How to exit application?

[prokli]

Hello everybody!

Could you give me some ideas, how to deal with the "Android Process and activities life cycle". Believe me, I have read this chapter several times and I fear, that I still don't understand it.

Following scenario:
My project keeps one activity including a so called "Exit" button and a service (ComServ) running in background. Typing the exit button, I would like to finish my application!

That's the simplified code of my activity

Sub Activity_Create(FirstTime As Boolean)

Activity.LoadLayout("StartScreen")

If FirstTime Then
' right here I start the service
StartService(ComServ)
End If
End Sub

Code of Exit button:

Sub ExitButton_Click

StopService(ComServ)
Activity.Finish

End Sub

Now, what happens?
If I type the exit button, the service is destroyed and the activity goes into "Pause" mode ( I can see both events on the Log window of the IDE). If I restart the application, the activity moves from "Pause" to "Create" to "Resume". But - and this is the thing what makes me foolish - the "FirstTime" variable is set "False" and therefore the service won't be started again. Bad thing!

If I modify the code of exit button, it works!

Sub ExitButton_Click

StopService(ComServ)
ExitApplication

End Sub

As I have read several times in this forum, using "ExitApplication" is not the appropriate way to exit applications. So what is the best way???

Regards,
Harald

 

[Erel]

you have two options. Either call ExitApplication or change your program logic and start the service in Activity_Create, and not just when FirstTime=True.

The process itself can be killed by the OS or when you call ExitApplication. Stopping all the services and activities doesn't immediately kills the process.

 

[prokli]

Thanks, Erel!

I already build a project version, which starts the servive in "Activity_Create" independently of "FirstTime" flag.
BUT: what happens if I rotate may tab?
Service will be re-created while it is still running. This didn't work!

 

[Erel]

Service_Create will run the first time. Service_Start will run once for every call to StartService.

You can use IsPaused to test whether the service is already running.

 

[wes58]

Since the topic is "How to exit application?", I thought I will ask a question.
I have two Activities. I call second Activity from the first one using StartActivity(gpslocation).
In the Second Activity I have a Button Quit. If I press this button I want to exit application not to go to the first Activity.
I put in button Quit_Click subroutine, Exit Application, but it doesn't close application, it goes to the first Activity. I tried putting Activity.Finish and ExitApplication, but it does the same thing.

Is there a way to close (completely) application from from the second activity?

 

[Erel]

The simplest solution is to call Activity.Finish right after calling StartActivity(second activity).