我设法编写了一个函数，该函数获取 youtube 视频 html 代码（html 源代码）并返回一个包含所有可用视频链接的数组。然后我选择一个高质量的链接，并显示它而不是可怜的 3gp。
它并不完美，可能会有一些错误和改进：
protected String[] extractLinks(String result) {
//The title of the downloaded file
String title = "bla bla bla";
// An array of strings that will hold the links (in case of error, it will hold 1 string)
String[] temper = new String[1];
try{
// Extract the "url_encoded_fmt_stream_map" attr from the flash object
Pattern p = Pattern.compile("url_encoded_fmt_stream_map(.*?);");
Matcher m = p.matcher(result);
List<String> matches = new ArrayList<String>();
while(m.find()){
matches.add(m.group().replace("url_encoded_fmt_stream_map=", "").replace(";", ""));
}
String[] streamMap = null;
List<String> links = new ArrayList<String>();
if(matches.get(0) != null && matches.get(0) != ""){
// Split the "url_encoded_fmt_stream_map" into an array of strings that hold the link values
streamMap = matches.get(0).split("%2C");
for (int i = 0; i < streamMap.length; i++){
String url = "";
String sig = "";
//Using regex, we will get the video url.
Pattern p2 = Pattern.compile("url%3D(.*?)%26");
Matcher m2 = p2.matcher(streamMap[i]);
List<String> matches2 = new ArrayList<String>();
while(m2.find()){
// We don't need the "url=...&" part.
matches2.add(m2.group().substring(6, m2.group().length() - 3));
}
url = matches2.get(0);
//Using regex again, we will get the video signature.
p2 = Pattern.compile("sig%3D(.*?)%26");
m2 = p2.matcher(streamMap[i]);
matches2 = new ArrayList<String>();
while(m2.find()){
// We don't need the "sig=...&" part.
matches2.add(m2.group().substring(6, m2.group().length() - 3));
}
sig = matches2.get(0);
//Now lets add a link to our list. Link = url + sig + title.
links.add(URLDecoder.decode(URLDecoder.decode(url + "&signature=", "UTF-8") + sig + "%26title%3D" + URLDecoder.decode(title, "UTF-8"), "UTF-8"));
}
}
else{
links.add("No download Links");
}
//Now lets make temper point to a array that holds the list items (aka links).
temper = links.toArray(new String[links.size()]);
}
catch(Exception ex){
temper[0] = ex.getMessage();
}
// That's it! temper has direct download links from youtube!
return temper;
}