使用Flex4做一个mp3 播放器

发布时间：2020-12-15 04:04:57 所属栏目：百科来源：网络整理

导读：http://www.cnblogs.com/modou/articles/1897088.html 1.先来做一个最简单的MP3播放功能 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 ?xml version= "1.0" ? encoding= "utf-8" ? s:Application x

http://www.cnblogs.com/modou/articles/1897088.html

1.先来做一个最简单的MP3播放功能

 
  
 
      
        <?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" 
        > 
       
???? 
        <s:layout> 
       
???????? 
        <s:BasicLayout/> 
       
</s:layout> 
       

         ? 
       
<fx:Script> 
       
<![CDATA[ 
       
????????????? 
       
???????????? 
        private? 
        var? 
        snd:Sound; 
       
channel:SoundChannel; 
       
????????????? 
       
protected? 
        function? 
        button1_clickHandler(event:MouseEvent): 
        void 
       
???????????? 
        { 
       
???????????????? 
        snd =  
        new? 
        Sound( 
        URLRequest( 
        "http://localhost/flex/1.mp3" 
        )); 
       
channel = snd.play(); 
       
} 
       

         ? 
       
button3_clickHandler(event:MouseEvent): 
        void 
       
{ 
       
channel.stop(); 
       
} 
       

         ? 
       
]]> 
       
</fx:Script> 
       

         ? 
       
<fx:Declarations> 
       
<!-- 将非可视元素（例如服务、值对象）放在此处 --> 
       
</fx:Declarations> 
       
<s:BorderContainer x= 
        "127"? 
        y= 
        "170"? 
        width= 
        "273"? 
        height= 
        "43" 
        > 
       
<s:Button x= 
        "47"? 
        "10"? 
        label 
        = 
        "播放"? 
        click= 
        "button1_clickHandler(event)" 
        /> 
       
"151"? 
        "停止"? 
        "button3_clickHandler(event)" 
        /> 
       
</s:BorderContainer> 
       
</s:Application> 
       
 
    

2.在上面例子的基础上，做一些改进，增加对进度，以及音量的控制

import? mx.controls.Alert;

mx.events.FlexEvent;

?????????????

snd:Sound;

channel:SoundChannel;

?????????????

void

{

));

channel = snd.play();

}

void

{

channel.stop();

}

hslider1_changeEndHandler(event:FlexEvent): void

{

channel.stop();

channel = snd.play(hslider1.value/hslider1.maximum * snd.length);

}

?????????????

hslider2_changeEndHandler(event:FlexEvent): void

{

???????????????? trans:SoundTransform = SoundTransform(hslider2.value/hslider2.maximum, 0 );

channel.soundTransform = trans;

}

]]>

</fx:Script>

<fx:Declarations>

</fx:Declarations>

<s:Label x= "126"? text= "进度："? "45" />

<s:HSlider id= "hslider1"? x= "179"? "221"? changeEnd= "hslider1_changeEndHandler(event)"? maximum= "100"? showDataTip= "false" />

"146"? "音量："? />

"hslider2"? "180"? "150"? "hslider2_changeEndHandler(event)"? "10"? />

?????

</s:BorderContainer>?

3.更近一步完善MP3播放功能

"600"? enterFrame= "application1_enterFrameHandler(event)" trans:SoundTransform;

playStatus: Number? = ;

playPosition: ;

?????????????

void

{

???????????????? // 标示当前播放状态，0是未加载，1是播放，2是暂停

???????????????? if (playStatus== 0? || playStatus== 1 )

???????????????????? )

???????????????????? {

???????????????????????? ));

trans = SoundTransform();

trans.volume = hslider2.value/hslider2.maximum;

}

?????????????????????

playButton. label? = "暂停" ;

channel = snd.play(playPosition);

playStatus = 2 ;

}

else? )

{

"播放" ;

channel.stop();

;

}

void

{

channel.stop();

channel = snd.play(hslider1.value/hslider1.maximum * snd.length);

}

?????????????

void

{

trans.volume = hslider2.value/hslider2.maximum;

channel.soundTransform = trans;

}

?????????????

???????????? // 把毫秒格式化为时间

formatDate(num: Number ): String

{

total: int? = int (num / 1000 );

second: = total% 60 ;

total = (total-second)/ ;

minute: ;

total = (total-minute)/ ;

hour: = total;

?????????????????

returnValue: String? "" ;

(hour!= ) returnValue = String (hour) + ":" ;

(minute< 10 ) returnValue += "0" ;

returnValue += (minute) + ;

(second< ;

(second);

return? returnValue;

}

// 把播放进度绑定到播放时间的标签上，以及调整进度的组件上

application1_enterFrameHandler(event:Event): void

{

timeLabel.text = formatDate(channel.position) + " / "? + formatDate(snd.length);

playPosition = channel.position;

hslider1.value = channel.position/snd.length * hslider1.maximum;

}

]]>

</fx:Script>

<fx:Declarations>

</fx:Declarations>

"131"? "147"? "369"? "108" >

"83"? />

"135"? "48"? />

"67"? />

"136"? "71"? value= "5"? />

<s:Button id= "playButton"? "12"? "53"? "button1_clickHandler(event)"? "55" />

<s:Label id= "timeLabel"? "139"? "00:00 / 00:00"? />

"播放进度：" />

</s:BorderContainer>?

这里针对上一个例子，做了如下修改：

1）可以显示当前MP3播放时间

2）用一个按钮控制MP3的播放、暂停状态

3) 把播放进度绑定到调整进度条组件上，随时更新进度条位置

做了这些改动，基本上算是一个MP3播放器了，虽然依然很简陋，毕竟只是一个学习的例子，就将就着吧，呵呵

（编辑：李大同）

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