Android Question [Custom List View] Best Way For change Item Height?

Roberto P. · Oct 16, 2016

HI to All
I have to dynamically change the height of an element inserted in the Custom ListView.
To start I deleted item and inserted again with modified height.
Is there a better way?
thanks

Erel · Oct 17, 2016

You need to remove and insert back the item. You don't need to create a new item (though it will not really matter).

Roberto P. · Oct 17, 2016

Hi Erel,
It is what I did.

I think it would be better to add the function to change the height of the elements without having to delete and back the item.

thanks

LucaMs · Oct 17, 2016

Roberto P. said:
I think it would be better to add the function to change the height of the elements without having to delete and back the item.

... resizing each item's view automatically?

LucaMs · Oct 17, 2016

LucaMs said:
... resizing each item's view automatically?

Well, there might be a parameter to automatically resize or add/cut space on top or bottom (5 constants). (?)

Roberto P. · Oct 17, 2016

I'll explain with an example.
I have to be able to increase \ decrease the height of a single element when I press the button.

LucaMs · Oct 17, 2016

So you need a "collapsible item".

I think @Informatix's CheckList has it.

Roberto P. · Oct 17, 2016

exact! But with custom listview.

I'll watch the indicated class.

thank you

klaus · Oct 17, 2016

You could use a routine like this:

B4X:

Sub ChangeItemPanelHeight(clv As CustomListView, Index As Int, DeltaHeight As Int)
    Private i As Int
    Private pnl1, pnl2 As Panel
    Private sv As ScrollView
    sv = clv.AsView   'gets the CustoListViews' ScrollView
    pnl1 = sv.Panel    'gets the ScrollView.Panel
    pnl2 = pnl1.GetView(Index)   'gets the item Panel with the given Index
    pnl2.Height = pnl2.Height + DeltaHeight   'changes the item Panel height

    For i = Index + 1 To pnl1.NumberOfViews -1   'changes the Top property of all the Panels above the index Panel
        Private pnl As Panel
        pnl = pnl1.GetView(i)
        pnl.Top = pnl.Top + DeltaHeight
    Next

    sv.Panel.Height = sv.Panel.Height + DeltaHeight   'changes the ScrollView.Panel.Height
End Sub

The advantage of this routine is that you use in your code, without changing the Class code.
The function could of course also be done in the Class code.

Roberto P. · Oct 18, 2016

Many thanks Klaus
I add the function in the standard class.

Android Question [Custom List View] Best Way For change Item Height?

Roberto P.

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