B4A Library ZXingLib by icefairy333 - modified by Johan Schoeman (Scan QR Codes and other 1D/2D Barcodes)

Johan Schoeman · Jan 7, 2015

See the attached project (with library files in the /files folder of the project). This is based on the original work of @icefairy333. I have modified @icefairy333's library so that it can do the following:

1. Set the color of the border of the framing rectangle from B4A code
2. Set the color of the laser from B4A code
3. Set the color of the mask around the framing rectangle from B4A code
4. Set the color of the result points from B4A code
5. Set the color of the final panel being displayed before control is being returned to the B4A project from B4A code
6. Ability to switch on/off the torch when making use of the back camera scanner by means of the volume up/down buttons. Use the volume up/down buttons to toggle the torch on/off when the scanner is active.

a. It retains the Portrait /Landscape option as per @icefairy333 's version 1.5 posted in post #1 of his original post.
b. It retains use of the front / back camera (not sure if it supports all types of devices)

See post #5 for changes that might be required to the Manifest of the project.

Edit: Posting JohanIceFairyZxingWidthMod.zip that will allow you to change the width / height of the ViewFinder. New library files are in the /files folder of the attached project. Replace the old lib files with the new ones.

Edit: Posting JohanIceFairyZxingWidthModAndTextMod.zip that will allow you also add text to the mask around the viewfinder of the scanner.

Edit: Posting JohanIceFairyZxingWidthTextBitmap.zip that will allow you to also add a bitmap to the mask around the viewfinder of the scanner.

Edit: Posting JohanIcefairyZxingWidthTextBitmapTouchTorch.zip that retains all previously added functionality but you can now also switch on/off the flash when using the back camera by either using the volume up/down buttons or just touch the screen while the scanner is active.

Edit: attached file src.zip contains the java source code. It can be compiled into a B4A library with Simple Library Compiler (SLC) as is, provided you set up the directory structure correctly and you set up SLC correctly. See elsewhere in this thread how to do it.

Edit: Attached JohanIcefairyZxingTimeout.zip with all the previously added functionality but adding an option to specify a timeout duration. Default timeout duration is 15 seconds (should you not specify any timeout duration). Also posting src_2.zip with the amended java source code

eg of Button1_Click for project in JohanIcefairyZxingTimeout.zip

B4X:

Sub Button1_Click
  zx.isportrait = True
  zx.useFrontCam = False

  'set the timeoutDuration to a very high value (such as 2000000000) if you dont want it to time out
  '2000000000 = 63 years+
  zx.timeoutDuration = 30

  'change these factors between 0 and 1 to change the size of the viewfinder rectangle
  'the library will limit the minimum size to 240 x 240 pixels and the maximum to (screen width) x   (screen height) pixels
  zx.theViewFinderXfactor = 0.7
  zx.theViewFinderYfactor = 0.5

  zx.theFrameColor = Colors.Blue
  zx.theLaserColor = Colors.Yellow
  zx.theMaskColor = Colors.argb(95, 0, 0, 255)
  zx.theResultColor = Colors.Green
  zx.theResultPointColor = Colors.Red

  'set the prompt messages
  zx.theTopPromptMessage = "This was done......"
  zx.theTopPromptTextSize = 5%y'text size in pixels
  zx.topPromptColor = Colors.Red
  zx.topPromptDistanceFromTop = 1%y'pixel distance from top

  zx.theBottomPromptMessage = "Just for fun......"
  zx.theBottomPromptTextSize = 5%y'text size in pixels
  zx.bottomPromptColor = Colors.Blue
  zx.bottomPromptDistanceFromBottom = 5%y'pixel distance from top

  'add a bitmap
  zx.theBitMap = bm
  zx.theBitMapLeft = 40%x
  zx.theBitMapTop = 10%y
  zx.theBitMapWidth = 20%x
  zx.theBitMapHeight = 20%x

  zx.BeginScan("myzx")
End Sub

Enjoy!

DonManfred · May 18, 2020

joe.dai said:
Can you guide me to add those permissions?

Runtime Permissions (Android 6.0+ Permissions)

1. Edit: In B4XPages the permission result event signature is: Wait For B4XPage_PermissionResult (Permission As String, Result As Boolean) 2. Important to read: https://www.b4x.com/android/forum/threads/android-jar-targetsdkversion-minsdkversion.87610/#content If the targetSdkVersion is...

www.b4x.com

joe.dai · Jul 20, 2020

DonManfred said:
Runtime Permissions (Android 6.0+ Permissions)

1. Edit: In B4XPages the permission result event signature is: Wait For B4XPage_PermissionResult (Permission As String, Result As Boolean) 2. Important to read: https://www.b4x.com/android/forum/threads/android-jar-targetsdkversion-minsdkversion.87610/#content If the targetSdkVersion is...

www.b4x.com

Erel :
thank you ! runtime-permissions add is ok , Worked
but scan qrcode chinese result is garbled ,
how to fix mistakes ? Thanks for your help.

hatzisn · Jul 20, 2020

Maybe it is UTF-8 codes read wrong so you could write something like the following code:

B4X:

    Dim s As String
    's = QRCodeResult
    Dim b() As Byte
    b = s.GetBytes("ASCII")
    s = BytesToString(b,0,b.Length, "UTF8")

Xfood · Jul 20, 2020

compatible con el código farmacéutico32?

nice lib, you could add the reading Code 32 (Italian PHARMACODE)

Code 32 (Italian Pharmacode)

barcodeguide.seagullscientific.com

code 32 italian pharmacode
Thanks so much

joe.dai · Jul 21, 2020

hatzisn said:
Maybe it is UTF-8 codes read wrong so you could write something like the following code:

B4X:

Dim s As String 's = QRCodeResult Dim b() As Byte b = s.GetBytes("ASCII") s = BytesToString(b,0,b.Length, "UTF8")

hi hatzisn

not work !! thanks

ivan.tellez · Jul 21, 2020

joe.dai said:
how to fix mistakes ?

No QR sample, No actual content of the scan result. no comparison with what is scanned with another app... It is a guessing contest?

You can try to debug and see what is the binary content of the result and work from there.

joe.dai · Jul 28, 2020

ivan.tellez said:
No QR sample, No actual content of the scan result. no comparison with what is scanned with another app... It is a guessing contest?

You can try to debug and see what is the binary content of the result and work from there.

hatzisn said:
Maybe it is UTF-8 codes read wrong so you could write something like the following code:

B4X:

Dim s As String 's = QRCodeResult Dim b() As Byte b = s.GetBytes("ASCII") s = BytesToString(b,0,b.Length, "UTF8")

i change new library is ok !!

thanks all

loonet · Dec 8, 2020

Thanks Johan Schoeman for yoyr great job.
Using the libraries 1.05 and 1.06 I obtain the following exception when scanning a Qr code or every normal barcode.
How can I solve it ?

Is it possible to send the scan result to a EditText positioned on the same activity of the scan button ?

DonManfred · Dec 9, 2020

loonet said:
How can I solve it ?

1. You should NEVER post to existing threads. Always create a new thread in the questionsforum for any question/issue you have.
2. You should post errors as TEXT (right click to copy)
3. You need to provide more informations. As the error is telling about a wrong event_signature. But you are giving ZERO Info how your code looks like. Especially the Event_signature

Gorgulho Junior · Mar 25, 2022

Hello Johan

First, I apologize for my English. I just signed up for the B4X Programming Forum and I don't know if I'm contacting you correctly (I couldn't find your email address).

I did tests with your example of QrCode detection and liked the result. I made a donation through PayPal (Transaction ID: 7SR3134370589415D) and would like to know how to remove protection to use it in a personal use application.

Congratulations for your work and for the interaction with the other members.

Thanks.

Johan Schoeman · Mar 26, 2022

Thank you for the donation.

Please explain what "protection" you are referring to? There is no protection. It is free to use.

Gorgulho Junior · Mar 26, 2022

Johan Schoeman said:
Thank you for the donation.

Please explain what "protection" you are referring to? There is no protection. It is free to use.

Hello Johan

I will reply in the private message you sent me. It must probably be something wrong I did as I am new to B4A.

Thanks.

OMS · Nov 22, 2025

Hi Johan,

First of all thank you so much for your excellent ZXing library — it’s one of the most popular and reliable barcode scanners in the B4A community for years.

I’m working on a project where I need to scan multiple barcodes from a static image (gallery/file) in addition to live camera scanning.
I’ve already managed to add this feature to an older/forked version, but I would really prefer to keep using your latest official version and just add this small enhancement myself.

Would you be kind enough to share the latest source code of jhsicezxing1 (or point me to the GitHub repo if it exists)?

I will only use it to:

• add the image-scanning feature

• keep all your credits and authorship unchanged

• publish the modified version here in the forum (as a free updated version for the whole community, with your full name and credit of course)

Thank you in advance for your time and for all the great work you’ve done for the B4A community!

Best regards,

Johan Schoeman · Nov 22, 2025

OMS said:
Hi Johan,

First of all thank you so much for your excellent ZXing library — it’s one of the most popular and reliable barcode scanners in the B4A community for years.

I’m working on a project where I need to scan multiple barcodes from a static image (gallery/file) in addition to live camera scanning.
I’ve already managed to add this feature to an older/forked version, but I would really prefer to keep using your latest official version and just add this small enhancement myself.

Would you be kind enough to share the latest source code of jhsicezxing1 (or point me to the GitHub repo if it exists)?

I will only use it to:

• add the image-scanning feature
• keep all your credits and authorship unchanged
• publish the modified version here in the forum (as a free updated version for the whole community, with your full name and credit of course)

Thank you in advance for your time and for all the great work you’ve done for the B4A community!

Best regards,

Will post the source later today. Just past midnight here and now going be be horizontal for a few hours

OMS · Nov 25, 2025

Hi Johan,

Just a gentle reminder about the source code you kindly offered to post.
No rush at all – just checking if you’ve had a chance yet.
Really appreciate your help and all the great work you’ve done for the community!

Thanks again,
Oliver Mallowes (oms336)

Johan Schoeman · Nov 25, 2025

OMS said:
Hi Johan,

Just a gentle reminder about the source code you kindly offered to post.
No rush at all – just checking if you’ve had a chance yet.
Really appreciate your help and all the great work you’ve done for the community!

Thanks again,
Oliver Mallowes (oms336)

Attached the last version as what I have it...

Mark Stuart · Dec 15, 2025

I notice there are a couple of barcode scanning/reading libraries that Johan has published.

I'm wondering which one is a better choice for an app I'm re-building that does an inventory scan count?

The scan must have a very quick scan response of the barcode as there are many items that need to be scanned and counted.
The barcode is a Code 128. It looks like Johans library already reads that type.

When the app is running and using the scanning, will the keyboard still be available to the user?

I probably have more questions, but my requirements are for a very responsive barcode read. Currently, the scanning process in the existing app I built uses an attached HP scanner. It works great but I would like an all-in-one solution that allows the user to have a free hand.

So which library is a better fit?

Regards,
Mark Stuart

OMS · Dec 20, 2025

Hi Mark,
This library launches a separate activity (opening/closing camera each time), it might not be ideal for fast continuous Code 128 scanning in inventory apps.
Better options for embedded, continuous scanning (camera stays open, keyboard/input fields remain accessible):

1. **Embedded ZXing-based scanners** (like Johan's older ones):
- https://www.b4x.com/android/forum/threads/codescanner-100-embedded-in-b4a.90176/
- Or: https://www.b4x.com/android/forum/t...de-scanner-that-is-100-embedded-in-b4a.63764/
These run in a view/panel, support continuous mode, and you can restrict to 1D formats (including Code 128) for maximum speed.

2. **Google ML Kit / Code Scanner** (often the fastest on modern devices):
- https://www.b4x.com/android/forum/t...n-very-simple-to-use-barcode-scanning.160725/
It's very quick for Code 128 and supports continuous scanning well.
Note: It sometimes has issues on older devices or where Google Play Services aren't fully up-to-date (e.g., regional restrictions), so test it on your target devices.

If you need hands-free scanning while entering other data, the embedded options above are usually the way to go.

Good luck!

B4A Library ZXingLib by icefairy333 - modified by Johan Schoeman (Scan QR Codes and other 1D/2D Barcodes)

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