B4A Library Digital Ink Recognition based on ML Kit

Erel · Sunday at 11:24 AM

This is a B4A class that wraps ML Kit digital ink recognition. More information here: https://developers.google.com/ml-kit/vision/digital-ink-recognition

This feature has a large set of dependencies. I recommend starting with a simpler feature such as this one: https://www.b4x.com/android/forum/threads/b4x-textrecognition-based-on-mlkit.161210/#content
Once you get it working you can continue with the digital ink feature.

Open B4A Sdk Manager and install the following resources (you might need to install a few more resources. If you get a "missing module" during compilation then install it):

B4X:

androidx.work:work-gcm
androidx.work:work-multiprocess
androidx.room:room-runtime
androidx.room:room-common
androidx.room:room-compiler
androidx.room:room-compiler-processing
androidx.room:room-compiler-processing-testing
androidx.room:room-guava
androidx.room:room-gradle-plugin
androidx.room:room-migration
androidx.room:room-paging
androidx.room:room-paging-android
androidx.room:room-ktx
androidx.room:room-paging-guava
androidx.room:room-paging-rxjava2
androidx.room:room-runtime-android
androidx.room:room-paging-rxjava3
androidx.room:room-rxjava2
androidx.room:room-rxjava3
androidx.room:room-testing
androidx.room:room-testing-android
androidx.sqlite:sqlite
androidx.sqlite:sqlite-android
androidx.sqlite:sqlite-framework
androidx.sqlite:sqlite-framework-android
androidx.sqlite:sqlite-ktx
androidx.paging:paging-common
androidx.paging:paging-common-android
androidx.paging:paging-common-ktx
androidx.paging:paging-compose
androidx.paging:paging-compose-android
androidx.paging:paging-guava
androidx.paging:paging-runtime
androidx.paging:paging-runtime-ktx
androidx.paging:paging-rxjava2
androidx.paging:paging-rxjava2-ktx
androidx.paging:paging-rxjava3
androidx.paging:paging-testing
androidx.paging:paging-testing-android
androidx.compose.animation:animation
androidx.compose.animation:animation-android
androidx.compose.animation:animation-core
androidx.compose.animation:animation-core-android
androidx.compose.animation:animation-graphics
androidx.compose.animation:animation-graphics-android
androidx.compose.animation:animation-tooling-internal
androidx.paging:paging-common-jvm
androidx.paging:paging-testing-jvm
androidx.work:work-runtime
androidx.work:work-runtime-ktx
androidx.work:work-rxjava2
androidx.work:work-rxjava3
androidx.work:work-testing

Usage is quite simple and demonstrated in the attached example.
The app collects a list of strokes which are then processed with a call to recognizer.Recognize. The top 10 candidates are returned.

It supports many languages: https://developers.google.com/ml-kit/vision/digital-ink-recognition/base-models#text
The language model is downloaded if needed.
Don't miss the manifest editor snippet.

personalapps · Sunday at 1:27 PM

Is there an easier way to install all those resources? It is difficult to search for those and install individually

Erel · Sunday at 1:43 PM

In the future they will be included in the SDK package.

For now you will need to download them, however don't search one by one. Search for androidx.room, androidx.work, androidx.paging and androidx.compose, and install everything. It will not take you more than 7 minutes.

personalapps · Sunday at 3:42 PM

Works with terrible handwriting (Hindi code 'hi') too!

Mehrzad238 · Sunday at 8:40 PM

Erel said:
androidx.room

Hello, I am getting an error while trying to install resources.

HTML:

<!DOCTYPE html>
<html lang=en>
  <meta charset=utf-8>
  <meta name=viewport content="initial-scale=1, minimum-scale=1, width=device-width">
  <title>Error 404 (Not Found)!!1</title>
  <style>
    *{margin:0;padding:0}html,code{font:15px/22px arial,sans-serif}html{background:#fff;color:#222;padding:15px}body{margin:7% auto 0;max-width:390px;min-height:180px;padding:30px 0 15px}* > body{background:url(//www.google.com/images/errors/robot.png) 100% 5px no-repeat;padding-right:205px}p{margin:11px 0 22px;overflow:hidden}ins{color:#777;text-decoration:none}a img{border:0}@media screen and (max-width:772px){body{background:none;margin-top:0;max-width:none;padding-right:0}}#logo{background:url(//www.google.com/images/logos/errorpage/error_logo-150x54.png) no-repeat;margin-left:-5px}@media only screen and (min-resolution:192dpi){#logo{background:url(//www.google.com/images/logos/errorpage/error_logo-150x54-2x.png) no-repeat 0% 0%/100% 100%;-moz-border-image:url(//www.google.com/images/logos/errorpage/error_logo-150x54-2x.png) 0}}@media only screen and (-webkit-min-device-pixel-ratio:2){#logo{background:url(//www.google.com/images/logos/errorpage/error_logo-150x54-2x.png) no-repeat;-webkit-background-size:100% 100%}}#logo{display:inline-block;height:54px;width:150px}
  </style>
  <a href=//www.google.com/><span id=logo aria-label=Google></span></a>
  <p><b>404.</b> <ins>That’s an error.</ins>
  <p>  <ins>That’s all we know.</ins>

This error comes from at least 10 of them or more
In the end, I got stuck at

B4X:

Maven artifact not found: androidx.sqlite/sqlite
Source: androidx.room:room-runtime

personalapps · Monday at 3:09 AM

Seamless with Tamil too

Erel · Monday at 5:36 AM

Mehrzad238 said:
Maven artifact not found: androidx.sqlite/sqlite

Tools - B4A Sdk Manager - install the missing artifact. There are many resources that you will need to install.

Mehrzad238 · Monday at 9:48 AM

Erel said:
Tools - B4A Sdk Manager - install the missing artifact. There are many resources that you will need to install.

I know what must be done the problem is it does not download the resources( only 7 of them remains, i installed the rest of them ),I attached the screenshot on post #5

Erel · 2025-01-21T05:39:12+0000

It fails to download "test-services". You don't need it. You also don't need the ios*, mac* or linux* resources.
If it doesn't work for you then wait for the updated package.

Mehrzad238 · 2025-01-21T20:22:10+0000

Erel said:
It fails to download "test-services". You don't need it. You also don't need the ios*, mac* or linux* resources.
If it doesn't work for you then wait for the updated package.

Ok, I got it.
I just got excited i want to test myself

B4A Library Digital Ink Recognition based on ML Kit

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