Activity has leaked window that was originally added 问题解决

在做练习的时候，切换屏幕竖恒状态时，会出现Activity has leaked window that was originally added 错误。网上查询得知原因是因为alertDilaog没有关闭所造成的。有2种解决方案：

1)：

    @Override
protected void onPause() 
{
super.onPause();
        //关闭对话框
AlertDialog.dismiss();
}

2):

 AndroidManifest.xml  中给相应的<Activity>节点添加android:configChanges="orientation|keyboardHidden|navigation"