import'dart:async';voidmain()async{Stringmessage="Two";varfutureValues=Future.value(message);print(futureValues);//Instance of '_Future<String>'print(futureValues.runtimeType);//_Future<String>} #Conclusion To summarize, We can easily convertStringtoFuture<String>andFuture<String>toStringwith exa...
import'package:flutter/material.dart';voidmain(){runApp(MyApp());}classMyAppextendsStatelessWidget{@override Widgetbuild(BuildContext context){returnMaterialApp(home:MyWeatherApp(),);}}classMyWeatherAppextendsStatelessWidget{// 模拟今日天气的数据final List<Map<String,dynamic>>weatherData=[{'title':'Tem...
AI代码解释 import'dart:async';import'dart:convert';import'package:flutter/foundation.dart';import'package:http/http.dart'ashttp;import'package:flutter_news/model/news.dart';classNewsApi{staticFuture<NewsList>getHeadLines({String category:"general",int page:0})async{final response=awaithttp.get("h...
import 'dart:io'; import 'dart:convert'; void main() { var file = File('large_file.txt'); var inputStream = file.openRead(); inputStream .transform(utf8.decoder) // 将字节解码为UTF-8 .transform(LineSplitter()) // 将流转换为单独的行 .listen((String line) { // 处理结果 print(...
创建一个虚拟的Future: Future<String?>_myFuture()async{awaitFuture.delayed(constDuration(seconds:10));return'Future completed';} 设置超时 3 秒: _myFuture().timeout(constDuration(seconds:3),onTimeout:()=>'The process took too much time to finish. Please try again later',); ...
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现在我们可以看到使用FutureBuilder的基本模式。在创建新的FutureBuilder对象时,我们将Future对象作为要处理的异步计算传递。 在构建器函数中,我们检查connectionState的值,并使用AsyncSnapshot中的数据或错误返回不同的窗口小部件。 FutureBuilder的使用? import'dart:convert'; ...
Future> queryAllDistrictsInCity(String cityid) async => DistrictModel.fromDistrictTableList(await _db.rawQuery( 'select district_id, district_name, weather_id from $_tableDistricts where city_id = ?', [cityid], )); /// 将所有的省插入数据库 Future insertProvinces(List provinces) async { ...
setMessageHandle((message) async { // 通过async修饰的方法 返回值为Future, 而此返回Future<String> print('message') // 这个消息来自于native, "Hello,I'm Android" setState(()=> { // 重绘之前搞事情 }); // 返回信息给客户端 return "To native" }) } // 步骤二:通过EC实例 注册了一个...
将http.Response 转换为 CommonModel 对象 : 需要使用 dart:convert 包 , 将 json 字符串转为 Map<String, dynamic> 类型数据 ; /// json 序列化 , 反序列化 包import 'dart:convert'; 然后将 Map<String, dynamic> 类型对象传入 CommonModel 类工厂方法 ;...