字符串 转换成 二维码

/**将字符串  转换成  二维码   调用 generateQRCode(string)
 * Created by tangzheng on 2016/8/4.
 */
public class StringToQRCode {
    private Bitmap bitMatrix2Bitmap(BitMatrix matrix) {
        int w = matrix.getWidth();
        int h = matrix.getHeight();
        int[] rawData = new int[w * h];
        for (int i = 0; i < w; i++) {
            for (int j = 0; j < h; j++) {
                int color = Color.WHITE;
                if (matrix.get(i, j)) {
                    color = Color.BLACK;
                }
                rawData[i + (j * w)] = color;
            }
        }

        Bitmap bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.RGB_565);
        bitmap.setPixels(rawData, 0, w, 0, 0, w, h);
        return bitmap;
    }

    public   Bitmap generateQRCode(String content) {
        try {
            QRCodeWriter writer = new QRCodeWriter();
            BitMatrix matrix = writer.encode(content, BarcodeFormat.QR_CODE, 500, 500);
            return bitMatrix2Bitmap(matrix);
        } catch (WriterException e) {
            e.printStackTrace();
        }
        return null;
    }
}