Qr : Read and Create Bar Code offline

[vknow360 (Sunny Gupta)]

1.Introduction

Qr
Recently there were some topics about generating qr code offline and storing on device and thus I got idea to create Qr extension.
It basically creates and reads qr and bar codes offline from file.

Latest Version: 5.3
Released: 2020-03-20T18:30:00Z
Last Updated: 2024-06-10T18:30:00Z

2.Blocks

3.Documentation

A short documentation for the extension…

• Bar Code Decoded
  Event raised after decoding bar code with result and bar format
  
  result ~ text
  barFormat ~ text

• Bar Code Generated
  Event raised after GenerateBarCode method with response and filepath.If any error occurred during encoding then filePath value will be empty.
  
  response ~ text
  filePath ~ text

• Barcode Formats
  Returns a list of barcode formats which can be either encoded or decoded.Some formats can be encoded and decoded both like QR_CODE and CODE_39.
  
  **Returns : List< String >

• Decode Bar Code
  Tries to decode barcode from given path.
  
  filePath ~ text

• Generate Bar Code
  Generates barcode to given path with provided hints.
  
  
  
  text ~ text
  filePath ~ text
  logoPath ~ text
  height ~ int
  width ~ int
  fileFormat ~ text
  barFormat ~ text
  charset ~ text
  margin ~ int
  bgColor ~ int (Color)
  barColor ~ int (Color)

4.Downloads

Qr: Create and read barcodes offline – SunnyTheDeveloper

5.Credits

A lot of thanks to Kodular for this awesome platform

6.Updates/Bug Fixes

ChangeLog Version2

Bug Fixes/Changes

• Replaced relative filePath with abstract filePath in DecodeQrCode and DecodeBarCode methods.But both Generate methods still use relative filePath.

ChangeLog Version3

New methods

• Added BarcodeFormats method

Changes

• Removed some Qr related methods and events.Now you can generate qr using GenerateBarCode method by using QR_CODE as barFormat.
• Now it will automatically ask for Read and Write permissions if they are not granted/disabled.

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

ChangeLog Version 5

New blocks

Normally should not be used

Changes

• Removed redundant barFormat param from DecodeBarCode method
• Added barFormat param in BarCodeDecoded event

Bug Fixes

• Fixed assets logo issue in GenerateBarCode method

ChangeLog Version 5.1

New Blocks

This property forces encoder to use the specified shape
Accepted Values: NONE,SQUARE,RECTANGLE

Changes

• Auto scaling : bar codes will be now automatically scaled to match correct rotation according to height and width
• Some internal changes

ChangeLog Version 5.2

• Internal changes in reader method to increase its efficiency by a huge. Now, you can provide it a non-pure barcode which may have other objects too, and it’ll correctly read from there.
• BarCodeDecoded event’s parameters can be either a list or string now, based on number of barcodes found in the image. In short, it is possible to read multiple barcodes from an image.

ChangeLog Version 5.3

• No external deps required
• More accurate and faster results
• Aix sized reduced to 378 Kb

Hope it helps!

[salem_m_s2021 (salem)]

gooood

This is called creative works

[nikif99 (Nikiforos)]

Fine job. Thank you.

Do you know any litterature about the exact algorithm converting text to QR code and v.v? (not mean sites or programs which convert input text).
I know the pattern for one-dimensioned bar code (EAN-13). If you could suggest something about QR code it would help me.

[The_K_Studio (Karan M.)]

Awesome work…can u provide test aia?

[ShaikhSajidAli (Muhammed Sajid Ali)]

Read complete post aia is available

[The_K_Studio (Karan M.)]

Ohh yes. I was confused due to the download titles. In both titles there is…Aix

[The_K_Studio (Karan M.)]

After generating apk file with your aia and tried in Redmi note 5 pro, The app is crashes immediately…

[vknow360 (Sunny Gupta)]

Hi @The_K_Studio
It has been fixed and you can test it now.

[vknow360 (Sunny Gupta)]

@nikif99

Fine job. Thank you.

Your welcome.

@nikif99

Do you know any litterature about the exact algorithm converting text to QR code and v.v? (not mean sites or programs which convert input text).

Do you mean manual conversion?

[nikif99 (Nikiforos)]

I mean the mathematical pattern of how the position of little squares in the image are transformed to text and vv.
Like in EAN-13 bar code, the set of numbers are evaluated are trace vertical bars of a certain width, separated by blanks of a specified width.

[vknow360 (Sunny Gupta)]

Sorry…I have not so much deep knowledge
But this can be useful:

QR code

[nikif99 (Nikiforos)]

I was aware of it. It seems that algorithm of QR is much complicated than EAN-13. I didn’t manage to find any information more.
Anyway, thanks for your interest.

[The_K_Studio (Karan M.)]

I have granted permission…but

[vknow360 (Sunny Gupta)]

It is working for me…

Which android version are you using?

[The_K_Studio (Karan M.)]

Android 9, Redmi Note 5 Pro

[vknow360 (Sunny Gupta)]

Can you try it on another device?

[The_K_Studio (Karan M.)]

Same problem. Tried in Android 8

[Boban (Boban Stojmenovic)]

Something is not right with the permission as I get the same error however, adding ask for permission block make it works

[Lagu6 (Barraca Fútbol)]

Does anyone know how to use the external QR method? since the phone camera is not fast enough as the external reader.

[vknow360 (Sunny Gupta)]

Thank you @Boban
I will try to fix it as soon as possible