Android Tutorial Download huge files with HttpUtils2

Erel · Jun 13, 2013

Better to use: https://www.b4x.com/android/forum/threads/simple-progress-http-download.127214/#post-796463

The attached project includes a slightly modified version of HttpUtils2 and a new service named DownloadService. The purpose of DownloadService is to make it simple to download files of any size.

It is very simple to use this service.

Start a download:

B4X:

Sub btnDownload_Click
   Dim dd As DownloadData
   dd.url = link1 '<--- download link
   dd.EventName = "dd"
   dd.Target = Me
   CallSubDelayed2(DownloadService, "StartDownload", dd)
End Sub

Handle the events:

B4X:

Sub dd_Progress(Progress As Long, Total As Long)
   ProgressBar1.Progress = Progress / Total * 100
   Label1.Text = NumberFormat(Progress / 1024, 0, 0) & "KB / " & _
      NumberFormat(Total / 1024, 0, 0) & "KB"
End Sub

Sub dd_Complete(Job As HttpJob)
   Log("Job completed: " & Job.Success)
   Job.Release
End Sub

Cancel a download:

B4X:

Sub btnCancel_Click
   CallSubDelayed2(DownloadService, "CancelDownload", link1)
End Sub

DownloadService allows you to download multiple files at once and track the progress of each one of them.

The following libraries are required:
OkHttp
StringUtils
Phone (required in order to acquire a partial lock during the download)
RandomAccessFile

As this is a modified version of OkHttpUtils2 you should not reference OkHttpUtils2 library. You should instead add the three modules from the attached project. Note that the modified code is in Sub hc_ResponseSuccess.

Erel · Dec 6, 2015

You can take OkHttpUtils source code: https://www.b4x.com/android/forum/threads/okhttp-replaces-the-http-library.54723/

And apply this modification: https://www.b4x.com/android/forum/threads/download-huge-files-with-httputils2.30220/#post-175746

Giacomo · Feb 7, 2016

I try to compile this app " LargeFileDownload" but I always make the same mistake.
I already tried to reinstall B4A without result. ( and erase all Lib)

Erel · Feb 7, 2016

This example is based on Http library. Google has removed the required classes from their latest SDK.

You have two options:

1. Use an older version of android.jar that includes the required classes (platform 22-).
2. Switch to OkHttp instead. It should be simple to make the changes.

ArminKH · Feb 7, 2016

Giacomo said:
I try to compile this app " LargeFileDownload" but I always make the same mistake.
I already tried to reinstall B4A without result. ( and erase all Lib)

View attachment 41296

you should use okhttp instead httpclient or compile your project by api<= 22

editoooops @Erel is a bit faster

Giacomo · Feb 7, 2016

Ok GRAZIE

Erel · Feb 7, 2016

I've uploaded a new version which is based on OkHttp (first post).

Alisson · Feb 18, 2016

I have one url with file. Exemple:
http://www.site.com/rss/
How get the file in url and save to scard/

B4X:

#Region  Project Attributes
    #ApplicationLabel: B4A 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

Sub Process_Globals
    Private link1 As String = "http://www.site.com/rss/"
End Sub

Sub Globals
    Dim ProgressBar1 As ProgressBar
    Dim Label1 As Label
    Dim btnDownload As Button
    Dim btnCancel As Button
End Sub

Sub Activity_Create(FirstTime As Boolean)
    Activity.LoadLayout("1")
End Sub

Sub btnDownload_Click
    Dim dd As DownloadData
    dd.url = link1
    dd.EventName = "dd"
    dd.Target = Me
    CallSubDelayed2(DownloadService, "StartDownload", dd)
End Sub

Sub dd_Progress(Progress As Long, Total As Long)
    ProgressBar1.Progress = Progress / Total * 100
    Label1.Text = NumberFormat(Progress / 1024, 0, 0) & "KB / " & _
        NumberFormat(Total / 1024, 0, 0) & "KB"
End Sub

Sub dd_Complete(Job As HttpJob)
    Log("Job completed: " & Job.Success)
    Dim o As OutputStream
    o = File.OpenOutput(File.DirDefaultExternal, "file.xml", True)
    'File.Copy(File.DirRootExternal & "/Android","photo1.jpg",File.DirRootExternal & "","photo.jpg")
    File.Copy2(Job.GetInputStream, o)
    o.Close
    Job.Release
End Sub

Sub btnCancel_Click
    CallSubDelayed2(DownloadService, "CancelDownload", link1)
End Sub

Sub Activity_Resume

End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub

Thanks

Alisson · Feb 18, 2016

Solvetion:

B4X:

Log("Job completed: " & Job.Success)
     Job.Download("http://www.site.com/rss/")
           Dim out As  OutputStream
          out = File.OpenOutput(File.DirRootExternal,"file.xml",False)
           File.Copy2(Job.GetInputStream,out)
           out.Close
    Job.Release

Thanks

DonManfred · Feb 18, 2016

Alisson said:
Solvetion:

Code ok but out of correct context it is unuseable

Alisson · Feb 18, 2016

I change the code to:

B4X:

Dim job3 As HttpJob
        job3.Initialize("Job3", Me)
   job3.Download(link1)   
    End If
  
End Sub
Sub JobDone (Job As HttpJob)
   If Job.Success = True Then
       Job.Download(link1)
           Dim out As  OutputStream
          out = File.OpenOutput(File.DirRootExternal,"folder/"&s&".xml",False)
           File.Copy2(Job.GetInputStream,out)
           out.Close
   End If
   Job.Release
End Sub

Is correct ?

DonManfred · Feb 19, 2016

Alisson said:
Is correct ?

no. Sorry, i did not see your error before

1. The download Job start

B4X:

   Dim job3 As HttpJob
   job3.Initialize("Job3", Me)
   job3.Tag = s ' to be used in jobdone. Place here the number you want to have the resulting xml named with
   job3.Download(link1)

B4X:

Sub JobDone (Job As HttpJob)
   If Job.Success = True Then
      if job.jobname = "Job3" then
         Dim out As  OutputStream
         out = File.OpenOutput(File.DirRootExternal,"folder/"&job.tag&".xml",False)
         File.Copy2(Job.GetInputStream,out)
         out.Close
      end if
   End If
   Job.Release
End Sub

DonManfred · Feb 19, 2016

If you encounter still problems:

Create A NEW THREAD for your question please.

Alisson · Feb 19, 2016

DonManfred, thanks very much!

jazzzzzzz · Jun 19, 2016

I have okhttputilis2 linked in my project,will that conflicts to this lib? If yes how can I get download progress?

Erel · Jun 19, 2016

You have two options:
1. Remove OkHttpUtils2 and use these modules for all downloads. This code is based on OkHttpUtils2.
2. Rename the modules so they won't conflict with OkHttpUtils2. Make sure to update the code so it won't call HttpUtils2Service.

jazzzzzzz · Jun 19, 2016

Ok I will try..

Am using imagedownloder class for downloading now and is it possible to add this download progress there also?

Erel · Jun 19, 2016

jazzzzzzz said:
Am using imagedownloder class for downloading now and is it possible to add this download progress there also?

It is possible if you modify ImageDownloader code and integrate this code.

tuhatinhvn · Nov 5, 2016

How can i download multi file and manage it???

Erel · Nov 6, 2016

What do you mean with multi file?

Tempomaster · Jan 26, 2017

Hello,

the example works very well with small files. In my app you can download a large file (~42 Mb):

http://www.g-daehling.de/tempomaster/test.zip

It is very often several attempts to load the file completely. The criticism comes from very many users of the app. What can be the problem ?

Best regards,
Gunnar from Magdeburg in Germany

Android Tutorial Download huge files with HttpUtils2

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