BarcodeUtil.kt

import android.graphics.Bitmap
import android.graphics.Color
import com.google.zxing.BarcodeFormat
import com.google.zxing.EncodeHintType
import com.google.zxing.MultiFormatWriter
import com.google.zxing.WriterException
import com.google.zxing.common.BitMatrix

object BarcodeUtil {
    @Throws(WriterException::class)
    fun barcodeFromString(barcodeFormat: BarcodeFormat, str: String, width: Int, height: Int): Bitmap? {
        val result: BitMatrix
        val stride: Int
        try {
            val hints = mapOf(EncodeHintType.MARGIN to 0)
            if (barcodeFormat == BarcodeFormat.QR_CODE) {
                val square = Math.min(width, height)
                stride = square
                result = MultiFormatWriter().encode(str, barcodeFormat, square, square, hints)
            } else {
                stride = width
                result = MultiFormatWriter().encode(str, barcodeFormat, width, height, hints)
            }
        } catch (iae: IllegalArgumentException) {
            // Unsupported format
            return null
        }

        val w = result.width
        val h = result.height
        val pixels = IntArray(w * h)


        for (y in 0..h - 1) {
            val offset = y * w
            for (x in 0..w - 1) {
                pixels[offset + x] = if (result.get(x, y)) {
                    Color.BLACK
                } else {
                    Color.WHITE
                }

            }
        }
        val bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888)
        bitmap.setPixels(pixels, 0, stride, 0, 0, w, h)
        return bitmap
    }
}