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.

DonManfred · Jan 26, 2017

Please start a new thread in the questionsforum for this issue.
Make sure to upload a sample projekt which shows the issue.

Tempomaster · Jan 26, 2017

I have tested the file with the example from post # 1 in this thread (I just changed the url). The problem occurs. It has nothing to do with my app.

The new url:

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

DonManfred · Jan 26, 2017

i downloaded the sample, changed the url to yours.
Out of three runs i got

LogCat connected to: 9885e6514556383552
--------- beginning of main
--------- beginning of system
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
** Service (downloadservice) Create **
** Service (downloadservice) Start **
** Service (httputils2service) Create **
** Service (httputils2service) Start **
** Activity (main) Pause, UserClosed = false **
** Activity (main) Resume **
** Activity (main) Pause, UserClosed = false **
** Activity (main) Resume **
java.net.ProtocolException: unexpected end of stream
Job completed: false
Job completed: true
Job completed: true

but it works at least....

ibra939 · Jan 26, 2017

Gunnar Daehling said:
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

i dont know why not download with me ? is the file full

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

Tempomaster · Jan 26, 2017

DonManfred said:
i downloaded the sample, changed the url to yours.
Out of three runs i got

but it works at least....

But too often not. A download should actually always work reliably.

DonManfred · Jan 26, 2017

I´ve changed the url to a file on my webspace.
It has just finished the third download of a 101mb file successfully.

Note that network errors can happen due to bad internet connection, other network problems.

Tempomaster · Jan 26, 2017

DonManfred said:
I´ve changed the url to a file on my webspace.
It has just finished the third download of a 101mb file successfully.

Note that network errors can happen due to bad internet connection, other network problems.

I think that is not the reason. Too many users of the app report the error. Downloading this file with other apps works reliably. There are other solutions in B4A ?

ibra939 · Jan 26, 2017

DonManfred said:
I´ve changed the url to a file on my webspace.
It has just finished the third download of a 101mb file successfully.

Note that network errors can happen due to bad internet connection, other network problems.

the file note wotking i download it show my this

Please re-upload the file i need to check it

ibra939 · Jan 27, 2017

Gunnar Daehling said:
I think that is not the reason. Too many users of the app report the error. Downloading this file with other apps works reliably. There are other solutions in B4A ?

DonManfred said:
I´ve changed the url to a file on my webspace.
It has just finished the third download of a 101mb file successfully.

Note that network errors can happen due to bad internet connection, other network problems.

where the new file URL we need the file to test it ???

Tempomaster · Jan 27, 2017

ibra939 said:
the file note wotking i download it show my this

Please re-upload the file i need to check it

The file is ok. The screenshot shows the content of the zip file. The download routine from post #1 does not work reliably.

aidymp · Jan 27, 2017

Gunnar Daehling said:
The file is ok. The screenshot shows the content of the zip file. The download routine from post #1 does not work reliably.

Maybe I can shed some light on this, I had the same problem! i wrote an app for a client in China, the app was fine running it in the UK, they said the app did not work! download kept failing, so after lots of tests it appeared that most servers seem to stall if only for a few milliseconds, this doesn't cause any problems for most programs or web browsers however this method is seems to fail instantly. I have since switched to an expensive VPS so i get this error very rarely. But it seems to have just resurfaced but only on Apple Mac's I use the same base code for my Android, PC and Mac app, all are fine, but i am getting download failures on Macs'

I did read there was a way to change the timeout, but its not supported with this method, maybe someone can advise if we can change the timeout on this routine?

Thanks

Aidy

Tempomaster · Jan 27, 2017

I solved the problem for myself. I found this library in this forum:

https://www.b4x.com/android/forum/threads/downloadmanager.22306/#post129464

An example of this is described here:

https://www.b4x.com/android/forum/threads/downloadmanager-tutorial.22307/#content

This solution works perfectly. Nevertheless thanks for your help.

Martin Larsen · Jun 6, 2017

Would we be better off using the new resumable subs and the Wait For construction instead of using this library?

Erel · Jun 6, 2017

No. You need to use CountingOutputStream as done in this code.

aidymp · Oct 5, 2018

Is this still current? or is there a newer method?

Sorry I'm recreating old projects so may ask this on a few threads, as the forum is getting a little cluttered with old news!

Thanks

Aidy

Erel · Oct 7, 2018

aidymp said:
Sorry I'm recreating old projects so may ask this on a few threads, as the forum is getting a little cluttered with old news!

Posting in old threads is a good way to add clutter. Please start a new thread in the questions forum.

Erel · Nov 18, 2019

Example updated with a new download link, updated targetSdkVersion and clearText attribute which is required as the download link is a non-SSL link.

Android Tutorial Download huge files with HttpUtils2

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