有一个默认的返回键（器件）监听器在Android的？ [英] is there a default back key(on device) listener in android?

问题描述

我有两个活动A和B，当我点击一个该遗嘱的按钮显示B.当我点击B中它备份到答：我已经设置完成（）方法后overridePendingTransition方法的按钮。它工作正常。但如果目前的活动是B.在那个时候我单击默认后退按钮的设备。它显示向左转移的权利，显示的活性。

我怎么能监听设备默认返回键？

编辑：

  Log.v（TAG，回pressed）;
完（）;
overridePendingTransition（R.anim.slide_top_to_bottom，R.anim.hold）;
 

解决方案

  @覆盖
公共布尔的onkeydown（INT键code，KeyEvent的事件）{
    如果（键code == KeyEvent.KEY code_BACK和放大器;＆安培; event.getRepeatCount（）== 0）{
        //做一些事情就回来了。
        返回true;
    }

    返回super.onKeyDown（键code，事件）;
}
 

下面这个链接是关于如何处理返回键事件，写的Andr​​oid开发自己的详细说明：

<一个href="http://android-developers.blogspot.com/2009/12/back-and-other-hard-keys-three-stories.html">Using返回键

I am having two activities A and B. when i click the button in A that will shows B. when i click the Button in B it backs to A. i had set the overridePendingTransition method after the finish() method. it works properly. but in case the current Activity is B. on that time i click the default back button in the device. it shows the right to left transition to show the Activity A.

How i can listen that Default back key on device?

EDIT:

Log.v(TAG, "back pressed");
finish();
overridePendingTransition(R.anim.slide_top_to_bottom, R.anim.hold);

解决方案

@Override
public boolean onKeyDown(int keyCode, KeyEvent event)  {
    if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
        // do something on back.
        return true;
    }

    return super.onKeyDown(keyCode, event);
}

The following link is a detailed explanation on how to handle back key events, written by the Android developers themselves:

Using the back key

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