I'm using in my app ZXing library for generating QR code. I want to generated QR code that should fits to the width of the screen (maybe some small padding).
If I set width of the screen as width size of QR code I get smaller QR code. Look at the screenshot (it's 320x240 resolution). I want QR code to fit the black area. Why is QR code in red so small?
How do I stretch it to the black area?
My code:
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x;
Bitmap bm = encodeAsBitmap(mGeneratedURL, BarcodeFormat.QR_CODE, width, width);
qrcodeImage.setImageBitmap(bm);
Generating QR code:
private Bitmap encodeAsBitmap(String contents, BarcodeFormat format, int img_width, int img_height) throws WriterException {
String contentsToEncode = contents;
if (contentsToEncode == null) {
return null;
}
Map<EncodeHintType, Object> hints = null;
String encoding = guessAppropriateEncoding(contentsToEncode);
if (encoding != null) {
hints = new EnumMap<EncodeHintType, Object>(EncodeHintType.class);
//hints.put(EncodeHintType.CHARACTER_SET, encoding);
hints.put(EncodeHintType.MARGIN, 0); /* default = 4 */
}
MultiFormatWriter writer = new MultiFormatWriter();
BitMatrix result;
try {
result = writer.encode(contentsToEncode, format, img_width, img_height, hints);
} catch (IllegalArgumentException iae) {
// Unsupported format
return null;
}
int width = result.getWidth();
int height = result.getHeight();
int[] pixels = new int[width * height];
for (int y = 0; y < height; y++) {
int offset = y * width;
for (int x = 0; x < width; x++) {
pixels[offset + x] = result.get(x, y) ? RED : Color.BLACK;
}
}
Bitmap bitmap = Bitmap.createBitmap(width, height,
Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
}
