Android生成二维码工具类封装及使用

  // 二维码
    implementation 'com.journeyapps:zxing-android-embedded:4.3.0'

/**
 * 二维码
 * 处理工具
 */

public class qrcodedealutils {

    /**
     * @param content     字符串内容
     * @param size        位图宽&高(单位:px)
     * @param logo        二维码logo
     * @param logopercent 二维码logo的占比 [0,1]
     * @return
     */
    public static bitmap createqrcodebitmaplogo(string content, int size, bitmap logo, float logopercent) {
        bitmap qrcodebitmap = null;
        bitmap bitmap;
        try {
            // 不带logo二维码
            qrcodebitmap = generateqrcodewithoutmargin(content, size, size);
            // 带logo 二维码
            bitmap = addlogotoqrcode(qrcodebitmap, logo, logopercent);
        } catch (writerexception e) {
            throw new runtimeexception(e);
        }

        return bitmap;
    }


    /**
     * 生成
     * 无白色边框
     * 二维码
     */
    public static bitmap generateqrcodewithoutmargin(string text, int width, int height) throws writerexception {
        qrcodewriter qrcodewriter = new qrcodewriter();
        map<encodehinttype, object> hints = new hashmap<>();
        hints.put(encodehinttype.margin, 0); // 设置边距为0

        bitmatrix bitmatrix = qrcodewriter.encode(text, barcodeformat.qr_code, width, height, hints);
        int[] pixels = new int[width * height];

        for (int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++) {
                if (bitmatrix.get(x, y)) {
                    pixels[y * width + x] = color.black; // 黑色像素
                } else {
                    pixels[y * width + x] = color.transparent; // 透明像素，去除白边
                }
            }
        }

        bitmap bitmap = bitmap.createbitmap(width, height, bitmap.config.argb_8888);
        bitmap.setpixels(pixels, 0, width, 0, 0, width, height);

        return bitmap;
    }

    /**
     * 给二维码
     * 添加logo
     */
    public static bitmap addlogotoqrcode(bitmap srcbitmap, bitmap logobitmap, float logopercent) {
        // 计算logo相对于二维码的尺寸
        int logowidth = math.round(srcbitmap.getwidth() * logopercent);
        int logoheight = math.round(srcbitmap.getheight() * logopercent);

        // 确保logo尺寸不会超过二维码尺寸
        if (logowidth > srcbitmap.getwidth() || logoheight > srcbitmap.getheight()) {
            throw new illegalargumentexception("logo size is too large for the qr code.");
        }

        // 创建一个新的bitmap来保存带logo的二维码
        bitmap resultbitmap = bitmap.createbitmap(srcbitmap.getwidth(), srcbitmap.getheight(), srcbitmap.getconfig());
        canvas canvas = new canvas(resultbitmap);

        // 绘制原始二维码
        canvas.drawbitmap(srcbitmap, 0, 0, null);

        // 创建一个matrix对象来缩放logo
        matrix matrix = new matrix();
        matrix.postscale(logowidth / (float) logobitmap.getwidth(),
                logoheight / (float) logobitmap.getheight());

        // 计算logo应该放置的位置（中心）
        int xoffset = (srcbitmap.getwidth() - logowidth) / 2;
        int yoffset = (srcbitmap.getheight() - logoheight) / 2;

        // 在二维码上绘制logo
        canvas.drawbitmap(logobitmap, xoffset, yoffset, null);

        return resultbitmap;
    }


}

   /**
     * 生成
     * 无白色边框
     * 二维码
     */
    public static bitmap generateqrcodewithoutmargin(string text, int width, int height) throws writerexception {
        qrcodewriter qrcodewriter = new qrcodewriter();
        map<encodehinttype, object> hints = new hashmap<>();
        hints.put(encodehinttype.margin, 0); // 设置边距为0

        bitmatrix bitmatrix = qrcodewriter.encode(text, barcodeformat.qr_code, width, height, hints);
        int[] pixels = new int[width * height];

        for (int y = 0; y < height; y++) {
            for (int x = 0; x < width; x++) {
                if (bitmatrix.get(x, y)) {
                    pixels[y * width + x] = color.black; // 黑色像素
                } else {
                    pixels[y * width + x] = color.transparent; // 透明像素，去除白边
                }
            }
        }

        bitmap bitmap = bitmap.createbitmap(width, height, bitmap.config.argb_8888);
        bitmap.setpixels(pixels, 0, width, 0, 0, width, height);

        return bitmap;
    }

   /**
     * 给二维码
     * 添加logo
     */
    public static bitmap addlogotoqrcode(bitmap srcbitmap, bitmap logobitmap, float logopercent) {
        // 计算logo相对于二维码的尺寸
        int logowidth = math.round(srcbitmap.getwidth() * logopercent);
        int logoheight = math.round(srcbitmap.getheight() * logopercent);

        // 确保logo尺寸不会超过二维码尺寸
        if (logowidth > srcbitmap.getwidth() || logoheight > srcbitmap.getheight()) {
            throw new illegalargumentexception("logo size is too large for the qr code.");
        }

        // 创建一个新的bitmap来保存带logo的二维码
        bitmap resultbitmap = bitmap.createbitmap(srcbitmap.getwidth(), srcbitmap.getheight(), srcbitmap.getconfig());
        canvas canvas = new canvas(resultbitmap);

        // 绘制原始二维码
        canvas.drawbitmap(srcbitmap, 0, 0, null);

        // 创建一个matrix对象来缩放logo
        matrix matrix = new matrix();
        matrix.postscale(logowidth / (float) logobitmap.getwidth(),
                logoheight / (float) logobitmap.getheight());

        // 计算logo应该放置的位置（中心）
        int xoffset = (srcbitmap.getwidth() - logowidth) / 2;
        int yoffset = (srcbitmap.getheight() - logoheight) / 2;

        // 在二维码上绘制logo
        canvas.drawbitmap(logobitmap, xoffset, yoffset, null);

        return resultbitmap;
    }

/**
     * @param content     字符串内容
     * @param size        位图宽&高(单位:px)
     * @param logo        二维码logo
     * @param logopercent 二维码logo的占比 [0,1]
     * @return
     */
    public static bitmap createqrcodebitmaplogo(string content, int size, bitmap logo, float logopercent) {
        bitmap qrcodebitmap = null;
        bitmap bitmap;
        try {
            // 不带logo二维码
            qrcodebitmap = generateqrcodewithoutmargin(content, size, size);
            // 带logo 二维码
            bitmap = addlogotoqrcode(qrcodebitmap, logo, logopercent);
        } catch (writerexception e) {
            throw new runtimeexception(e);
        }

        return bitmap;
    }