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Tracking mentions began in Dec 2020.
QR in Java?
1 project | reddit.com/r/java | 31 Jan 2021
Java is so popular because virtually every niche problem probably has a library or seven. I ran https://www.google.cz/search?q=java%20qr and got an article with examples, https://www.baeldung.com/java-generating-barcodes-qr-codes#2d-barcodes, using these two libraries: https://github.com/zxing/zxing and https://github.com/kenglxn/QRGen
What are some alternatives?
BGAQRCode-Android - QRCode 扫描二维码、扫描条形码、相册获取图片后识别、生成带 Logo 二维码、支持微博微信 QQ 二维码扫描样式
Code Scanner - Code scanner library for Android, based on ZXing
KBarcode - A library to help implement barcode scanning
EasyMoney-Widgets - The widgets (EditText and TextView) for support of money requirements like currency, number formatting, comma formatting etc.
AnimatedTextCarousel - A simple cool text carousel for Android