[FIXED] Deleting an item from ListView.builder in Flutter

Issue

I am trying to implement a function to delete the selected item from the list on long press after confirmation from the user to delete ('Yes' button and 'No' button). I am using Inkwell.

I tried a few various ways but couldn't find anything.

One similar post I found but it was not useful.

Note: I don't want to use Dismissable

Here is the code: -

import 'package:flutter/material.dart';
import 'package:smoorapplication/src/services/api.dart';
import 'package:percent_indicator/percent_indicator.dart';

class BodyFunctionCard extends StatefulWidget{
  const BodyFunctionCard({Key key}) : super(key: key);
  @override
  _BodyFunctionCardHPState createState() => _BodyFunctionCardHPState();
}

class _BodyFunctionCardHPState extends State<BodyFunctionCard>{
  List<bool> isExpanded = List.generate(100, (index) => false);
  List<bool> isAccepted = List.generate(100,(index) => false);
  List<bool> isPicked = List.generate(100,(index) => false);
  List<bool> isArrived = List.generate(100,(index) => false);
  List<bool> isDelRet = List.generate(100,(index) => false);
  List<bool> isFinished = List.generate(100,(index) => false);
  List<bool> countfin = List.generate(100,(index) => false);
  List<double> lpind = List.generate(100, (index) => 0.0);
  @override
  Widget build(BuildContext context){
    return Card(
        child: FutureBuilder(
          future: apiGetOrder(),
          builder: (BuildContext context, AsyncSnapshot snapshot){
              if(snapshot.connectionState == ConnectionState.none || snapshot.hasData == null){
                return const Center(child:
                Text('Loading data . . . !'),);
              }return ListView.builder(
                  itemCount: snapshot.data.length,
                  itemBuilder: (BuildContext context, int index) {
                return Column(
                  children: <Widget>[
                    InkWell(child:
                    Container(
                      height: 200,
                      width: 380,
                      margin: const EdgeInsets.all(0.0),
                      decoration: BoxDecoration(
                        border: Border.all(width: 1.5, color: Colors.grey),
                      ),
                      child: Column(children: <Widget>[
                        const SizedBox(height: 3.5,),
                        Container(
                          height: 30,
                          width: 370,
                          color: const Color.fromRGBO(220,220,220,2.0),
                          child: Row(children: <Widget>[
                            Text('  ${snapshot.data[index].orderNumber}', style: const TextStyle(fontSize: 16, fontWeight: FontWeight.bold),),
                            const SizedBox(width: 130,),
                            LinearPercentIndicator(
                              width: 100,
                              lineHeight: 15,
                              percent: lpind[index],
                              backgroundColor: Colors.orange,
                              progressColor: Colors.lightGreen,
                            ),
                            const SizedBox(width: 10,),
                            Text('  ${snapshot.data[index].orderNumber}', style: const TextStyle(fontSize: 16, fontWeight: FontWeight.bold),)
                          ],),
                        ),
                        const SizedBox(height: 10,),
                        Row(children: <Widget>[
                          RichText(text: const TextSpan(
                              children: [
                                WidgetSpan(
                                    child: Padding(padding: EdgeInsets.symmetric(horizontal: 10.0),child: Icon(Icons.circle, color: Colors.orange, size: 18,),)
                                )
                              ]
                          )),
                          const Text('PICKUP LOCATION', style: TextStyle(fontSize: 16),)
                        ],),
                        const SizedBox(height: 5,),
                        Row(children: <Widget>[
                          Text('        ${snapshot.data[index].lineItems[0].originLocation.name} ${snapshot.data[index].lineItems[0].originLocation.address1}',
                            style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 16),
                          )
                        ],),
                        Row(children: <Widget>[
                          Text('        ${snapshot.data[index].lineItems[0].originLocation.address2}',
                            style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 16),
                          )
                        ],),
                        const SizedBox(height: 10,),
                        Row(children: <Widget>[
                          RichText(text: const TextSpan(
                              children: [
                                WidgetSpan(
                                    child: Padding(padding: EdgeInsets.symmetric(horizontal: 10.0),child: Icon(Icons.circle, color: Colors.lightGreen, size: 18,),)
                                )
                              ]
                          )),
                          const Text('DELIVERY LOCATION', style: TextStyle(fontSize: 16),)
                        ],),
                        const SizedBox(height: 5,),
                        Row(children: <Widget>[
                          Text('        ${snapshot.data[index].lineItems[0].originLocation.name} ${snapshot.data[index].lineItems[0].originLocation.address1}',
                            style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 16),
                          )
                        ],),
                        Row(children: <Widget>[
                          Text('        ${snapshot.data[index].lineItems[0].originLocation.address2}',
                            style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 16),
                          )
                        ],)
                      ],),
                    ),
                      onTap: (){
                        setState(() {
                          isExpanded[index] = !isExpanded[index];
                        });
                      },
                      onLongPress: (){
                        setState(() {
                          // I want to delete the item at the current index.
                        });
                      },
                    ),
                    const SizedBox(height: 10,),
                  ],
                );
            }
          );
        }
      ),
    );
  }
}

I am new to Flutter, I will help others when I gain some knowledge.

Solution

STEP 1:FIND THE INDEX Of PARTICULAR OBJECT(element) VIA

Your_List_Name.indexOf(Your_List_Name[index]);

ex:_userData.indexOf(_userData[index]) 

Step 2:REMOVE THE OBJECT AT PARTICULAR INDEX

Your_LIST_Name.removeAt(index);

ex: _userData.removeAt(index);

According your code data is your list name

Answered By - Anmol Mishra