[Android] 바코드 생성하기

목적 : ZXing 라이브러리 사용하여 바코드 생성하기

1. 라이브러리 추가

compile 'com.google.zxing:core:3.3.2'

2. 핵심 코드 

// 배경 색상
private static final int WHITE = 0xFFFFFFFF;
// 바코드 색상
private static final int BLACK = 0xFF000000;

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);
    }
    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) ? BLACK : WHITE;
        }
    }

    Bitmap bitmap = Bitmap.createBitmap(width, height,
            Bitmap.Config.ARGB_8888);
    bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
    return bitmap;
}

private static String guessAppropriateEncoding(CharSequence contents) {
    // Very crude at the moment
    for (int i = 0; i < contents.length(); i++) {
        if (contents.charAt(i) > 0xFF) {
            return "UTF-8";
        }
    }
    return null;
}

3. 사용법

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    ImageView barcode = findViewById(R.id.imageView);

    String barcode_data = "1234567890";

    // barcode image
    try {
        Bitmap bitmap = encodeAsBitmap(barcode_data , BarcodeFormat.CODE_128 , 600 , 300);
        barcode.setImageBitmap(bitmap);
    } catch (WriterException e) {
        e.printStackTrace();
    }

}

도움이 되시면 좋겠습니다.