Android Question Timers in Services

Reinierus · Jun 11, 2014

Hello.
I have a service with a timer at 1000 (1 second). The event of the timer stores data in a local database. But in the data I see records no always in a second, for example, every 10 seconds, 30 seconds. This is part of my code:

B4X:

Sub Service_Create
Timer1.Initialize("Timer1", 1000)
    Timer1.Enabled = True
End Sub

B4X:

Sub Timer1_Tick
If vrGrabaDatos=True Then
        vrSQL.ExecNonQuery("INSERT INTO Estadisticas VALUES(NULL, '" & vrLatitud & "' , '" & vrLatitudDiff & "' , '" & vrLongitud & " ', '" & vrLongitudDiff & "' , " & vrVelocidadKM & "," & vrDistanciaKM & ", '" & DateTime.Date(DateTime.Now) & "','" & DateTime.Time(DateTime.Now) & "')")
    End If
End Sub

And the result in the database "Estadisticas" is (the "DateTime.Time(DateTime.Now)" field):

18:14:01
18:14:02
18:14:03
18:14:04
18:14:06
18:14:27
18:14:28
18:14:29
18:14:50
18:14:56
18:14:57
18:15:17
18:15:18
18:15:19
18:15:28
18:15:29
18:15:30
18:15:31
18:15:32
18:15:36
18:15:37

Note the jumps in the data

Thanks a lot

DonManfred · Jun 11, 2014

vrGrabaDatos seems to be false when the timer tick event starts. So no db-entry is written in this sub...
Check why vrGrabaDatos is false at this place.

You can put log-commands to log the time the timer tick is called to know whether the timer runs correctly...

Reinierus · Jun 11, 2014

Hello DonManfred.
vrGrabaDatos is always in "True" for record the data. It is the signal to start recording and, when is "False", it stops recording. If vrGrabaDatos is "False", there is not data at all.

Any other idea?

Best regards

DonManfred · Jun 11, 2014

like i wrote... Put log´s inside the sub to SEE the sub is working every second (or even not)... If there are unexpected gaps then you should search about infos why the timer is not running every second...

Reinierus · Jun 11, 2014

Ok DonManfred.
I will do that

Thanks a lot

DonManfred · Jun 12, 2014

You also can use StartServiceAt to reshedule the service one minute later... The service will start again at the given time

Reinierus · Jun 12, 2014

Thanks DonManfred.
I believe that the service is not responding because on it is also running the GPS events. I think is better to use a different service only for the timer. I will try it and let you know.

Best regards

Reinierus · Jun 13, 2014

Hello DonManfred
I tried with another service, but I got the same result, so I will try with PhoneWakeState, first with PartialLock and, if doesn't work, with KeepAlive. I will let you know.

Thanks

merlin2049er · Sep 19, 2014

I need to do the same thing.

Reinierus · Sep 22, 2014

Hello Merlin.
I tried with PhoneWakeState PartialLock and works fine. I don't need to make the screen always visible.

Best regards

merlin2049er · Sep 22, 2014

Ok, I'd need to start the service at every say 30 seconds (maybe user definable) and then insert records into a table and / or update the dashboard.

Reinierus · Sep 22, 2014

I will need to see your code, but as you say, I think you need one service with a timer running every 30 seconds and makes it to record and/or the update. When the service is not recording or updating, it can be waiting.

To make the phone always awake:

B4X:

'In Globals
Dim phoneDespierto As PhoneWakeState

'In Activity_Create
phoneDespierto.Partiallock

'In the end app button or end sub
phoneDespierto.ReleasePartialLock

PD. Sorry for my bad English

merlin2049er · Sep 22, 2014

Np, your english is great. I believe i'm doing that, plus i've got the sticky service in the manifest.

Reinierus · Sep 22, 2014

Thanks (and thanks to Google traslator). So, what is wrong with your program?. What is not doing?

merlin2049er · Sep 22, 2014

oh, haven't figured out the timer services just yet. I'll look at it in detail soon.

DonManfred · Sep 22, 2014

It´s up to you to make the time between defineable... See an simple service-example
when started it runs every 5 seconds and log a randum number...

B4X:

Sub Service_Start (StartingIntent As Intent)
    Log(DateTime.Time(DateTime.Now)&": Service_Start")
    ' Do what ever you need to do here. Insert things into db, whatever
    Dim r As Int = Rnd(100,200)
    Log(DateTime.Time(DateTime.Now)&": random="&r)
   
    StartServiceAt("", DateTime.Now + 5 * 1000, False)
    StopService("")
End Sub

Reinierus · Sep 22, 2014

Ok, I hope that helps.

merlin2049er · Sep 22, 2014

Thanks, that will be really helpful. I've got a dashboard in my main activity, can I call it from the timer or do I need to move that to the service. I wasn't too sure about this, I guess I can try it both ways.

Reinierus · Sep 22, 2014

The dashboard is a group of views? I believe you cannot load views from services. If I need to show services variables in views, I put a timer in the activity and the variable in the Process_Globals on the service, so, every short time the activity (timer) ask for that variable and show it. I don't know if there is a best way to do that, but works for me.
I don´t know if I understand you well.

merlin2049er · Sep 23, 2014

My dashboard is one panel in the main activity that's going to monitor 5 variables, and a button which enables / disables the timer service.

So, hopefully in the timer service I can set it to recreate the service every 30 seconds or so, and read the bluetooth variables and populat the dashboard and insert the variables into a table.

Android Question Timers in Services

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