<?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>