QRCodeUtil.java

QRCodeUtil.java

package xmaihh.pay.zxing;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.PointF;
import android.view.Gravity;
import android.view.View;
import android.widget.TextView;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import android.widget.LinearLayout.LayoutParams;
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&条形码生成工具类
 * <href=implementation 'com.google.zxing:core:3.3.0'/>
 */
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 {
            // 判断合法性
            if (content == null || "".equals(content) || content.length() < 1) {
                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
     */
    protected 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.restore();
        } catch (Exception e) {
            bitmap = null;
            e.getStackTrace();
        }

        return bitmap;
    }


    /**
     * 生成条形码
     *
     * @param context
     * @param contents      需要生成的内容
     * @param desiredWidth  生成条形码的宽带
     * @param desiredHeight 生成条形码的高度
     * @param displayCode   是否在条形码下方显示内容
     * @return
     */
    public static Bitmap creatBarcode(Context context, String contents,
                                      int desiredWidth, int desiredHeight, boolean displayCode) {
        Bitmap ruseltBitmap = null;
        /**
         * 图片两端所保留的空白的宽度
         */
        int marginW = 20;
        /**
         * 条形码的编码类型
         */
        BarcodeFormat barcodeFormat = BarcodeFormat.CODE_128;

        if (displayCode) {
            Bitmap barcodeBitmap = encodeAsBitmap(contents, barcodeFormat,
                    desiredWidth, desiredHeight);
            Bitmap codeBitmap = creatCodeBitmap(contents, desiredWidth + 2
                    * marginW, desiredHeight, context);
            ruseltBitmap = mixtureBitmap(barcodeBitmap, codeBitmap, new PointF(
                    0, desiredHeight));
        } else {
            ruseltBitmap = encodeAsBitmap(contents, barcodeFormat,
                    desiredWidth, desiredHeight);
        }

        return ruseltBitmap;
    }

    /**
     * 生成条形码的Bitmap
     *
     * @param contents      需要生成的内容
     * @param format        编码格式
     * @param desiredWidth
     * @param desiredHeight
     * @return
     * @throws WriterException
     */
    protected static Bitmap encodeAsBitmap(String contents,
                                           BarcodeFormat format, int desiredWidth, int desiredHeight) {
        final int WHITE = 0xFFFFFFFF;
        final int BLACK = 0xFF000000;

        MultiFormatWriter writer = new MultiFormatWriter();
        BitMatrix result = null;
        try {
            result = writer.encode(contents, format, desiredWidth,
                    desiredHeight, null);
        } catch (WriterException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        int width = result.getWidth();
        int height = result.getHeight();
        int[] pixels = new int[width * height];
        // All are 0, or black, by default
        for (int y = 0; y < height; y++) {
            int offset = y * width;
            for (int x = 0; x < width; x++) {
                pixels[offset + x] = result.get(x, y) ? BLACK : WHITE;
            }
        }

        Bitmap bitmap = Bitmap.createBitmap(width, height,
                Bitmap.Config.ARGB_8888);
        bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
        return bitmap;
    }

    /**
     * 生成显示编码的Bitmap
     *
     * @param contents
     * @param width
     * @param height
     * @param context
     * @return
     */
    protected static Bitmap creatCodeBitmap(String contents, int width,
                                            int height, Context context) {
        TextView tv = new TextView(context);
        LayoutParams layoutParams = new LayoutParams(
                LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
        tv.setLayoutParams(layoutParams);
        tv.setText(contents);
        tv.setHeight(height);
        tv.setGravity(Gravity.CENTER_HORIZONTAL);
        tv.setWidth(width);
        tv.setDrawingCacheEnabled(true);
        tv.setTextColor(Color.BLACK);
        tv.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
                View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
        tv.layout(0, 0, tv.getMeasuredWidth(), tv.getMeasuredHeight());

        tv.buildDrawingCache();
        Bitmap bitmapCode = tv.getDrawingCache();
        return bitmapCode;
    }

    /**
     * 将两个Bitmap合并成一个
     *
     * @param first
     * @param second
     * @param fromPoint 第二个Bitmap开始绘制的起始位置（相对于第一个Bitmap）
     * @return
     */
    protected static Bitmap mixtureBitmap(Bitmap first, Bitmap second,
                                          PointF fromPoint) {
        if (first == null || second == null || fromPoint == null) {
            return null;
        }
        int marginW = 20;
        Bitmap newBitmap = Bitmap.createBitmap(
                first.getWidth() + second.getWidth() + marginW,
                first.getHeight() + second.getHeight(), Bitmap.Config.ARGB_4444);
        Canvas cv = new Canvas(newBitmap);
        cv.drawBitmap(first, marginW, 0, null);
        cv.drawBitmap(second, fromPoint.x, fromPoint.y, null);
        cv.save();
        cv.restore();

        return newBitmap;
    }

}