如何使用新的Google Vision API生成条形码并将其转换为位图？
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;
//实施转化
位图barcodeImage = barcodeToBitmap(条形码); //我知道这一部分.
解决方法
您可以使用Google Vision API检测条形码,然后使用ZXing生成条形码.
你可以尝试这样的东西,它使用zxing库：
你可以尝试这样的东西,它使用zxing库：
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,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;
}
}
