Android Question read pdf file

Base64EncodeDecodeImage.Base64StringToAnyFile(base64, File.DirInternal, "convert.pdf")
      
            Dim estensione="pdf"
            Dim uri As String="file://" & File.Combine(File.DirInternal & "/", "convert.pdf")
            Dim i As Intent
            i.Initialize(i.ACTION_VIEW, uri)
            i.SetComponent("android/com.android.internal.app.ResolverActivity")
            Select estensione
                Case "pdf"
                    i.SetType("application/pdf")
                Case "docx"
                    i.SetType("application/vnd.openxmlformats-officedocument.wordprocessingml.document")
                    'i.SetType("application/msword")
                Case "txt"
                    i.SetType("text/plain")
                Case "jpg"
                    i.SetType("image/jpg")
                Case "jpeg"
                    i.SetType("image/jpeg")
            End Select
              
            StartActivity(i)