Android Question How to close aplication properly

[Arturs]

In my aplication I have service module and three activities.

In service module I detect whether bluetooth module is on.
If user or another aplication turns off BT (when my aplication is running on). My aplication should be closed as well.

I wonder what should be closed at the beginning.
service module or aplication.


It is my code to detect if BT was turned off

Sub admin_StateChanged (NewState As Int, OldState As Int)



If (IsPaused(Main) = False Or IsPaused(Parameters) = False Or IsPaused(calibration)=False) And (NewState = admin.STATE_OFF)  Then

    Common.connected = False
    Log ("BT off")

what should be here ?

End If

End Sub

 

[Roycefer]

If you're showing an Activity at that time, you can close that Activity. If you have scheduled Service starts, you can cancel them. You shouldn't try to end the process; that is the OS's job.

 

[Arturs]

The apliacation should be closed only when one of them is showed. In another case it does not matter.

My service module works all the time Service.StartForeground(0,Null)

so only Add ExitAplication in service module ?

 

[Roycefer]

Erel recommends against using

ExitApplication

Instead, try calling

Activity.Finish

from inside the active Activity and

Service.StopForeground(0) 'or whatever your Notification ID is

from inside the Service. This will allow the OS to kill your process when it wants.

 

[Arturs]

For example current Activity is not Main but another.

and in admin_State .... I have the following code

Sub admin_StateChanged (NewState As Int, OldState As Int)

If (IsPaused(Main) = False Or IsPaused(Parameters) = False Or IsPaused(calibration)=False) And (NewState = admin.STATE_OFF)  Then


    Common.connected = False
    Log ("Off")
    Service.StopForeground(0)
    CallSub(another,"Finish")
   
   
End If

End Sub

and in another activity I have

Sub Finish
   
    Activity.finish
   
End Sub

The current Activity will be finished and my aplication returns to Main Activity - the aplication will not be closed

 

[lemonisdead]

the aplication will not be closed

So you would have to call a sub inside the Main activity which will finish it too when the UserClosed is True in the current activity

 

[Arturs]

Now. Everything is clear but I have another problem

Why My service starts 2 times

Sub Service_Start (StartingIntent As Intent)
              
End Sub

In debug mode I watch that aplication goes into the above SUB 2 times

 

[Erel]

Service_Start can be called multiple times. Service_Create will only be called once (unless you stop the service).

 

[Arturs]

I call service start only once in Activity_Create

If FirstTime = True Then            
        StartService(BT)   
Sub

but In log windows I observe that the servicestart was called two times. It is only place where I call ServiceStart

second problem

I have read the article https://www.b4x.com/android/forum/threads/service-modules.7542/ and I analyzed example codes but I still
do not know difference between ServiceStart/Stop which is Activity Create and ServiceStart/Stop.foreground.


It seems that ServiceStart in Activity Create only start service but without specific mode or default

but Service.StartForeground in Service module set the mode of working service module

Of course I can "follow" for your example code and do it like you but I would like to understand it

If anywhere it was explained please give me URL.

 

[Roycefer]

You can think of Services as working either in background mode or in foreground mode. If they work in background mode, the OS might kill them occasionally. If they work in foreground, the OS won't kill them. ServiceStart starts a Service in background mode because, most often, it is called from an Activity (all Activities work in foreground mode).

 

[Arturs]

so the service.startforeground switchs working of service into foreground mode ?

 

[Roycefer]

Yes, that is correct. Make sure to call

Service.StopForeground

when you no longer need the Service to be in the foreground.

 

[Arturs]

Ok. Thank you for information.
Today I have another problem, my aplication works well in Debug mode when I released the aplication It does not work

What are differences between Debug and Relase but I think it should work too

I mean 90 % percent works but 10% does not work ;/;/

 

[Arturs]

Can I use some subs from Service module before finishing activity_resume ?
I think No but Is it a solution ?

 

[Roycefer]

You can try CallSub or CallSubDelayed to call subs from a Service module.

 

[Arturs]

Unfortunately. It does not work

 

[Roycefer]

What doesn't work? Are you getting error messages? Are the subs just not executing?

 

[Arturs]

If the aplcation starts first time all Callsub where is called sub from service module are not exectuing (but it is only when the aplication is run first time)

 

[Roycefer]

Try using CallSub, etc... after you've started the Service in question.

 

[Arturs]

Sub Activity_Create(FirstTime As Boolean)
    'Do not forget to load the layout file created with the visual designer. For example:
    Activity.LoadLayout("1")
    Activity.Title = "pH metr"
  
  
        If FirstTime = True Then           
        StartService(BT)          
        Timer1.Initialize("Timer1",100 )  
        End If
      
      
      
End Sub

Sub Activity_Resume

    CallSub(BT,"BT_Status")

End Sub

The above callsub does not work. If the aplication starts first time

Sub Service_Start (StartingIntent As Intent)

Service.StartForeground(0,Null)
               
End Sub

Service_Create is empty