public Bitmap encodeAsBitmap() throws WriterException {
if (!encoded) return null;
Map<EncodeHintType, Object> hints = null;
String encoding = guessAppropriateEncoding(contents);
if (encoding != null) {
hints = new EnumMap<EncodeHintType, Object>(EncodeHintType.class);
hints.put(EncodeHintType.CHARACTER_SET, encoding);
}
MultiFormatWriter writer = new MultiFormatWriter();
BitMatrix result = writer.encode(contents, format, dimension, dimension, hints);
int width = result.getWidth();
int height = result.getHeight();
int[] pixels = new int[width * height];
// All are 0, or black, by default
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) ? BLACK : WHITE;
}
}
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
}
/**
* Encode a string into a QR Code and return a bitmap image of the QR code
*
* @param contentsToEncode String to be encoded, this will often be a URL, but could be any string
* @param imageWidth number of pixels in width for the resultant image
* @param imageHeight number of pixels in height for the resultant image
* @param marginSize the EncodeHintType.MARGIN parameter into zxing engine
* @param color data color for QR code
* @param colorBack background color for QR code
* @return bitmap containing QR code image
* @throws com.google.zxing.WriterException zxing engine is unable to create QR code data
* @throws IllegalStateException when executed on the UI thread
*/
public static Bitmap generateBitmap(
@NonNull String contentsToEncode,
int imageWidth,
int imageHeight,
int marginSize,
int color,
int colorBack)
throws WriterException, IllegalStateException {
if (Looper.myLooper() == Looper.getMainLooper()) {
// throw new IllegalStateException("Should not be invoked from the UI thread");
}
Map<EncodeHintType, Object> hints = null;
if (marginSize != MARGIN_AUTOMATIC) {
hints = new EnumMap<>(EncodeHintType.class);
// We want to generate with a custom margin size
hints.put(EncodeHintType.MARGIN, marginSize);
}
MultiFormatWriter writer = new MultiFormatWriter();
BitMatrix result =
writer.encode(contentsToEncode, BarcodeFormat.QR_CODE, imageWidth, imageHeight, hints);
final int width = result.getWidth();
final 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) ? color : colorBack;
}
}
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
}
public Bitmap generateQR(String text) {
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int width = size.x * 3 / 4;
int height = width;
MultiFormatWriter writer = new MultiFormatWriter();
Hashtable hints = new Hashtable();
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.Q);
BitMatrix matrix = null;
Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
try {
matrix = writer.encode(text, BarcodeFormat.QR_CODE, width, height, hints);
} catch (WriterException e) {
return bmp;
}
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;
}