Android Question B4XComboBox

Sergey_New · Jul 23, 2025

The font size of this element cannot be changed after it is created.
A possible solution is to uncomment the lines shown below.

B4X:

Sub Class_Globals
    Private Root As B4XView 'ignore
    Private xui As XUI 'ignore
    Private B4XComboBox1 As B4XComboBox
    Dim lst As List=Array As String("A", "B", "C")
End Sub

Private Sub B4XPage_Created (Root1 As B4XView)
    Root = Root1
    Root.LoadLayout("1")
    B4XComboBox1.SetItems(lst)
    B4XComboBox1.SelectedIndex=1
    B4XComboBox1.cmbBox.TextSize=20
End Sub

Private Sub Button1_Click
'    B4XComboBox1.cmbBox.Clear
'    B4XComboBox1.SetItems(lst)
'    B4XComboBox1.SelectedIndex=1
    B4XComboBox1.cmbBox.TextSize=14
End Sub

Is there really no simple solution?

PaulMeuris · Jul 24, 2025

And what if you do this:

B4X:

    B4XComboBox1.cmbBox.TextSize = 14
    B4XComboBox1.cmbBox.SelectedIndex = 1

The B4XComboBox1 should redraw itself to show the selected index.
This way you don't need to refill the items list.
Note: remember the first item has index = 0

Sergey_New · Jul 24, 2025

PaulMeuris said:
And what if you do this:

Doesn't work. You need to change the index, but you can't return the index to the original value.
I've attached an example, check it out.

PaulMeuris · Jul 24, 2025

B4X:

Private Sub Button1_Click
'    B4XComboBox1.cmbBox.Clear
'    B4XComboBox1.SetItems(lst)
    B4XComboBox1.cmbBox.TextSize=14
    B4XComboBox1.SelectedIndex=0
    Sleep(0)
    B4XComboBox1.SelectedIndex=1
End Sub

You can temporally change the selectedindex and then reset it to the original value.
The sleep method allows the combobox to redraw itself.

Sergey_New · Jul 24, 2025

PaulMeuris said:
You can temporally change the selectedindex

This is roughly the same method as in post #1. I'm looking for a method to redraw a B4XComboBox, possibly using JavaObject.

PaulMeuris · Jul 24, 2025

Sergey_New said:
This is roughly the same method as in post #1

With one big difference: you don't have to refill the items list which can be time consuming if it's a long list...
Using a JavaObject on a custom view... good luck with that...

Sergey_New · Jul 24, 2025

PaulMeuris said:
if it's a long list

Test it on 1000 elements, how long will it take? And such long lists for B4XComboBox are nonsense.

valerioup · Jul 24, 2025

solutions:

Private Sub Button1_Click
 For Each v As B4XView In Root.GetAllViewsRecursive
       If v Is Button Then 
       Else           
            If v Is Label Then               
                v.TextSize=14
            End If
       End If
    Next
End Sub

try this

Sergey_New · Jul 24, 2025

valerioup said:
try this

Thanks for the tip!
The correct solution is:

B4X:

Private Sub Button1_Click
    For Each v As B4XView In Root.GetAllViewsRecursive
        If v Is Button Then
        
        Else If v.Tag Is B4XComboBox Then
            Dim cmb As B4XComboBox=v.Tag
            cmb.cmbBox.TextSize=14
        Else if v Is Label Then
            v.TextSize=14
        End If
    Next
End Sub

Android Question B4XComboBox

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