Android生成二维码图片及在图片上添加文字并保存

近期接到一个需求，将一串文字生成二维码，并在点击图片时将二维码图片保存到相册。话不多说，上代码

/**
 * Created by $ Ping.sir on 2018/8/14.
 * 二维码工具类
 */

public class QRCodeUtil {
    private static final String CHARSET = "UTF-8";
    private static final String FORMAT_NAME = "JPG";
    // 二维码尺寸
    private static final int QRCODE_SIZE = 314;
    // LOGO宽度
    private static final int WIDTH = 60;
    // LOGO高度
    private static final int HEIGHT = 60;

    /**
     * user: Rex
     * date: 2016年12月29日  上午12:31:29
     * @param content 二维码内容
     * @return 返回二维码图片
     * @throws WriterException
     * @throws IOException
     * BufferedImage
     */
    public static Bitmap createImage(String content) {
        Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        hints.put(EncodeHintType.MARGIN, 2);
        BitMatrix bitMatrix = null;
        Bitmap image = null;
        try {
            bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE, hints);
            int width = bitMatrix.getWidth();
            int height = bitMatrix.getHeight();
            int[] pixels = new int[width*height];
            for (int x = 0; x < width; x++) {
                for (int y = 0; y < height; y++) {
                    if (bitMatrix.get(y,x)){
                        pixels[y*width +x] = 0xff000000;
                    }else {
                        pixels[y*width + x] = 0xffffffff;
                    }
//                    image.setPixel(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
                }
            }
            image = Bitmap.createBitmap(pixels,width,height,Bitmap.Config.ARGB_8888);
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 插入图片
//        QRCodeUtil.insertImage(image, logoImgPath, needCompress);
        return image;
    }

    /**
     * 生成图片  加上title的图片
     * @param content
     * @param title
     * @return
     */
    public static Bitmap createImage(String content,String title) {
        int picWidth = 720;//生成图片的宽度
        int picHeight = 765;//生成图片的高度
        int titleTextSize = 30;
        int contentTextSize = 22;
        int textColor = Color.BLACK;
        int qrWidth = 366;
        int qrHeight = 366;
        int paddingTop = 152;
        int paddingMiddle = 40;
        int paddingBottom = 24;

        //最终生成的图片
        Bitmap result = Bitmap.createBitmap(picWidth,picHeight,Bitmap.Config.ARGB_8888);

        Paint paint = new Paint();
        paint.setColor(Color.WHITE);
        Canvas canvas = new Canvas(result);

        //先画一整块白色矩形块
        canvas.drawRect(0,0,picWidth,picHeight,paint);

        //画title文字
        Rect bounds = new Rect();
        paint.setColor(textColor);
        paint.setTextSize(titleTextSize);
        //获取文字的字宽高，以便将文字与图片中心对齐
        paint.getTextBounds(title,0,title.length(),bounds);
        canvas.drawText(title,picWidth/2-bounds.width()/2,paddingTop+bounds.height()/2,paint);

        //画白色矩形块
        int qrTop = paddingTop+titleTextSize+paddingMiddle;//二维码的顶部高度

        //画二维码
        Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        hints.put(EncodeHintType.MARGIN, 5);
        BitMatrix bitMatrix;
        Bitmap image = null;
        try {
            bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, qrWidth, qrHeight, hints);
            int width = bitMatrix.getWidth();
            int height = bitMatrix.getHeight();
            image = Bitmap.createBitmap(width,height,Bitmap.Config.ARGB_8888);
            for (int x = 0; x < width; x++) {
                for (int y = 0; y < height; y++) {
                    image.setPixel(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        paint.setColor(Color.BLACK);
        canvas.drawBitmap(image,(picWidth-qrWidth)/2,qrTop,paint);

        //画文字
        paint.setColor(Color.BLACK);
        paint.setTextSize(contentTextSize);
        int lineTextCount = (int)((picWidth-50)/contentTextSize);
        int line = (int)(Math.ceil(Double.valueOf(content.length())/Double.valueOf(lineTextCount)));
        int textTop = qrTop+qrHeight+paddingBottom;//地址的顶部高度

        for (int i = 0 ; i < line ; i++){
            String s;
            if (i == line-1){
                s = content.substring(i*lineTextCount,content.length());
            }else {
                s = content.substring(i * lineTextCount,(i+1)*lineTextCount);
            }
            paint.getTextBounds(content,0,s.length(),bounds);

            canvas.drawText(s,picWidth/2-bounds.width()/2,textTop+i*contentTextSize+i*5+bounds.height()/2,paint);
        }

        canvas.save(Canvas.ALL_SAVE_FLAG);
        canvas.restore();

        return result;
    }

}

 

保存图片：

public void saveBitmapFromView(ImageView view) {
//        view.buildDrawingCache(true);
//        view.buildDrawingCache();
//        Bitmap bmp = Bitmap.createBitmap(view.getDrawingCache());
//        Bitmap bitmap = drawBitmap(bmp);
//        view.setDrawingCacheEnabled(false);
        Bitmap bmp = QRCodeUtil.createImage(coinCollectionAddress, ViewHelp.getInputString(mTitleTextView));
        DateFormat format = new SimpleDateFormat("yyyyMMddHHmmss", Locale.CHINA);
        saveBitmap(bmp, format.format(new Date()) + ".JPEG");
    }

其中：

coinCollectionAddress为二维码地址

效果图如下：