Android 生成带有Logo的二维码

来源:互联网 发布:无主之地2画质优化 编辑:程序博客网 时间:2024/05/17 23:50

一、前言

公司项目改进优化,需要在二维码的正中间加入产品Logo,

二、实现代码

如下:

封装到工具类中,方便调用:

import android.graphics.Bitmap;import android.graphics.Canvas;import com.google.zxing.BarcodeFormat;import com.google.zxing.EncodeHintType;import com.google.zxing.WriterException;import com.google.zxing.common.BitMatrix;import com.google.zxing.qrcode.QRCodeWriter;import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;import java.io.FileOutputStream;import java.io.IOException;import java.util.HashMap;import java.util.Map;/** * 二维码生成工具类 */public class QRCodeUtil {    /**     * 生成二维码Bitmap     *     * @param content   内容     * @param widthPix  图片宽度     * @param heightPix 图片高度     * @param logoBm    二维码中心的Logo图标(可以为null)     * @param filePath  用于存储二维码图片的文件路径     * @return 生成二维码及保存文件是否成功     */    public static boolean createQRImage(String content, int widthPix, int heightPix, Bitmap logoBm, String filePath) {        try {            if (content == null || "".equals(content)) {                return false;            }            //配置参数              Map<EncodeHintType, Object> hints = new HashMap<>();            hints.put(EncodeHintType.CHARACTER_SET, "utf-8");            //容错级别              hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);            //设置空白边距的宽度              //            hints.put(EncodeHintType.MARGIN, 2); //default is 4              // 图像数据转换,使用了矩阵转换              BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, widthPix, heightPix, hints);            int[] pixels = new int[widthPix * heightPix];            // 下面这里按照二维码的算法,逐个生成二维码的图片,              // 两个for循环是图片横列扫描的结果              for (int y = 0; y < heightPix; y++) {                for (int x = 0; x < widthPix; x++) {                    if (bitMatrix.get(x, y)) {                        pixels[y * widthPix + x] = 0xff000000;                    } else {                        pixels[y * widthPix + x] = 0xffffffff;                    }                }            }            // 生成二维码图片的格式,使用ARGB_8888              Bitmap bitmap = Bitmap.createBitmap(widthPix, heightPix, Bitmap.Config.ARGB_8888);            bitmap.setPixels(pixels, 0, widthPix, 0, 0, widthPix, heightPix);            if (logoBm != null) {                bitmap = addLogo(bitmap, logoBm);            }            //必须使用compress方法将bitmap保存到文件中再进行读取。直接返回的bitmap是没有任何压缩的,内存消耗巨大!              return bitmap != null && bitmap.compress(Bitmap.CompressFormat.JPEG, 100, new FileOutputStream(filePath));        } catch (WriterException | IOException e) {            e.printStackTrace();        }        return false;    }    /**     * 在二维码中间添加Logo图案     */    private static Bitmap addLogo(Bitmap src, Bitmap logo) {        if (src == null) {            return null;        }        if (logo == null) {            return src;        }        //获取图片的宽高          int srcWidth = src.getWidth();        int srcHeight = src.getHeight();        int logoWidth = logo.getWidth();        int logoHeight = logo.getHeight();        if (srcWidth == 0 || srcHeight == 0) {            return null;        }        if (logoWidth == 0 || logoHeight == 0) {            return src;        }        //logo大小为二维码整体大小的1/5          float scaleFactor = srcWidth * 1.0f / 5 / logoWidth;        Bitmap bitmap = Bitmap.createBitmap(srcWidth, srcHeight, Bitmap.Config.ARGB_8888);        try {            Canvas canvas = new Canvas(bitmap);            canvas.drawBitmap(src, 0, 0, null);            canvas.scale(scaleFactor, scaleFactor, srcWidth / 2, srcHeight / 2);            canvas.drawBitmap(logo, (srcWidth - logoWidth) / 2, (srcHeight - logoHeight) / 2, null);            canvas.save(Canvas.ALL_SAVE_FLAG);            canvas.restore();        } catch (Exception e) {            bitmap = null;            e.getStackTrace();        }        return bitmap;    }}

在Activity中调用

                final String filePath = getFileRoot(MainActivity.this) + File.separator                        + "qr_" + System.currentTimeMillis() + ".jpg";                //二维码图片较大时,生成图片、保存文件的时间可能较长,因此放在新线程中                  new Thread(new Runnable() {                    @Override                    public void run() {                        boolean success = QRCodeUtil.createQRImage(strUrl, 800,800,<span style="font-family: 'microsoft yahei';">BitmapFactory.decodeResource(getResources(), R.mipmap.qr_logo) </span><span style="font-family: 'microsoft yahei';">,</span><span style="font-family: 'microsoft yahei';">filePath);</span>                        if (success) {                            runOnUiThread(new Runnable() {                                @Override                                public void run() {                                    imageView.setImageBitmap(BitmapFactory.decodeFile(filePath));                                }                            });                        }                    }                }).start();


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