新手问题：增加RadioGroup监听器，运行出错

Question

RadioGroup 监听器

Answer 1

奇怪上面代码的颜色没有变过来，就是如果不加23至35行监听器的代码，就可运行，加了就报错
 
监听器的代码如下：
   //为RadioGroup设置监听器         
   genderGroup.setOnCheckedChangeListener(new OnCheckedChangeListener()    
      {              
    @Override           
     public void onCheckedChanged(RadioGroup group, int checkedId)          
    {           
                   if(femaleButton.getId()==checkedId){             
                               System.out.println("female");                  
                 }                       
              else if(maleButton.getId()==checkedId){    
                    System.out.println("male");        
            }      
      }     
      });

Answer 2

单独写一个OnCheckedChangeListener试试