我想检测时，在我的Andr​​oid手机的物理菜单按钮已经pssed $ P $。我虽然code以下会工作，但事实并非如此。我要去哪里错了吗？

返回的错误是非法修改参数的onkeydown;只有最终被允许

 公共布尔的onkeydown（INT键code，KeyEvent的事件）{
    如果（键code == KeyEvent.KEY code_MENU）{
        //做的东西
    } 其他 {
        返回super.onKeyDown（键code，事件）;
    }
}
 

解决方案

我会寻找一个的了的按键事件，而不是一个下的情况下，用的onkeyup 。

 公共布尔的onkeyup（INT键code，KeyEvent的事件）{
    如果（键code == KeyEvent.KEY code_MENU）{
        // ........
        返回true;
    }
    返回super.onKeyUp（键code，事件）;
}
 

我们返回真，因为我们正在处理事件;返回假如果你希望系统来处理事件了。

您可以做到这一切在你的活动实例太多，因为活动是的KeyEvent 。

I am trying to detect when the physical Menu button on my Android phone has been pressed. I though the code below would work but it does not. Where am I going wrong please?

The error returned is 'Illegal modifier for parameter onKeyDown; only final is permitted'

public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_MENU) {
        // Do Stuff
    } else {
        return super.onKeyDown(keyCode, event);
    }
}

I'd look for an up key event, rather than a down event, with onKeyUp.

public boolean onKeyUp(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_MENU) {
        // ........
        return true;
    }
    return super.onKeyUp(keyCode, event);
}

We return true because we're handling the event; return false if you want the system to handle the event too.

You can do all of this in your Activity instance too because Activity is a known indirect subclass of KeyEvent.