showdialog中的Navigator.push()不起作用

void showDialogWithNavigation(BuildContext context) {
  showDialog(
    context: context,
    builder: (BuildContext dialogContext) {
      return AlertDialog(
        title: Text('导航示例'),
        content: Text('点击按钮进行导航'),
        actions: <Widget>[
          TextButton(
            child: Text('导航'),
            onPressed: () {
              Navigator.pop(dialogContext); // 先关闭对话框
              Navigator.push(
                context,
                MaterialPageRoute(builder: (context) => SecondPage()),
              );
            },
          ),
        ],
      );
    },
  );
}

Future<void> asyncShowDialogWithNavigation(BuildContext context) async {
  await showDialog(
    context: context,
    builder: (BuildContext dialogContext) {
      return AlertDialog(
        title: Text('导航示例'),
        content: Text('点击按钮进行导航'),
        actions: <Widget>[
          TextButton(
            child: Text('导航'),
            onPressed: () {
              Navigator.pop(dialogContext);
              Navigator.push(
                context,
                MaterialPageRoute(builder: (context) => SecondPage()),
              );
            },
          ),
        ],
      );
    },
  );
}