Android Question UltimateListView, different sizes of images

Sub Bild_AddLayoutAndItem(SentMsg As Boolean, MsgID As Int)
    Dim su As StringUtils
    Dim MsgHeight As Int = Max(30dip, su.MeasureMultilineTextHeight(lblMeasure, Messages.Get(MsgID))) + VerticalPadding

    Dim LayoutName As String
    If SentMsg Then
        LayoutName = "Sent" & MsgHeight
    Else
        LayoutName = "Received" & MsgHeight
    End If
    If Not(ULV.LayoutExists(LayoutName)) Then
        ULV.AddLayout(LayoutName, "Bild_LayoutCreator", "Bild_ContentFiller", 275dip, True)
    End If
    ULV.AddItem(LayoutName, MsgID)
End Sub

Sub Bild_LayoutCreator(LayoutName As String, LayoutPanel As Panel)
    Dim lblText, lblZeit As Label
    Dim iv1 As ImageView
    lblText.Initialize("")
    iv1.Initialize("")
    lblZeit.Initialize("")
    iv1.Gravity=Gravity.NO_GRAVITY
    If LayoutName.StartsWith("SENT") Then
        lblText.Background = LoadNinePatchDrawable("balloon_left")
    Else
        lblText.Background = LoadNinePatchDrawable("balloon_right")
    End If
    If LayoutName.StartsWith("SENT") Then
        LayoutPanel.AddView(lblText, 15%x, 0, 85%x, LayoutPanel.Height)
        LayoutPanel.AddView(iv1, 20%x, 10dip, 200dip, 200dip)
        LayoutPanel.AddView(lblZeit, 15%x, LayoutPanel.Height-25dip, 80%x, 15dip)
    Else
        LayoutPanel.AddView(lblText, 0, 0, 85%x, LayoutPanel.Height)
        LayoutPanel.AddView(iv1, 10%x, 35dip, 200dip, 200dip)
        LayoutPanel.AddView(lblZeit, 0, LayoutPanel.Height-25dip, 80%x, 15dip)
    End If
End Sub

Sub Bild_ContentFiller(ItemID As Long, LayoutName As String, LayoutPanel As Panel, Position As Int)
    Dim lblText As Label = LayoutPanel.GetView(0)
    lblText.Text = Messages.Get(ItemID)
    Dim iv1 As ImageView = LayoutPanel.GetView(1)
    If File.Exists(File.DirRootExternal, Dokument.Name)=True Then
        ULV.LoadImageAsync(iv1, "/mnt/sdcard/" & Dokument.Name, ItemID)
    Else
        iv1.Bitmap=kamera_icon
    End If
    Dim lblZeit As Label =LayoutPanel.GetView(2)
    lblZeit.Text = "test"
End Sub