轉載請註明http://blog.csdn.net/houkai6/article/details/47102733

1. 生成二維碼

public final class EncodingHandler {
	private static final int BLACK = 0xff000000;
	
	public static Bitmap createQRCode(String str,int widthAndHeight) throws WriterException {
		Hashtable<EncodeHintType, String> hints = new Hashtable<EncodeHintType, String>();  
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); 
		BitMatrix matrix = new MultiFormatWriter().encode(str,
				BarcodeFormat.QR_CODE, widthAndHeight, widthAndHeight);
		int width = matrix.getWidth();
		int height = matrix.getHeight();
		int[] pixels = new int[width * height];
		
		for (int y = 0; y < height; y++) {
			for (int x = 0; x < width; x++) {
				if (matrix.get(x, y)) {
					pixels[y * width + x] = BLACK;
				}
			}
		}
		Bitmap bitmap = Bitmap.createBitmap(width, height,
				Bitmap.Config.ARGB_8888);
		bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
		return bitmap;
	}
}

2. 解析圖片中的二維碼

public final class DecodeHandler {
    public static String decode(Bitmap bitmap) {
        if (bitmap == null) {
            return null;
        }
        
        int[] intArray = new int[bitmap.getWidth() * bitmap.getHeight()];
        bitmap.getPixels(intArray, 0, bitmap.getWidth(), 0, 0, bitmap.getWidth(), bitmap.getHeight());
        LuminanceSource source = new RGBLuminanceSource(bitmap.getWidth(), bitmap.getHeight(), intArray);

        BinaryBitmap binaryBitmap = new BinaryBitmap(new HybridBinarizer(source));
        Reader reader = new MultiFormatReader();
        try {
            Result result = reader.decode(binaryBitmap);
            return result.getText();
        } catch (NotFoundException e) {
            e.printStackTrace();
        } catch (ChecksumException e) {
            e.printStackTrace();
        } catch (FormatException e) {
            e.printStackTrace();
        }
        return null;
    }
}