ScrollView Problem

Johnmcenroy · Dec 2, 2012

I have the following code:

B4X:

Sub ScrollCarols_CreateList
   Dim List1 As List
   
   Dim scList As List
   scList.Initialize
   
   Dim scS As Panel
   scS.Initialize ("")
   
   List1 = File.ReadList(File.DirAssets, "Carols.txt")
    For i = 0 To List1.Size - 1
      scList.Add(scS)
      ScrollCarols.Panel.AddView (scList.Get(i),0,0,100%x,40dip)
    Next
End Sub

Debugger says : You must call RemoveView () on the child's parent first.

But i add views programmatically , only ScrollView is in designer.

Erel · Dec 2, 2012

You have created a single panel. You cannot add it more than once.

I recommend you to use CustomListView class.

Johnmcenroy · Dec 2, 2012

Erel said:
You have created a single panel. You cannot add it more than once.

I recommend you to use CustomListView class.

Thanks Erel. I will look at it. In this project i need panels , each contains Checkbox,Label and ImageView , and then each panel is added to ScrollView/CustomListview. The number of these panels must be generated depending number of strings in text file. How can i achieve this - ScrollView , CustomListView ?

Johnmcenroy · Dec 3, 2012

So i need dynamicly generated panels based on number of strings in text file.

klaus · Dec 3, 2012

In your code example you must Dim and Initialize the panels inside the For / Next loop.

B4X:

Sub ScrollCarols_CreateList
    Dim List1 As List
    
    Dim scList As List
    scList.Initialize

    List1 = File.ReadList(File.DirAssets, "Carols.txt")
    For i = 0 To List1.Size - 1
        Dim scS As Panel
        scS.Initialize ("")
        scList.Add(scS)
        ScrollCarols.Panel.AddView (scS, 0, i * 40dip, 100%x, 40dip)
    Next
End Sub

You must also increase the Top property of the panels i * 40dip insread of 0.

But anyway Erels suggestion is still the best one.

Best regards.

Johnmcenroy · Dec 4, 2012

Thank you Klaus. Yes I understood that CustomListview is better. Thanks.

Johnmcenroy · Dec 4, 2012

CustomListView is perfect. It is exact that i wanted. But one question - how to make it transparent ?

Johnmcenroy · Dec 4, 2012

Johnmcenroy said:
CustomListView is perfect. It is exact that i wanted. But one question - how to make it transparent ?

I found myself. In CustomListView class scrollview (sv) must be set to sv.Color = Colors.ARGB (0,255,255,255)

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