AS3 SoundChannel stop()不工作

Question

我有一个包含以下变量的SoundHandler类：

private static var musicChannel: SoundChannel;
private static var effectsChannel: SoundChannel;
private static var narrationChannel: SoundChannel;
private static var narrationMuted:Boolean;

在initialize函数中：

var classReference: Class = getDefinitionByName(narrationClassName) as Class; 
var s: Sound = new classReference(); 
narrationChannel = s.play();

效果和音乐通道工作正常，但在调用stop()时讲述通道不会停止。下面是函数：

    public static function playNarration(narrationClassName: String): void {
        if (!narrationMuted) {
            narrationChannel.stop(); //NOT WORKING--THE SOUND KEEPS PLAYING!
            var classReference: Class = getDefinitionByName(narrationClassName) as Class;
            var s: Sound = new classReference();
            narrationChannel = s.play();
        }
    }

SoundMixer.stopAll()确实停止了旁白声音，但我不能使用它，因为它还会停止音乐和效果声音。

我怀疑stop()不工作是因为我创建Sound对象的方式，但我不确定。外部加载并不能解决这个问题：

     public static function playNarration(narrationClassName: String): void {
            if (!narrationMuted) {
                narrationChannel.stop();
                var s: Sound = new Sound();
                s.addEventListener(Event.COMPLETE, onNarrationSoundLoaded);
                var req: URLRequest = new URLRequest("sounds/Narration/sub_narr_1.mp3");
                s.load(req);
            }
        }
        private static function onNarrationSoundLoaded(e: Event): void {
            var localSound: Sound = e.target as Sound;
            narrationChannel = localSound.play();
        }

将旁白声音作为静态变量也不起作用：

private static var subNarr1:Sound;

public static function playNarration(narrationClassName: String): void {
            if (!narrationMuted) {      
                narrationChannel.stop();
                narrationChannel = subNarr1.play();
            }
        }

任何帮助都是非常感谢的。谢谢!

Answer 1

我猜你的初始化函数被调用了两次。每次调用narrationChannel = s.play();时，都会丢失对前一个实例的引用。

例如，如果您这样做：

narrationChannel = s.play(); //narrationChannel points to what we'll call "instance 1"
narrationChannel = s.play(); //narrationChannel points to what we'll call "instance 2"
narrationChannel.stop(); //you just stopped 'instance 2' but 'instance 1' is still playing

尝试一下-每次在代码中的任何地方启动或停止s或narrationChannel时添加跟踪命令: trace (“停止通道！”)；narrationChannel.stop()；var classReference: classReference= getDefinitionByName(narrationClassName) as Class；var s: classReference=getDefinitionByName()；narrationClassName(“在通道中播放新声音！”)narrationChannel = s.play()；

在初始化函数中执行此操作，以及播放旁白和开始或停止声音或通道的任何其他位置。我怀疑您会在控制台输出中看到以下内容：

Playing new sound in the channel!
Playing new sound in the channel!
Stopping the channel!

这意味着您只需要在narrationChannel.stop()之前跟踪两次s.play()是如何被调用的

我可能完全错了，但对我来说，这似乎是最可能的解释。