B4A Library RSAsyncDownloader - Download files asynchronously & easily!

Hi everyone,

I present to you my RSAsyncDownloader.
This will download any file very easy and asynchronously from a given URL.

B4X: 
Dim AsyncDownloader As RSAsyncDownloader
AsyncDownloader.Initialize("AsyncDownloader")
AsyncDownloader.FileName = "FileName.pdf"
AsyncDownloader.Directory = File.DirDefaultExternal
AsyncDownloader.Download("Your url here.")

3 Events are raised:

B4X: 
Private Sub AsyncDownloader_Started
'The download has started.
End Sub

Private Sub AsyncDownloader_Update (Progress As Int)
'Monitor the progress here.
End Sub

Private Sub AsyncDownloader_Finished (Result As String)
'The download has finished.
End Sub


Kind regards,
Tomas
 

Attachments

  • RSAsyncDownloader.zip
    6.6 KB · Views: 726
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B

billzhan

Active Member
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Longtime User
Tomas,

I played with if for a while. Really easy to use.

I may found a bug.On OS 2.3 and 4.1:
B4X: 
Private Sub AsyncDownloader1_Finished (Result As String)
Log(AsyncDownloader.Directory&"  "&AsyncDownloader.FileName)
End Sub
I got the log: /mnt/sdcard/ /mnt/sdcard/


Cheers,
Bill
 
Q

qsrtech

Active Member
Licensed User
Longtime User
hey what is the "result" suppose to return in the "Finished"? It would be nice if it was the complete dir and filename...
 
B

billzhan

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Longtime User
When the download is success,Result= Null.
Before downloading,you need to set the file name and path to this download. See the #1 post:
B4X: 
AsyncDownloader.FileName = "FileName.pdf"
AsyncDownloader.Directory = File.DirDefaultExternal

You can get the file name and directory anywhere by:
B4X: 
Directory=AsyncDownloader.Directory
FileName=AsyncDownloader.FileName
 
Q

qsrtech

Active Member
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Longtime User
I'm getting a Null pointer error when re-downloading my file. First time works fine but get this when trying again. have to totally close app get d/l to work again.
at com.rootsoft.rsasyncdownloader.DownloadTask.onPreExecute(DownloadTask.java:102)
 
B

billzhan

Active Member
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Longtime User
I am quite sure that you need to initialize(initialize,filename,directory) your AsyncDownloader every time before you restart a download, else an error will occur.
B4X: 
AsyncDownloader.Initialize("AsyncDownloader")
AsyncDownloader.FileName = "FileName.pdf"
AsyncDownloader.Directory = File.DirDefaultExternal
AsyncDownloader.Download("Your url here.")
 
Q

qsrtech

Active Member
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Longtime User
I did try initialize again but I didn't reset the filename, etc. I'll let you know if the filename makes any difference.
 
S

susu

Well-Known Member
Licensed User
Longtime User
I need help about RSAsyncDownloader.LoadBitmap method. My code here:

B4X: 
Dim downloader As RSAsyncDownloader
Dim img As ImageView

downloader.Initialize("downloader")
img.Initialize("")
Activity.AddView(img, 0, 10dip, Activity.Width, 300dip)
img.Gravity = Gravity.FILL
img.Bitmap = downloader.LoadBitmap("http://www.b4x.com/new_images/b4a_logo.png")

It works perfect if I compile in Debug (rapid) mode, I can see B4A logo but when I compile in Release/Release (obfuscated) mode, there's no image. Especially, when I compile in Debug (legacy) mode, it stops at line:
img.Bitmap = downloader.LoadBitmap("http://www.b4x.com/new_images/b4a_logo.png")
with LastException error: java.lang.NullPointerException

Tomas, could you please check it? Thank you so much.
 
aminoacid

aminoacid

Active Member
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Longtime User
Works great. Thanks!

Just wondering why the "Prevent phone from Sleeping" feature is enabled. When I use your library and install my APP, I get a message from APP Permissions "xxx needs access to: System Tools - Prevent phone from sleeping".

Any way to not require this permission?

Thanks.
 
dibb3386

dibb3386

Member
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Old topic but just using this now, (if right might help others searching) @amin If downloading and phone went in to sleep status, wouldn't the download be interrupted? Especially with wifi if the phone/tablet is configured to turn off wifi when in sleep mode. Or even power saving mode on some devices. This would prevent this from happening.
 
Devv

Devv

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Longtime User
thanks fro this nice lib
it is working nicely except with the following code it will not toast the progress

B4X: 
Sub Activity_Create(FirstTime As Boolean)
    'Do not forget to load the layout file created with the visual designer. For example:
    'Activity.LoadLayout("Layout1")
    Dim AsyncDownloader As RSAsyncDownloader
    AsyncDownloader.Initialize("AsyncDownloader")
    AsyncDownloader.FileName = "test.apk"
    AsyncDownloader.Directory = File.DirRootExternal
    AsyncDownloader.Download("http://downloader-apk.com/apps/2015/02/19/WhatsApp_Messenger%202.11.528_[www.Downloader-Apk.com].apk")
End Sub

Sub Activity_Resume

End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub


Private Sub AsyncDownloader_Started
ToastMessageShow("The download has started.",False)
End Sub

Private Sub AsyncDownloader_Update (Progress As Int)
ToastMessageShow(Progress,False)
End Sub

Private Sub AsyncDownloader_Finished (Result As String)
ToastMessageShow("The download has finished.",False)
End Sub


this is very wired if you placed any url instead of the flowing it will work

any ideas ?
 
jahswant

jahswant

Well-Known Member
Licensed User
Longtime User
I'm trying to download multiple files here with no success is it possible?
B4X: 
** Activity (download) Pause, UserClosed = true **
** Activity (main) Create, isFirst = false **
** Activity (main) Resume **
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
** Activity (main) Pause, UserClosed = true **
** Activity (download) Create, isFirst = true **
** Activity (download) Resume **
The download has finished.null
download_downbtn2_click (java line: 428)
java.lang.IllegalStateException: Cannot execute task: the task has already been executed (a task can be executed only once)
    at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:578)
    at android.os.AsyncTask.execute(AsyncTask.java:534)
    at com.rootsoft.rsasyncdownloader.RSAsyncDownloader.Download(RSAsyncDownloader.java:48)
    at in.liam.music.download._downbtn2_click(download.java:428)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:525)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:187)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:175)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:171)
    at anywheresoftware.b4a.objects.ViewWrapper$1.onClick(ViewWrapper.java:78)
    at android.view.View.performClick(View.java:4229)
    at android.view.View$PerformClick.run(View.java:17629)
    at android.os.Handler.handleCallback(Handler.java:800)
    at android.os.Handler.dispatchMessage(Handler.java:100)
    at android.os.Looper.loop(Looper.java:194)
    at android.app.ActivityThread.main(ActivityThread.java:5413)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:525)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:834)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
    at dalvik.system.NativeStart.main(Native Method)
java.lang.IllegalStateException: Cannot execute task: the task has already been executed (a task can be executed only once)
 
Last edited:
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