egret-docs-master/Engine3D/sound/example/README.md

AudioManager的使用

通过 AudioManager 类 加载音频并播放音频

函数声明

通过调用 createSound 方法返回 Sound 音频源 对象

public createSound (url:string, success:Function=null, error:Function=null):Sound

通过调用 playSound 方法返回 Channel 对象 Channel 类控制应用程序中的声音

public playSound(sound: Sound, options: any)

AudioManager.instance.createSound("../resource/audio/1.mp3", (e) => {
	//Channel 类控制应用程序中的声音
	this._channel = AudioManager.instance.playSound(e, { "volume": 0.5, "loop": true });
	this._channel.play();
})

示例

在以下示例中，用户可暂停并重放声音文件

   private _channel: egret3d.Channel;
   private _sound: egret3d.Sound;
   private _txt: gui.UITextField;
   private _btnPlay: gui.UILabelButton;
   private _btnStop: gui.UILabelButton;
   private _btnPause: gui.UILabelButton;
   private startTime: number = 0;
    

   public initedGui() {


       this._txt = new gui.UITextField();
       this._txt.text = "Time：" + this.startTime;


       this._btnPlay = new gui.UILabelButton();
       this._btnPlay.label = "Play";
       this._btnPlay.width = 35;
       this._btnPlay.height = 20;
       this._btnPlay.x = 0;
       this._btnPlay.y = 50;

       this._btnStop = new gui.UILabelButton();
       this._btnStop.label = "Stop";
       this._btnStop.width = 35;
       this._btnStop.height = 20;
       this._btnStop.x = 40;
       this._btnStop.y = 50;

       this._btnPause = new gui.UILabelButton();
       this._btnPause.label = "Pause";
       this._btnPause.width = 35;
       this._btnPause.height = 20;
       this._btnPause.x = 80;
       this._btnPause.y = 50;


       this._view.addGUI(this._txt);
       this._view.addGUI(this._btnPlay);
       this._view.addGUI(this._btnStop);
       this._view.addGUI(this._btnPause);


       this.initListener();


   }

注册监听事件

    private initListener() {
        var self = this;
        self._btnPlay.addEventListener(egret3d.MouseEvent3D.MOUSE_CLICK, (e) => {

            if (this._channel) {
                if (!this._channel.isPlaying()) {
                    this._channel.unpause();//播放处于暂停状态的音频
                }

            }
            else {
                AudioManager.instance.createSound("../resource/audio/music.mp3", (e) => {
                    this._sound = e;
                    this._channel = AudioManager.instance.playSound(self._sound, { "volume": 0.5, "loop": true });
                    this._channel.play();
                })
            }

        }, this);

        self._btnStop.addEventListener(egret3d.MouseEvent3D.MOUSE_CLICK, (e) => {
            this._channel.stop();
            this.startTime = 0;
            this._txt.text = "Time：" + self.startTime;
        }, this);


        self._btnPause.addEventListener(egret3d.MouseEvent3D.MOUSE_CLICK, (e) => {
            if (this._channel.isPlaying())//如果媒体文件被暂停，则返回true，否则返回false
                this._channel.pause();//暂停处于播放状态的音频
        }, this);





        
        var drawMeter = function () {


            if (self._channel && self._channel.isPlaying()) {
                self._txt.text = "Time：" + self.startTime++;

            }
            requestAnimationFrame(drawMeter);

        }

        requestAnimationFrame(drawMeter)

   }

运行结果如图所示