Youtubeの動画はxml形式で動画の情報を取得する事が出来る。この情報を利用して、Youtubeの動画URLからタイトル、再生時間、サムネイルのBitmapを取得するサンプルコードを紹介する。

動画のタイトル及び再生時間を文字列で返すコード。

public String Youtube_Fetchinfo(Context context,String url,int timeout){
   	String infourl="";
   	if (!url.toLowerCase().contains("youtube"))
   		return null;

	//get video ID
	Pattern p = Pattern.compile(".+v=([^&\"]*)");
	Matcher m = p.matcher(url);
	if (m.find()) {
		infourl = "http://gdata.youtube.com/feeds/api/videos/"+m.group(1);
	}else{
		return null;
	}

   	int responseCode = 0;
	int duration=0;
	String sduration="";
	String title="";
	String movietitle = new String();

	try {
		//Get video information
		String defaultUA = "Mozilla/5.0 (Linux; U; Android 2.1; en-us) AppleWebKit/522+ (KHTML, like Gecko) Safari/419.3";
		HttpClient httpClient = new DefaultHttpClient();
		HttpGet httpGet = new HttpGet(infourl);
		HttpResponse httpResponse = null;

		httpClient.getParams().setParameter("http.connection.timeout", new Integer(timeout));
		HttpParams params1 = httpClient.getParams();
		HttpConnectionParams.setConnectionTimeout(params1, timeout);
		HttpConnectionParams.setSoTimeout(params1, timeout);
		params1.setParameter(HttpProtocolParams.USER_AGENT, defaultUA);
		httpResponse = httpClient.execute(httpGet);
		responseCode = httpResponse.getStatusLine().getStatusCode();

		if (responseCode == HttpStatus.SC_OK) {
			InputStream istream = httpResponse.getEntity().getContent();
			InputStreamReader reader = new InputStreamReader(istream);
			BufferedReader objBuf = new BufferedReader(reader);
			StringBuilder builder = new StringBuilder();
			String sLine;

			while((sLine = objBuf.readLine()) != null){
				builder.append(sLine);}
			String html = builder.toString();
			istream.close();

			//find duration info
			Pattern dp = Pattern.compile("seconds='(\\d+?)'");
			Matcher dm = dp.matcher(html);
			if (dm.find()) {
				try {
						duration = Integer.parseInt(dm.group(1));
				}catch(Exception e){duration=0;}
			}

			//find video title
			Pattern tp = Pattern.compile(&quot;<title.*?>(.*?)</&quot;);
			Matcher tm = tp.matcher(html);
			if (tm.find()) {
				title = tm.group(1);
				if (title.length()>0){
					if (duration > 60)
						movietitle = title+&quot; (&quot;+(duration/60)+&quot;min)&quot;;
					else
						movietitle = title+&quot; (&quot;+duration+&quot;sec)&quot;;
					movietitle = movietitle.replace(&quot;&amp;&quot;,&quot;&&quot;);
					movietitle = movietitle.replace(&quot;&gt;&quot;,&quot;<&quot;);
					movietitle = movietitle.replace(&quot;&lt;&quot;,&quot;>&quot;);
					movietitle = movietitle.replace(&quot;&quot;&quot;,&quot;\&quot;&quot;);
					return movietitle;
				}
			}
		}
		else if (responseCode == 403){ //forbidden
			movietitle = &quot;forbidden&quot;;
			return movietitle;
		}
	} catch (ClientProtocolException e) {
	} catch (IOException e) {
	return null;
}

サムネイル画像の取得コード。

public Bitmap VGinfo_Fetchthum(Context context,String url){
	String vid="";
	String turl="";

	if (!url.toLowerCase().contains("youtube"))
		return null;

	Pattern p = Pattern.compile(".+v=([^&\"]*)");
	Matcher m = p.matcher(url);
	if (m.find()) {
		vid = m.group(1);
	}else
		return null;
	if (vid.length()<2)
    	return null;

	try {
		URL imageUrl;
		imageUrl = new URL(&quot;http://i.ytimg.com/vi/&quot;+vid+&quot;/1.jpg&quot;);

		InputStream imageIs;
		imageIs = imageUrl.openStream();

		//saving image to SD card (to be used for caching), change location or return data directly as needed
		File saveDir;
		String filepath;
		saveDir = new File(Environment.getExternalStorageDirectory().getAbsoluteFile()+&quot;/simpleweb/videothum/&quot;);
		filepath = Environment.getExternalStorageDirectory().getAbsoluteFile()+&quot;/simpleweb/videothum/&quot;+vid+&quot;.jpg&quot;;
		if(!saveDir.exists()) {
			if (!saveDir.mkdirs()) { //can't save to file, load to memory
				Bitmap image = BitmapFactory.decodeStream(imageIs);
				return image;
			}
		}

		File file = new File(filepath);
		BufferedInputStream bufferedInputStream = new BufferedInputStream(imageIs, 10240);
		BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(file, false), 10240);

		byte buffer[] = new byte[10240];
		int size = 0;
		while(-1 != (size = bufferedInputStream.read(buffer))) {
			bufferedOutputStream.write(buffer, 0, size);
		}
		bufferedOutputStream.flush();
		bufferedOutputStream.close();
		bufferedInputStream.close();

		Bitmap bmSource = BitmapFactory.decodeFile(filepath);
		return bmSource;
	} catch (MalformedURLException e) {
		return null;
	} catch (IOException e) {
		return null;
	}
}