java - dispatchKeyEvent()调用两次

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dispatchKeyEvent calling method twice
                                
                                    （1个答案）
                                
                        
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我调试了以下代码片段，并知道方法dispatchKeyEvent()被调用了两次。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);
}

最佳答案

dispatchKeyEvent触发两次：第一次按下按键，第二次按下按键，因此您必须过滤：

 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;

            }