Android的后退按钮code永远不会执行 [英] Android Back button code never executed

问题描述

我在我的活动如下code。我必须设置为所有这些方法断点。当我preSS菜单按钮，进入onKeyDown和的onkeyup。当我preSS后退按钮，应用程序关闭和电话回到主屏幕不传递任何我的断点。

I have the following code in my Activity. I have Breakpoints set to all of these methods. When I press the Menu button, it enters onKeyDown and onKeyUp. When I press the back button, the app closes and phone goes back to home screen without passing any of my breakpoints.

编辑：
这可能要根据多数来源工作：

This could should work according to most sources:

@Override
public void onBackPressed() {
    SwitchToMenuState();
}

然而，事实并非如此。我曾尝试以下code块的所有排列，并且他们都没有得到过名为：

However, it doesn't. I have tried all permutations of the following code blocks, and neither of them ever get called:

@Override
public void finish()
{
    SwitchToMenuState();
}   

public boolean onKeyUp(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        SwitchToMenuState();
    }
    return true;
}

public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        SwitchToMenuState();
    }
    return true;
}   

我使用的是Android 2.3和加工，但似乎在所有涉及到处理它不会。 Eclipse的告诉我，我重写android.app.Activity.onBack pressed。

I am using Android 2.3 and Processing, although it doesn't seem to be related to Processing at all. Eclipse tells me that I am overriding android.app.Activity.onBackPressed.

推荐答案

所有你需要的是的onkeydown

All you need is onKeyDown

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {

        //Your code here

            return true;
    }
    return super.onKeyDown(keyCode, event);
}

我想这是因为你没有返回超级一部分。这个工作对我来说，你不需要onback pressed或等的onkeyup

I think it's because you're not returning the super part. This works for me, you don't need the onbackpressed or onkeyup etc.

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