Android onKeyDown监听返回键无效

当我们的Activity继承了TabActivity,在该类中重写onKeyDown是监听不到返回键的,

具体解决方法如下:

重写dispatchKeyEvent

    /**
     * 退出
     */
    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        if (event.getKeyCode() == KeyEvent.KEYCODE_BACK
                && event.getAction() == KeyEvent.ACTION_DOWN
                && event.getRepeatCount() == 0) {            
            //具体的操作代码
        }
        return super.dispatchKeyEvent(event);
    }

---------------------------------------------------------------后续2012-8-23-----------------------------------------

如果仅仅是监听某个Activity的后退键,只需要覆写该方法即可.

    @Override
    public void onBackPressed() {
        super.onBackPressed();
    }

我们可以看看super.onBackPressed()方法默认的实现:

    /**
     * Called when the activity has detected the user's press of the back
     * key.  The default implementation simply finishes the current activity,
     * but you can override this to do whatever you want.
     */
    public void onBackPressed() {
        finish();
    }

如果想屏蔽后退键只需要把super.onBackPressed()方法注释即可

但是该方法不适用于TabActivity.

欢迎转载:http://blog.csdn.net/johnny901114/article/details/7822878