textspan 转连接

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import 'package:flutter/material.dart'; import 'package:flutter/gestures.dart'; import 'package:url_launcher/url_launcher.dart'; import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';   class TestApp extends StatelessWidget {     @override   Widget build(BuildContext context) {     // TODO: implement build     return Scaffold(       appBar: AppBar(         title: Text('test'),       ),       body: Center(child:Container(         child: RichText(             text: TextSpan(               children: [                 TextSpan(                     text: 'just test',                     style: TextStyle(color: Colors.black),                   recognizer: TapGestureRecognizer()..onTap=()=>Navigator.of(context).push(MaterialPageRoute(builder: (_){                     return WebTest();                   })),                 ),               ],             ),         ),       )),       floatingActionButton: FloatingActionButton(           onPressed: (){             Navigator.of(context).pushNamed('/web');           },       ),     );   } }     class WebTest extends StatelessWidget { //  WebTest({this.url});   final String url = 'http://www.v2ex.com';     @override   Widget build(BuildContext context) {   print('press here');     return WebviewScaffold(       appBar: AppBar(title: Text('test'),),       url: url,     );   } }   class _LinkTextSpan extends TextSpan {     // Beware!   //   // This class is only safe because the TapGestureRecognizer is not   // given a deadline and therefore never allocates any resources.   //   // In any other situation -- setting a deadline, using any of the less trivial   // recognizers, etc -- you would have to manage the gesture recognizer's   // lifetime and call dispose() when the TextSpan was no longer being rendered.   //   // Since TextSpan itself is @immutable, this means that you would have to   // manage the recognizer from outside the TextSpan, e.g. in the State of a   // stateful widget that then hands the recognizer to the TextSpan. //  example: //  _LinkTextSpan( //      style: linkStyle, //      url: 'https://goo.gl/iv1p4G', //      text: 'flutter github repo', //  ),     _LinkTextSpan({ TextStyle style, String url, String text }) : super(       style: style, //      text: str ?? url,     text:text,       recognizer: TapGestureRecognizer()..onTap = () {         print('tapped');         return WebviewScaffold(           url:url,           appBar: AppBar(             title: Text(text, style:TextStyle(color: Colors.red)),           ),         );       }   ); }