我的個人資料頁面中有以下代碼。該代碼在 android 中運行良好，但在 web 上，當我打開我的個人資料頁面時，它會顯示
意外的空值錯誤，
除錯控制臺中指向錯誤的代碼：
return Container(
child: StreamBuilder<DocumentSnapshot>(
stream: FirebaseFirestore.instance
.collection('users')
.doc(profileId)
.snapshots(),
builder: (context,snapshot) {
if (!snapshot.hasData) {
return Container(
alignment: FractionalOffset.center,
child: CircularProgressIndicator());
}
User user = User.fromDocument(snapshot.data!);
return Scaffold(
//all body widgets
);
除錯控制臺顯示
The following TypeErrorImpl was thrown building StreamBuilder<DocumentSnapshot<Object?>>(dirty, state: _StreamBuilderBaseState<DocumentSnapshot<Object?>, AsyncSnapshot<DocumentSnapshot<Object?>>>#556d2):
Unexpected null value.
The relevant error-causing widget was
StreamBuilder<DocumentSnapshot<Object?>>
lib/profile_page.dart:615
uj5u.com熱心網友回復：
我認為您應該將此行User user = User.fromDocument(snapshot.data!);放入else，如下所示：
if (!snapshot.hasData) { // if snapshot has no data this is going to run
return Container(
alignment: FractionalOffset.center,
child: CircularProgressIndicator());
}
else{ // if snapshot has data this is going to run
User user = User.fromDocument(snapshot.data!);
}
uj5u.com熱心網友回復：
檢查網路的 Firebase 權限
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標籤：火力基地 扑 谷歌云firestore 颤动网
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