ListValuesReset.dart

import 'package:flutter/material.dart';

class ChatConversationScreen extends StatefulWidget {
  @override
  _ChatConversationScreenState createState() => _ChatConversationScreenState();
}

class _ChatConversationScreenState extends State<ChatConversationScreen> {

  var currentAudioIndex = -1; //The index of the currently playing audio. By default it is -1

  var myAudioList = <AudioMessageClass>[
    AudioMessageClass(isPlaying: false, audioPath: "Path 1"),
    AudioMessageClass(isPlaying: false, audioPath: "Path 2"),
    AudioMessageClass(isPlaying: false, audioPath: "Path 3"),
    AudioMessageClass(isPlaying: false, audioPath: "Path 4"),
    AudioMessageClass(isPlaying: false, audioPath: "Path 5"),
  ];


  @override
  Widget build(BuildContext context) {

    //Make a duplicate of the myAudioList which will be used to reset the list later on the application
    var myStoppedAudioList = List
      .generate(
        myAudioList.length,
        (index) => (AudioMessageClass(
                      isPlaying: false,
                      audioPath: myAudioList[index].audioPath)
        )
    );

    return Scaffold(
      appBar: AppBar(),
      body: Column(
        children: [
          Text('Current Audio is:' + (currentAudioIndex == -1 ? "NOT PLAYING" : myAudioList[currentAudioIndex].audioPath)),
          Expanded(
            child: ListView.builder(
              itemCount: myAudioList.length,
              itemBuilder: (context, index){
                return Switch(value: myAudioList[index].isPlaying, onChanged: (val){
                  setState(() {
                    //This will clear the values of current list
                    myAudioList.setAll(0, myStoppedAudioList);
                    myAudioList[index].isPlaying = val;
                    currentAudioIndex = !val ? -1 : index;
                  });
                });
              }
            ),
          )
        ],
      ),
    );
  }
}

class AudioMessageClass{
  bool isPlaying;
  String audioPath;

  AudioMessageClass({this.isPlaying = false, this.audioPath});
}