Flex显示麦克风当前音量

Flex动态显示麦克风当前音量

效果：

代码：

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
               xmlns:s="library://ns.adobe.com/flex/spark"
               xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"
               creationComplete="createMic()">
    <fx:Declarations>
        <!-- 将非可视元素（例如服务、值对象）放在此处 -->
    </fx:Declarations>
        <fx:Script>
            <![CDATA[
                import flash.media.Microphone;
                import flash.events.ActivityEvent;
                import flash.events.Event;
                import flash.events.StatusEvent;
                public var mic:Microphone;
                public function createMic():void
                {
                    mic = Microphone.getMicrophone();
                    mic.setLoopBack(true);
                    mic.addEventListener(ActivityEvent.ACTIVITY, activity);
                    mic.addEventListener(StatusEvent.STATUS, status);
                    mic.addEventListener(Event.ACTIVATE, active);
                }

                private function active(event:Event):void
                {
                    trace(' active ');
                }

                private function status(event:StatusEvent):void
                {
                    trace("status");
                }

                private function activity(event:ActivityEvent):void
                {
                    trace("active ");
                    addEventListener(Event.ENTER_FRAME, showMicLevel);
                }

                private function showMicLevel(event:Event):void
                {
                    trace(mic.gain+" "+mic.activityLevel+" "+mic.silenceLevel+
                        " "+mic.rate);
                    level.graphics.clear();
                    level.graphics.beginFill(0xccccff, 1);
                    level.graphics.drawRect(0, 0, (mic.activityLevel * 30),            100);
                    level.graphics.endFill();
                }
            ]]>
        </fx:Script>
        <mx:Canvas width="300" height="50" id="level"/>
</s:Application>