playing music and iterating throug workout

lib/pages/interval_page.dart

@@ -170,10 +170,12 @@ class _IntervalTimerPageState extends State<IntervalTimerPage> {
 
   @override
   Widget build(BuildContext context) {
+    TimerProvider timerProvider = TimerProvider();
     return MultiProvider(
       providers: [
-        ChangeNotifierProvider(create: (context) => TimerProvider()),
-        ChangeNotifierProvider(create: (context) => WorkoutProvider())
+        ChangeNotifierProvider(create: (context) => timerProvider),
+        ChangeNotifierProvider(
+            create: (context) => WorkoutProvider(timerProvider))
       ],
       child: WorkoutTimerWidget(),
     );

lib/providers/timer_provider.dart

@@ -11,7 +11,6 @@ class TimerProvider extends ChangeNotifier {
     started = true;
     _timer = Timer.periodic(const Duration(seconds: 1), ((timer) {
       if (timer.tick >= duration.inSeconds) {
-        print(elapsedSeconds);
         timer.cancel();
         started = false;
       }

lib/providers/workout_provider.dart

@@ -1,6 +1,16 @@
+import 'dart:async';
+
+import 'package:audioplayers/audioplayers.dart';
 import 'package:flutter/material.dart';
+import 'package:smoke_cess_app/providers/timer_provider.dart';
 
 class WorkoutProvider extends ChangeNotifier {
+  TimerProvider timerProvider;
+
+  final AudioPlayer _audioPlayer = AudioPlayer();
+
+  WorkoutProvider(this.timerProvider);
+
   final List<String> _workoutPhases = [
     'Warm-Up',
     'High Intensity',
@@ -18,6 +28,12 @@ class WorkoutProvider extends ChangeNotifier {
     'Low Intensity': const Duration(seconds: 3),
     'Cool-down': const Duration(seconds: 5)
   };
+  final Map<String, Source> _phaseSongSources = {
+    'Warm-Up': AssetSource('warmUp.mp3'),
+    'High Intensity': AssetSource('workout.mp3'),
+    'Low Intensity': AssetSource('workout.mp3'),
+    'Cool-down': AssetSource('cool_down.mp3')
+  };
   int _workoutPhaseIndex = 0;
 
   String get currentPhase => _workoutPhases[_workoutPhaseIndex];
@@ -25,9 +41,11 @@ class WorkoutProvider extends ChangeNotifier {
       _phasesDuration[currentPhase] ?? const Duration(seconds: 0);
 
   void nextPhase() {
-    _workoutPhaseIndex < _workoutPhases.length
-        ? _workoutPhaseIndex += 1
-        : _workoutPhaseIndex = 0;
-    //notifyListeners();
+    _audioPlayer.stop();
+    if (_workoutPhaseIndex < _workoutPhases.length - 1) {
+      _workoutPhaseIndex += 1;
+      _audioPlayer.play(_phaseSongSources[currentPhase]!);
+      timerProvider.startTimer(currentPhaseDuration);
+    }
   }
 }

lib/widgets/workout_timer_widget.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import 'package:smoke_cess_app/providers/workout_provider.dart';
@@ -15,9 +17,7 @@ class WorkoutTimerWidget extends StatelessWidget {
 
     if (timerProvider.elapsedSeconds ==
         workoutProvider.currentPhaseDuration.inSeconds) {
-      print('Timer abgelaufen');
-      workoutProvider.nextPhase();
-      timerProvider.startTimer(workoutProvider.currentPhaseDuration);
+      Timer(const Duration(milliseconds: 1), () => workoutProvider.nextPhase());
     }
 
     return Column(