Android Question PreoptimizedCLV lag issue

[Kasun Kanchana]

Hi everyone. I'm using PreoptimizedCLV to list-out products in customlistview. When I'm scrolling down I'm facing little bit lag as below,


Is it normal or not?

I've use below code,

Sub Globals
    Private XUI As XUI
    Private PCLV As PreoptimizedCLV
    
    
    'product list iems
    Private Panel1 As B4XView
    Private img As B4XView
    Private lbl_description As B4XView
    Private lbl_title As B4XView
    Type TestData (title As String,description As String )
    
End Sub

Sub add_list_items
    For x =1 To 100
           
        Dim td As TestData
        td.Initialize
        
        td.title="Product title " & x
        td.description="Product description " & x
        
        PCLV.AddItem(135dip, XUI.Color_White, td)

    Next
    PCLV.ShowScrollBar = True 'no fast scrolling
    PCLV.ExtraItems = 5
    PCLV.Commit
End Sub

Sub CustomListView1_VisibleRangeChanged (FirstIndex As Int, LastIndex As Int)
    For Each i As Int In PCLV.VisibleRangeChanged(FirstIndex, LastIndex)
        Dim item As CLVItem = CustomListView1.GetRawListItem(i)
        Dim td As TestData=item.Value
        
        Dim pnl As B4XView = XUI.CreatePanel("")
        item.Panel.AddView(pnl, 0, 0, item.Panel.Width, 135dip)
        'Create the item layout
        pnl.LoadLayout("Item")
        lbl_title.Text=td.title
        lbl_description.Text=td.description
    Next
End Sub

If anyone know how to fix this, Please let me know. Thank you

 

[Toky Olivier]

Normally, idea behind using PreoptimizedCLV lazy loading feature is to remove those lags. What shows example code from the lib page: https://www.b4x.com/android/forum/t...extension-for-xcustomlistview.115289/#content ?

 

[Peter Simpson]

If anyone know how to fix this, Please let me know. Thank you

Private video???
anyway, are you testing it in release mode?

 

[Kasun Kanchana]

@Peter Simpson Thank you for your reply. I've tested this in release mode. If I integrate it with MySQL and load data from MySQL database,its not lagging. If I populate data just a loop its bit lagging. You can see it clearly in the last few minutes of the video. If you cant see the video, Please let me know. Thank you

 

[Erel]

Remove the image from the layout file. Load it once with XUI.LoadBitmapResize and set it in your code.