问题描述
大家好，我正在开发一个聊天应用程序，我在 graphql Flutter 中遇到订阅问题，我在查询（消息）中看不到更新数据（新消息）的方法，有人能告诉我是什么吗？我的代码丢失了。
我已经尝试过我的代码，但它会显示一个 CircularProgressIndicator，直到接收者向发送者发送消息。
这是我的代码
Widget build(BuildContext context) {
return
Subscription(
options: Subscriptionoptions(
document: gql(onNewChatMessage),variables: {'chatroom': MyApp.deviceid}),builder: (result) {
if (result.hasException) {
return Text(result.exception.toString());
}
if (result.isLoading) {
return Center(
child: CircularProgressIndicator(),);
}
var newMessage = result.data['onNewChatMessage'];
//print(newMessage);
Query(
options: QueryOptions(
document: gql(myMessagesQuery),variables: {
'userName': MyApp.username,'deviceid': MyApp.deviceid
},// pollInterval: 10,),builder: (QueryResult result,{VoidCallback refetch,FetchMore fetchMore}) {
_refetch = refetch;
if (result.hasException) {
return Text(result.exception.toString());
}
if (result.isLoading) {
return Center(
child: CircularProgressIndicator(),);
}
scrollToBottom();
List messages = result.data['myMessages'];
if (newMessage['sender'] != MyApp.username)
messages.add({
'createdAt': newMessage['createdAt'],'receiver': newMessage['receiver'],'sender': newMessage['sender'],'message': newMessage['text']
});
//print(messages);
return
GestureDetector(
onTap: () {
FocusScope.of(context).unfocus();
},child:
Column(
children: [
Expanded(
child: Container(
decoration: Boxdecoration(
color: Colors.white,borderRadius: BorderRadius.only(
topLeft: Radius.circular(30.0),topRight: Radius.circular(30.0),child: ClipRRect(
borderRadius: BorderRadius.only(
topLeft: Radius.circular(30.0),child: ListView.builder(
controller: _scrollController,padding: EdgeInsets.only(top: 15.0),itemCount: messages.length,itemBuilder: (context,index) {
final message = messages[index];
DateTime date =
DateTime.parse(message['createdAt']);
return Container(
padding: EdgeInsets.only(
left: 16,right: 16,top: 10,bottom: 10),child: Align(
alignment:
(message['sender'] == MyApp.username
? Alignment.topRight
: Alignment.topLeft),child: Container(
decoration: Boxdecoration(
borderRadius:
BorderRadius.circular(20),color: (message['sender'] ==
MyApp.username
? Colors.blue[200]
: Colors.grey.shade200),padding: EdgeInsets.all(16),child: Container(
width: message['message'].length >
10 ||
message['sender'].length >
10
? 200
: 80,child: message['sender'] !=
MyApp.username
? Column(
children: [
Align(
alignment:
Alignment.topLeft,child: Text(
'~${message['sender']}',style: TextStyle(
fontWeight:
FontWeight
.bold),)),SizedBox(height: 5),Align(
alignment:
Alignment.topLeft,child: Text(
message['message'],style: TextStyle(
fontSize: 15),Align(
alignment: Alignment
.bottomright,//child:
//Text(DateFormat.yMEd().format(date),child: Text(
DateFormat.Hm()
.format(date)
//DateFormat.yMEd().format(date)
),)
],)
: Column(
children: [
Align(
alignment:
Alignment.topLeft,//child: Text(DateFormat.yMEd().format(date),child: Text(
DateFormat.Hm()
.format(date)),);
}),Container(
padding:
EdgeInsets.only(left: 10,bottom: 10,top: 10),height: 60,width: double.infinity,color: Colors.white,child: Row(
children: [
GestureDetector(
//onTap: _showNotification,child: Container(
height: 30,width: 30,decoration: Boxdecoration(
color: Theme.of(context).primaryColor,borderRadius: BorderRadius.circular(30),child: Icon(
Icons.chat_bubble,size: 20,SizedBox(width: 15),Expanded(
child: TextField(
onTap: () {
MyApp.username != null
? //print('hh')
scrollToBottom()
: showDialog(
context: context,builder: (BuildContext context) =>
//buttonbarTheme to align dialog button
buttonbarTheme(
data: buttonbarThemeData(
alignment:
MainAxisAlignment
.center),child: AlertDialog(
content:
SingleChildScrollView(
child: Column(
children: [
Text(getTranslated(
context,'username_request_title')),FormBuilderTextField(
onTap: () {
showDialog(
context:
context,builder: (BuildContext
context) =>
//buttonbarTheme to align dialog button
buttonbarTheme(
data:
buttonbarThemeData(alignment: MainAxisAlignment.center),child: AlertDialog(
content: Text(
getTranslated(context,'username_save_message'),textAlign: TextAlign.center,actions: [
MaterialButton(
onpressed: () {
Navigator.of(context).pop(false);
},child: Text(getTranslated(context,'okay_btn')),]),));
},name: 'name',decoration: Inputdecoration(
labelText:
getTranslated(
context,'username_label')),onChanged: (val) {
scrollToBottom();
MyApp.username =
val;
},validator:
FormBuilderValidators
.compose(
[
FormBuilderValidators
.required(
context),],textInputAction:
TextInputAction
.done,actions: [
MaterialButton(
onpressed: () async {
prefs =
await SharedPreferences
.getInstance();
setState(() {
prefs.setString(
'username',MyApp
.username);
MyApp.username =
prefs.getString(
'username');
});
Navigator.of(
context)
.pop(false);
},child: Text(
getTranslated(
context,'save_btn')),));
},textAlignVertical: TextAlignVertical.center,textCapitalization:
TextCapitalization.sentences,decoration: Inputdecoration.collapsed(
hintText: getTranslated(
context,'message_placeholder'),hintStyle:
TextStyle(color: Colors.black54),border: InputBorder.none),controller: _textController,keyboardType: TextInputType.multiline,maxLines: null,Mutation(
options: Mutationoptions(
document: gql(sendChatMessage),update: (cache,result) {
return cache;
},onCompleted: (dynamic resultData) async {
List errors =
resultData['sendMessage']['errors'];
if (errors == null || errors.isEmpty) {
if (MyApp.deviceid == '' ||
MyApp.deviceid == null) {
prefs = await SharedPreferences
.getInstance();
setState(() {
MyApp.deviceid =
resultData['sendMessage']
['message']['deviceid'];
prefs.setString(
'deviceid',MyApp.deviceid);
MyApp.deviceid =
prefs.getString('deviceid');
});
}
_refetch();
} else {
for (int i = 0;
i < errors.length;
i++) {
setState(() {
field = errors[i]['field'];
error = errors[i]['message'];
});
}
if (field == 'sender_username') {
print(error);
showDialog(
barrierdismissible: false,context: context,builder: (BuildContext context) =>
buttonbarTheme(
data: buttonbarThemeData(
alignment:
MainAxisAlignment
.center),child: AlertDialog(
content: Text(
error,textAlign:
TextAlign.center,actions: [
MaterialButton(
onpressed: () {
prefs.remove(
'username');
setState(() {
MyApp.username =
null;
MyApp.deviceid =
null;
});
FocusScope.of(
context)
.unfocus();
Navigator.of(
context)
.pop(false);
},child: Text(
getTranslated(
context,));
}
print(errors);
}
}),builder: (RunMutation runMutation,QueryResult result) {
return result.isLoading
? Container(
width: 25,height: 25,margin: EdgeInsets.only(right: 15),child: CircularProgressIndicator(),)
: FloatingActionButton(
onpressed: () {
var text =
_textController.text.trim();
setState(() {
formData = {
'deviceid': MyApp.deviceid,'senderUsername':
MyApp.username,'message': text
};
});
if (text != '')
runMutation({'input': formData});
_textController.clear();
scrollToBottom();
},child: Icon(
Icons.send,size: 18,backgroundColor:
Theme.of(context).primaryColor,elevation: 0,);
},)
],)
],));
// }
// )
});
//});
解决方法
暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！
如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。
小编邮箱:dio#foxmail.com (将#修改为@）