Coco2d-js/Cocos2d-html5中Android返回键实现

心已赠人 2022-08-09 00:57 68阅读 0赞

**导语：**

首先Cocos2d-x当中实现Menu和Back按键相对简单一点，而在资源较少的Cocos2d-html5当中，要实现返回还是有一点不一样的，而且有没有具体的demo，也就只有自己去看api文档，这也是头痛的一件事情，以下总结和归纳在Cocos2d-html5当中，如何实现返回键，和Menu键。

**分析：**

cocos2d中目前只有Layer以及其子类能够获取用户输入，即触发用户输入的事件。这个结论是我通过查看API文档猜测的，因为要触发这些事件，必须要有setIsKeypadEnabled和setIsTouchEnabled方法，而API中只有layer和其子类有这两个方法，所以很自然要实现返回必须是在Layer场景或者其子类去实现。

**代码：**

<table style="margin:0px; padding:0px; width:552px; color:rgb(255,255,255); background:rgb(75,75,75)"> 
 <tbody> 
  <tr> 
   <td style="margin:0px; padding:0px; font-family:Verdana,宋体,sans-serif; line-height:18px"> 
    <div>
      &nbsp; &nbsp;&nbsp; &nbsp;&nbsp;  
    </div> 
    <div>
      &nbsp; &nbsp;&nbsp; &nbsp;myLayer.backClicked=function(){ 
    </div> 
    <div>
      &nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;cc.log("back Clicked"); 
    </div> 
    <div>
      &nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;cc.AudioEngine.getInstance().stopAllEffects(); 
    </div> 
    <div>
      &nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;cc.BuilderReader.runScene("", "LevelLayer"); 
    </div> 
    <div>
      &nbsp; &nbsp;&nbsp; &nbsp;} 
    </div> 
    <div>
      &nbsp; &nbsp;&nbsp; &nbsp;  
     <span style="word-wrap:normal; word-break:normal; line-height:21px">myLayer</span>.setKeypadEnabled(true); 
    </div> 
    <div> 
     <br> 
    </div> 
    <div>
      备注：此方法只适合使用cocosEditord的时候使用，cocos2d-js3.0之后的版本请使用以下的代码 
    </div> 
    <div> 
     <div> 
      <span style="font-family:Verdana; font-size:12px; word-wrap:normal; word-break:normal; line-height:19.5px"><span style="word-wrap:normal; word-break:normal; line-height:normal">cc.eventManager.addListener({event: cc.EventListener.KEYBOARD,onKeyReleased: function(keyCode, event){ </span></span> 
     </div> 
     <div> 
      <span style="font-family:Verdana; font-size:12px; word-wrap:normal; word-break:normal; line-height:19.5px"><span style="word-wrap:normal; word-break:normal; line-height:normal">if(keyCode == cc.KEY.back){ </span></span> 
     </div> 
     <div> 
      <span style="font-family:Verdana; font-size:12px; word-wrap:normal; word-break:normal; line-height:19.5px"><span style="word-wrap:normal; word-break:normal; line-height:normal">}</span></span> 
     </div> 
     <div> 
      <span style="font-family:Verdana; font-size:12px; word-wrap:normal; word-break:normal; line-height:19.5px"><span style="word-wrap:normal; word-break:normal; line-height:normal">else if(keyCode == cc.KEY.menu){ </span></span> 
     </div> 
     <div> 
      <span style="font-family:Verdana; font-size:12px; word-wrap:normal; word-break:normal; line-height:19.5px"><span style="word-wrap:normal; word-break:normal; line-height:normal"><br> </span></span> 
     </div> 
     <div> 
      <span style="font-family:Verdana; font-size:12px; word-wrap:normal; word-break:normal; line-height:19.5px"><span style="word-wrap:normal; word-break:normal; line-height:normal">}}}, this);</span></span> 
     </div> 
     <div> 
      <span style="font-family:Verdana; font-size:12px; word-wrap:normal; word-break:normal; line-height:19.5px"><span style="word-wrap:normal; word-break:normal; line-height:normal"><br> </span></span> 
     </div> 
     <div> 
      <span style="font-family:Verdana; font-size:12px; word-wrap:normal; word-break:normal; line-height:19.5px"><span style="word-wrap:normal; word-break:normal; line-height:normal">cc.eventManager.addCustomListener(cc.game.EVENT_HIDE, function(){ </span></span> 
     </div> 
     <div> 
      <span style="font-family:Verdana; font-size:12px; word-wrap:normal; word-break:normal; line-height:19.5px"><span style="word-wrap:normal; word-break:normal; line-height:normal">//onEnterBackground handler</span></span> 
     </div> 
     <div> 
      <span style="font-family:Verdana; font-size:12px; word-wrap:normal; word-break:normal; line-height:19.5px"><span style="word-wrap:normal; word-break:normal; line-height:normal">});</span></span> 
     </div> 
     <div> 
      <span style="font-family:Verdana; font-size:12px; word-wrap:normal; word-break:normal; line-height:19.5px"><span style="word-wrap:normal; word-break:normal; line-height:normal">cc.eventManager.addCustomListener(cc.game.EVENT_SHOW, function(){ </span></span> 
     </div> 
     <div> 
      <span style="font-family:Verdana; font-size:12px; word-wrap:normal; word-break:normal; line-height:19.5px"><span style="word-wrap:normal; word-break:normal; line-height:normal">//onEnterForeground handler</span></span> 
     </div> 
     <div> 
      <span style="font-family:Verdana; font-size:12px; word-wrap:normal; word-break:normal; line-height:19.5px"><span style="word-wrap:normal; word-break:normal; line-height:normal">});</span></span> 
     </div> 
    </div> 
    <div> 
     <span style="font-family:Verdana; font-size:12px; word-wrap:normal; word-break:normal; line-height:19.5px"><span style="word-wrap:normal; word-break:normal; line-height:normal"><br> </span></span> 
    </div> </td> 
  </tr> 
 </tbody> 
</table>

源引：http://blog.sina.com.cn/s/blog\_7dbac1250101pkc7.html