一、生成二维码工具类封装
1、二维码库
// 二维码
implementation 'com.journeyapps:zxing-android-embedded:4.3.0'
2、工具类
/**
* 二维码
* 处理工具
*/
public class QRCodeDealUtils {
/**
* @param content 字符串内容
* @param size 位图宽&高(单位:px)
* @param logo 二维码logo
* @param logoPercent 二维码logo的占比 [0,1]
* @return
*/
public static Bitmap createQRCodeBitmapLogo(String content, int size, Bitmap logo, float logoPercent) {
Bitmap qrCodeBitmap = null;
Bitmap bitmap;
try {
// 不带logo二维码
qrCodeBitmap = generateQRCodeWithoutMargin(content, size, size);
// 带logo 二维码
bitmap = addLogoToQRCode(qrCodeBitmap, logo, logoPercent);
} catch (WriterException e) {
throw new RuntimeException(e);
}
return bitmap;
}
/**
* 生成
* 无白色边框
* 二维码
*/
public static Bitmap generateQRCodeWithoutMargin(String text, int width, int height) throws WriterException {
QRCodeWriter qrCodeWriter = new QRCodeWriter();
Map<EncodeHintType, Object> hints = new HashMap<>();
hints.put(EncodeHintType.MARGIN, 0); // 设置边距为0
BitMatrix bitMatrix = qrCodeWriter.encode(text, BarcodeFormat.QR_CODE, width, height, hints);
int[] pixels = new int[width * height];
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
if (bitMatrix.get(x, y)) {
pixels[y * width + x] = Color.BLACK; // 黑色像素
} else {
pixels[y * width + x] = Color.TRANSPARENT; // 透明像素，去除白边
}
}
}
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
}
/**
* 给二维码
* 添加logo
*/
public static Bitmap addLogoToQRCode(Bitmap srcBitmap, Bitmap logoBitmap, float logoPercent) {
// 计算Logo相对于二维码的尺寸
int logoWidth = Math.round(srcBitmap.getWidth() * logoPercent);
int logoHeight = Math.round(srcBitmap.getHeight() * logoPercent);
// 确保Logo尺寸不会超过二维码尺寸
if (logoWidth > srcBitmap.getWidth() || logoHeight > srcBitmap.getHeight()) {
throw new IllegalArgumentException("Logo size is too large for the QR code.");
}
// 创建一个新的Bitmap来保存带Logo的二维码
Bitmap resultBitmap = Bitmap.createBitmap(srcBitmap.getWidth(), srcBitmap.getHeight(), srcBitmap.getConfig());
Canvas canvas = new Canvas(resultBitmap);
// 绘制原始二维码
canvas.drawBitmap(srcBitmap, 0, 0, null);
// 创建一个Matrix对象来缩放Logo
Matrix matrix = new Matrix();
matrix.postScale(logoWidth / (float) logoBitmap.getWidth(),
logoHeight / (float) logoBitmap.getHeight());
// 计算Logo应该放置的位置（中心）
int xOffset = (srcBitmap.getWidth() - logoWidth) / 2;
int yOffset = (srcBitmap.getHeight() - logoHeight) / 2;
// 在二维码上绘制Logo
canvas.drawBitmap(logoBitmap, xOffset, yOffset, null);
return resultBitmap;
}
}
二、方法说明
1、不带logo
/**
* 生成
* 无白色边框
* 二维码
*/
public static Bitmap generateQRCodeWithoutMargin(String text, int width, int height) throws WriterException {
QRCodeWriter qrCodeWriter = new QRCodeWriter();
Map<EncodeHintType, Object> hints = new HashMap<>();
hints.put(EncodeHintType.MARGIN, 0); // 设置边距为0
BitMatrix bitMatrix = qrCodeWriter.encode(text, BarcodeFormat.QR_CODE, width, height, hints);
int[] pixels = new int[width * height];
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
if (bitMatrix.get(x, y)) {
pixels[y * width + x] = Color.BLACK; // 黑色像素
} else {
pixels[y * width + x] = Color.TRANSPARENT; // 透明像素，去除白边
}
}
}
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
}
2、给二维码添加logo的方法
/**
* 给二维码
* 添加logo
*/
public static Bitmap addLogoToQRCode(Bitmap srcBitmap, Bitmap logoBitmap, float logoPercent) {
// 计算Logo相对于二维码的尺寸
int logoWidth = Math.round(srcBitmap.getWidth() * logoPercent);
int logoHeight = Math.round(srcBitmap.getHeight() * logoPercent);
// 确保Logo尺寸不会超过二维码尺寸
if (logoWidth > srcBitmap.getWidth() || logoHeight > srcBitmap.getHeight()) {
throw new IllegalArgumentException("Logo size is too large for the QR code.");
}
// 创建一个新的Bitmap来保存带Logo的二维码
Bitmap resultBitmap = Bitmap.createBitmap(srcBitmap.getWidth(), srcBitmap.getHeight(), srcBitmap.getConfig());
Canvas canvas = new Canvas(resultBitmap);
// 绘制原始二维码
canvas.drawBitmap(srcBitmap, 0, 0, null);
// 创建一个Matrix对象来缩放Logo
Matrix matrix = new Matrix();
matrix.postScale(logoWidth / (float) logoBitmap.getWidth(),
logoHeight / (float) logoBitmap.getHeight());
// 计算Logo应该放置的位置（中心）
int xOffset = (srcBitmap.getWidth() - logoWidth) / 2;
int yOffset = (srcBitmap.getHeight() - logoHeight) / 2;
// 在二维码上绘制Logo
canvas.drawBitmap(logoBitmap, xOffset, yOffset, null);
return resultBitmap;
}
3、调用方式
/**
* @param content 字符串内容
* @param size 位图宽&高(单位:px)
* @param logo 二维码logo
* @param logoPercent 二维码logo的占比 [0,1]
* @return
*/
public static Bitmap createQRCodeBitmapLogo(String content, int size, Bitmap logo, float logoPercent) {
Bitmap qrCodeBitmap = null;
Bitmap bitmap;
try {
// 不带logo二维码
qrCodeBitmap = generateQRCodeWithoutMargin(content, size, size);
// 带logo 二维码
bitmap = addLogoToQRCode(qrCodeBitmap, logo, logoPercent);
} catch (WriterException e) {
throw new RuntimeException(e);
}
return bitmap;
}
