Windows 8 Audio playing in background

问题

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

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);

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;
}

*Note musicplayr is the reference for the html5 tag

Any help appreciated why this is not working?

回答1:

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

来源：https://stackoverflow.com/questions/14783618/windows-8-audio-playing-in-background

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javascript

html5

windows-8

microsoft-metro

windows-store-apps