B4A Library [Lib] CoverFlow v2.0

Hi guys, as I have promised, CoverFlow is here.

Download the Coverflow.zip

The zip contains the library and an example that´s all

The CoverFlow Class = Neil Davies

Giuseppe Salvi
Version: 2
  • PhotoFlow
    • ItemClick (Position As Int, Value As Object)
    • ItemLongClick (Position As Int, Value As Object)
    • ItemSelected (Position As Int, Value As Object)
    • AddImage (Dir As String, FileName As String)
      Add an image at the end of the PhotoFlow from sdcard or AssetsDir
    • AddImageAt (index As Int, Dir As String, FileName As String)
      Add an image to the desired position in the PhotoFlow from sdcard or AssetsDir
    • BringToFront
    • ClearCache
      Delete entire disk and memory cache created before
    • GetImageListFromAssets (path As String) As List
      Get entire list of images stored in assets folder
      Dim lv as ListView
      Dim l as list
      Sub Menu_Click
      l = Coverflow.GetImageListFromAssets("Here the Images path u've in assets")
      For n = 0 To l.Size-1
      End Sub
    • GetItem (position As Int) As String
      Returns Item
    • InitializeCarousel (EventName As String)
      Initialize the Carousel
    • InitializeCoverflow (EventName As String)
      Initialize the PhotoFlow
    • IsInitialized As Boolean
    • PopulatePhotoFlow (dir As String, path As String)
      Populate PhotoFlow from sdcard not from assets
    • PopulatePhotoFlowFromAssets (path As String)
      Populate CoverFlow from assets not from sdcard
    • RemoveView
    • SendToBack
    • SetBackgroundImage (arg0 As Bitmap)
    • SetLayout (arg0 As Int, arg1 As Int, arg2 As Int, arg3 As Int)
    • android.permission.WRITE_EXTERNAL_STORAGE
    • AnimationDuration As Int [write only]
      Sets how long the transition animation should run when a child view changes position.
    • Carousel As Boolean [write only]
      Set as Carousel
    • Color As Int [write only]
    • CreateCache As String [write only]
      Sets the name of your own cache
      PhotoFlow.CreateCache = "Your cache Name Here")
      It'll create a cache in "Android/data/Your cache name/cache/.thumbs" in to SdCard
    • Enabled As Boolean
    • FadingEdgeLength As Int [write only]
      Set the size of the faded edge used to indicate that more content in this view is available.
    • Height As Int
    • ItemHeight As Int
      Get or Set ItemHeight
    • ItemWidth As Int
      Get or Sets ItemWidth
    • Left As Int
    • Length As Int [read only]
      Returns lenght
    • Reverse As Boolean [write only]
      Set reverse
    • Selection As Int [write only]
      Jump directly to a specific item in the adapter data.
    • ShowText As Boolean
      Get or Sets the visibility of the text - by default is hide
    • Spacing As Int [write only]
      Sets the spacing between items in a Gallery
    • Tag As Object
    • TextColor As Int
      Get or Sets Text Color - by default is White
    • TextSize As Int
      Get or Sets Text size
    • Top As Int
    • Version As String [read only]
      Return Author and Version of this library
    • Visible As Boolean
    • Width As Int


  • coverflow.jpg
    83.8 KB · Views: 2,407
  • coverflow2.jpg
    81.1 KB · Views: 2,198
  • CoverFlow with Text.jpg
    CoverFlow with Text.jpg
    115.6 KB · Views: 1,614
  • B4ACoverFlow v.1.70.zip
    36.2 KB · Views: 488
  • B4ACoverFlow v.1.80.zip
    40.2 KB · Views: 488
  • B4ACoverFlow v2.0 fix.zip
    40.6 KB · Views: 1,102
Last edited:


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No hurry, i have just ask...i know that there is a loot of javascript cooding...so i will wait.

Do You have any good tutorial how can i write library for B4A using java code? I diassembled some apk and would like to copy code and make library for one component from this apk.I need tutorial to learn how to write library.



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hello lonelystar , i noticed that when u scroll , the image is loaded , do u mind to share some codes about doing that? i have lots of images i want to add to list , so instead of adding them directly using a loop wish becomes slow , it would fill the list and when the list is finished it will fill then the images hope u did understand my point , any suggestions are appreciated , tnx man keep forward :)


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Hi MrJoey, I think I understand, but can U make an example in B4Android?.
Sub ScrollView1_ScrollChanged(Position As Int)
'If Ind < (mapa.Size/9 )-1 Then
    If Position + ScrollView1.Height >= ScrollView1.Panel.Height Then
    If DateTime.Now > lastAddItemsTime + 1 Then
      lastAddItemsTime = DateTime.Now
    End If
  End If
'End If 
End Sub
this code loads additional items when the scrollview reaches a specific number of items so lets say there is 20 panels added to this scrollview and instead of making a loop to fill that 20 panels once , it add let say 10 and then when the user scrolls down it will add the other 10 , that way is very efficient and public , i think u are using this method in kind of ways , i would like u to share an idea of urs to display images instead , tnx :)


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Hi, i im playing with this excellent library and would like to ask if is possible to get images direct from httputils2 using Job.GetBitmap.

I would like to fill coverflow with images from my url link of my server, not to save it to device.

So i have sucessfully used this:


but this sets last image retrieved from server, witch is what i expected.

So i need the code if is possible to add image to CoverFlow instead of saving it to device.

For example:



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hey , 1 suggestion for next update , im using B4Agallery , and there is a function called setarraylist , can u include it in coverflow? thank u


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aha appreciate ur hardwork , take ur time man , so this update will coverflow includes setarraylist or the next update u mean? :)