导读：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alertDil...
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"
