How to generate QR code with logo inside it?

Question

I am developing the application for Android devices. I want to generate QR code with logo inside it.

With ZXing I know how to generate simple QR codes li

Answer 1

You can add your logo it as an Image Overlay like

public BufferedImage getQRCodeWithOverlay(BufferedImage qrcode) 
{
    BufferedImage scaledOverlay = scaleOverlay(qrcode);

    Integer deltaHeight = qrcode.getHeight() - scaledOverlay.getHeight();
    Integer deltaWidth  = qrcode.getWidth()  - scaledOverlay.getWidth();

    BufferedImage combined = new BufferedImage(qrcode.getWidth(), qrcode.getHeight(), BufferedImage.TYPE_INT_ARGB);
    Graphics2D g2 = (Graphics2D)combined.getGraphics();
    g2.drawImage(qrcode, 0, 0, null);
    g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, overlayTransparency));
    g2.drawImage(scaledOverlay, Math.round(deltaWidth/2), Math.round(deltaHeight/2), null);
    return combined;
}

private BufferedImage scaleOverlay(BufferedImage qrcode)
{
    Integer scaledWidth = Math.round(qrcode.getWidth() * overlayToQRCodeRatio);
    Integer scaledHeight = Math.round(qrcode.getHeight() * overlayToQRCodeRatio);

    BufferedImage imageBuff = new BufferedImage(scaledWidth, scaledHeight, BufferedImage.TYPE_INT_ARGB);
    Graphics g = imageBuff.createGraphics();
    g.drawImage(overlay.getScaledInstance(scaledWidth, scaledHeight, BufferedImage.SCALE_SMOOTH), 0, 0, new Color(0,0,0), null);
    g.dispose();
    return imageBuff;
}

Please refer this post & github for more info

Answer 2

I created the following Kotlin Extention, which adds a Bitmap to the centre of another Bitmap:

fun Bitmap.addOverlayToCenter(overlayBitmap: Bitmap): Bitmap {

    val bitmap2Width = overlayBitmap.width
    val bitmap2Height = overlayBitmap.height
    val marginLeft = (this.width * 0.5 - bitmap2Width * 0.5).toFloat()
    val marginTop = (this.height * 0.5 - bitmap2Height * 0.5).toFloat()
    val canvas = Canvas(this)
    canvas.drawBitmap(this, Matrix(), null)
    canvas.drawBitmap(overlayBitmap, marginLeft, marginTop, null)
    return this
}

Can find my full solution here.