注入开源库
implementation 'com.google.zxing:core:3.3.0'
二维码生成标准
utils
类
public class QRCodeUtil {
private static int IMAGE_HALFWIDTH = 50;//宽度值,影响中间图片大小
/**
* 生成二维码,默认大小为500*500
*
* @param text 需要生成二维码的文字、网址等
* @return bitmap
*/
public static Bitmap createQRCode(String text) {
return createQRCode(text, 150);
}
/**
* 生成二维码
*
* @param text 需要生成二维码的文字、网址等
* @param size 需要生成二维码的大小()
* @return bitmap
*/
public static Bitmap createQRCode(String text, int size) {
try {
Hashtable hints = new Hashtable<>();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
hints.put(EncodeHintType.MARGIN, 1);
BitMatrix bitMatrix = new QRCodeWriter().encode(text,
BarcodeFormat.QR_CODE, size, size, hints);
int[] pixels = new int[size * size];
for (int y = 0; y < size; y++) {
for (int x = 0; x < size; x++) {
if (bitMatrix.get(x, y)) {
pixels[y * size + x] = 0xff000000;
} else {
pixels[y * size + x] = 0xffffffff;
}
}
}
Bitmap bitmap = Bitmap.createBitmap(size, size,
Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, size, 0, 0, size, size);
return bitmap;
} catch (WriterException e) {
e.printStackTrace();
return null;
}
}
/**
* 生成带logo的二维码,默认二维码的大小为500,logo为二维码的1/5
*
* @param text 需要生成二维码的文字、网址等
* @param mBitmap logo文件
* @return bitmap
*/
public static Bitmap createQRCodeWithLogo(String text, Bitmap mBitmap) {
return createQRCodeWithLogo(text, 500, mBitmap);
}
/**
* 生成带logo的二维码,logo默认为二维码的1/5
*
* @param text 需要生成二维码的文字、网址等
* @param size 需要生成二维码的大小()
* @param mBitmap logo文件
* @return bitmap
*/
public static Bitmap createQRCodeWithLogo(String text, int size, Bitmap mBitmap) {
try {
IMAGE_HALFWIDTH = size / 10;
Hashtable hints = new Hashtable<>();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
/*
* 设置容错级别,默认为ErrorCorrectionLevel.L
* 因为中间加入logo所以建议你把容错级别调至H,否则可能会出现识别不了
*/
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
//设置空白边距的宽度
hints.put(EncodeHintType.MARGIN, 1); //default is 4
// 图像数据转换,使用了矩阵转换
BitMatrix bitMatrix = new QRCodeWriter().encode(text,
BarcodeFormat.QR_CODE, size, size, hints);
int width = bitMatrix.getWidth();//矩阵高度
int height = bitMatrix.getHeight();//矩阵宽度
int halfW = width / 2;
int halfH = height / 2;
Matrix m = new Matrix();
float sx = (float) 2 * IMAGE_HALFWIDTH / mBitmap.getWidth();
float sy = (float) 2 * IMAGE_HALFWIDTH
/ mBitmap.getHeight();
m.setScale(sx, sy);
//设置缩放信息
//将logo图片按martix设置的信息缩放
mBitmap = Bitmap.createBitmap(mBitmap, 0, 0,
mBitmap.getWidth(), mBitmap.getHeight(), m, false);
int[] pixels = new int[size * size];
for (int y = 0; y < size; y++) {
for (int x = 0; x < size; x++) {
if (x > halfW - IMAGE_HALFWIDTH && x < halfW + IMAGE_HALFWIDTH
&& y > halfH - IMAGE_HALFWIDTH
&& y < halfH + IMAGE_HALFWIDTH) {
//该位置用于存放图片信息
//记录图片每个像素信息
pixels[y * width + x] = mBitmap.getPixel(x - halfW
+ IMAGE_HALFWIDTH, y - halfH + IMAGE_HALFWIDTH);
} else {
if (bitMatrix.get(x, y)) {
pixels[y * size + x] = 0xff000000;
} else {
pixels[y * size + x] = 0xffffffff;
}
}
}
}
Bitmap bitmap = Bitmap.createBitmap(size, size,
Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, size, 0, 0, size, size);
return bitmap;
} catch (WriterException e) {
e.printStackTrace();
return null;
}
}
/**
* 生成二维码Bitmap 此方法与上面的createQRCodeWithLogo方法效果一样(设置Bitmap两种写方法)
*
* @param context
* @param data 文本内容
* @param logoBm 二维码中心的Logo图标(可以为null)
* @return 合成后的bitmap
*/
public static Bitmap createQRImage(Context context, String data, Bitmap logoBm) {
try {
if (data == null || "".equals(data)) {
return null;
}
int widthPix = ((Activity) context).getWindowManager().getDefaultDisplay()
.getWidth();
widthPix = widthPix / 5 * 3;
int heightPix = widthPix;
//配置参数
Map 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, 1); //default is 4
// 图像数据转换,使用了矩阵转换
BitMatrix bitMatrix = new QRCodeWriter().encode(data, 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);
}
return bitmap;
//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 (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 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.restore();
} catch (Exception e) {
bitmap = null;
e.getStackTrace();
}
return bitmap;
}
}