package com.yaojian.qrcode;
import java.util.Hashtable;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.PaintFlagsDrawFilter;
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;
/**
* @ClassName: QRCodeUtils
* @Description: zxing生成二维码工具，可带logo，可调颜色。
* @author yaojian
*/
public class QRCodeUtils {
/**
* 根据指定内容生成自定义宽高的二维码图片
*
* param content 需要生成二维码的内容
* param width 二维码宽度
* param height 二维码高度
*/
public static Bitmap makeQRImage(String content, int QR_WIDTH, int QR_HEIGHT) {
return makeQRImage(content, QR_WIDTH, QR_HEIGHT, null);
}
/**
* 根据指定内容生成自定义宽高的二维码图片
*
* param logoBm logo图标
* param content 需要生成二维码的内容
* param width 二维码宽度
* param height 二维码高度
*/
public static Bitmap makeQRImage(String content, int QR_WIDTH,
int QR_HEIGHT, Bitmap logoBmp) {
try {
// 图像数据转换，使用了矩阵转换
Hashtablehints = new Hashtable();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);// 容错级别
// 设置空白边距的宽度
hints.put(EncodeHintType.MARGIN, 2); // default is 4
hints.put(EncodeHintType.MAX_SIZE, 350);
hints.put(EncodeHintType.MIN_SIZE, 100);
BitMatrix bitMatrix = new QRCodeWriter().encode(content,
BarcodeFormat.QR_CODE, QR_WIDTH, QR_HEIGHT, hints);
int[] pixels = new int[QR_WIDTH * QR_HEIGHT];
// 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
// 设置二维码颜色渐变
int[] rgb = setGradientColor("#03a9f4");
for (int y = 0; y < QR_HEIGHT; y++) {
for (int x = 0; x < QR_WIDTH; x++) {
if (bitMatrix.get(x, y)) {
// 二维码颜色设置
if (x > 0 && x < 110 && y > 0 && y < 110) {
Color color = new Color();
int colorInt = color.parseColor("#e79138");
pixels[y * QR_WIDTH + x] = bitMatrix.get(x, y) ? colorInt
: 16777215;
} else {
// 设置二维码颜色渐变
int r = (int) (rgb[0] - (rgb[0] - 13.0)
/ bitMatrix.getHeight() * (y + 1));
int g = (int) (rgb[1] - (rgb[1] - 72.0)
/ bitMatrix.getHeight() * (y + 1));
int b = (int) (rgb[2] - (rgb[2] - 107.0)
/ bitMatrix.getHeight() * (y + 1));
Color color = new Color();
int colorInt = color.argb(255, r, g, b);
pixels[y * QR_WIDTH + x] = bitMatrix.get(x, y) ? colorInt
: 16777215;
}
} else {
pixels[y * QR_WIDTH + x] = 0xffffffff;// 白色
}
}
}
// ------------------添加logo部分------------------//
Bitmap bitmap = Bitmap.createBitmap(QR_WIDTH, QR_HEIGHT,
Bitmap.Config.ARGB_8888);
// 设置像素点
bitmap.setPixels(pixels, 0, QR_WIDTH, 0, 0, QR_WIDTH, QR_HEIGHT);
if (logoBmp == null) {
return bitmap;
}
// 获取图片宽高
int logoWidth = logoBmp.getWidth();
int logoHeight = logoBmp.getHeight();
if (QR_WIDTH == 0 || QR_HEIGHT == 0) {
return null;
}
if (logoWidth == 0 || logoHeight == 0) {
return bitmap;
}
// 图片绘制在二维码中央，合成二维码图片
// logo大小为二维码整体大小的1/4
float scaleFactor = QR_WIDTH * 1.0f / 4 / logoWidth;
try {
Canvas canvas = new Canvas(bitmap);
canvas.setDrawFilter(new PaintFlagsDrawFilter(0,
Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG));
canvas.drawBitmap(bitmap, 0, 0, null);
canvas.scale(scaleFactor, scaleFactor, QR_WIDTH / 2,
QR_HEIGHT / 2);
canvas.drawBitmap(logoBmp, (QR_WIDTH - logoWidth) / 2,
(QR_HEIGHT - logoHeight) / 2, null);
canvas.save(Canvas.ALL_SAVE_FLAG);
canvas.restore();
return bitmap;
} catch (Exception e) {
bitmap = null;
e.getStackTrace();
}
} catch (WriterException e) {
e.printStackTrace();
}
return null;
}
private static int[] setGradientColor(String colorStr) {
int[] rgbs = new int[3];
rgbs[0] = Integer.parseInt(colorStr.substring(1, 3), 16);
rgbs[1] = Integer.parseInt(colorStr.substring(3, 5), 16);
rgbs[2] = Integer.parseInt(colorStr.substring(5, 7), 16);
return rgbs;
}
}