Egret Engine（十一）：音频加载

定义播放按钮

// 播放按钮
const playLabel: egret.TextField = new egret.TextField();
playLabel.text = "PLAY";
playLabel.touchEnabled = true;

通过Sound加装音频

const sound: egret.Sound = new egret.Sound();

sound.addEventListener(egret.Event.COMPLETE, function (event: egret.Event) {

    this.addChild(playLabel);
    playLabel.addEventListener(egret.TouchEvent.TOUCH_TAP, function (event: egret.Event) {
        sound.play();
    }, this);
    
}, this);

sound.addEventListener(egret.IOErrorEvent.IO_ERROR, function (event: egret.IOErrorEvent) {
    console.log("loaded error!");
}, this);

sound.load("resource/assets/sound.mp3");

通过 URLLoader 加装音频

const loader: egret.URLLoader = new egret.URLLoader();

loader.addEventListener(egret.Event.COMPLETE, function (event: egret.Event) {

    const sound: egret.Sound = loader.data;
    
    this.addChild(playLabel);
    playLabel.addEventListener(egret.TouchEvent.TOUCH_TAP, function (event: egret.Event) {
        sound.play();
    }, this);
    
}, this);

loader.dataFormat = egret.URLLoaderDataFormat.SOUND;

loader.load(new egret.URLRequest("resource/assets/sound.mp3"));

通过 res 加装音频

const sound: egret.Sound = RES.getRes("sound_mp3");

this.addChild(playLabel);
playLabel.addEventListener(egret.TouchEvent.TOUCH_TAP, function (event: egret.Event) {
    sound.play();
}, this);

播放停止示例

let sound: egret.Sound;
let soundChannel: egret.SoundChannel;

//创建 URLLoader 对象
const loader: egret.URLLoader = new egret.URLLoader();

//设置加载方式为声音
loader.dataFormat = egret.URLLoaderDataFormat.SOUND;

//添加加载完成侦听
loader.addEventListener(egret.Event.COMPLETE, function (event: egret.Event) {

    const loader: egret.URLLoader = <egret.URLLoader>event.target;
    
    //获取加载到的 Sound 对象
    sound = <egret.Sound>loader.data;

    this.addChild(playLabel);
    playLabel.addEventListener(egret.TouchEvent.TOUCH_TAP, onTouch, this);

}, this);

//开始加载
loader.load(new egret.URLRequest("resource/assets/sound.mp3"));

function onTouch() {

    console.log(soundChannel);
    if (soundChannel) {
        soundChannel.stop();
        soundChannel = null;
        return;
    }
    soundChannel = sound.play(); // 使用SoundChannel播放音频

    //Egret 3.0.4 新增获取音频长度 length 属性。
    console.log(sound.length);

    soundChannel.addEventListener(egret.Event.SOUND_COMPLETE, function (event: egret.Event): void {
        console.log("onSoundComplete");
    }, this);
    
}