如何获取仍在加载的声音对象的最终长度?

至少有两种选择:

1:将进度条保持在0%,在声音完全加载之前不要移动它。即:

sound.addEventListener(Event.COMPLETE, onSoundComplete);

private function onSoundComplete(event:Event):void {
    // Calculate progress
}

2:基于已加载文件的百分比的近似百分比。像这样:

private var _sound:Sound = /* Your logic here */;
private var _channel:SoundChannel = _sound.play();

_sound.addEventListener(ProgressEvent.PROGRESS, onSoundProgress);

private function onSoundProgress(event:ProgressEvent):void {
    var percentLoaded:Number = event.bytesLoaded / event.bytesTotal;
    var approxProgress:Number
        = _channel.position / _sound.length * percentLoaded;
    // Update your progress bar based on approxProgress
}

你也可以通过 ID3 标记声音是否正确 tagged .