如何在Android中制作YouTube视频缩略图?

时间:2012-01-12 19:34:12

标签: android youtube

在我的Android活动中,我想通过YouTube应用程序或其他方式从YouTube播放视频。为此,我想在我的活动中加载视频的缩略图。

这可能吗?如果是这样,怎么样?

4 个答案:

答案 0 :(得分:58)

YouTube将视频的缩略图放在特定的可预测网址上。这会有点痛苦,但我确信您可以找到一种方法来显示URL中的图像,或者下载它们然后显示它们。

以下是我的博客上有关这些缩略图网址的信息: http://alamoxie.com/blog/web-design/add-youtube-thumbnails/

我将复制并粘贴我在博文中写的内容:

查看视频的链接,例如http://www.youtube.com/watch?v=GDFUdMvacI0

video ID ... “v=”之后的部分,在本例中为GDFUdMvacI0。如果URL长于此值,则只能执行下一个&符号。例如,http://www.youtube.com/watch?v=GDFUdMvacI0&feature=youtu.be是相同的,GDFUdMvacI0

然后,只需将您的视频ID替换为以下网址中的视频ID即可:

0.jpg是一张全尺寸图片。其他三个非常小(120×90),并由YouTube从视频中的三个特定点自动拍摄。

答案 1 :(得分:23)

  • 下载picasso jar文件并将该jar文件放入" libs"夹

  • 使用picasso下载图片

  • 使用方法extractYoutubeId(url)从YoutubeVideo网址中提取youtube ID

要获取youtube视频的图片,请使用指定的链接,并将youtube id放在该网址中,如下所示:"http://img.youtube.com/vi/"+extractYoutubeId(url)+"/0.jpg"

Youtube_Video_thumnail

    package com.app.download_video_demo;

    import java.net.MalformedURLException;
    import java.net.URL;

    import android.app.Activity;
    import android.os.Bundle;
    import android.util.Log;
    import android.widget.ImageView;

    import com.squareup.picasso.Picasso;


    // get Picasso jar file and put that jar file in libs folder

    public class Youtube_Video_thumnail extends Activity
    {
        ImageView iv_youtube_thumnail,iv_play;
        String videoId;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);
            super.setContentView(R.layout.youtube_video_activity);

            init();

            try 
            {
                videoId=extractYoutubeId("http://www.youtube.com/watch?v=t7UxjpUaL3Y");

                Log.e("VideoId is->","" + videoId);

                String img_url="http://img.youtube.com/vi/"+videoId+"/0.jpg"; // this is link which will give u thumnail image of that video

                // picasso jar file download image for u and set image in imagview

                Picasso.with(Youtube_Video_thumnail.this)
                .load(img_url) 
                .placeholder(R.drawable.ic_launcher) 
                .into(iv_youtube_thumnail);

            } 
            catch (MalformedURLException e) 
            {
                e.printStackTrace();
            }

        }
        public void init()
        {
            iv_youtube_thumnail=(ImageView)findViewById(R.id.img_thumnail);
            iv_play=(ImageView)findViewById(R.id.iv_play_pause);
        }

        // extract youtube video id and return that id
        // ex--> "http://www.youtube.com/watch?v=t7UxjpUaL3Y"
        // videoid is-->t7UxjpUaL3Y


        public String extractYoutubeId(String url) throws MalformedURLException {
            String query = new URL(url).getQuery();
            String[] param = query.split("&");
            String id = null;
            for (String row : param) {
                String[] param1 = row.split("=");
                if (param1[0].equals("v")) {
                    id = param1[1];
                }
            }
            return id;
        }

    }

youtube_video_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <RelativeLayout
        android:id="@+id/webvideo_layout2"
        android:layout_width="250dp"
        android:layout_height="180dp"
        android:layout_gravity="center"
        android:layout_marginBottom="10dp"
        android:layout_marginTop="10dp"
        >


        <ImageView
            android:id="@+id/img_thumnail"
            android:layout_width="250dp"
            android:layout_height="180dp"
            android:layout_centerInParent="true"
            android:scaleType="fitXY" />

        <ImageView
            android:id="@+id/iv_play_pause"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:src="@drawable/icn_play" />
    </RelativeLayout>

</LinearLayout>

答案 2 :(得分:7)

试试这个

public static String getYoutubeThumbnailUrlFromVideoUrl(String videoUrl) {
   return "http://img.youtube.com/vi/"+getYoutubeVideoIdFromUrl(videoUrl) + "/0.jpg";
}

public static String getYoutubeVideoIdFromUrl(String inUrl) {
   inUrl = inUrl.replace("&feature=youtu.be", "");
   if (inUrl.toLowerCase().contains("youtu.be")) {
       return inUrl.substring(inUrl.lastIndexOf("/") + 1);
   }
   String pattern = "(?<=watch\\?v=|/videos/|embed\\/)[^#\\&\\?]*";
   Pattern compiledPattern = Pattern.compile(pattern);
   Matcher matcher = compiledPattern.matcher(inUrl);
   if (matcher.find()) {
      return matcher.group();
   }
   return null;
}

答案 3 :(得分:2)

这可能对某人有所帮助。我们的想法是首先获取您想要的视频,我在这里检索了播放列表中的视频列表。之后我用了这个课:
http://blog.blundell-apps.com/imageview-with-loading-spinner/
在从网络中检索缩略图时显示进度条。

    /***
 * Fetch all videos in a playlist
 * @param playlistId
 * @return
 * @throws ClientProtocolException
 * @throws IOException
 * @throws JSONException
 */
public YouTubePlaylist fetchPlaylistVideos(String playlistId) throws ClientProtocolException, IOException, JSONException {
    String playlistUrl = "https://gdata.youtube.com/feeds/api/playlists/" + playlistId + "?v=2&alt=jsonc";
    HttpClient client = new DefaultHttpClient();
    HttpUriRequest request = new HttpGet(playlistUrl);
    HttpResponse response = client.execute(request);
    String jsonString = GeneralHelpers.convertToString(response.getEntity().getContent());
    JSONObject json = new JSONObject(jsonString);

    if (jsonString.contains("Playlist not found")) {
        Log.e(TAG, "playlist not found. id: " + playlistId);
        return null;
    }

    JSONArray jsonArray = json.getJSONObject("data").getJSONArray("items");

    String playlistTitle = json.getJSONObject("data").getString("title");
    String author = json.getJSONObject("data").getString("author");

    List<YouTubeVideo> videos = new ArrayList<YouTubeVideo>();
    for (int i = 0; i < jsonArray.length(); i++) {
        JSONObject video = jsonArray.getJSONObject(i).getJSONObject("video");
        // The title of the video
        String title = video.getString("title");

        String url;
        try {
            url = video.getJSONObject("player").getString("mobile");
        } catch (JSONException ignore) {
            url = video.getJSONObject("player").getString("default");
        }

        String thumbUrl = video.getJSONObject("thumbnail").getString("sqDefault");
        String videoId = video.getString("id");
        String uploaded = video.getString("uploaded");
        String duration = video.getString("duration");
        String minutes = (Integer.parseInt(duration) / 60 < 10) ? "0" + (Integer.parseInt(duration) / 60) : "" + (Integer.parseInt(duration) / 60);
        String seconds = (Integer.parseInt(duration) % 60 < 10) ? "0" + (Integer.parseInt(duration) % 60): "" + (Integer.parseInt(duration) % 60); 
        duration = minutes + ":" + seconds;

        videos.add(new YouTubeVideo(title, author, url, thumbUrl, videoId, uploaded, duration));
    }

    YouTubePlaylist playlist = new YouTubePlaylist(author, playlistId, playlistTitle, videos);
    return playlist;
}//end fetchPlaylistVideos