dart

问题 How can I add a special character (e.g., copyright sign instead of (c)) in the following example: Widget copyrightText = new Container( padding: const EdgeInsets.only(left: 32.0, right: 32.0), child: Text('2018 (c) Author's Name'), ); 回答1: You can add it as unicode like child: new Text('2018 \u00a9 Author's Name'), or child: new Text('2018 © Author's Name'), See also How can I write a 3 byte unicode character as string literal 回答2: Only one other thing to add. Dart/Flutter add another concept

问题 How can I add a special character (e.g., copyright sign instead of (c)) in the following example: Widget copyrightText = new Container( padding: const EdgeInsets.only(left: 32.0, right: 32.0), child: Text('2018 (c) Author's Name'), ); 回答1: You can add it as unicode like child: new Text('2018 \u00a9 Author's Name'), or child: new Text('2018 © Author's Name'), See also How can I write a 3 byte unicode character as string literal 回答2: Only one other thing to add. Dart/Flutter add another concept

问题 Problem I need to solve Is there a way to get the class name of a dart class as a String or a Type object..? class MyClass { } var myClass = MyClass(); I know the property , runtimeType which return the type of the object as a Type object. But is there a similar function for classes? print(myClass.runtimeType.toString()); What I currently do is creating a object of the class and use runtimeType . String type = MyClass().runtimeType.toString(); Note: In python there is a variable called __name

问题 This is probably a noob question, but how do I make my response throw an exception if the user does not have an internet connection or if it takes too long to fetch the data? Future<TransactionModel> getDetailedTransaction(String crypto) async { //TODO Make it return an error if there is no internet or takes too long! http.Response response = await http.get(crypto); return parsedJson(response); } 回答1: You should surround it with try catch block, like so: import 'package:http/http.dart' as

问题 This is probably a noob question, but how do I make my response throw an exception if the user does not have an internet connection or if it takes too long to fetch the data? Future<TransactionModel> getDetailedTransaction(String crypto) async { //TODO Make it return an error if there is no internet or takes too long! http.Response response = await http.get(crypto); return parsedJson(response); } 回答1: You should surround it with try catch block, like so: import 'package:http/http.dart' as

问题 This is probably a noob question, but how do I make my response throw an exception if the user does not have an internet connection or if it takes too long to fetch the data? Future<TransactionModel> getDetailedTransaction(String crypto) async { //TODO Make it return an error if there is no internet or takes too long! http.Response response = await http.get(crypto); return parsedJson(response); } 回答1: You should surround it with try catch block, like so: import 'package:http/http.dart' as

问题 This is probably a noob question, but how do I make my response throw an exception if the user does not have an internet connection or if it takes too long to fetch the data? Future<TransactionModel> getDetailedTransaction(String crypto) async { //TODO Make it return an error if there is no internet or takes too long! http.Response response = await http.get(crypto); return parsedJson(response); } 回答1: You should surround it with try catch block, like so: import 'package:http/http.dart' as

问题 This is probably a noob question, but how do I make my response throw an exception if the user does not have an internet connection or if it takes too long to fetch the data? Future<TransactionModel> getDetailedTransaction(String crypto) async { //TODO Make it return an error if there is no internet or takes too long! http.Response response = await http.get(crypto); return parsedJson(response); } 回答1: You should surround it with try catch block, like so: import 'package:http/http.dart' as

问题 This is probably a noob question, but how do I make my response throw an exception if the user does not have an internet connection or if it takes too long to fetch the data? Future<TransactionModel> getDetailedTransaction(String crypto) async { //TODO Make it return an error if there is no internet or takes too long! http.Response response = await http.get(crypto); return parsedJson(response); } 回答1: You should surround it with try catch block, like so: import 'package:http/http.dart' as

问题 I'm using the Bloc pattern and have the following code to define my states: import 'package:meta/meta.dart' @immutable abstract class UiState {} class Loading extends UiState {} class Success extends UiState { Success(this.message); final String message; } class Failure extends UiState {} I try to use a UiState as follows: class MyWidget extends StatelessWidget { const MyWidget({ Key key, @required this.uiState, }) : super(key: key); final UiState uiState; Widget build(BuildContext context) {