Qr : Read and Create Qr/Bar Code offline

[vknow360]

1.Introduction

Recently there were some topics(on Kodular Community) about generating qr code offline and storing on device and I got inspiration/idea to create Qr extension.
Don’t go on name…it is not only related to Qr Code but also to Bar Code.It can generate and read Qr Code and Bar Code when you are offline besides when you are online.
Latest Version: 5.1
Released:2020-03-20T18:30:00Z
Last Updated: 2021-06-23T18:30:00Z

2.Blocks

Just 3 method and 2 event blocks

3.Documentation

A short documentation for the extension-

Creates BarCode and raises event 'BarCodeGenerated' with response and filepath
Note: File Path should be absolute like /storage/sdcard/qr.png

Decodes BarCode and raises event 'BarCodeDecoded' with result

Returns a list of supported Bar code formats which can be either decoded or encoded

4.Downloads

Aix can be found here:

vknow360/Qr

Thank you

[TIMAI2]

Thank you. However:

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unlisted until corrected…

[ZonaKyle]

Hi! I've almost got this working I think. The block of code below prints a "file not found" error into the text box. Do you know what I'm missing?

[Taifun]

use Do it to debug your blocks, see also tip 4 here https://puravidaapps.com/learn.php
see also Live Development, Testing, and Debugging Tools
Taifun

---

Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by Taifun.

[vknow360]

Hi @ZonaKyle Welcome
Probably because file you want to decode does not exists.
Be sure to check if it exists or not before decoding.
Also you can find latest version here:

Qr : Read and Create Bar Code offline

[vknow360]

ChangeLog Version 4

Changes

• Added logoPath parameter in GenerateBarCode method
• Changed package name to com.sunny.qr from com.sunny.Qr
• The extension does not ask for any permission and uses absolute file paths

Download Link: com.sunny.qr.aix (14.0 KB)

Note: Still you will have to additionally use a BarcodeScanner component

Credits: I am thankful to @Ayoub_Dev for the source of QrLogo extension.

[TIMAI2]

Testing this in companion, I get a list of formats:

["AZTEC", "CODABAR", "CODE_39", "CODE_93", 
"CODE_128", "DATA_MATRIX", "EAN_8", "EAN_13", 
"ITF", "MAXICODE", "PDF_417", "QR_CODE", 
"RSS_14", "RSS_EXPANDED", "UPC_A", "UPC_E", 
"UPC_EAN_EXTENSION"]

However, only QR_CODE and PDF_417 generate an image/code.

Is there are reason for this?

(tested on Android 10 and Android 11 devices)

[vknow360]

That's a list of formats which can be either encoded or decoded (some formats support both).

@TIMAI2

only QR_CODE and PDF_417 generate an image/code.

CODE_39 should also work.

[TIMAI2]

Unfortunately Code_39 does not work either

[vknow360]

Maybe becuause of android version.

[Patryk_F]

@vknow360

Aia file>>

Download Link1: Qr.aia

This .aia is created in Kodular and is not compatible with AI2.

[Kumaraswamy]

@vknow360

Download Link3: Qr.aix - Mini URL

Ahh, please don't use that URL.

[vknow360]

@Patryk_F

This .aia is created in Kodular and is not compatible with AI2.

Here are the blocks:
Generate Bar Code

Decode Bar Code

[Patryk_F]

I made a test app:
QR.aia (15.0 KB)

Problem 1 - Created PNG file is empty.
Problem 2 - When I use ImagePicker to get a QR code from my phone, I get an error: com.google.zxing.NotFoundException.
Problem 3 - App crashes on startup after compiling, with companion works fine.

[vknow360]

@Patryk_F

Problem 1 - Created PNG file is empty.

Probably given logo does not exist.

@Patryk_F

Problem 2 - When I use ImagePicker to get a QR code from my phone, I get an error: com.google.zxing.NotFoundException.

Have you asked for WRITE_EXTERNAL_STORAGE permission?
Also I suggest you to not use ImagePicker.Selection block because it creates unnecessary temp files.You should use Activity Starter along with FileTools or TaifunFile extension.
See here how:

Problem viewing web page on custom web view

There was a small mistake in my blocks. [blocks (3)]

@Patryk_F

Problem 3 - App crashes on startup after compiling, with companion works fine.

You have not put a barcode scanner component.

This should work fine:
Qr.aia (33.2 KB)

[Patryk_F]

Yeah. I don't have a logo. I thought that made the logo :). What is a qr code logo?

Yes permission granted. ImagePicker returns the path to the created temporary file. The temporary file exists, so it should decode qr correctly. I work with ActivitiStarter later.

I did not know that a scanner is needed. I thought it was an independent extension

[vknow360]

@Patryk_F

What is a qr code logo?

Sometimes we want to decorate qr code with watermarks.That is it.

@Patryk_F

The temporary file exists, so it should decode qr correctly.

From where have you downloaded bar/qr code?

@Patryk_F

I did not know that a scanner is needed. I thought it was an independent extension

No, it needs some deps which are only available in Barcode Scanner component.

[Patryk_F]

What is the maximum length of the text that you can encode in QRCODE? With short text, the extension generate and decodes well. When the text is a long, QR code is generated correctly, while when decoding there is a COM.GOGLE.ZXING.NOTFOUNDEXCEPTION error. I will add that the scanner correctly decodes the QR code.

QrScan800.aia (54.5 KB)

Text:
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

QR:

Another thing is whether I can save the logo in the APP resources? I tried to give the path to the logo "http://localhost/logo.png" but it does not work.

[TIMAI2]

@Patryk_F

What is the maximum length of the text that you can encode in QRCODE?

QR code | Storage

[vknow360]

@Patryk_F

while when decoding there is a COM.GOGLE.ZXING.NOTFOUNDEXCEPTION error.

It means either:

• dimensions are larger than expected
• orientation has been changed
• some pixels have been lost

@Patryk_F

Another thing is whether I can save the logo in the APP resources? I tried to give the path to the logo "http://localhost/logo.png" but it does not work.

Usually extensions don't use that path.So // will work for assets.