我正在尝试使用 Flutter 团队提供的 Share 包。我尝试实现该包，当它不起作用时，我尝试直接复制和粘贴他们的代码，但同样出现错误。不幸的是，这个错误不是很有帮助，错误的描述说“我们需要更好地解释这个”。有任何想法吗？
我的代码：
FlatButton(
child: Text(
'Share',
style: TextStyle(
color: Color.fromRGBO(245, 93, 62, 1.0)),
),
color: Colors.grey[100],
onPressed: () {
final RenderBox box = context.findRenderObject();
Share.share('Hello this is a test',
sharePositionOrigin:
box.localToGlobal(Offset.zero) &
box.size);
},
),
错误：
flutter: The following assertion was thrown while handling a gesture:
flutter: type 'RenderSliverList' is not a subtype of type 'RenderBox'
flutter:
flutter: Either the assertion indicates an error in the framework itself, or we should provide substantially
flutter: more information in this error message to help you determine and fix the underlying cause.
flutter: In either case, please report this assertion by filing a bug on GitHub:
flutter: https://github.com/flutter/flutter/issues/new?template=BUG.md
flutter:
flutter: When the exception was thrown, this was the stack:
flutter: #0 _EverythingState._buildEventCards.<anonymous closure> (package:loopt_in/widgets/everything.dart:175:43)
flutter: #1 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:507:14)
flutter: #2 _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:562:30)
flutter: #3 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24)
flutter: #4 TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:242:9)
flutter: #5 TapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:204:7)
flutter: #6 GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:156:27)
flutter: #7 _WidgetsFlutterBinding&BindingBase&GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:184:20)
flutter: #8 _WidgetsFlutterBinding&BindingBase&GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:158:22)
flutter: #9 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:138:7)
flutter: #10 _WidgetsFlutterBinding&BindingBase&GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:101:7)
flutter: #11 _WidgetsFlutterBinding&BindingBase&GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:85:7)
flutter: #12 _invoke1 (dart:ui/hooks.dart:165:13)
flutter: #13 _dispatchPointerDataPacket (dart:ui/hooks.dart:119:5)
flutter: Handler: onTap
flutter: Recognizer:
flutter: TapGestureRecognizer#ecc56(debugOwner: GestureDetector, state: ready, won arena, finalPosition:
flutter: Offset(196.0, 747.5), sent tap down)
更新
import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';
import 'package:share/share.dart';
class Everything extends StatefulWidget {
@override
State<StatefulWidget> createState() {
// TODO: implement createState
return _EverythingState();
}
}
class _EverythingState extends State<Everything> {
Widget _buildEventCards(BuildContext context, DocumentSnapshot document) {
var width = MediaQuery.of(context).size.width;
return Container(
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 14.0),
child: Card(
elevation: 0.0,
child: Column(
children: <Widget>[
Image.asset(
document['image'],
fit: BoxFit.cover,
),
Container(
padding: EdgeInsets.symmetric(vertical: 15.0, horizontal: 20.0),
child: Column(
children: <Widget>[
SizedBox(
height: 15.0,
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
// Icon(document['icon']),
],
),
],
),
SizedBox(
height: 10.0,
),
Wrap(
direction: Axis.horizontal,
alignment: WrapAlignment.start,
runAlignment: WrapAlignment.start,
children: <Widget>[
Chip(
backgroundColor: Colors.grey[100],
label: Text(
document['date'],
),
),
SizedBox(
width: 10.0,
),
Chip(
backgroundColor: Colors.grey[100],
label: Text(document['source']),
),
SizedBox(
width: 10.0,
),
Chip(
backgroundColor: Colors.grey[100],
label: Text(
document['location'],
),
),
],
),
SizedBox(
height: 15.0,
),
Container(
width: width,
child: Text(
document['title'],
style: TextStyle(fontSize: 24.0),
),
),
SizedBox(
height: 20.0,
),
Text(document['desc']),
SizedBox(
height: 20.0,
),
Row(
children: <Widget>[
FlatButton(
child: Text(
'More',
style: TextStyle(
color: Color.fromRGBO(118, 190, 208, 1.0)),
),
color: Colors.grey[100],
onPressed: () {
print('webview clicked');
Navigator.of(context).push(
MaterialPageRoute(
builder: (context) => WebviewScaffold(
url: document['url'],
appBar: AppBar(
title: Text(document['source']),
backgroundColor: Color.fromRGBO(
135,
142,
136,
1.0,
),
),
),
),
);
},
),
SizedBox(
width: 15.0,
),
FlatButton(
child: Text(
'Share',
style: TextStyle(
color: Color.fromRGBO(245, 93, 62, 1.0)),
),
color: Colors.grey[100],
onPressed: () {
final RenderBox box = context.findRenderObject();
Share.share('Hello this is a test',
sharePositionOrigin:
box.localToGlobal(Offset.zero) &
box.size);
},
),
],
),
],
),
),
],
),
),
);
}
@override
Widget build(BuildContext context) {
return StreamBuilder(
stream: Firestore.instance.collection('stories').snapshots(),
builder: (context, snapshot) {
if (!snapshot.hasData) return const Text('Loading...');
return ListView.builder(
itemCount: snapshot.data.documents.length,
itemBuilder: (context, index) =>
_buildEventCards(context, snapshot.data.documents[index]),
);
});
}
// @override
// void initState() {
// // TODO: implement initState
// super.initState();
// FirebaseAdMob.instance.initialize(appId: FirebaseAdMob.testAppId);
// var bannerAd = _buildBanner()..load();
// }
}
新的错误追溯
[VERBOSE-2:shell.cc(184)] Dart Error: Unhandled exception:
MissingPluginException(No implementation found for method share on channel plugins.flutter.io/share)
#0 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:291:7)
<asynchronous suspension>
#1 Share.share (package:share/share.dart:44:20)
#2 ShareButton.build.<anonymous closure> (package:loopt_in/widgets/everything.dart:220:17)
#3 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:507:14)
#4 _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:562:30)
#5 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:102:24)
#6 TapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:242:9)
这一行的问题
RenderBox box = context.findRenderObject();
右侧返回 RenderSliverList 并将其分配给 RenderBox，这就是为什么存在不匹配类型的原因。
你到底想分享什么？所以我可以帮忙
编辑：
您需要将共享按钮提取到其自己的小部件中。试试下面的完整代码。有用。
import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';
import 'package:share/share.dart';
class Everything extends StatefulWidget {
@override
State<StatefulWidget> createState() {
// TODO: implement createState
return _EverythingState();
}
}
class _EverythingState extends State<Everything> {
Widget _buildEventCards(BuildContext context, DocumentSnapshot document) {
var width = MediaQuery.of(context).size.width;
return Container(
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 14.0),
child: Card(
elevation: 0.0,
child: Column(
children: <Widget>[
Image.asset(
document['image'],
fit: BoxFit.cover,
),
Container(
padding: EdgeInsets.symmetric(vertical: 15.0, horizontal: 20.0),
child: Column(
children: <Widget>[
SizedBox(
height: 15.0,
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
// Icon(document['icon']),
],
),
],
),
SizedBox(
height: 10.0,
),
Wrap(
direction: Axis.horizontal,
alignment: WrapAlignment.start,
runAlignment: WrapAlignment.start,
children: <Widget>[
Chip(
backgroundColor: Colors.grey[100],
label: Text(
document['date'],
),
),
SizedBox(
width: 10.0,
),
Chip(
backgroundColor: Colors.grey[100],
label: Text(document['source']),
),
SizedBox(
width: 10.0,
),
Chip(
backgroundColor: Colors.grey[100],
label: Text(
document['location'],
),
),
],
),
SizedBox(
height: 15.0,
),
Container(
width: width,
child: Text(
document['title'],
style: TextStyle(fontSize: 24.0),
),
),
SizedBox(
height: 20.0,
),
Text(document['desc']),
SizedBox(
height: 20.0,
),
Row(
children: <Widget>[
FlatButton(
child: Text(
'More',
style: TextStyle(
color: Color.fromRGBO(118, 190, 208, 1.0)),
),
color: Colors.grey[100],
onPressed: () {
print('webview clicked');
Navigator.of(context).push(
MaterialPageRoute(
builder: (context) => WebviewScaffold(
url: document['url'],
appBar: AppBar(
title: Text(document['source']),
backgroundColor: Color.fromRGBO(
135,
142,
136,
1.0,
),
),
),
),
);
},
),
SizedBox(
width: 15.0,
),
new MyButton(),
],
),
],
),
),
],
),
),
);
}
@override
Widget build(BuildContext context) {
return StreamBuilder(
stream: Firestore.instance.collection('stories').snapshots(),
builder: (context, snapshot) {
if (!snapshot.hasData) return const Text('Loading...');
return ListView.builder(
itemCount: snapshot.data.documents.length,
itemBuilder: (context, index) =>
_buildEventCards(context, snapshot.data.documents[index]),
);
});
}
// @override
// void initState() {
// // TODO: implement initState
// super.initState();
// FirebaseAdMob.instance.initialize(appId: FirebaseAdMob.testAppId);
// var bannerAd = _buildBanner()..load();
// }
}
class MyButton extends StatelessWidget {
const MyButton({
Key key,
}) : super(key: key);
@override
Widget build(BuildContext context) {
return FlatButton(
child: Text(
'Share',
style: TextStyle(
color: Color.fromRGBO(245, 93, 62, 1.0)),
),
color: Colors.grey[100],
onPressed: () {
final RenderBox box = context.findRenderObject();
Share.share('Hello this is a test',
sharePositionOrigin:
box.localToGlobal(Offset.zero) &
box.size);
},
);
}
}
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