How to generate an Barcode and convert it to Bitmap using new Google Vision API?

Question

How to generate an Barcode and convert it to Bitmap using new Google Vision API?

Barcode barcode = new Barcode();
Barcode.Email email = new Barcode.Email();
email.address = "my_email@gmail.com";
email.subject = "My Subject;
email.body = "My body content.";
barcode.email = email;

//Implement conversion Bitmap barcodeImage = barcodeToBitmap(barcode);// I do know this part.

Answer 1

You can detect your barcodes using Google Vision API and then use ZXing to generate the barcodes. You could try something like this, it uses zxing library:

public static Bitmap getBitmap(String barcode, int barcodeType, int width, int height)
{
    Bitmap barcodeBitmap = null;
    BarcodeFormat barcodeFormat = convertToZXingFormat(barcodeType);
    try
    {
        barcodeBitmap = encodeAsBitmap(barcode, barcodeFormat, width, height);
    }
    catch (WriterException e)
    {
        e.printStackTrace();
    }
    return barcodeBitmap;
}

private static BarcodeFormat convertToZXingFormat(int format)
{
    switch (format)
    {
        case 8:
            return BarcodeFormat.CODABAR;
        case 1:
            return BarcodeFormat.CODE_128;
        case 2:
            return BarcodeFormat.CODE_39;
        case 4:
            return BarcodeFormat.CODE_93;
        case 32:
            return BarcodeFormat.EAN_13;
        case 64:
            return BarcodeFormat.EAN_8;
        case 128:
            return BarcodeFormat.ITF;
        case 512:
            return BarcodeFormat.UPC_A;
        case 1024:
            return BarcodeFormat.UPC_E;
        //default 128?
        default:
            return BarcodeFormat.CODE_128;
    }
}


/**************************************************************
 * getting from com.google.zxing.client.android.encode.QRCodeEncoder
 *
 * See the sites below
 * http://code.google.com/p/zxing/
 * http://code.google.com/p/zxing/source/browse/trunk/android/src/com/google/zxing/client/android/encode/EncodeActivity.java
 * http://code.google.com/p/zxing/source/browse/trunk/android/src/com/google/zxing/client/android/encode/QRCodeEncoder.java
 */

private static final int WHITE = 0xFFFFFFFF;
private static final int BLACK = 0xFF000000;

private static Bitmap encodeAsBitmap(String contents, BarcodeFormat format, int img_width, int img_height) throws WriterException
{
    if (contents == null) {
        return null;
    }
    Map<EncodeHintType, Object> hints = null;
    String encoding = guessAppropriateEncoding(contents);
    if (encoding != null) {
        hints = new EnumMap<>(EncodeHintType.class);
        hints.put(EncodeHintType.CHARACTER_SET, encoding);
    }
    MultiFormatWriter writer = new MultiFormatWriter();
    BitMatrix result;
    try {
        result = writer.encode(contents, 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;
}

}