Activity identity

Your question touches several complex concepts.

The Activity object is different than the Main module object (or any other Activity module object).

In order to start an activity you need to use the Main object not the inner UI Activity object.

For example:

You can use the Me object to pass a reference to the module object. This doesn't work in v1.95 but will work in newer versions:

Erel said:

Your question touches several complex concepts.

Click to expand...

Not scared by complexity

Let me expand a bit on what I wish to do, which will
probably make things a notch easier to understand.

What I want to do is, essentially, a singleton class that gets
instantiated in the main activity.
This class will keep track of what activity is currently running
plus several other informations inferred from this very thing,
such as device orientation, plus will interact with one or
more services to gather other information.
This is being done to keep all of the relevant "status"
information in one place.

Erel said:

The Activity object is different than the Main module object (or any other Activity module object).

Click to expand...

Mind to expand on this a bit, please?

Erel said:

In order to start an activity you need to use the Main object not the inner UI Activity object.

For example:

B4X:

StartActivity("Main") 'you can pass a string
'Or
StartActivity(Main) 'or a reference to the module object

You can use the Me object to pass a reference to the module object. This doesn't work in v1.95 but will work in newer versions:

B4X:

'Class1 module
Sub Class_Globals
 Private TargetModule As Object
End Sub

Sub Initialize(Target As Object)
 TargetModule = Target
 StartActivity(TargetModule)
End Sub

'***************************
'Activity module
Dim c As Class1
c.Initialize(Me)

Click to expand...

Are you saying that my StartActivity code should really read

Main.StartActivity(AnActivity) ?

I am wondering because, as far as I could see until now,
StartActivity works like a charm from all of the
activities I've used it into
Then, if you do some "black magic" I don't know, as
long as it works it's fine with me

The reason I want to check which activity is running is
important to make sure that, for example, if a service
receives a request for a picture and the shooting
activity is already running, it doesn't start it again.
Should never happen, but we all know what has been of
what should have never been...

Once I know that all is good, then start the activity.

Get my point?

Regards,

A

There is a much simpler way to accomplish it.
You can have a process global string variable in the service. In Activity_Resume of each activity add this code:

You will then be able to always check the value of MyService.CurrentActivityName.

With that said it is not really necessary in the case you describe.
You can call IsPaused(ShootingActivity) to test whether the ShootingActivity is running or not.

The best option is to use CallSubDelayed. It will start the activity if necessary and run the specified sub.