Android Question Error NullPointerException using MSDynamicGridView Library

[asales]

I'm using the MSDynamicGridView Library (https://www.b4x.com/android/forum/threads/msdynamicgridview-library.49331/page-4) from @thedesolatesoul to display images, since was release.

I update to the B4A 5.8 and move some variables from Main to Starter (the list with the names of file of imagens remains in the Main).

Now, in some devices I get this error (in others the error not occours).
I don't know the causes and how to fix it.
Someone that uses this library have the same issue?

~e:main_da_getcontent (java line: 1477)
~e:java.lang.NullPointerException: Attempt to read from field 'anywheresoftware.b4a.objects.collections.List br.com.myimages.main._vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv6' on a null object reference
~e: at br.com.myimages.main._da_getcontent(main.java:1477)
~e: at java.lang.reflect.Method.invoke(Native Method)
~e: at java.lang.reflect.Method.invoke(Method.java:372)
~e: at anywheresoftware.b4a.BA.raiseEvent2(BA.java:169)
~e: at com.maximussoft.gridviews.B4ADynamicGridAdapter.getView(B4ADynamicGridAdapter.java:66)
~e: at android.widget.AbsListView.obtainView(AbsListView.java:2344)
~e: at android.widget.GridView.onMeasure(GridView.java:1060)
~e: at android.view.View.measure(View.java:17448)
~e: at android.view.ViewGroup.measureChild(ViewGroup.java:5436)
~e: at android.view.ViewGroup.measureChildren(ViewGroup.java:5413)

This is my code:

Sub DA_GetLayout(Position As Int, ItemID As Long, ItemTag As String) As Panel
    Dim p As Panel
    p.Initialize("")

    Dim iv As ImageView
    iv.Initialize("iv")
    iv.Gravity = Gravity.Fill

    p.AddView(iv, 1dip, 1dip, (pnlGrid.Width/NumCols)-2dip, (pnlGrid.Width/NumCols)-2dip)
 
    Return p
End Sub

Sub DA_GetContent(Position As Int, ItemID As Long, ItemTag As String, ContentPanel As Panel) As Panel
    Try 'change to capture the exception
        Dim iv1 As ImageView = ContentPanel.GetView(0)

        ContentPanel.Color = Colors.White

        Dim Bitmap1 As Bitmap
        Bitmap1.InitializeSample(File.DirAssets, GridItems.Get(ItemID), 200, 200)

        iv1.Bitmap = Bitmap1
        iv1.Visible = True 
    Catch
        ToastMessageShow(LastException.Message & " - " & ItemID, False)
        Log(LastException)
        Log("ItemID: " & ItemID)
    End Try
         
    Return ContentPanel
End Sub

 

[Erel]

Are you able to reproduce it in debug mode?

My guess is that GridItems list was not initialized.

 

[asales]

I'll try. Thanks!

 

[JohnC]

I am also getting a critical crash with the grid and provided more of my details in the author's thread:

https://www.b4x.com/android/forum/threads/msdynamicgridview-library.49331/page-4#post-442503