如何处理回活动按钮 [英] How to handle back button in activity

问题描述

如何处理后退按钮的活动。在那里我有一些按钮。如果我按一下按钮它重定向到我需要的按钮中的一个。它的正常工作，但是当我preSS后退按钮它就会完成。

How to handle a back button in an activity. Where I have some buttons. If I click one of the button it's redirecting to the buttons which I required. It's working fine but When I press back button it gets finished.

如何解决这个问题。我只有一个为所有这些按钮的活动。 先谢谢了。

How to solve this problem. I have only one activity for all those buttons. Thanks in advance.

@Override
    public boolean onKeyDown(int keyCode, KeyEvent event) 
   {
        if ((keyCode == KeyEvent.KEYCODE_BACK)) 
        {
            return false; //I have tried here true also
        }
        return super.onKeyDown(keyCode, event);
   }

我已经用上面的code来处理后退按钮，但它不工作。当我preSS后退按钮的袭击有本身。

I have used above code to handle back button but its not working. When I press back button its struck there itself.

推荐答案

您可以使用处理这个问题：对于API级别5

You can handle this using: for API level 5

@Override
public void onBackPressed() {
    // your code.
}

和老年然后API 5使用这样的：

and for older then API 5 use this:

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        // your code
        return true;
    }

    return super.onKeyDown(keyCode, event);
}

享受！

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