我有一个按钮,按下它会将某些东西插入到数据库中并将用户重定向到另一个页面。我正试图实现 FutureBuilder
,它应该在一切完成之前显示 CircularProgressIndicator
。
这是我的函数:
Future<bool> insertPhoneNumber(String phoneNumber) async {
String token = await getToken();
if (token.isNotEmpty) {
var body = jsonEncode({'token': token, 'userID': user.getUserID(), 'phoneNumber': phoneNumber});
print(body.toString());
var res = await http.post((baseUrl + "/insertPhoneNumber/" + user.getUserID()),
body: body,
headers: {
"Accept": "application/json",
"content-type": "application/json"
});
if (res.statusCode == 200) {
print("Insert Phone Number is OK");
notifyListeners();
return true;
} else {
print("Insert Phone Number not OK");
notifyListeners();
return false;
}
} else {
print("Insert Phone Number failed due to unexisting token");
}
}
这是一个触发数据库交互的按钮:
RaisedButton(
color: Color.fromRGBO(105, 79, 150, 1),
onPressed: () {
var user = Provider.of<UserRepository>(context);
String completePhoneNumber = _selectedDialogCountry.phoneCode + phoneNumberController.text;
FutureBuilder(
future: user.insertPhoneNumber(completePhoneNumber),
builder: (BuildContext context, AsyncSnapshot snapshot) {
if (snapshot.connectionState != ConnectionState.done) {
return CircularProgressIndicator(
backgroundColor: Colors.blue);
} else {
return Dashboard();
}
},
);
},
textColor: Colors.white,
child: Text("SAVE"),
)
它更新了数据库,但没有其他任何反应。没有进度指示器,也没有重定向到Dashboard
。
编辑
这是我的完整构建方法:
@override
Widget build(BuildContext context) {
return Scaffold(
body: Container(
padding: EdgeInsets.all(8.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
AutoSizeText(
'What is your phone number?',
style: TextStyle(fontSize: 30),
maxLines: 1,
),
Row(
children: <Widget>[
SizedBox(
width: 9.0,
child: Icon(Icons.arrow_downward),
),
SizedBox(width: 8.0),
SizedBox(
width: 120.0,
height: 65.0,
child: Card(
child: ListTile(
onTap: _openCountryPickerDialog,
title: _buildDialogItem(_selectedDialogCountry),
),
)),
Expanded(
child: TextField(
autofocus: true,
keyboardType: TextInputType.number,
decoration:
InputDecoration(border: OutlineInputBorder())),
),
],
),
SizedBox(
width: 100,
child: RaisedButton(
color: Color.fromRGBO(105, 79, 150, 1),
onPressed: () {
print("Test");
},
textColor: Colors.white,
child: Text("SAVE"),
),
)
],
)),
);
}
build
方法。这是一个简单的PhoneNumber
类和build
在PhoneNumberState
类内部。 - harunB10