Android Code Snippet Download image or file from a website

Erel · Mar 30, 2014

Edit: It is recommended to use this code instead: [B4X] OkHttpUtils2 with Wait For

Description: Download an online image and show it as the activity background.

B4X:

Dim job As HttpJob
job.Initialize("j", Me)
job.Download(<link>)

Sub JobDone(job As HttpJob)
   If job.Success Then
     'we can check the of value job.JobName if there is more than one job
     Activity.SetBackgroundImage(job.GetBitmap)
   Else
     Log("Error: " & job.ErrorMessage)
   End If
   job.Release
End Sub

Depends on HttpUtils2 library

Description: Download an online file and copy it to the external storage.

B4X:

Dim job As HttpJob
job.Initialize("j", Me)
job.Download(<link>)

Sub JobDone(job As HttpJob)
   If job.Success Then
     Dim out As OutputStream = File.OpenOutput(File.DirRootExternal, "filename.dat", False)
     File.Copy2(job.GetInputStream, out)
     out.Close '<------ very important
   Else
     Log("Error: " & job.ErrorMessage)
   End If
   job.Release
End Sub

Tags: download, http, httputil2, web

Erel · Aug 24, 2014

You will only see the logs in debug mode with B4A-Bridge (and Android 4.1+).

zeuspower · Aug 24, 2014

oops ! Thanks ...

ibra939 · Oct 7, 2014

no simple example ?

DonManfred · Oct 7, 2014

ibra939 said:
no simple example ?

See Post #1

ilan · Oct 7, 2014

DonManfred said:
See Post #1

i think he would like to see a project file...

DonManfred · Oct 7, 2014

ilan12041981 said:
i think he would like to see a project file...

Then he should make his own project-file! I´m NOT here to do the work for any lazy member...

The code in #1 is enough to do it.
libra939 is member since Jul 7, 2014 and he should be able to do that. If not then i suggest reading the beginners guide or have a look at other examples here in forum. There are hundreds of httputils-examples here, right?

ilan · Oct 7, 2014

DonManfred said:
Then he should make his own project-file! I´m NOT here to do the work for any lazy member...

The code in #1 is enough to do it.
libra939 is member since Jul 7, 2014 and he should be able to do that. If not then i suggest reading the beginners guide or have a look at other examples here in forum. There are hundreds of httputils-examples here, right?

i agree with you ...

ibra939 · Oct 7, 2014

ilan12041981 said:
i agree with you ...

haha oky

sergiones · Oct 26, 2016

Hi Erel, I know this is an old thread but I'm searching this forum for hours and this post is very near for what I need. I want to download xlsx and pdf from a website that requires cookies. Using cookiemanager I extracted the cookies and sent to job1 using getrequest.setheader.

When JobDone is concluded (succesfully, and I have a server confirmation that the download was made so cookie is okay) I get the problem.

My Url is http://example.com/download?someparameter&id=555

Using the method:

B4X:

Dim out As OutputStream = File.OpenOutput(File.DirRootExternal, "filename.dat", False)

How can I know the filename (and extension?)

Thank you!

DonManfred · Oct 26, 2016

sergiones said:
How can I know the filename (and extension?)

The link you provided does not show a filename... You need to get the filename on another way...

sergiones · Oct 26, 2016

DonManfred said:
The link you provided does not show a filename... You need to get the filename on another way...

Thank you Don, browsers can read the server filename using this same url, maybe some other way to achieve this?

I need to download this files using two cookies. What is the best way to do this?

DonManfred · Oct 26, 2016

You can try okhttputils2 sourcecode version and check if the result contains any headers you can get this information from.

You can get the source here https://www.b4x.com/android/forum/threads/okhttp-replaces-the-http-library.54723/#content

In sub ResponseSuccess you then can get the headers....

B4X:

Sub hc_ResponseSuccess (Response As OkHttpResponse, TaskId As Int)
    Response.GetAsynchronously("response", File.OpenOutput(TempFolder, TaskId, False), _
        True, TaskId)
       
       dim m as map = Response.GetHeaders
End Sub

check the Map m if it contains your filename....

Erel · Oct 26, 2016

Please start a new thread for this question.

sergiones · Oct 26, 2016

DonManfred said:
You can try okhttputils2 sourcecode version and check if the result contains any headers you can get this information from.

You can get the source here https://www.b4x.com/android/forum/threads/okhttp-replaces-the-http-library.54723/#content

In sub ResponseSuccess you then can get the headers....

B4X:

Sub hc_ResponseSuccess (Response As OkHttpResponse, TaskId As Int) Response.GetAsynchronously("response", File.OpenOutput(TempFolder, TaskId, False), _ True, TaskId) dim m as map = Response.GetHeaders End Sub

check the Map m if it contains your filename....

Thank you Don. I'm not sure if it works since the example requires a filename before the Success event. As asked by Erel I will create a new thread for this problem. Thanks.

Android Code Snippet Download image or file from a website

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