Simple Barcode Scanner is developed from Android Vision API sample: https://github.com/googlesamples/android-vision.
This app has simple modification to make it easier for daily usage.

Simple Barcode Scanner can detects barcodes in real-time, on device, in any orientation. It can also detect multiple barcodes at once.
This app can reads the following barcode formats:
- 1D barcodes: EAN-13, EAN-8, UPC-A, UPC-E, Code-39, Code-93, Code-128, ITF, Codabar
- 2D barcodes: QR Code, Data Matrix, PDF-417, AZTEC

Simple Barcode Scanner can also parses QR Codes, Data Matrix, PDF-417, and Aztec values, for the following supported formats:
- URL
- Contact information (VCARD, etc.)
- Calendar event
- Email
- Phone
- SMS
- ISBN
- WiFi
- Geo-location (latitude and longitude)
- AAMVA driver license/ID
But this app can only show the raw value for formats above.

To capture the barcode, you need to touch on barcode rectangle overlay.
For more information related to Android Mobile Vision, you can follo this link: https://developers.google.com/vision/android/barcodes-overview

Thanks for installing this apps.