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FLASH控制動畫聲音的停止和播放

   今天有閃友問到如何控制AS3中的聲音問題,用下面的小實例說明:

Flash

  /*

  As3Sound.as

  */

  package {

  import flash.display.Sprite;

  import flash.events.*;

  import flash.media.Sound;

  import flash.media.SoundChannel;

  import flash.net.URLRequest;

  import flash.utils.Timer;

  import flash.text.TextField;

  import flash.text.TextFieldAutoSize;

  import flash.filters.DropShadowFilter;

  public class As3Sound extends Sprite {

  private var url:String = "http://XXX.com/music/XXX.mp3";

  private var soundFactory:Sound;

  private var channel:SoundChannel;

  private var positionTimer:Timer;

  private var play_btn:Sprite;

  private var stop_btn:Sprite;

  private var d_filtersropShadowFilter=new DropShadowFilter(5,45,0x000000,80,8,8);

  //用於記錄音樂現在是否為暫停狀態

  private var bSoundStop:Boolean = false;

  public function As3Sound() {

  var sxl_txt:TextField = new TextField();

  sxl_txt.text="CS4中如何控制聲音的播放或停止的";

  sxl_txt.autoSize=TextFieldAutoSize.LEFT;

  sxl_txt.x=stage.stageWidth/2-sxl_txt.width/2;

  sxl_txt.y=20;

  addChild(sxl_txt);

  var mp3_request:URLRequest = new URLRequest(url);

  soundFactory = new Sound();

  //成功加載數據後

  soundFactory.addEventListener(Event.COMPLETE, completeHandler);

  //在存在可用於 MP3 聲音的 ID3 數據時

  soundFactory.addEventListener(Event.ID3, id3Handler);

  //加載音樂錯誤時

  soundFactory.addEventListener(IOErrorEvent.IO_ERROR, ioErrorHandler);

  //音樂加載中...

  soundFactory.addEventListener(ProgressEvent.PROGRESS, progressHandler);

  soundFactory.load(mp3_request);

  channel = soundFactory.play();

  //音樂播放完成

  channel.addEventListener(Event.SOUND_COMPLETE, soundCompleteHandler);

  //用Timer監聽音樂的播放進度

  positionTimer = new Timer(1000);

  positionTimer.addEventListener(TimerEvent.TIMER, positionTimerHandler);

  positionTimer.start();

  //創建一個按鈕,用於播放音樂

  play_btn = new Sprite();

  play_btn.graphics.beginFill(0xFFCC32);

  play_btn.graphics.drawRoundRect(0, 0, 70, 18, 10, 10);

  play_btn.graphics.endFill();

  var play_txt:TextField = new TextField();

  play_txt.text = "播放";

  play_txt.x=18;

  play_btn.x=50;

  play_btn.y=100;

  play_txt.selectable = false;

  play_btn.addChild(play_txt);

  play_btn.filters=[d_filters];

  play_btn.addEventListener(MouseEvent.CLICK, soundPlay);

  addChild(play_btn);

  //創建一個按鈕,用於停止音樂

  stop_btn = new Sprite();

  stop_btn.graphics.beginFill(0xFFCC32);

  stop_btn.graphics.drawRoundRect(0, 0, 70, 18, 10, 10);

  stop_btn.graphics.endFill();

  stop_btn.x=130;

  stop_btn.y=100;

  var stop_txt:TextField = new TextField();

  stop_txt.x=18;

  stop_txt.text = "暫停";

  stop_txt.selectable = false;

  stop_btn.addChild(stop_txt);

  stop_btn.filters=[d_filters];

  stop_btn.addEventListener(MouseEvent.CLICK, soundStop);

  addChild(stop_btn);

  }

  //監聽音樂的播放進度

  private function positionTimerHandler(event:TimerEvent):void {

  var ybf:int = channel.position.toFixed(0);

  var zcd:int = soundFactory.length;

  var bfs:int = Math.floor(ybf/zcd*100);

  //trace("音樂總長度:"+zcd, "音樂已播放:"+ybf, "播放進度為:"+bfs+"%");

  }

  //加載音樂完成時

  private function completeHandler(event:Event):void {

  //trace("加載音樂完成: " + event);

  }

  //在存在可用於MP3聲音的ID3數據時

  private function id3Handler(event:Event):void {

  //trace("音樂的ID3信息如下:");

  for (var s in soundFactory.id3) {

  //trace(" ", s, ":", soundFactory.id3[s]);

  }

  //trace("關於ID3信息介紹,請參見Sound類-->屬性-->id3");

  }

  //加載音樂錯誤時

  private function ioErrorHandler(event:Event):void {

  //trace("加載音樂錯誤,錯誤信息如下:" + event);

  positionTimer.stop();

  }

  //加載音樂時

  private function progressHandler(eventrogressEvent):void {

  var yjz:int = event.bytesLoaded;

  var zcd:int = event.bytesTotal;

  var bfs:int = Math.floor(yjz/zcd*100);

  //trace("音樂總長度:"+zcd,"已加載: "+yjz, "加載進度為:"+bfs+"%");

  }

  //音樂播放完成

  private function soundCompleteHandler(event:Event):void {

  //trace("音樂播放完成: " + event);

  positionTimer.stop();

  }

  //點擊播放按鈕事件

  private function soundPlay(event:MouseEvent):void {

  if (bSoundStop) {

  bSoundStop = false;

  channel = soundFactory.play(channel.position.toFixed(0));

  }

  }

  //點擊停止按鈕事件

  private function soundStop(event:MouseEvent):void {

  if (!bSoundStop) {

  bSoundStop = true;

  channel.stop();

  }

  }

  }

  }

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