Android Question PreoptimizedCLV and SeekBar

[gmachacek]

Hello,
I am using CLV with PCLV lazy loading. It works, but PCLV is creating a seek bar and I am not able to change it's properties nother get events fired.
If I try to initialize the seek bar like PCLV.B4XSeekBar1.Initialize(Me,"B4XSeekBar1") I get following error

java.lang.NullPointerException: Attempt to invoke virtual method 'android.graphics.Rect anywheresoftware.b4a.objects.B4XCanvas$B4XRect.toRect()' on a null object reference

This is my sub

Sub fillPCLV()
    
    Try
        Dim isAlter As Boolean = True
        
        PCLV.Initialize(Me, "PCLV", lstCustInventurList)
        Do While PCLV.IsInitialized = False
        Loop
        PCLV.NumberOfSteps = 20
        
        For Each InventurPosi As InventurPosStruct In InventurPosList

            If SelectedInvPosItem.Id = InventurPosi.Id Then currInventurPosIndex = lstCustInventurList.Size
            
            If isAlter = True Then
                If InventurPosi.workedon = True Then
                    PCLV.AddItem(160dip, Colors.ARGB(255,235,255,255), InventurPosi)
                    isAlter = False
                Else
                    PCLV.AddItem(160dip, Colors.ARGB(245,255,255,255), InventurPosi)
                    isAlter = False
                End If
            Else
                If InventurPosi.workedon = True Then
                PCLV.AddItem(160dip, Colors.ARGB(255,235,255,255), InventurPosi)
                    isAlter = True
                Else
                    PCLV.AddItem(160dip, Colors.ARGB(255,255,255,255), InventurPosi)
                    isAlter = True
                End If
            End If
        Next
                        
        PCLV.Commit   
                
        PCLV.B4XSeekBar1.Initialize(Me,"B4XSeekBar1")
                
        ProgressDialogHide
    Catch
        Log(LastException.Message)
        ProgressDialogHide
    End Try
End Sub

Then I thought maybe it is initialized with PCLV like in some cases the disigner does it for objects. Does not look like!
Maybe somebody could help because I didn't find any example!
Thanks in advance
Georg

 

[AnandGupta]

Check Xui view version.

The b4xlib is a cross platform library. It depends on XUI Views v2.27+. XUI Views is an internal library and should be copied to the internal libraries folder.

Regards,

Anand

 

[gmachacek]

I use xCustomListView 1.72 and XUI View 2.30
Regards
Georg

 

[Erel]

If I try to initialize the seek bar like PCLV.B4XSeekBar1.Initialize(Me,"B4XSeekBar1") I get following error

That's expected.

Remove this:

 Do While PCLV.IsInitialized = False
        Loop

The seekbar event is handled internally.

What are you trying to change?

 

[gmachacek]

Hello Erel,
I know that this loop is not a nice solution but sometimes on first load i get no items loaded.
But this is not my main prob.

What I am trying is that the user could move up and down in the list with the slider. Scrolling is functioning perfect.
If I move the seekbar nothing happens to the list, just the seekbar marker is moved and the marker gets bigger during sliding.
Event is not fired

Sub B4XSeekBar1_ValueChanged (Value As Int, UserChanged As Boolean)

Any other idea?
thx
Georg

 

[Erel]

I know that this loop is not a nice solution but sometimes on first load i get no items loaded.

This loop will never do anything positive.

Read the tutorial and see how you should use this class: https://www.b4x.com/android/forum/t...loading-extension-for-xcustomlistview.115289/

 

[gmachacek]

Hello Erel,
you can close the thread.
Stoping to try initializing the seek bar solved the prob.
Thx you
Georg

 

[gmachacek]

... and I will remove that loop!