Android Question Solved: use 1 argument in 2 Subs

anOparator · Jan 2, 2017

Am trying to use an argument from a Sub that has a CustomView,

B4X:

 Sub TabStrip1_PageSelected (Position As  Int)
Log($"Current page: ${Position}"$)
End Sub

Can the "Position" argument" be used in a different Sub?

B4X:

Sub Scoreboard
Label1.Text = $"${Position}"$
End Sub

And, if it is possible, what is this feature called.
thanks

Cableguy · Jan 2, 2017

anOparator said:
Am trying to use an argument from a Sub that has a CustomView,

B4X:

Sub TabStrip1_PageSelected (Position As Int) Log($"Current page: ${Position}"$) End Sub

Can the "Position" argument" be used in a different Sub?

B4X:

Sub Scoreboard Label1.Text = $"${Position}"$ End Sub

And, if it is possible, what is this feature called.
thanks

Create a global variable with a meaninfull name. (ie dim mPosition as int)
then...

B4X:

Sub TabStrip1_PageSelected (Position As  Int)
Log($"Current page: ${Position}"$)
mPosition = Position
End Sub

Sub Scoreboard
Label1.Text = $"${mPosition}"$End Sub

stevel05 · Jan 2, 2017

Or pass it directly

B4X:

Sub TabStrip1_PageSelected (Position As  Int)
     Log($"Current page: ${Position}"$)
     ScoreBoard(Position)
End Sub

Sub Scoreboard(Position As int)
     Label1.Text = $"${Position}"$
End Sub

Cableguy · Jan 2, 2017

yes, but using a global variable enables to call the scoreboard at any time, and not in sequence with the sub that originated the value

Mahares · Jan 2, 2017

Cableguy said:
yes, but using a global variable enables to call the scoreboard at any time

That is true. But the TabStrip1_PageSelected event is always triggered when you are flipping pages in Tabstrip1. Consequently, a position change occurs.

Cableguy · Jan 2, 2017

yes, but if I understand it correctly, the scoreboard sub in this example is a dummy sub, and the real one may be used in more situations than just in sequence with the tabstrip...
If this example sub is a real one, then it would make more sense to just include the label.text change in the tabstrip event

stevel05 · Jan 2, 2017

Which is why you can never get a definitive answer to a question without providing all the relevant details.

Ed Brown · Jan 2, 2017

I prefer to pass the variable as an argument. This ensures that the value being passed has not changed to something else in the meantime or part way through the processing. ie. pass the value to guarantee that is does not change to something else that both the originator and receiver subs are not expecting. If it does change to a different value then it can have unwanted and unexpected effects/results.

This is more relevant to apps that use multi-threading but I find it good practice in general to pass the values instead of relying on global variables.

anOparator · Jan 3, 2017

Cableguy said:
Create a global variable with a meaninfull name. (ie dim mPosition as int)
then...

B4X:

Sub TabStrip1_PageSelected (Position As Int) Log($"Current page: ${Position}"$) mPosition = Position End Sub Sub Scoreboard Label1.Text = $"${mPosition}"$End Sub

thanks for the Global approach, I now see that I may be able to use it with "lbl" and "edt" instead of the arguments.
just doing my deja vu.

anOparator · Jan 3, 2017

I learned a lot from the feedback, thanks to all. Now I feel closer to resolving how to Update/Save additions to Labels.

Once I get to that point I hope I won't need keyvaluestore, but if needed I can handle kvs.

Android Question Solved: use 1 argument in 2 Subs

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