUrl = URLDecoder.decode(dashUrl2.substring(dashUrl2.indexOf("http")), "UTF-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return dashUrl;
}