detect pictures whether qr-code or not

Question

I'v been using zxing core recently, but I'v no idea how to detect a bitmap or other picture types whether a QR code or not. Any help can fix this? Using zxing is better while other libraries is OK.Thanks.

Answer 1

First You have to learn what is a QR code it is a two-dimensional barcode.you convert normal text to QR code and read a QR code to convert to string.

in zxing you can make a qr code from this code

public static Bitmap encodeToQrCode(String text, int width, int height){
    QRCodeWriter writer = new QRCodeWriter();
    BitMatrix matrix = null;
    try {
        matrix = writer.encode(text, BarcodeFormat.QR_CODE, 100, 100);
    } catch (WriterException ex) {
        ex.printStackTrace();
    }
    Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
    for (int x = 0; x < width; x++){
        for (int y = 0; y < height; y++){
            bmp.setPixel(x, y, matrix.get(x,y) ? Color.BLACK : Color.WHITE);
        }
    }
    return bmp;
}

the above code produce a bitmap image you can display it to an imageview.and remember this qr code readers decode QR codes to string.it dosn't work if the QR code not properly encoded