iOS Question b4a download manager in b4i

[kozbot]

So, I've used the below code in b4a, and I'm trying to get the same thing to happen in b4i. How can I download a pdf file from a website using the url, and open it with a pdf reader (of the users choice), and then if the user tries to download it again, and it's already been downloaded, it'll open the downloaded file. And all this happens on a button click.

I realise that there are ways of doing it by having the pdf in the app and stuff, but which this particular app, there are well over 100 pdf files to include, and it seems silly to force the user to download a ridiculously big app for the few files that the user might use.

So, here's the code, I hope someone can help. Thanks.

Sub Button2_Click
If File.exists(File.DirRootExternal, "D8xDeluxeInstallerGuide.pdf") Then
Dim intent1 As Intent
            intent1.Initialize(intent1.ACTION_VIEW, "file://"&File.Combine(File.DirRootExternal, "D8xDeluxeInstallerGuide.pdf"))
            intent1.SetType("application/pdf")
            intent1.WrapAsIntentChooser("Choose PDF Viewer")
            StartActivity(intent1)
Else
    DOWNLOAD_ADDRESS = "http://nesscorporation.com/InstallationManual/Ness_D8xD16x_Deluxe_installer_manual.pdf"
       DOWNLOAD_FILENAME = "D8xDeluxeInstallerGuide.pdf"
    Dim DownloadManagerRequest1 As DownloadManagerRequest
       DownloadManagerRequest1.Initialize(DOWNLOAD_ADDRESS)
       DownloadManagerRequest1.Description="D8x Deluxe Installer Guide"
   '   save the download to external memory
   '   note you must manually update your project's manifest file adding android.permission.WRITE_EXTERNAL_STORAGE
       DownloadManagerRequest1.DestinationUri="file://"&File.Combine(File.DirRootExternal, DOWNLOAD_FILENAME)
       DownloadManagerRequest1.Title=DOWNLOAD_FILENAME
       DownloadManagerRequest1.VisibleInDownloadsUi=True
  
   DownloadId=DownloadManager1.Enqueue(DownloadManagerRequest1)
   End If
End Sub
Sub DownloadManager1_DownloadComplete(DownloadId1 As Long)
   '   this does not guarantee that the download has actually successfully downloaded
   '   it means a DownloadMananger DownloadManagerRequest has completed
   '   we need to find that status of that request but only if that request matches the request we started
   If DownloadId=DownloadId1 Then
      '   this is the download request we started
      '   query the DownloadManager for info on this request
      Dim DownloadManagerQuery1 As DownloadManagerQuery
      DownloadManagerQuery1.Initialize
      DownloadManagerQuery1.SetFilterById(DownloadId)
     
      '   you must enable the SQL library to work with the Cursor object
      Dim StatusCursor As Cursor
      '   pass our DownloadManagerQuery to the DownloadManager
      StatusCursor=DownloadManager1.Query(DownloadManagerQuery1)
      If StatusCursor.RowCount>0 Then
         StatusCursor.Position=0  
        
         Dim StatusInt As Int
         StatusInt=StatusCursor.getInt(DownloadManager1.COLUMN_STATUS)
         Log("Download Status = "&Utils.GetStatusText(StatusInt))

         If StatusInt=DownloadManager1.STATUS_FAILED Or StatusInt=DownloadManager1.STATUS_PAUSED Then
            Dim ReasonInt As Int
            ReasonInt=StatusCursor.GetInt(DownloadManager1.COLUMN_REASON)
            Log("Status Reason = "&Utils.GetReasonText(ReasonInt))
         End If
        
         If StatusInt=DownloadManager1.STATUS_SUCCESSFUL Then
            Dim intent1 As Intent
            intent1.Initialize(intent1.ACTION_VIEW, "file://"&File.Combine(File.DirRootExternal, DOWNLOAD_FILENAME))
            intent1.SetType("application/pdf")
            intent1.WrapAsIntentChooser("Choose PDF Viewer")
            StartActivity(intent1)
         End If
        
      Else
         '   always check that the Cursor returned from the DownloadManager Query method is not empty
         Log("The DownloadManager has no trace of our request, it could have been cancelled by the user using the Android Downloads app or an unknown error has occurred.")
      End If
     
      StatusCursor.Close
      StopService("")
   End If
End Sub

 

[Erel]

You should use HttpUtils2 to download files:
https://www.b4x.com/android/forum/threads/class-httputils2.46565/#content

You can then show the pdf with WebView or with Canvas.