Zxing生成自定义二维码样式
现在几乎每个app都带有二维码，但是google提供的zxing包，只给我们提供了核心的二维码算法，而开发过程中经常有自定义二维码的样式的需求，这时候我们就要自己写工具类封装。
先看效果图：
正常样式黑白的二维码图片
带背景的二维码图片
带logo的
彩色的
上源码：主要就一个QRUilt.class
/**
* 二维码工具类
*/
public class QRUtils {
private static final int transparency = 0x00000000;
private static final int BLACK = 0xFF000000;
/**
* 根据指定内容生成自定义宽高的二维码图片
* <p>
* 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
* throws WriterException
* 生成二维码异常
*/
public static Bitmap makeColorQRImage(String content, int QR_WIDTH) throws WriterException {
int QR_HEIGHT = QR_WIDTH;
try {
// 图像数据转换，使用了矩阵转换
Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);// 容错率
hints.put(EncodeHintType.MARGIN,0);//设置二维码白边的大小
BitMatrix bitMatrix = new QRCodeWriter().encode(content,
BarcodeFormat.QR_CODE, QR_WIDTH, QR_HEIGHT, hints);
int[] pixels = new int[QR_WIDTH * QR_HEIGHT];
for (int y = 0; y < QR_HEIGHT; y++) {
// 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 x = 0; x < QR_WIDTH; x++) {
if (bitMatrix.get(x, y)) {
if (x < QR_WIDTH / 2 && y < QR_HEIGHT / 2) {
pixels[y * QR_WIDTH + x] = 0xFF0094FF;// 蓝色
Integer.toHexString(new Random().nextInt());
} else if (x < QR_WIDTH / 2 && y > QR_HEIGHT / 2) {
pixels[y * QR_WIDTH + x] = 0xFFFF0000;// 红色
} else if (x > QR_WIDTH / 2 && y > QR_HEIGHT / 2) {
pixels[y * QR_WIDTH + x] = 0xFF5ACF00;// 绿色
} else {
pixels[y * QR_WIDTH + x] = 0xFF000000;// 黑色
}
} else {
pixels[y * QR_WIDTH + x] = 0x00ffffff;// 白色
}
}
}
// ------------------添加图片部分------------------//
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);
try {
Canvas canvas = new Canvas(bitmap);
canvas.drawBitmap(bitmap, 0, 0, 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;
}
/**
* 获取十六进制的颜色代码.例如 "#6E36B4" , For HTML ,
*
* @return String
*/
public static String getRandColorCode() {
String r, g, b;
Random random = new Random();
r = Integer.toHexString(random.nextInt(256)).toUpperCase();
g = Integer.toHexString(random.nextInt(256)).toUpperCase();
b = Integer.toHexString(random.nextInt(256)).toUpperCase();
r = r.length() == 1 ? "0" + r : r;
g = g.length() == 1 ? "0" + g : g;
b = b.length() == 1 ? "0" + b : b;
return r + g + b;
}
/**
* 从资源文件中获取图片转化成bitmap类型
*
* @param context 上下文
* @param drawableId 资源文件id
* @return
*/
public static Bitmap gainBitmap(Context context, int drawableId) {
Bitmap bmp = BitmapFactory.decodeResource(context.getResources(),
drawableId);
return bmp;
}
/**
* 在图片右下角添加水印
*
* @param srcBMP 原图
* @param markBMP 水印88图片
* @return 合成水印后的图片
*/
public static Bitmap composeWatermark(Bitmap srcBMP, Bitmap markBMP) {
if (srcBMP == null) {
return null;
}
// 创建一个新的和SRC长度宽度一样的位图
Bitmap newb = Bitmap.createBitmap(srcBMP.getWidth(),
srcBMP.getHeight(), Bitmap.Config.ARGB_8888);
Canvas cv = new Canvas(newb);
// 在 0，0坐标开始画入原图
cv.drawBitmap(srcBMP, 0, 0, null);
// 在原图的右下角画入水印
cv.drawBitmap(markBMP, srcBMP.getWidth() - markBMP.getWidth() * 4 / 5,
srcBMP.getHeight() * 2 / 7, null);
// 保存
cv.save(Canvas.ALL_SAVE_FLAG);
// 存储
cv.restore();
return newb;
}
/**
* 给二维码图片加背景
*/
public static Bitmap addBackground(Bitmap foreground, Bitmap background) {
int fgWidth = foreground.getWidth();
int fgHeight = foreground.getHeight();
Bitmap newmap = Bitmap
.createBitmap(fgWidth, fgHeight, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(newmap);
canvas.drawBitmap(resizeImage(background,fgWidth,fgHeight), 0, 0, null);
canvas.drawBitmap(foreground, 0, 0, null);
canvas.save(Canvas.ALL_SAVE_FLAG);
canvas.restore();
return newmap;
}
//使用Bitmap加Matrix来缩放
public static Bitmap resizeImage(Bitmap bitmap, int w, int h)
{
int width = bitmap.getWidth();
int height = bitmap.getHeight();
int newWidth = w;
int newHeight = h;
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
// if you want to rotate the Bitmap
// matrix.postRotate(45);
Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0, width,
height, matrix, true);
return resizedBitmap;
}
//TODO 生成二维码
public static Bitmap encodeToQRWidth(String contentsToEncode, int dimension) throws Exception {
if (TextUtils.isEmpty(contentsToEncode)) return null;
BarcodeFormat format = BarcodeFormat.QR_CODE;
Map hints = new EnumMap(EncodeHintType.class);
hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);// 容错率
hints.put(EncodeHintType.MARGIN,0);//设置二维码白边的大小
BitMatrix result = new MultiFormatWriter().encode(contentsToEncode, format, dimension, dimension, hints);
int width = result.getWidth();
int height = result.getHeight();
boolean isFirstBlack = true;
int startX = 0;
int startY = 0;
int[] pixels = new int[width * height];
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 : transparency;
if (result.get(x, y) && isFirstBlack) {
isFirstBlack = false;
startX = x;
startY = y;
}
}
}
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
Matrix m = new Matrix();
float sx = (width + 2f * startX) / width;
float sy = (height + 2f * startY) / height;
m.postScale(sx, sy);
Bitmap qrBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(qrBitmap);
canvas.translate(-startX, -startY);
Paint paint = new Paint();
paint.setAntiAlias(true);
canvas.drawBitmap(bitmap, m, paint);
canvas.save();
return qrBitmap;
}
//生成带logo的二维码
public static Bitmap encodeToQRWithLogo(String contentsToEncode, int dimension, Bitmap logo) throws Exception {
return addLogo(encodeToQRWidth(contentsToEncode, dimension), logo);
}
//add logo on pic
private static Bitmap addLogo(Bitmap src, Bitmap logo) {
if (src == null) {
return null;
}
if (logo == null) {
return src;
}
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;
}
//set logo width 1/5 of pic width.
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;
}
}
```代码里面一些比较关键的技术点，都有比较详细的注释。y如果y
有什么问题的话，可以留言。我有看到都会解答的。
附录：demo下载地址：(http://download.csdn.net/download/as4399/9772388)