Hi I am trying to compile the example using the files provided on the Dropbox in the inital post. 
https://www.b4x.com/android/forum/threads/pdfium-pdfview2.102756/#content by @DonManfred
I am using the Lastest version of B4A along with ver 28 of com.android.support:support-v4
I am getting these compile errors. If you please can advise what I should do. i already re-installed the sdk
		
		
	
	
		
	
		
	
By but i am getting this error
This is the code from the Dropbox
	
	
	
	
	
	
	
		
			
			
			
			
			
		
	
	
	
		
	
	
		
	
			
			https://www.b4x.com/android/forum/threads/pdfium-pdfview2.102756/#content by @DonManfred
I am using the Lastest version of B4A along with ver 28 of com.android.support:support-v4
I am getting these compile errors. If you please can advise what I should do. i already re-installed the sdk
By but i am getting this error
B4A Version: 10.60
Parsing code. (0.00s)
Java Version: 8
Building folders structure. (0.05s)
Compiling code. (0.10s)
Compiling layouts code. (0.09s)
Organizing libraries. (0.00s)
(AndroidX SDK)
Generating R file. (0.46s)
Compiling debugger engine code. (1.03s)
Compiling generated Java code. Error
B4A line: 44
pdf.Initialize(\
javac 1.8.0_111
src\b4a\pdf\main.java:401: error: cannot access OnPageChangeListener
mostCurrent._pdf.Initialize(processBA,"PDFium");
^
class file for com.github.barteksc.pdfviewer.listener.OnPageChangeListener not found
This is the code from the Dropbox
			
				B4X:
			
		
		
		#Region  Project Attributes
    #ApplicationLabel: B4A pdf Example
    #VersionCode: 1
    #VersionName:
    'SupportedOrientations possible values: unspecified, landscape or portrait.
    #SupportedOrientations: unspecified
    #CanInstallToExternalStorage: False
#End Region
#Region  Activity Attributes
    #FullScreen: False
    #IncludeTitle: True
#End Region
#AdditionalJar: android-pdf-viewer.aar
#AdditionalJar: com.android.support:support-v4
#AdditionalJar: Pdfium.aar
#AdditionalJar: Pdfium.androidx.aar
Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'These variables can be accessed from all modules.
End Sub
Sub Globals
    'These global variables will be redeclared each time the activity is created.
    'These variables can only be accessed from this module.
    Private btnFirst As Button
    Private btnPrev As Button
    Private lblPages As Label
    Private btnNext As Button
    Private btnLast As Button
    Private glPages As Int
    Dim pdf As PdfiumCore
    Private PDFView1 As PDFView
    
End Sub
Sub Activity_Create(FirstTime As Boolean)
    Activity.LoadLayout("Layout1")
    pdf.Initialize("PDFium")
    File.Copy(File.DirAssets,"sample.pdf",File.DirInternal,"sample.pdf")
    Dim cfg As Configurator = PDFView1.fromUri(File.DirInternal,"sample.pdf")
    cfg.SetEventname("PDFium")
    cfg.autoSpacing(True).enableSwipe(True).pageSnap(True).swipeHorizontal(False).addOnErrorListener.addOnLoadCompleteListener.addOnPageChangeListener.addOnPageErrorListener.addOnTapListener.load
End Sub
Sub PDFium_loadComplete(pages As Int)
Log($"PDFium_loadComplete(${pages})"$)
glPages = pages
lblPages.Text = $"${glPages}"$
End Sub
Sub PDFium_onInitiallyRendered(page As Int)
    Log($"PDFium_onInitiallyRendered(${page})"$)
End Sub
Sub PDFium_onPageChanged(page As Int, TotalPages As Int)
    Log($"PDFium_onPageChanged(${page},${TotalPages})"$)
    lblPages.Text = $"${page-1}/${glPages}"$
End Sub
Sub PDFium_PageNum(page As Int)
    Log($"PDFium_PageNum(${page})"$)
End Sub
Sub PDFium_Show()
    Log($"PDFium_Show()"$)
End Sub
Sub Activity_Resume
End Sub
Sub Activity_Pause (UserClosed As Boolean)
End Sub
Sub btnFirst_Click
    PDFView1.jumpTo2(0,False)   
End Sub
Sub btnPrev_Click
    PDFView1.jumpTo2(PDFView1.CurrentPage-1,False)
End Sub
Sub lblPages_Click
    
End Sub
Sub btnNext_Click
    PDFView1.jumpTo2(PDFView1.CurrentPage+1,False)
    
End Sub
Sub btnLast_Click
    PDFView1.jumpTo2(glPages-1,False)
End Sub