B4A Library Barcode reader based on Google Play Services Vision

[Micholl]

Hello Erel,
sorry - just discovered another strange behaviour:
It seems that the result array of barcodes in Camera1_Preview always returns
all recognised barcodes - not necessary only those which are currently seen
(when I cover 1 of 3 barcodes I always get the payload of 3 barcodes back).
Should this array be new initialized from preview to preview?

Thank you, Michael

 

[Erel]

Should this array be new initialized from preview to preview?

No. It is returned from the detector.

I don't see this behavior here. It only returns the currently detected barcodes.

 

[Erel]

New version was uploaded. The detected rectangle is drawn.

I've locked the orientation to landscape to make it simpler.

 

[john1in2]

Hi, I am very new to this- I can successfully use this to read bar codes, but the image/scanning window stays on all the time. How to you exit from the image/preview panel to another screen after a successful detection?

For example after a bar code is detected, add it to a list and switch to another panel that shows the list of bar codes that you have captured, with a button which allows you back to the bar code detection preview

 

[Erel]

Please start a new thread for this question.

 

[Juanmavalero]

Hello, the proyect sample put me this library error: Artefacto de Maven no encontrado: com.google.android.gms/play-services-vision

 

[Erel]

Make sure to use B4A Sdk Manager to manage Android SDK. It will work.

 

[Juanmavalero]

Make sure to use B4A Sdk Manager to manage Android SDK. It will work.

Thanks you, I did It and It work ok, excuse my inexperience

 

[Beja]

Hi Erel,

Back to this post.. today I tried it and I found it the same as the camera example.. it didn't raise an event or returned the detected barcode value.
am I missing something? Is it possible that you limit the example just to the barcode..
Thank you

 

[DonManfred]

Is it possible that you limit the example just to the barcode..

The Example is configured for

Sub Activity_Create(FirstTime As Boolean)
    Activity.LoadLayout("1")
    If FirstTime Then
        CreateDetector (Array("CODE_128", "CODE_93"))
    End If
    cvs.Initialize(pnlDrawing)
End Sub

CODE_128 and CODE_93 Barcodes. You may add other possible Values to the Array.
Check the Google Documentation for a list

Edit to Add:
RTFM In #1 is a Link: https://developers.google.com/andro...d/gms/vision/barcode/Barcode#constant-summary

 

[uniplan]

I try it but I have:
"Is detector operational: false" and I'm not able to scan barcode.

 

[Erel]

Which formats have you passed to CreateDetector?

Was the device connected to the internet when you tested it? It might need to download some data.

https://developers.google.com/andro...ector.Detections.html#detectorIsOperational()

 

[uniplan]

Which formats have you passed to CreateDetector?

Was the device connected to the internet when you tested it? It might need to download some data.

https://developers.google.com/andro...ector.Detections.html#detectorIsOperational()

I try:

CreateDetector (Array("CODE_128", "CODE_93"))
CreateDetector (Array("ALL_FORMATS"))
CreateDetector (Array("EAN_13"))

but I have all the same result.

Yes the device was connected to the internet when I tested.

 

[Roberto P.]

Hello to all
why this example does not work with a Samsung Tab S4 tablet?
thank you
roberto

 

[Erel]

What happens when you run it?

 

[Roberto P.]

Nothing is happening. With the smartphone it reads the barcodes automatically.

 

[Erel]

Have you checked the logs for any error?

 

[Roberto P.]

of course. does nothing.
It almost seems like you do not hear the camera. while, if I click the photo works.

 

[Erel]

If you are not seeing the preview feed then the problem is related to the camera. Worth trying the default camera example. See if it works.

 

[Roberto P.]

I see the video, but the event that intercepts the reading of the bar code does not start. I ran the same app on both smartphones and tablets. only difference I see is that the app asks me to confirm access to the camera the tablet no.