dispatchKeyEvent（）调用两次

Question

我调试了以下代码片段，并知道调用方法dispatchKeyEvent()两次。请提出解决方案

@Override 
public boolean dispatchKeyEvent(KeyEvent event) { 
if(event.getKeyCode()== KeyEvent.KEYCODE_DPAD_CENTER) 
    { 
     if(cDetail.getVisibility()==View.VISIBLE ) 
     { 

      cDetail.setVisibility(View.INVISIBLE); 
      cList.setVisibility(View.INVISIBLE); 
     } 

     else 
     { 

      cDetail.setVisibility(View.VISIBLE); 
      cList.setVisibility(View.VISIBLE); 

     } 


    } 

    return super.dispatchKeyEvent(event); 
} 

Answer 1

dispatchKeyEvent火两次：第一次按下按键，并为关键了第二次，所以你必须过滤：

if (event.getAction()!=KeyEvent.ACTION_DOWN) 
       return true; 

      switch (keyCode) { 
      case KeyEvent.KEYCODE_1 : 
       MakeToast(1); 
       break; 
      case KeyEvent.KEYCODE_2 : 
       MakeToast(2); 
       break; 
      case KeyEvent.KEYCODE_3 : 
       MakeToast(3); 
       break; 

      }