如何在 WP7 - Phonegap 中播放嵌入式视频?

本文介绍了如何在 WP7 - Phonegap 中播放嵌入式视频?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我需要在我的 WP7 phonegap 应用程序中播放嵌入的视频文件.文件 (dizzy.mp4) 位于 www 文件夹中，布局如下

I need to play an embedded video file in my WP7 phonegap application. The file (dizzy.mp4) is located in the www folder along with the following layout

<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="width=device-width, height=device-height, initial-scale=1.0, maximum-scale=1.0, user-scalable=no;" />
    <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
    <title>PhoneGap WP7</title>
    <link rel="stylesheet" href="master.css" type="text/css" />
    <script type="text/javascript" charset="utf-8" src="phonegap-1.4.1.js"></script>
    <script type="text/javascript" charset="utf-8" src="jquery-1.6.4.min.js"></script>
</head>
<body>
    <video onclick="play()">
        <source src="http://html5demos.com/assets/dizzy.mp4" type="video/mp4" />
    </video>
    <video onclick="play()">
        <source src="./dizzy.mp4" type="video/mp4" />
    </video>
</body>
</html>

如果点击第一个视频元素，则视频文件正在从互联网下载，一切正常.但是在单击第二个(本地视频)后，只会出现一个带有正在打开..."标签的视频播放器屏幕.两个视频是同一个视频文件.

If the first video element is clicked, the video file is being downloaded from the Internet and all is ok. But after clicking on the second (local video) just a video player screen with 'Opening...' label appears. Both videos are the same video file.

该应用程序在模拟器和真实设备上运行(Nokia Lumnia 710 with WF7.5 Mango)，结果是一样的.

The app was run both on an emulator and on a real device (Nokia Lumnia 710 with WF7.5 Mango), the result is the same.

我尝试为视频文件设置不同的构建操作:内容、资源、嵌入资源.它没有帮助.

I tried to set different build actions to the video file: Content, Resource, Embedded Resource. It doesn't help.

如何让它发挥作用?

更新: 描述了一个类似的问题此处.是 WP7 的错误吗?

UPDATE: A similar issue is described here. Is it a WP7 bug?

推荐答案

这里有一个解决方法.以下代码是实现视频播放功能的Phonegap 命令.

Here is a workaround. The following code is a Phonegap command that implements video play back functionality.

using System;
using System.IO;
using System.IO.IsolatedStorage;
using System.Runtime.Serialization;
using System.Windows;
using System.Windows.Controls;
using Microsoft.Phone.Controls;
using WP7GapClassLib.PhoneGap;
using WP7GapClassLib.PhoneGap.Commands;
using WP7GapClassLib.PhoneGap.JSON;

namespace PhoneGap.Extension.Commands
{

    /// <summary>
    /// Implements video play back functionality.
    /// </summary>
    public class Video : BaseCommand
    {

        /// <summary>
        /// Video player object
        /// </summary>
        private MediaElement _player;

        [DataContract]
        public class VideoOptions
        {
            /// <summary>
            /// Path to video file
            /// </summary>
            [DataMember(Name = "src")]
            public string Src { get; set; }
        }

        public void Play(string args)
        {
            VideoOptions options = JsonHelper.Deserialize<VideoOptions>(args);

            Deployment.Current.Dispatcher.BeginInvoke(() =>
            {
                try
                {
                    _Play(options.Src);

                    DispatchCommandResult(new PluginResult(PluginResult.Status.OK));
                }
                catch (Exception e)
                {
                    DispatchCommandResult(new PluginResult(PluginResult.Status.ERROR, e.Message));
                }
            });
        }

        private void _Play(string filePath)
        {
            // this.player is a MediaElement, it must be added to the visual tree in order to play
            PhoneApplicationFrame frame = Application.Current.RootVisual as PhoneApplicationFrame;
            if (frame != null)
            {
                PhoneApplicationPage page = frame.Content as PhoneApplicationPage;
                if (page != null)
                {
                    Grid grid = page.FindName("LayoutRoot") as Grid;
                    if (grid != null && _player == null)
                    {
                        _player = new MediaElement();
                        grid.Children.Add(this._player);
                        _player.Visibility = Visibility.Visible;
                    }
                }
            }

            Uri uri = new Uri(filePath, UriKind.RelativeOrAbsolute);
            if (uri.IsAbsoluteUri)
            {
                _player.Source = uri;
            }
            else
            {
                using (IsolatedStorageFile isoFile = IsolatedStorageFile.GetUserStoreForApplication())
                {
                    if (isoFile.FileExists(filePath))
                    {
                        using (
                            IsolatedStorageFileStream stream = new IsolatedStorageFileStream(filePath, FileMode.Open,
                                                                                             isoFile))
                        {
                            _player.SetSource(stream);
                        }
                    }
                    else
                    {
                        throw new ArgumentException("Source doesn't exist");
                    }
                }
            }

            _player.Play();
        }
    }

}

这里只有播放功能，但可以扩展支持停止/暂停/关闭等.

There is only the Play function here, but it can be extended to support Stop/Pause/Close ect.

在客户端注册这个命令:

To register this command on client side:

    <script type="text/javascript">

    function playVideo(src) {

        PhoneGap.exec(         //PhoneGap.exec = function(success, fail, service, action, args)
            null, //success
            null, //fail
            "Video", //service
            "Play", //action
            {src: src} //args
           );
    };
   </script>

播放文件:

<a href="#" class="btn" onClick="playVideo('/app/www/dizzy.mp4');">Play</a>

注意路径'/app/www/dizzy.mp4'.

Pay attention to the path '/app/www/dizzy.mp4'.

这篇关于如何在 WP7 - Phonegap 中播放嵌入式视频?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！