Android Question StartServiceAtExact not working

[FreemanHK]

I am now developing an app which requires a service that starts at exact time.

After testing the app on a HUAWEI Mate 20 X (Android 10), I found that the service was not always working.

StartServiceAtExact(Scount,NextTimeInstance(00, 00), True)

Sub SetExactAndAllowWhileIdle (Time As Long, ServiceName As String)
   Dim p As Phone
   If p.SdkVersion < 23 Then
     StartServiceAtExact(ServiceName, Time, True)
   Else
     Dim in As Intent
     in.Initialize("", "")
     in.SetComponent(Application.PackageName & "/." &  ServiceName.ToLowerCase)
     Dim jin As JavaObject = in
     jin.RunMethod("setAction", Array(Null))
     Dim ctxt As JavaObject
     ctxt.InitializeContext
     Dim am As JavaObject = ctxt.RunMethod("getSystemService", Array("alarm"))
     Dim pi As JavaObject
     pi = pi.InitializeStatic("android.app.PendingIntent").RunMethod("getService", _
  Array(ctxt, 1, in, 134217728))
     am.RunMethod("setExactAndAllowWhileIdle", Array(0, Time, pi))
   End If
End Sub

Code #1 did not work when the phone:
-was sleeping
-cleared all the apps using the

button
It sometimes worked when the app was open.
Code #2 did not work at all!

How can I start a service that ALWAYS WORKS at EXACT TIME?

Thanks!

 

[FreemanHK]

I compiled my app using SDK V.23 and android.jar V.23

 

[DonManfred]

I compiled my app using SDK V.23 and android.jar V.23

Sounds like a big mistake. You are probably using an outdated, deprecated, SDK.

B4A – The simple way to develop native Android apps

B4A includes all the features needed to quickly develop any type of Android app. B4A is used by tens of thousands of developers from all over the world, including companies such as NASA, HP, IBM and others.

www.b4x.com

Go over the installation instructions and carefully follow them and install it all new.

Per default B4A should use android.jar from api 28. Even targetsdk 28 should be set. But start with replacing your old SDK with a fresh one.

Do not use a SDK you are using with Android Studio oder any other Environment. Install a different SDK for B4X

 

[FreemanHK]

I have just compiled my app (SDK 28, android.jar 28, MIN SDK 28).

Unfortunately, It is still not working.

 

[FreemanHK]

The service cannot be activated if the device is sleeping.

 

[Erel]

1. You don't need to use this code. Use the built-in StartServiceAtExact keyword.

2. Not all devices will respect it and start your app exactly on time.

 

[KMatle]

Also check the energy savings options and if your app is allowed to run in the background (otherwise your app is fully stopped when the phone goes to sleep or the screen is turned off)

 

[FreemanHK]

After I enable the app to run in background ,
It worked!

Thanks!