Dart 无法通过Flatter应用打开浏览器URL
我正在制作一个新闻应用程序,它显示一个新闻列表,其中包含标题、描述和源网站的url。 这是我的newsDetail.dart页面Dart 无法通过Flatter应用打开浏览器URL,dart,flutter,unhandled-exception,flutter-dependencies,Dart,Flutter,Unhandled Exception,Flutter Dependencies,我正在制作一个新闻应用程序,它显示一个新闻列表,其中包含标题、描述和源网站的url。 这是我的newsDetail.dart页面 import 'package:flutter/material.dart'; import 'package:scoped_model/scoped_model.dart'; import 'package:url_launcher/url_launcher.dart'; import '../scoped_models/main.dart'; import '.
import 'package:flutter/material.dart';
import 'package:scoped_model/scoped_model.dart';
import 'package:url_launcher/url_launcher.dart';
import '../scoped_models/main.dart';
import '../models/news.dart';
class NewsDetailPage extends StatelessWidget {
_launchURL(String url) async {
String url1 = url;
if (await canLaunch(url1)) {
await launch(url1);
} else {
throw 'Could not launch $url1';
}
}
@override
Widget build(BuildContext context) {
// TODO: implement build
return ScopedModelDescendant<MainModel>(
builder: (BuildContext context, Widget child, MainModel model) {
return WillPopScope(
onWillPop: () {
print('back button presses');
Navigator.pop(context, false);
return Future.value(false);
},
child: ScopedModelDescendant<MainModel>(
builder: (BuildContext context, Widget child, MainModel model) {
final News news = model.allnews[model.selectedIndex];
print('news details main');
print(news);
return Scaffold(
appBar: AppBar(
title: Text(news.title),
),
body: Column(
children: <Widget>[
Container(
padding: EdgeInsets.all(20.0),
child: Text(
news.description,
style: TextStyle(
fontSize: 20.0,
),
),
),
Center(
child: FlatButton(
onPressed: (){
_launchURL(news.url);
},
child: Text('further details'),
),
),
],
),
);
}),
);
},
);
}
}
news.url是一个字符串,其中包含选定新闻的url。我已经在_launchURL方法中传递了url。此方法是此链接的精确副本:
但每当我点击那个按钮时,它就会给我一个错误:
[ERROR:flutter/shell/common/shell.cc(186)] Dart Error: Unhandled exception:
E/flutter ( 5959): MissingPluginException(No implementation found for method canLaunch on channel plugins.flutter.io/url_launcher)
E/flutter ( 5959): #0 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:291:7)
E/flutter ( 5959): <asynchronous suspension>
E/flutter ( 5959): #1 canLaunch (package:url_launcher/url_launcher.dart:111:25)
E/flutter ( 5959): <asynchronous suspension>
E/flutter ( 5959): #2 NewsDetailPage._launchURL (package:project/widgets/newsdetail.dart:12:15)
E/flutter ( 5959): <asynchronous suspension>
E/flutter ( 5959): #3 NewsDetailPage.build.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:project/widgets/newsdetail.dart:52:25)
E/flutter ( 5959): #4 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:507:14)
E/flutter ( 5959): #5 _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:562:30)
E/flutter ( 5959): #6 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24)
E/flutter ( 5959): #7 TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:242:9)
E/flutter ( 5959): #8 TapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:175:7)
E/flutter ( 5959): #9 PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:315:9)
E/flutter ( 5959): #10 PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:73:12)
E/flutter ( 5959): #11 PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:101:11)
E/flutter ( 5959): #12 _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:180:19)
E/flutter ( 5959): #13 _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:158:22)
E/flutter ( 5959): #14 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:138:7)
E/flutter ( 5959): #15 _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:101:7)
E/flutter ( 5959): #16 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:85:7)
E/flutter ( 5959): #17 _invoke1 (dart:ui/hooks.dart:173:13)
E/flutter ( 5959): #18 _dispatchPointerDataPacket (dart:ui/hooks.dart:127:5)
我有url_启动器:^5.0.2
已安装在py pubspec.yaml文件中。请告诉我是什么错误,以及解决方案。尝试使用函数launch。没有“等待” 希望它能起作用 只是:启动尝试重新启动应用程序。
不是热重启或热重新加载;完全重启我删除了应用程序,重新安装在android上
launchURL() async {
const url = 'https://flutter.dev';
if (await canLaunch(url)) {
await launch(url,
forceSafariVC: true,
enableJavaScript: true,);
} else {
throw 'Could not launch $url';
}
}
再一次尝试更新yamltried中的依赖项,不起作用,这与我的SDK版本有关吗?这对我来说很有效!有人能解释一下原因吗?