小编Sam*_*der的帖子

我正在构建一个带有可关闭小部件、firebase 和 StreamBuilder 的 flutter 应用程序，并收到以下错误“已关闭的可关闭小部件仍然是树的一部分”。

请找到以下代码。

Expanded(
                  child: StreamBuilder(
                    stream: Firestore.instance
                        .document('/users/User1/Trips/${widget.tripId}')
                        .collection('TropDocs')
                        .snapshots(),
                    builder: (context, snapshot) {
                      if (!snapshot.hasData) return const Text("Loading....");
                      return ListView.builder(
                        itemExtent: 150.0,
                        itemCount: snapshot.data.documents.length,
                        itemBuilder: (context, index) {

final item = snapshot.data.documents[index];
                          final itemID =
                              snapshot.data.documents[index].documentID;
                          final list = snapshot.data.documents;      
return Dismissible(
   key: Key(itemID),
              // We also need to provide a function that tells our app
              // what to do after an item has been swiped away.
              onDismissed: (direction) {
                // Remove the item …