我创建了一个应用程序，其中有一个包含youtube链接的列表视图。现在我想使用chrome cast播放这些视频。我按照官方文档，我可以播放直接mp4链接的其他视频，但它不适用于youtube链接。
当然其他链接直接连接到视频（结尾* .mp4），但如何添加带有youtube链接的媒体？不知何故，我需要使用youtube链接创建一个MediaInfo对象，但我不知道该怎么做，或者甚至可能。
我找到了这个信息
MimeData data = new MimeData（“v = g1LsT1PVjUA”，MimeData.TYPE_TEXT）; mSession.startSession（“YouTube”，数据）;
Open Chromecast YouTube video from my Android app
但我不知道如何获得会话并使用youtube会话加载它。如果有人能帮助我，我将不胜感激。
感谢您的帮助
答案 0 :(得分：4)
我写了一个Android应用程序，该应用程序去年在大屏幕电视上播放VLC上的YouTube /本地媒体。它演奏得非常好，但我总是想用更优雅的东西取代VLC笔记本电脑。当Chromecast最终与官方SDK一起发布时，我感到非常兴奋。在尝试启动YouTube接收器应用程序播放YouTube视频时，我也遇到了同样的问题，因此我决定深入了解VLC是如何做到这一点的（开源很棒:)）我发现YouTube视频ID只是一个JavaScript页面里面嵌入了很多东西。诀窍是从中提取正确的信息。不幸的是，VLC脚本是用Lua编写的，所以我花了几个星期的时间学习Lua来浏览Lua脚本。你可以谷歌youtube.lua获取脚本的源代码。
我用Java重写了脚本，并且能够修改CastVideos Android以轻松播放YouTube视频。请注意，由于Chromecast只能播放mp4视频容器格式，因此其他格式的视频可能无法播放。
如果有人有兴趣，这是我的测试代码。您可以使用CastHelloVideo-chrome加载自定义媒体来测试网址。
享受，
DANH
package com.dql.urlexplorer;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
public class UrlExplore {
private static final String URL_ENCODED_STREAM_MAP = "\"url_encoded_fmt_stream_map\":";
private static final String VIDEO_TITLE_KEYWORD = "<meta name=\"title\"";
private static final String VIDEO_DESCRIPTION_KEYWORD = "<meta name=\"description\"";
private static final String VIDEO_THUMBNAIL_KEYWORD = "<meta property=\"og:image\"" ;
private static final String CONTENT_VALUE_KEYWORD = "content=\"";
//private static final String TEST_URL = "http://www.youtube.com/watch?v=JtyCM4BTbYo";
private static final String YT_UTRL_PREFIX = "http://www.youtube.com/watch?v=";
public static void main(String[] args) throws IOException {
while (true) {
String videoId = getVideoIdFromUser();
String urlSite = YT_UTRL_PREFIX + videoId;
System.out.println("URL = " + urlSite);
System.out.println("===============================================================");
System.out.println("Getting video site content");
System.out.println("===============================================================");
CloseableHttpClient httpclient = HttpClients.createDefault();
try {
HttpGet httpget = new HttpGet(urlSite);
System.out.println("Executing request " + httpget.getRequestLine());
// Create a custom response handler
ResponseHandler<String> responseHandler = new ResponseHandler<String>() {
public String handleResponse(
final HttpResponse response) throws ClientProtocolException, IOException {
int status = response.getStatusLine().getStatusCode();
if (status >= 200 && status < 300) {
HttpEntity entity = response.getEntity();
return entity != null ? EntityUtils.toString(entity) : null;
} else {
throw new ClientProtocolException("Unexpected response status: " + status);
}
}
};
String responseBody = httpclient.execute(httpget, responseHandler);
if (responseBody.contains(VIDEO_TITLE_KEYWORD)) {
// video title
int titleStart = responseBody.indexOf(VIDEO_TITLE_KEYWORD);
StringBuilder title = new StringBuilder();
char ch;
do {
ch = responseBody.charAt(titleStart++);
title.append(ch);
}
while (ch != '>');
String videoTitle = getKeyContentValue(title.toString());
System.out.println("Video Title = " + videoTitle);
}
if (responseBody.contains(VIDEO_DESCRIPTION_KEYWORD)) {
// video description
int descStart = responseBody.indexOf(VIDEO_DESCRIPTION_KEYWORD);
StringBuilder desc = new StringBuilder();
char ch;
do {
ch = responseBody.charAt(descStart++);
desc.append(ch);
}
while (ch != '>');
String videoDesc = getKeyContentValue(desc.toString());
System.out.println("Video Description = " + videoDesc);
}
if (responseBody.contains(VIDEO_THUMBNAIL_KEYWORD)) {
// video thumbnail
int thumbnailStart = responseBody.indexOf(VIDEO_THUMBNAIL_KEYWORD);
StringBuilder thumbnailURL = new StringBuilder();
char ch;
do {
ch = responseBody.charAt(thumbnailStart++);
thumbnailURL.append(ch);
}
while (ch != '>');
String videoThumbnail= getKeyContentValue(thumbnailURL.toString());
System.out.println("Video Thumbnail = " + videoThumbnail);
}
if (responseBody.contains(URL_ENCODED_STREAM_MAP)) {
// find the string we are looking for
int start = responseBody.indexOf(URL_ENCODED_STREAM_MAP) + URL_ENCODED_STREAM_MAP.length() + 1; // is the opening "
String urlMap = responseBody.substring(start);
int end = urlMap.indexOf("\"");
if (end > 0) {
urlMap = urlMap.substring(0, end);
}
String path = getURLEncodedStream(urlMap);
System.out.println("Video URL = " + path);
}
}
finally {
httpclient.close();
}
System.out.println( "===============================================================");
System.out.println("Done: ");
System.out.println("===============================================================");
}
}
static String getURLEncodedStream(String stream) throws UnsupportedEncodingException {
// replace all the \u0026 with &
String str = stream.replace("\\u0026", "&");
//str = java.net.URLDecoder.decode(stream, "UTF-8");
//System.out.println("Raw URL map = " + str);
String urlMap = str.substring(str.indexOf("url=http") + 4);
// search urlMap until we see either a & or ,
StringBuilder sb = new StringBuilder();
for (int i = 0; i < urlMap.length(); i++) {
if ((urlMap.charAt(i) == '&') || (urlMap.charAt(i) == ','))
break;
else
sb.append(urlMap.charAt(i));
}
//System.out.println(java.net.URLDecoder.decode(sb.toString(),"UTF-8"));
return java.net.URLDecoder.decode(sb.toString(),"UTF-8");
}
static String getKeyContentValue(String str) {
StringBuilder contentStr = new StringBuilder();
int contentStart = str.indexOf(CONTENT_VALUE_KEYWORD) + CONTENT_VALUE_KEYWORD.length();
if (contentStart > 0) {
char ch;
while (true) {
ch = str.charAt(contentStart++);
if (ch == '\"')
break;
contentStr.append(ch);
}
}
try {
return java.net.URLDecoder.decode(contentStr.toString(),"UTF-8");
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
/*
* Prompt the user to enter a video ID.
*/
private static String getVideoIdFromUser() throws IOException {
String videoId = "";
System.out.print("Please enter a YouTube video Id: ");
BufferedReader bReader = new BufferedReader(new InputStreamReader(System.in));
videoId = bReader.readLine();
if (videoId.length() < 1) {
// Exit if the user doesn't provide a value.
System.out.print("Video Id can't be empty! Exiting program");
System.exit(1);
}
return videoId;
}
}`enter code here`
答案 1 :(得分：1)
我最近写了一个库来解决这个问题。 chromecast-sender。它是android-youtube-player库的扩展库，可轻松将视频从Android应用投射到Google Cast设备。
接收者使用YouTube IFrame播放器API。发件人和接收者通过自定义渠道进行通信。
答案 2 :(得分：0)
你不能用官方SDK做到这一点。有些人使用过iframe方法，但有不同的成功报告。
答案 3 :(得分：0)
我们可以使用当前的chromecast设备加入实时会话：使用下面的回调告诉我如果您想要同样如下，那么我将发送剩余部分代码。
private final GoogleApiClient.ConnectionCallbacks connectionCallback = new GoogleApiClient.ConnectionCallbacks() {
@Override
public void onConnected(Bundle bundle) {
// SDK confirms that GoogleApiClient is connected: GoogleApiClient.ConnectionCallbacks.onConnected
Trace.d(TAG, "GoogleApiClient.ConnectionCallbacks # onConnected()");
try {
// Sender app launches or join the receiver app: Cast.CastApi.launchApplication
Cast.CastApi.joinApplication(mApiClient).setResultCallback(connectionResultCallback);
} catch (Exception e) {
Trace.d(TAG, "Failed to join application");
}
}
@Override
public void onConnectionSuspended(int i) {
Trace.d(TAG, "GoogleApiClient.ConnectionCallbacks # onConnectionSuspended()");
try {
Cast.CastApi.leaveApplication(mApiClient);
} catch (Exception e) {
Trace.d(TAG, "Failed to join application");
}
}
};