fix onlisten stream error

lib/providers/workout_provider.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:audioplayers/audioplayers.dart';
 import 'package:flutter/material.dart';
 import 'package:smoke_cess_app/models/workout.dart';
@@ -8,9 +10,11 @@ class WorkoutProvider extends ChangeNotifier {
   TimerProvider timerProvider;
 
   final AudioPlayer _audioPlayer = AudioPlayer();
+  late StreamSubscription _onCompleteSubscription;
   final Source _finishedSoundSource = AssetSource('finish.mp3');
   final Source _beepSoundSource = AssetSource('beep.mp3');
   bool isWorkoutStarted = false;
+  bool isWorkoutComplete = false;
   bool isMuted = false;
   int motivationBefore = 50;
   int motivationAfter = 50;
@@ -50,18 +54,19 @@ class WorkoutProvider extends ChangeNotifier {
   Color get currentPhaseColor => _workoutPhaseSettings[currentPhase]!['color'];
   AssetSource get currentPhaseSource =>
       _workoutPhaseSettings[currentPhase]!['source'];
-  bool get isWorkoutComplete =>
-      _workoutPhaseIndex == _workoutPhases.length - 1 && isPhaseComplete;
+  /* bool get isWorkoutComplete =>
+      _workoutPhaseIndex == _workoutPhases.length - 1 && isPhaseComplete; */
 
   void nextPhase() {
+    _onCompleteSubscription.cancel();
     _audioPlayer.stop();
     if (_workoutPhaseIndex < _workoutPhases.length - 1) {
       _audioPlayer.play(_beepSoundSource);
       _workoutPhaseIndex += 1;
-      _audioPlayer.onPlayerComplete.listen((event) {
+      _onCompleteSubscription = _audioPlayer.onPlayerComplete.listen((event) {
         _audioPlayer.play(currentPhaseSource);
-        timerProvider.startTimer(currentPhaseDuration);
       });
+      timerProvider.startTimer(currentPhaseDuration);
     } else {
       //workout completed
       _audioPlayer.play(_finishedSoundSource);
@@ -71,19 +76,20 @@ class WorkoutProvider extends ChangeNotifier {
 
   void startWorkout() {
     isWorkoutStarted = true;
-    _audioPlayer.play(_beepSoundSource);
-    _audioPlayer.onPlayerComplete.listen((event) {
+    isWorkoutComplete = false;
+    _audioPlayer.play(_beepSoundSource).whenComplete(() => null);
+    _onCompleteSubscription = _audioPlayer.onPlayerComplete.listen((event) {
       _audioPlayer.play(currentPhaseSource);
-      timerProvider.startTimer(currentPhaseDuration);
     });
+    timerProvider.startTimer(currentPhaseDuration);
   }
 
   void stopWorkout() {
     isWorkoutStarted = false;
-    //_workoutPhaseIndex = 0;
+    isWorkoutComplete = true;
     _audioPlayer.stop();
     timerProvider.stopTimer();
-    notifyListeners();
+    //notifyListeners();
   }
 
   void saveWorkout() {

lib/widgets/workout_timer_widget.dart

@@ -16,7 +16,7 @@ class WorkoutTimerWidget extends StatelessWidget {
     TimerProvider timerProvider = context.watch<TimerProvider>();
     WorkoutProvider workoutProvider = context.watch<WorkoutProvider>();
 
-    if (workoutProvider.isPhaseComplete && workoutProvider.isWorkoutStarted) {
+    if (workoutProvider.isPhaseComplete && !workoutProvider.isWorkoutComplete) {
       Timer(const Duration(milliseconds: 1), () => workoutProvider.nextPhase());
     }
 
@@ -36,10 +36,6 @@ class WorkoutTimerWidget extends StatelessWidget {
       }
     }
 
-    if (workoutProvider.isWorkoutComplete) {
-      handleStartStopWorkout();
-    }
-
     return Column(
       mainAxisAlignment: MainAxisAlignment.center,
       children: [