Android Question Using StartServiceAt

[Sergey_New]

I created an example using StartServiceAt. For simplicity, notification permission is set in the device settings. The notification should be generated at the set time.
Two questions:
1. How can I improve the accuracy of the notification time?
2. Why does a notification appear after rebooting the device or emulator, even though the set time has already passed.

Sub Process_Globals
    Private xui As XUI
     Public Start_Time As Long=10.00
End Sub

Sub Globals
    
End Sub

Sub Activity_Create(FirstTime As Boolean)
    Activity.LoadLayout("Layout")
    Dim nt As Long=setAlarm
    StartServiceAt(EveryDay, nt, False)
End Sub

Sub setAlarm As Long
    Dim t As Long=SetHours(Start_Time)
    Log(t)
    If t > DateTime.Now Then
        Return t
    End If
    Return DateTime.Add(t, 0, 0, 1)
End Sub

Sub SetHours(st As Double) As Long
    Dim hours As Int = Floor(st)
    Dim minutes As Int = Round(60 * (st - hours))
    Return DateUtils.SetDateAndTime(DateTime.GetYear(DateTime.Now), _
  DateTime.GetMonth(DateTime.Now), DateTime.GetDayOfMonth(DateTime.Now), hours, minutes, 0)
End Sub

#Region  Service Attributes
    #StartAtBoot: True
#End Region

Sub Process_Globals
    Dim nb As NB6
    Public event_count As Int
End Sub

Sub Service_Create
    Service.AutomaticForegroundmode = Service.AUTOMATIC_FOREGROUND_WHEN_NEEDED
End Sub

Sub Service_Start (StartingIntent As Intent)
    Dim ev As Int=1
    event_count=ev
    If ev<>0 Then
        Dim s As String=("Start Time" & " ") & Main.Start_Time & ":00"
        nb.Initialize("default", Application.LabelName, "DEFAULT").AutoCancel(True).SmallIcon(LoadBitmapResize(File.DirAssets, "icon.png", 24dip, 24dip, False))
        nb.ShowWhen(DateTime.Now)
        nb.Color(Colors.Blue)
        nb.Build(s, "", "tag1", Main).Notify(1)
    End If
    Service.StopAutomaticForeground
End Sub

Sub Service_Destroy
    
End Sub

Sub Service_TaskRemoved
    
End Sub

 

[Sergey_New]

It's been two weeks since I wrote this post.
Perhaps I phrased my question poorly.
What should I clarify in my question to make it clearer?
I have one more question.
3. Will I receive notifications if power saving mode is enabled?

 

[Erel]

Receivers and Services in 2023+

In the early days of Android services were simple to use and powerful. They allowed doing all kinds of things in the backgrounds with very few restrictions. That's not the case with newer versions of Android. With a few exceptions (that aren't 100% reliable), the only use case for services is to...

www.b4x.com

And if you want it to be exact: https://www.b4x.com/android/forum/threads/start-receiver-at-exact-time.148185/#content

 

[Sergey_New]

And if you want it to be exact:

Thanks!
This will work on Android 15 and android:targetSdkVersion="29"?

 

[Erel]

Yes.

 

[Sergey_New]

Yes

You told me that Start receiver at exact time would work on Android 15 and SdkVersion="29." I've been trying to implement this since then, but nothing works. Please help me with an example for B4A.

 

[Erel]

Provide more information. Post the relevant code and describe what happens.

Make sure to test it in release mode.

 

[Sergey_New]

Provide more information. Post the relevant code and describe what happens.

Make sure to test it in release mode.

I finally managed to rework the example for B4A. I've attached a working example. Unfortunately, after installing and uninstalling the app for the first time, the permission request doesn't appear. The permission remains. How can I fix this?

 

[MicroDrie]

Hi Sergey,
In the manifest manager you have <uses-sdk android:minSdkVersion="5" android:targetSdkVersion="29"/> and AddPermission(android.permission.SCHEDULE_EXACT_ALARM).
API level 29 = Android 10. The current B4A version uses API-35. In Android 12, Google introduced a new permission called "SCHEDULE_EXACT_ALARM" for API level 31 (Android 12) or higher and having this permission. Subsequently, with API-31 and AP-32, Google made additional changes to these restrictions. We do not know which Android versions you are targeting. You can read more at https://www.esper.io/blog/android-13-exact-alarm-api-restrictions.

 

[Sergey_New]

Unfortunately, after installing and uninstalling the app for the first time, the permission request doesn't appear.

I wrote it incorrectly. My example doesn't request permission for the alarm. It works without permission. I'd like the user to be able to choose whether to use the alarm or not. Please add the ability to receive the alarm request.