Android Question I'm confused - services and process global variables!

[Graeme Tacon]

Relatively new to B4A, so excuse the, possibly daft, question, which is probably down to my complete misunderstanding!

The app I'm writing has a few activities and a service that get kicked off with a StartServiceAt command. All works fine, unless the process is shut down before the service start time. The service then dies with a null exception.

Looking at various posts on the site, I think the problem is that my service uses variables defined in the Main activity Process Globals.

What is the best way around this ? Would the same problem occur if I move those variables to the Code Module process globals ? Should I write the variables I need to storage (with kvs for example) in the activity and read them back in as part of the service ?

Should variables defined in Activity Process Globals only be used by other activities ?

Any help / advice appreciated.

Thanks
Graeme

 

[Erel]

It doesn't matter where the process global variables are declared.

You can access variables from the Main module. However you should understand that the code in Activity_Create didn't run in this case as the activity was not created.

One solution is to use a code module for all the shared resources with an Init sub:

Sub Init
 If InitHasAlreadyRun = True Then Return
 InitHasAlreadyRun = True
 SQL1.Initialize(...)
 ...
End Sub

Now you should call this sub (SharedModule.Init) from each of the starting points.

 

[Graeme Tacon]

Thanks Erel - makes sense now