Windows 8音频在后台播放 [英] Windows 8 Audio playing in background

问题描述

我已经阅读了以前关于此的帖子和microsoft的文档，但似乎无法让我的应用程序在后台运行Sound。它播放100％但是当应用程序暂停时，音乐也会停止。我添加了后台任务声明选择音频，我的音频标签看起来像这样

I have read previous posts on this and documents by microsoft but cannot seem to get my app to run Sound in the background. It plays 100% but when ever the app is then suspended the music also stops. I have added "Background Tasks" declarations selecting Audio and my audio tag looks like this

<audio id="musicplayr" msAudioCategory="BackgroundCapableMedia" controls="controls"><source src="song.mp3"/> </audio

最后我的javascript包含对MediaControls的引用

and finally my javascript includes the references to MediaControls

var MediaControls = Windows.Media.MediaControl;

        // Add event listeners for the buttons
        MediaControls.addEventListener("playpressed", play, false);
        MediaControls.addEventListener("pausepressed", pause, false);
        MediaControls.addEventListener("playpausetogglepressed", playpausetoggle, false);

        // Add event listeners for the audio element
        document.getElementById("musicplayr").addEventListener("playing", playing, false);
        document.getElementById("musicplayr").addEventListener("paused", paused, false);
        document.getElementById("musicplayr").addEventListener("ended", ended, false);

及以下代码我有事件处理程序

and below in the code i have the event handlers

// Define functions that will be the event handlers
function play() {
    document.getElementById("musicplayr").play();
}
function pause() {
    document.getElementById("musicplayr").pause();
}

function playpausetoggle() {
    if(MediaControls.isPlaying === true) {
        document.getElementById("musicplayr").pause();
    } else {
        document.getElementById("musicplayr").play();
    }
}

function playing() {
    Windows.Media.MediaControl.isPlaying = true;
}

function paused() {
    Windows.Media.MediaControl.isPlaying = false;
}

function ended() {
    Windows.Media.MediaControl.isPlaying = false;
}

*注意musicplayr是html5标签的参考

*Note musicplayr is the reference for the html5 tag

任何帮助都理解为什么这不起作用？

Any help appreciated why this is not working?

推荐答案

你还需要一个事件处理程序停止的事件。如果没有四个处理程序中的任何一个 - playpressed，pausepressed，playpausetogglepressed和stoppressed - 将不会启用背景音频。请参阅 http：// social。 msdn.microsoft.com/Forums/en-IN/winappswithhtml5/thread/2ca0c122-df31-401c-a444-2149dd3e8d68 在MSDN论坛上引发了同样的问题。

You also need an event handler for the stoppressed event. Without any of the four handlers--playpressed, pausepressed, playpausetogglepressed, and stoppressed--background audio won't be enabled. See http://social.msdn.microsoft.com/Forums/en-IN/winappswithhtml5/thread/2ca0c122-df31-401c-a444-2149dd3e8d68 on the MSDN forums where the same problem was raised.

.Kraig

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