我正在尝试使用Flutter团队提供的Share软件包。我尝试实现该程序包，当该程序不起作用时，我尝试直接复制并粘贴其代码，但同样出现错误。不幸的是，该错误不是很有帮助，错误的描述为“我们需要更好地解释这一点”。有什么想法吗？
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();
// }
}
新错误回溯
[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)
答案 0 :(得分：1)
此行中的问题
namespace Cardinity.Infrastructure
{
using System.Security.Cryptography;
using System;
enum EncryptionMethods
{
None=0,
HMACSHA1,
HMACSHA256,
HMACSHA384,
HMACSHA512,
HMACMD5
}
internal class Protected
{
private Byte[] salt = Guid.NewGuid().ToByteArray();
protected byte[] Protect(byte[] data)
{
try
{
return ProtectedData.Protect(data, salt, DataProtectionScope.CurrentUser);
}
catch (CryptographicException)//no reason for hackers to know it failed
{
#if DEBUG
throw;
#else
return null;
#endif
}
}
protected byte[] Unprotect(byte[] data)
{
try
{
return ProtectedData.Unprotect(data, salt, DataProtectionScope.CurrentUser);
}
catch (CryptographicException)//no reason for hackers to know it failed
{
#if DEBUG
throw;
#else
return null;
#endif
}
}
}
internal class SecretKeySpec:Protected,IDisposable
{
readonly EncryptionMethods _method;
private byte[] _secretKey;
public SecretKeySpec(byte[] secretKey, EncryptionMethods encryptionMethod)
{
_secretKey = Protect(secretKey);
_method = encryptionMethod;
}
public EncryptionMethods Method => _method;
public byte[] SecretKey => Unprotect( _secretKey);
public void Dispose()
{
if (_secretKey == null)
return;
//overwrite array memory
for (int i = 0; i < _secretKey.Length; i++)
{
_secretKey[i] = 0;
}
//set-null
_secretKey = null;
}
~SecretKeySpec()
{
Dispose();
}
}
internal class Mac : Protected,IDisposable
{
byte[] rawHmac;
HMAC mac;
public Mac(SecretKeySpec key, string data)
{
switch (key.Method)
{
case EncryptionMethods.HMACMD5:
mac = new HMACMD5(key.SecretKey);
break;
case EncryptionMethods.HMACSHA512:
mac = new HMACSHA512(key.SecretKey);
break;
case EncryptionMethods.HMACSHA384:
mac = new HMACSHA384(key.SecretKey);
break;
case EncryptionMethods.HMACSHA256:
mac = new HMACSHA256(key.SecretKey);
break;
case EncryptionMethods.HMACSHA1:
mac = new HMACSHA1(key.SecretKey);
break;
default:
throw new NotSupportedException("not supported HMAC");
}
rawHmac = Protect( mac.ComputeHash(Cardinity.ENCODING.GetBytes(data)));
}
public string AsBase64()
{
return System.Convert.ToBase64String(Unprotect(rawHmac));
}
public void Dispose()
{
if (rawHmac != null)
{
//overwrite memory address
for (int i = 0; i < rawHmac.Length; i++)
{
rawHmac[i] = 0;
}
//release memory now
rawHmac = null;
}
mac?.Dispose();
mac = null;
}
~Mac()
{
Dispose();
}
}
}
右侧返回RenderSliverList，然后将其分配给RenderBox，以说明为什么存在不匹配类型。
您到底想分享什么？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。尝试下面的完整代码。可以。
RenderBox box = context.findRenderObject();
答案 1 :(得分：0)
万一仍然有人对此有疑问。这是对我有用的代码。
shareData(BuildContext context){
Share.share('Some text here',
subject: 'Update the coordinate!',
sharePositionOrigin: Rect.fromLTWH(left, top, width, height)
);
}