Android Question How to change properties of a button dynamically created

[raphipps2002]

If a sub adds several buttons to a scrollview or activity, dynamically, how is it possible to change properties of those buttons from another sub? or is it not? so say

Sub a1

For I = 1 to 9

      Dim b a button
      Activity. Addview (b....
Next
End sub

Sub a2


    'B as on a1
    Button1.textsize = 10
    Button2.textsize = 12

End sub

 

[LucaMs]

You could use a Map.

Declare a global mapButtons and when you add the button to the Activity add it also to the map.

As map key you could use the Button name or an index.

Then in the a2:
Private Btn as Button = mapButtons.Get(YourKey)
Btn.TextSize = 12

 

[sorex]

another method...

you can add tags to the views in your creation loop
later you can loop through the views that are in that scrollview and check the tag values to find the right one.

 

[raphipps2002]

hi Lucas, that worked a treat....i was really struggling with that one...

and sorcex for his idea

 

[klaus]

If the number of views is given you can declare an array of views.

Sub Globals
    Dim Buttons(9) As Button
End Sub

Sub a1
    For I = 0 to 8
        Buttons(I).Initialize("Buttons")
        Buttons(I).Tag = I
        Activity. Addview (Buttons(I), ..
    Next
End sub

Sub a2
    Buttons(0).TextSize = 10
    Buttons(1).TextSize = 12
End Sub

 

[LucaMs]

We can see two benefits of using maps instead of arrays:

we can not resize the array while preserving the objects already stored, instead we can add and remove items to a map;

we must use integer indexes for arrays, "any" object for maps (in this case the button names, preserving free their tags)

 

[klaus]

@LucaMs
I agree with you, I'm a bit 'old fashioned', I'm more used to arrays than to maps .

 

[raphipps2002]

thanks Klaus, both are useful techniques which I have learnt. In my case the number of views is dynamic too so the map idea worked very well

 

[gruizelgruis]

If the number of views is given you can declare an array of views.

Sub Globals
    Dim Buttons(9) As Button
End Sub

Sub a1
    For I = 0 to 8
        Buttons(I).Initialize("Buttons")
        Buttons(I).Tag = I
        Activity. Addview (Buttons(I), ..
    Next
End sub

Sub a2
    Buttons(0).TextSize = 10
    Buttons(1).TextSize = 12
End Sub

How do I get the index of the button on the click event ?

in VB I would use:
sub button_click(Index as integer)
'// Here I use the index value

end sub

Please advice

 

[Erel]

Make sure to go over this tutorial: Tick-Tack-Toe: working with arrays of views

You can use the Sender keyword to get the button that raised the event.