Android Question Registering a callback from a code module

[rzv25]

Hello all,

It is very possible for my problem to have a very simple solution, but I did not find anything searching the forum, so I apologize in advance if this is the case.

The functionality of my application is split in code modules. So for example I have a GPS code module that offers a asynchronous service for getting the current location. The service is used by other code modules, like for example the smsParser. I would like to call for example from smsParser module the Gps_Start() function in the Gps module sending as parameter the name of a callback residing in smsParser module. This callback should be called when Gps process of determining current location is finished.

I thought I could just pass the name of the callback to the Gps_Start() sub as string and then use CallSub() from Gps module when location is determined, but the comments of the CallSub function states: 'Note that it is not possible to call subs of code modules'.

I appreciate any ideas that you have.

Thank you.

 

[Erel]

The solution is simple. You should use classes instead of code modules as code modules cannot handle events.

Add instances of these classes to the process globals of the starter service and initialize them in Service_Create.

 

[rzv25]

Understood. Thank you very much for the answer, Erel.

 

[rzv25]

Me again.
I have created a class that has one event but now I have another dilemma. The 'Initialize' method of the class has 2 parameters, like in the example provided in UserGuide:

Public Sub Initialize (vCallback As Object, vEventName As String)
    EventName = vEventName
    CallBack = vCallback
End Sub

and the event from the class is called like this:

If SubExists(Callback, EventName & "_ValuesChanged") Then
CallSub(Callback, EventName & "_ValuesChanged")
End If

I declare an instance of the class in a code module and I need to pass it as first parameter an object. What should I pass, as Me keyword does not work in code modules ?

I saw some libraries (like GPS for example) have only one parameter for Initialize method, and that is the event name. So I can declare an object of type GPS in my code module and have the event for location changed implemented in the code module. Is this possible with a class ? If yes, how should I make the call to the event from the class' code ?

Thank you

 

[Erel]

Note that the SubExists check is not really needed. Nothing will happen if the sub doesn't exist.

I declare an instance of the class in a code module and I need to pass it as first parameter an object. What should I pass, as Me keyword does not work in code modules ?

Code modules cannot handle events. Move it to the starter service (and use Me).

 

[rzv25]

Thank you for the reply, Erel. I would like to organize my code based on functionality, in code modules. I don't want to move everything in starter service.


What about the other question I had ?

I saw some libraries (like GPS for example) have only one parameter for Initialize method, and that is the event name. So I can declare an object of type GPS in my code module and have the event for location changed implemented in the code module. Is this possible with a class ? If yes, how should I make the call to the event from the class' code ?

Thank you

 

[Erel]

I don't want to move everything in starter service.

Use classes instead of code modules.

You cannot handle any event in code modules, including the LocationChanged event of the GPS library.

 

[rzv25]

Thank you, Erel