Android code to scan Qr code in android studio using kotlin

Android code to scan Qr code from image in android studio using kotlin

To scan a QR code in Android Studio using Kotlin, you can use the BarcodeDetector class from the Google Mobile Vision library.

First, add the following dependency to your app's build.gradle file:

implementation 'com.google.android.gms:play-services-vision:20.1.0'

Next, create a BarcodeDetector object and use it to scan a QR code from an image or camera preview:

val barcodeDetector = BarcodeDetector.Builder(context)
    .setBarcodeFormats(Barcode.QR_CODE)
    .build()

val image = // Image containing the QR code
val frame = Frame.Builder().setBitmap(image).build()
val barcodes = barcodeDetector.detect(frame)

if (barcodes.size() > 0) {
    val barcode = barcodes.valueAt(0)
    val qrCode = barcode.rawValue
    // Use the QR code value
} else {
    // QR code not found
}

In this example, the BarcodeDetector is configured to detect QR codes, and the detect method is used to scan the QR code from an image stored in the image variable. If a QR code is found, the value is stored in the QR Code variable.

You can also use the BarcodeDetector to scan QR codes from a camera preview by using the CameraSource and SurfaceView classes. You can find more information and examples in the documentation for the Google Mobile Vision library.