Android Example [B4X] [B4XPages] Barcode Reader

Erel · Jul 21, 2020

B4A + B4i barcode reader.

Don't miss:

- #PlistExtra in B4i.
- Manifest code + #AdditionalJar in B4A

Depends on BCToast: https://www.b4x.com/android/forum/t...platform-custom-toast-message.111046/#content
(BCToast will be an internal library in the near future)

While the camera related code is platform specific, the main program logic can still be shared. In this case there isn't too much logic but in real usage the benefit of implementing it like this will be higher.

Requires Android 5+.

Supported formats:
B4A - https://developers.google.com/andro...d/gms/vision/barcode/Barcode#constant-summary
B4i - TYPE_QR, TYPE_UPCE, TYPE_39, TYPE_39Mod43, TYPE_EAN13, TYPE_EAN8, TYPE_93, TYPE_128, TYPE_PDF417

Updates:

B4i iBarcode v1.21 - Adds support for setting the scan window: https://www.b4x.com/android/forum/threads/ibarcode-library.47354/post-836360

Mark Thorndyke · Aug 11, 2020

Liking this and quick change getting all bar-codes required.
Surprised you've not used the new Toast in the CameraExClass class

imbault · Sep 4, 2020

Thanks you @Erel for this very interesting project :

I'd like to add to switch button to disable/enable barecode capture while continuing previewing but how to stop BC capturing and resuming BC capturing in the code ?

Thanks a lot

Patrick

Erel · Sep 6, 2020

Add a flag variable and use it to ignore the Preview event.

B4X:

'I don't remember the event signature ( )
If DontCapture Then Return

dws · Sep 22, 2020

After version 10.2 Error when press then start button. What is wrong ?
In version 9.80 working fine.

b4xmainpage$ResumableSub_StartCameraresume (java line: 258)
java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/core/content/ContextCompat;
at anywheresoftware.b4a.objects.RuntimePermissions.Check(RuntimePermissions.java:73)
at anywheresoftware.b4a.objects.RuntimePermissions.CheckAndRequest(RuntimePermissions.java:97)
at b4a.cambarcodereader.b4xmainpage$ResumableSub_StartCamera.resume(b4xmainpage.java:258)
at b4a.cambarcodereader.b4xmainpage._startcamera(b4xmainpage.java:235)
at b4a.cambarcodereader.b4xmainpage._btnstartstop_click(b4xmainpage.java:76)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.BA.raiseEvent2(BA.java:213)
at anywheresoftware.b4a.BA.raiseEvent(BA.java:193)
at anywheresoftware.b4a.objects.ViewWrapper$1.onClick(ViewWrapper.java:80)
at android.view.View.performClick(View.java:7161)
at android.view.View.performClickInternal(View.java:7138)
at android.view.View.access$3500(View.java:811)
at android.view.View$PerformClick.run(View.java:27419)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:224)
at android.app.ActivityThread.main(ActivityThread.java:7548)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)
Caused by: java.lang.ClassNotFoundException: androidx.core.content.ContextCompat
... 20 more
*** Service (starter) Create ***
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **

josejad · Sep 22, 2020

Have you just installed 10.2? Or have you followed the instructions? Have you updated the SDK as described?

Erel · Sep 23, 2020

José J. Aguilar said:
Or have you followed the instructions? Have you updated the SDK as described?

No. The error happens because AndroidX sdk is missing.

Carefully follow these instructions: https://www.b4x.com/b4a.html

LucaMs · Oct 3, 2020

I tried it on some barcodes without success.

I had to replace:

B4X:

CreateDetector (Array("CODE_128", "CODE_93", "QR_CODE"))

with:

B4X:

CreateDetector (Array("AZTEC", "CODE_128", "CODE_39", "CODE_93", "CODABAR", "DATA_MATRIX", "EAN_13", "EAN_8", "ITF", "PDF417", "QR_CODE", "UPC_A", "UPC_E"))

I don't know if it actually recognizes all those types but the ones I tried previously are now recognized.
B4A ONLY

Xfood · Oct 3, 2020

is there any way to enable pointer while reading code?

amorosik · Oct 3, 2020

In one-dimensional codes, it only reads them if they are arranged horizontally or vertically
It is a limit to know otherwise you risk not being able to read even the barcodes that the program would be able to decode
This seems a bit strange to me because, graphically speaking, even the two-dimensional ones are actually sequences of one-dimensional codes placed one on top of the other.
And if he reads the qr-code at 45 degrees with respect to the lens, it means that he has the ability to read diagonally.

pacpinto · Oct 8, 2020

amorosik said:
In one-dimensional codes, it only reads them if they are arranged horizontally or vertically
It is a limit to know otherwise you risk not being able to read even the barcodes that the program would be able to decode
This seems a bit strange to me because, graphically speaking, even the two-dimensional ones are actually sequences of one-dimensional codes placed one on top of the other.
And if he reads the qr-code at 45 degrees with respect to the lens, it means that he has the ability to read diagonally.

Hi, I have exactly the same issue. Any ideas would be very welcome. I have a use case where this makes a difference. Thank you in advance.

Erel · Oct 8, 2020

The actual reading is done by Google SDK. Narrowing down the list of detectors might improve its performance.

Pepebis · Oct 11, 2020

Hello.
An example is working. But when I'm trying to use it my B4x pages I have a problem.

B4X:

java.lang.reflect.InvocationTargetException

pointing on line with line

B4X:

builder.InitializeNewInstance("com/google/android/gms/vision/barcode/BarcodeDetector.Builder".Replace("/", "."), Array(ctxt))

I have change manifest, i don't understand if I'm doing it correctly because after changes and trying to open the app manifest going back to previous state. I'm adding this line inside manifest.

B4X:

<meta-data
            android:name="com.google.android.gms.vision.DEPENDENCIES"
            android:value="barcode,face" />

Also as per instruction can't find jar file .

Don't miss:

- #PlistExtra in B4i.
- Manifest code + #AdditionalJar in B4A

DonManfred · Oct 11, 2020

Pepebis said:
<meta-data android:name="com.google.android.gms.vision.DEPENDENCIES" android:value="barcode,face" />

Use two comma

<meta-data android:name="com.google.android.gms.vision.DEPENDENCIES" android:value="barcode,,face" />

Pepebis · Oct 11, 2020

something is wrong. before opening b4a I'm changing this line adding that line with meta ( I'm using notepad to modify this file ) then after running app manifest removing that line which i added before. The manifest file which I'm changing is in b4->objects->AndroidManifest

DonManfred · Oct 11, 2020

Pepebis said:
I'm using notepad to modify this file

??? WHAT?

The correct place to edit the content of the Manifest is to use the Manifesteditor.

vmag · Oct 11, 2020

This is probably the best example for scanning barcodes! A minimum of code, and if you have the latest version of b4a, then no dancing with a tambourine is required. Thank you to the developers!

Pepebis · Oct 11, 2020

OK. I have change it , but still . I think I'm missing that jar file .

DonManfred · Oct 11, 2020

Pepebis said:
OK. I have change it , but still . I think I'm missing that jar file .

Go agaiun over the Tutorial, edit your project as needed.

Don't miss:

- #PlistExtra in B4i.
- Manifest code + #AdditionalJar in B4A

Pepebis · Oct 11, 2020

I'm sorry i don't understand what does it mean ?

#AdditionalJar in B4A

Android Example [B4X] [B4XPages] Barcode Reader

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