Error in flutter : <asynchronous suspension>
1,259
Found this answer (not mine):
is not an indication of a problem, it just indicates that code execution is not synchronous code executed line-by-line, but instead a callback from a completed Future started at some position in the callstack
Author by
Deepak
Updated on December 30, 2022Comments
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Deepak over 1 year
I want to show a dialog box after product add successfully but when I clicking on Add To Cart Button then I am getting that type of error which is in image.
This dialog box want to show using httpException, in product_detailpage.dart page where i use this httpExcetion there are i use dotted line.
This is my cart_api.dart pageimport 'dart:convert'; import 'package:hospital/CartPage/Cart_Api/cart_http_exception.dart'; import 'package:hospital/customApiVariable.dart'; import 'package:http/http.dart' as http; Future add_to_cart_fn( String quantity, String plistId, String uid, String sid) async { var url = Uri.parse( '$ecommerceBaseUrl/addToCartApi.php?a2rTokenKey=$a2rTokenKey&action=addToCart&uid=60daaedd3b9f8751161'); print('add_to_cart_url:' + url.toString()); final response = await http.post(url, headers: { "Accept": "Application/json" }, body: { "quantity": quantity, "plistId": plistId, "uid": uid, "sid": sid, }); print("ae" + response.body); final convertderDatatoJson = jsonDecode(response.body); try { if (convertderDatatoJson['status'] == "true") { print('status' + convertderDatatoJson['status']); print('msg' + convertderDatatoJson['msg']); throw HttpException(convertderDatatoJson['msg']); } } catch (e) { throw e; } return convertderDatatoJson; }this is my httpException.dart page
class HttpException implements Exception { final msg; HttpException(this.msg); @override String toString() { // TODO: implement toString return msg; } }This is my product_detailPage.dart page,
import 'dart:convert'; import 'package:carousel_pro/carousel_pro.dart'; import 'package:flutter/material.dart'; import 'package:hospital/CartPage/Cart_Api/cart_api.dart'; import 'package:hospital/CartPage/Cart_Api/cart_http_exception.dart'; import 'package:hospital/CartPage/pages/cartPage.dart'; import 'package:hospital/Drawer/dropdown_menu.dart'; import 'package:hospital/ProductDetailsPage/product_detailPage.dart'; import 'package:hospital/ProductDetailsPage/related_product_page.dart'; import 'package:hospital/SecondSection/Medicine/medicine_page.dart'; import 'package:hospital/constant.dart'; import 'package:hospital/customApiVariable.dart'; import 'package:http/http.dart' as http; import 'package:line_icons/line_icons.dart'; import 'package:provider/provider.dart'; class DetailPage extends StatefulWidget { final plistId; const DetailPage({Key key, this.plistId}) : super(key: key); @override _DetailPageState createState() => _DetailPageState(); } class _DetailPageState extends State<DetailPage> { final GlobalKey<FormState> _formKey = GlobalKey(); int quantity = 1; var response; var detailPageApi; @override void initState() { super.initState(); fetchData(widget.plistId); } fetchData(var consultWithDoctor) async { a2rTokenKey=carpet1234'); var api = Uri.parse( '$ecommerceBaseUrl/productListApi.php?a2rTokenKey=$a2rTokenKey&plistId=${widget.plistId}'); response = await http.get( api, ); print("detailPageApi " + api.toString()); print("detailPageBody " + response.body); // in double quotes drink is key value of json detailPageApi = jsonDecode(response.body); print("detailPagelist " + detailPageApi.toString()); // return doctorDetailsApi; setState(() {}); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( backgroundColor: kGreen, title: Text( "Details", style: TextStyle(fontStyle: FontStyle.italic), ), actions: [ IconButton( icon: Icon(Icons.shopping_cart), // onPressed: () => print("open cart"), onPressed: () { Navigator.push( context, MaterialPageRoute(builder: (context) => Cartpage()), ); }, ), DropDownMenu(), ], ), body: Container( child: response != null ? ListView.builder( // itemCount: categoryApi.length.clamp(0, 3),//THis is for showed minimun length of item listview.builder flutter itemCount: detailPageApi.length.clamp(0, 1), scrollDirection: Axis.vertical, physics: ScrollPhysics(), shrinkWrap: true, itemBuilder: (context, index) { var details = detailPageApi[index]; if (details['num'] == 0) { return Center( child: CircularProgressIndicator( backgroundColor: Colors.white, ), ); } return Column( children: <Widget>[ Hero( tag: "1", child: SizedBox( height: 300.0, width: 300.0, child: Carousel( boxFit: BoxFit.cover, autoplay: false, animationCurve: Curves.fastOutSlowIn, animationDuration: Duration(milliseconds: 800), dotSize: 6.0, dotIncreasedColor: Colors.black, dotBgColor: Colors.transparent, // dotPosition: DotPosition.topRight, dotVerticalPadding: 10.0, showIndicator: true, indicatorBgPadding: 7.0, images: [ NetworkImage(details['pImgImg']), ], ), ), ), SizedBox( height: 50, ), Padding( padding: const EdgeInsets.only(left: 20, right: 20), child: Row( crossAxisAlignment: CrossAxisAlignment.start, children: <Widget>[ Text( "Name :", style: TextStyle( fontSize: 18, height: 1.5, fontWeight: FontWeight.w500), ), SizedBox( width: 20, ), Flexible( child: Text( // widget.details, details['productName'], style: TextStyle( fontSize: 17, height: 1.5, fontWeight: FontWeight.w500), ), ), ], ), ), SizedBox( height: 20, ), Padding( padding: const EdgeInsets.only(left: 20, right: 20), child: Row( crossAxisAlignment: CrossAxisAlignment.start, children: <Widget>[ Text( "Details :", style: TextStyle( fontSize: 18, height: 1.5, fontWeight: FontWeight.w500), ), SizedBox( width: 20, ), Flexible( child: Text( // widget.details, details['productDescription'], style: TextStyle( fontSize: 17, height: 1.5, fontWeight: FontWeight.w500), ), ), ], ), ), SizedBox( height: 20, ), Padding( padding: const EdgeInsets.only(left: 20, right: 20), child: Row( children: <Widget>[ Text( "Price :", style: TextStyle( fontSize: 18, fontWeight: FontWeight.w500), ), SizedBox( width: 20, ), Row( children: <Widget>[ Text( // "Rs " + widget.pPromotionPrice, "Rs 55.0", style: TextStyle( fontSize: 17, fontWeight: FontWeight.w500), ), SizedBox( width: 20, ), Text( // "Rs " + widget.pPrice, "Rs 100", style: TextStyle( fontSize: 18, fontWeight: FontWeight.w500, // color: warning, decoration: TextDecoration.lineThrough), ) ], ) ], ), ), SizedBox( height: 25, ), Padding( padding: const EdgeInsets.only(right: 20, left: 20), child: Row( children: <Widget>[ Text( "Qty :", style: TextStyle( fontSize: 17, fontWeight: FontWeight.w500), ), SizedBox( width: 20, ), Row( children: <Widget>[ InkWell( onTap: () { if (quantity > 1) { setState(() { quantity = --quantity; }); } // minus here }, child: Container( width: 25, height: 25, decoration: BoxDecoration( // border: Border.all(color: primary), shape: BoxShape.circle), child: Icon( LineIcons.minus, size: 15, ), ), ), SizedBox( width: 15, ), Text( quantity.toString(), style: TextStyle(fontSize: 16), ), SizedBox( width: 15, ), InkWell( onTap: () { setState(() { quantity = ++quantity; }); // minus here }, child: Container( width: 25, height: 25, decoration: BoxDecoration( // border: Border.all(color: primary), shape: BoxShape.circle), child: Icon( LineIcons.plus, size: 15, ), ), ), ], ) ], ), ), SizedBox( height: 50, ), InkWell( onTap: () async { --------------------------------------------- //here show my msg using dialog box try {} on HttpException catch (e) { print('hiii'); var errorMessage = 'Authentication Failed'; if (e.toString().contains( 'Product Succesfully Added to Cart')) { errorMessage = 'Product Succesfully Added to Cart'; print(errorMessage); _showerrorDialog(errorMessage); } } catch (error) { var errorMessage = 'Please try again later'; _showerrorDialog(errorMessage); } ------------------------------------------------ var qty = quantity.toString(); var plistId = widget.plistId; print('pplistid' + plistId); var uid = var_uid.toString(); var sid = var_sid.toString(); print('uuid' + uid); print('ssid' + sid); var response = await add_to_cart_fn(qty, plistId, uid, sid); print("rsp: " + response['status']); }, // }, child: Padding( padding: EdgeInsets.only(left: 20, right: 20), child: Container( height: 45, width: double.infinity, decoration: BoxDecoration( color: kGreen, borderRadius: BorderRadius.circular(30)), child: Center( child: Text( "ADD TO CART", style: TextStyle( color: kWhite, fontSize: 20, ), ), ), ), ), ), SizedBox(height: 20.0), // SomeMedicinePage(), RelatedProductPage(plistId: widget.plistId) ], ); }) : Center( child: CircularProgressIndicator( backgroundColor: Colors.white, ), ), ), ); } void _showerrorDialog(String message) { showDialog( context: context, builder: (ctx) => AlertDialog( title: Text( 'An Error Occurs', style: TextStyle(color: Colors.blue), ), content: Text(message), actions: <Widget>[ FlatButton( child: Text('Okay'), onPressed: () => Navigator.of(context, rootNavigator: true).pop()) ], ), ); } }