我对Flutter和Dart非常陌生，所以我试图构建一个简单的搜索应用程序，基于Flutters showSearch搜索栏中键入的单词进行查询。我理解listtile是为了向用户显示建议而构建的，点击该建议将激活buildresults小部件。但是，我想启用键盘上的搜索按钮，以简单地搜索输入的单词，而不是点击有限的建议列表。Simple android keyboard
当正常单击按钮时，键盘关闭，buildresults不会激活。到目前为止，你必须真正点击一个建议的列表选项。有没有办法让键盘上的搜索按钮搜索输入的文本？或者用户是否仅限于建议的列表选项？我将在下面列出我的showSearch代表：

class StockDelegate extends SearchDelegate<String> {
  final stocks = [
    "IBM",
    "NKLAW",
    "DKNGZ",
    "DRD",
    "PRTS",
    "TSLA",
    "KIRK",
    "VBIV"
  ];
  final suggested = ["IBM", "TSLA", "BNTX"];

  @override
  // TODO: implement textInputAction

  // TODO: implement textInputAction
  TextInputAction get textInputAction => super.textInputAction;

  @override
  List<Widget> buildActions(BuildContext context) {
    //actions for app bar
    StockProvider _stockProvider =
        Provider.of<StockProvider>(context, listen: true);
    return [
      IconButton(
          icon: Icon(Icons.clear),
          onPressed: () {
            query = '';
          }),
    ];
  }

  @override
  Widget buildLeading(BuildContext context) {
    //Leading icon on the left of the app bar
    return IconButton(
        icon: AnimatedIcon(
          icon: AnimatedIcons.menu_arrow,
          progress: transitionAnimation,
        ),
        onPressed: () {
          close(context, null);
        });
  }

  @override
  Widget buildResults(BuildContext context) {
    //build results code 
   
  }

  @override
  Widget buildSuggestions(BuildContext context) {
    // show when someone search for something
    stocks.insert(0, query.toString());

    final suggestionList = query.isEmpty
        ? suggested
        : stocks.where((p) => p.startsWith(query)).toList();

    return ListView.builder(
      itemCount: suggestionList.length,
      itemBuilder: (context, index) => ListTile(
        onTap: () async {
          Provider.of<StockProvider>(context, listen: false)
              .searchBySymbol(suggestionList[index]);

          if (!stocks.contains(suggestionList[index]))
            suggestionList.add(suggestionList[index]);

          showResults(context);
        },
        leading: Icon(Icons.attach_money),
        title: Text(suggestionList[index]),
      ),
    );
  }