Question Music Sleep Timer function: I need the timer to run out onApplicationPause.

Hi All,
I could really use some help. I'm updating an android app i've made and I want to add a sleep timer function for users to fall asleep to audio.
I've got my audio able to run in background using Android Native Audio plugin.
But I just can't get the timer to work out of focus or on pause. I don't need to keep track of the time I just need it to run out. I've tried a few variations of co-routines but still getting nowhere.
Here is my working script:

Code (CSharp):

1.  
2. using UnityEngine;
3. using UnityEngine.UI;
4.  
5. public class CountdownTimer : MonoBehaviour
6. {
7.     public float timeRemaining = 60;
8.     public Slider slider;
9.     public Text TimerText;
10.     public Text RunningTimer;
11.     public bool timerIsRunning;
12.  
13.  
14.     private void Start()
15.     {
16.         timerIsRunning = false;
17.     }
18.     void Update()
19.     {
20.  
21.         if (timerIsRunning)
22.         {
23.             slider.value = timeRemaining;
24.             if (timeRemaining > 0)
25.             {
26.                 timeRemaining -= Time.deltaTime;
27.                 DisplayTime(timeRemaining);
28.             }
29.             else
30.             {
31.                 timeRemaining = 0;
32.                 timerIsRunning = false;
33.                 GameObject.Find("AUDIOPANEL").GetComponent<TestAudioManager>().StopAudio();
34.             }
35.         }
36.     }
37.     //I'm not sure what to do with the update method when i'm trying to use onapplicationpause/focus....please help.
38.     public void DisplayTime(float DisplayTime)
39.     {
40.         DisplayTime += 1;
41.  
42.         float minutes = Mathf.FloorToInt(DisplayTime / 60);
43.         float seconds = Mathf.FloorToInt(DisplayTime % 60);
44.  
45.         TimerText.text = string.Format("{0:00}:{1:00}", minutes, seconds);
46.         RunningTimer.text = string.Format("{0:00}:{1:00}", minutes, seconds);
47.     }
48.  
49.     public void SetTime(float value)
50.     {
51.         string sliderMessage = Mathf.Round(slider.value / 60) + ":00";
52.         TimerText.text = sliderMessage;
53.         RunningTimer.text = sliderMessage;
54.     }
55.     public void StartTimer()
56.     {
57.         timerIsRunning = true;
58.         timeRemaining = slider.value;
59.     }
60.  
61.     public void StopTimer()
62.     {
63.         timerIsRunning = false;
64.     }
65. }

 

Kind of like the solution above, I'm pretty sure you need to implement some sort of Android-side timer that persists and can do stuff while your app isn't in focus. I don't have direct experience with these background modes in Android but obviously they are possible.

 

I was afraid of that I had a hard enough time getting the Audio to work. *sigh.
Thanks for your quick reply

 

For posterity: This asset gave me an elegant solution -
https://assetstore.unity.com/packages/tools/integration/task-invoker-mobile-background-tasks-165472

Thank you @Vuopaja for your assistance getting it implemented.