Wie generiert man einen Barcode und wandelt ihn mithilfe der neuen Google Vision API in Bitmap um?

Question

Wie generiert man einen Barcode und konvertiert ihn mit der neuen Google Vision API in Bitmap?

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; 

// Implementieren Umwandlung Bitmap barcodeimage = barcodeToBitmap (Barcode); // ich diesen Teil nicht kennen.

Answer 1

Sie können Ihre Barcodes mit der Google Vision-API erkennen und dann ZXing verwenden, um die Barcodes zu generieren. Sie so etwas wie dies versuchen könnte, verwendet es ZXing Bibliothek:

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; 
} 

}