检测Android中的物理菜单按键 [英] Detecting physical Menu key press in Android

问题描述

我试图检测我的 Android 手机上的物理菜单按钮何时被按下.我虽然下面的代码可以工作，但它没有.请问我哪里出错了?

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?

返回的错误是'Illegal modifier for parameter onKeyDown;只允许final'

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);
    }
}

推荐答案

我会寻找 up 键事件，而不是 down 事件，带有 onKeyUp.

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);
}

我们返回 true 因为我们正在处理事件；如果您希望系统也处理该事件，则返回 false.

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

您也可以在 Activity 实例中执行所有这些操作，因为 Activity 是 KeyEvent 的已知间接子类.

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

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