Flutter 省道/颤振：在没有上下文的页面之间导航（使用导航器）（因此没有导航器。推？）

在我的应用程序中，我有6个不同的页面。 有一个名为“收藏夹页面”的页面，其中列出了用户选择的收藏夹。它们由一列显示，该列使用另一个类的列表。名单编号如下：

  List<Widget> favoriteContainerLists() {
    DatabaseProvider.db.queryDb();
    List<Widget> localList = [];
    if (DatabaseProvider.publicFavoriteList == null ||
        DatabaseProvider.publicFavoriteList.isEmpty) {
      localList.add(
        Column(
          crossAxisAlignment: CrossAxisAlignment.center,
          children: [
            Text(
              "Hier erscheinen deine Favoriten!",
              style: TextStyle(
                fontFamily: "Hind",
                fontSize: 22,
              ),
            ),
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Text(
                  "Makiere Bilder auf der Informationsseite mit ",
                  style: TextStyle(
                    color: Colors.indigo,
                    fontFamily: "Hind",
                    fontSize: 15,
                  ),
                ),
                Icon(
                  Icons.star_border,
                  color: Colors.orange,
                ),
              ],
            ),
            Text(
              " um sie hinzuzufügen!",
              style: TextStyle(
                color: Colors.indigo,
                fontFamily: "Hind",
                fontSize: 15,
              ),
            ),
          ],
        ),
      );
    } else {
      localList.add(Padding(
        padding: const EdgeInsets.only(bottom: 15.0),
        child: Text(
          "Deine Favoriten:",
          textAlign: TextAlign.left,
          style: TextStyle(
            fontSize: 30,
            color: Colors.indigoAccent,
            fontFamily: "Hind",
          ),
        ),
      ));
      for (var i = 0; i < DatabaseProvider.publicFavoriteList.length; i++) {
        DatabaseProvider.db.queryDb();
        int currentIdInt = DatabaseProvider.publicFavoriteList[i];
        localList.add(
          Padding(
            padding: const EdgeInsets.only(bottom: 15),
            child: MaterialButton(
              onPressed: ***null***,
              padding: const EdgeInsets.only(bottom: 0),
              child: Container(
                width: double.infinity,
                height: 120,
                decoration: BoxDecoration(
                  color: buttonColor,
                  borderRadius: BorderRadius.only(
                      topLeft: Radius.circular(8),
                      topRight: Radius.circular(8),
                      bottomLeft: Radius.circular(8),
                      bottomRight: Radius.circular(8)),
                  boxShadow: [
                    BoxShadow(
                      color: Colors.grey.withOpacity(0.5),
                      spreadRadius: 5,
                      blurRadius: 7,
                      offset: Offset(0, 3), // changes position of shadow
                    ),
                  ],
                ),
                child: Padding(
                  padding: const EdgeInsets.fromLTRB(10, 8, 10, 8),
                  child: Row(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Center(
                        child: Container(
                          width: 70,
                          decoration: BoxDecoration(
                            borderRadius: BorderRadius.only(
                                topLeft: Radius.circular(8),
                                topRight: Radius.circular(8),
                                bottomLeft: Radius.circular(8),
                                bottomRight: Radius.circular(8)),
                          ),
                          child: Image.asset(
                              AppBrain().contentList[currentIdInt].imageAdress),
                        ),
                      ),
                      VerticalDivider(
                        thickness: 2,
                        indent: 15,
                        endIndent: 15,
                      ),
                      Expanded(
                        child: Column(
                          crossAxisAlignment: CrossAxisAlignment.start,
                          mainAxisAlignment: MainAxisAlignment.start,
                          children: [
                            Text(
                              AppBrain().contentList[currentIdInt].artName,
                              style: TextStyle(
                                  fontFamily: "Hind",
                                  fontSize: 23,
                                  color: Colors.blueGrey),
                            ),
                            Expanded(
                              child: Container(
                                child: RichText(
                                  maxLines: 2,
                                  softWrap: true,
                                  overflow: TextOverflow.ellipsis,
                                  textAlign: TextAlign.left,
                                  text: TextSpan(
                                    style: TextStyle(
                                        fontSize: 14,
                                        color: Colors.black,
                                        fontFamily: "Hind"),
                                    text:
                                        (contentList[currentIdInt].description),
                                  ),
                                ),
                              ),
                            )
                          ],
                        ),
                      ),
                    ],
                  ),
                ),
              ),
            ),
          ),
        );
      }
    }
    return localList;
  }

它们位于两个不同的类中。包含该列表的类没有BuildContext，也应该有非BuildContext。理想情况下，当它说

onTap:null时，

此时我希望它是空的

Navigator.of(context).push(
     toInformationPage(),
                          ); 

---

但我知道我不能使用任何需要上下文的东西。有什么想法吗？

您可以使用GlobalKey作为导航器。已经有很多文章介绍了如何实现这一点，这里是另一个选项，即将FavoriteContainerList包装到单个小部件（可能是包装它的列）中，并使用构建函数。所以你可能会有这样的想法：

class FavoriteContainerList extends StatelessWidget {
    @override
    Widget build(BuildContext context) {
      return Column(
        child: The logic from AppBrain().favoriteContainerLists() here.

这说服我出于其他原因使用类，但获取上下文也很好

class FavoriteContainerList extends StatelessWidget {
    @override
    Widget build(BuildContext context) {
      return Column(
        child: The logic from AppBrain().favoriteContainerLists() here.