Android Generate Text to QR Code

I had develop and app for scan qr code but it seen like we need and qr generator right? It will work either compose or not. That’s not a problem.

If you want to know more here my site

So here we are .

Firstly you need implement another dependency call Zxing

implementation("com.google.zxing:core:3.4.1")

and just a simple function it show do the magic.

What we need is image as bitmap so

fun qrCodeGenerator(data: String, size: Int) = try {
    val writer = QRCodeWriter()
    val bitMatrix: BitMatrix = writer.encode(data, BarcodeFormat.QR_CODE, size, size)
    val width: Int = bitMatrix.width
    val height: Int = bitMatrix.height
    val pixels = IntArray(width * height)
    for (y in 0 until height) {
        val offset = y * width
        for (x in 0 until width) {
            pixels[offset + x] =
                if (bitMatrix.get(x, y)) 0xFF000000.toInt() else 0xFFFFFFFF.toInt()
        }
    }
    Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888).apply {
        setPixels(pixels, 0, width, 0, 0, width, height)
    }
} catch (e: Exception) {
    null
}

For Jetpack Compose

Surface(
    modifier = Modifier.fillMaxSize(),
    color = MaterialTheme.colorScheme.background
) {
    val qr = qrCodeGenerator("http://128.199.87.161/", 200)
    if (qr != null)
        Image(
            bitmap = qr.asImageBitmap(),
            contentDescription = "my site",
            contentScale = ContentScale.Fit,
        )
}

Congrats for Compose user!

For None Compose.

qrCodeGenerator("http://128.199.87.161/", size = 500)?.let { bitmap ->
    binding.imageView.setImageBitmap(bitmap)
}

Congrats for you guys.

Thank you for your time

I hope this is what you looking for.