package safeluck.drive.evaluation.util;
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import android.graphics.Bitmap;
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import android.graphics.Canvas;
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import android.text.TextUtils;
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import androidx.annotation.Nullable;
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import com.google.zxing.BarcodeFormat;
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import com.google.zxing.EncodeHintType;
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import com.google.zxing.WriterException;
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import com.google.zxing.common.BitMatrix;
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import com.google.zxing.qrcode.QRCodeWriter;
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import java.util.Hashtable;
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/**
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* @ProjectName: DriveJudge
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* @Package: safeluck.drive.evaluation.util
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* @ClassName: QRCodeUtil
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* @Description: 二维码生成工具
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* @Author: 李占伟
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* @CreateDate: 2020-04-10 15:58
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* @UpdateUser: 更新者
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* @UpdateDate: 2020-04-10 15:58
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* @UpdateRemark: 更新说明
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* @Version: 1.0
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*/
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public class QRCodeUtil {
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/**
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* 生成自定义二维码
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*
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* @param content 字符串内容
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* @param width 二维码宽度
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* @param height 二维码高度
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* @param character_set 编码方式(一般使用UTF-8)
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* @param error_correction_level 容错率 L:7% M:15% Q:25% H:35%
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* @param margin 空白边距(二维码与边框的空白区域)
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* @param color_black 黑色色块
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* @param color_white 白色色块
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* @param logoBitmap logo图片(传null时不添加logo)
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* @param logoPercent logo所占百分比
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* @param bitmap_black 用来代替黑色色块的图片(传null时不代替)
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* @return
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*/
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public static Bitmap createQRCodeBitmap(String content, int width, int height, String character_set, String error_correction_level,
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String margin, int color_black, int color_white, Bitmap logoBitmap, float logoPercent, Bitmap bitmap_black) {
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// 字符串内容判空
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if (TextUtils.isEmpty(content)) {
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return null;
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}
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// 宽和高>=0
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if (width < 0 || height < 0) {
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return null;
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}
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try {
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/** 1.设置二维码相关配置,生成BitMatrix(位矩阵)对象 */
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Hashtable<EncodeHintType, String> hints = new Hashtable<>();
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// 字符转码格式设置
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if (!TextUtils.isEmpty(character_set)) {
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hints.put(EncodeHintType.CHARACTER_SET, character_set);
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}
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// 容错率设置
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if (!TextUtils.isEmpty(error_correction_level)) {
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hints.put(EncodeHintType.ERROR_CORRECTION, error_correction_level);
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}
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// 空白边距设置
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if (!TextUtils.isEmpty(margin)) {
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hints.put(EncodeHintType.MARGIN, margin);
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}
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/** 2.将配置参数传入到QRCodeWriter的encode方法生成BitMatrix(位矩阵)对象 */
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BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, width, height, hints);
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/** 3.创建像素数组,并根据BitMatrix(位矩阵)对象为数组元素赋颜色值 */
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if (bitmap_black != null) {
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//从当前位图按一定的比例创建一个新的位图
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bitmap_black = Bitmap.createScaledBitmap(bitmap_black, width, height, false);
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}
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int[] pixels = new int[width * height];
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for (int y = 0; y < height; y++) {
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for (int x = 0; x < width; x++) {
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//bitMatrix.get(x,y)方法返回true是黑色色块,false是白色色块
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if (bitMatrix.get(x, y)) {// 黑色色块像素设置
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if (bitmap_black != null) {//图片不为null,则将黑色色块换为新位图的像素。
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pixels[y * width + x] = bitmap_black.getPixel(x, y);
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} else {
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pixels[y * width + x] = color_black;
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}
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} else {
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pixels[y * width + x] = color_white;// 白色色块像素设置
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}
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}
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}
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/** 4.创建Bitmap对象,根据像素数组设置Bitmap每个像素点的颜色值,并返回Bitmap对象 */
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Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
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bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
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/** 5.为二维码添加logo图标 */
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if (logoBitmap != null) {
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return addLogo(bitmap, logoBitmap, logoPercent);
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}
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return bitmap;
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} catch (WriterException e) {
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e.printStackTrace();
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return null;
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}
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}
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/**
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* 向二维码中间添加logo图片(图片合成)
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*
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* @param srcBitmap 原图片(生成的简单二维码图片)
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* @param logoBitmap logo图片
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* @param logoPercent 百分比 (用于调整logo图片在原图片中的显示大小, 取值范围[0,1] )
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* 原图片是二维码时,建议使用0.2F,百分比过大可能导致二维码扫描失败。
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* @return
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*/
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@Nullable
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private static Bitmap addLogo(@Nullable Bitmap srcBitmap, @Nullable Bitmap logoBitmap, float logoPercent) {
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if (srcBitmap == null) {
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return null;
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}
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if (logoBitmap == null) {
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return srcBitmap;
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}
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//传值不合法时使用0.2F
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if (logoPercent < 0F || logoPercent > 1F) {
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logoPercent = 0.2F;
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}
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/** 1. 获取原图片和Logo图片各自的宽、高值 */
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int srcWidth = srcBitmap.getWidth();
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int srcHeight = srcBitmap.getHeight();
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int logoWidth = logoBitmap.getWidth();
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int logoHeight = logoBitmap.getHeight();
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/** 2. 计算画布缩放的宽高比 */
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float scaleWidth = srcWidth * logoPercent / logoWidth;
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float scaleHeight = srcHeight * logoPercent / logoHeight;
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/** 3. 使用Canvas绘制,合成图片 */
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Bitmap bitmap = Bitmap.createBitmap(srcWidth, srcHeight, Bitmap.Config.ARGB_8888);
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Canvas canvas = new Canvas(bitmap);
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canvas.drawBitmap(srcBitmap, 0, 0, null);
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canvas.scale(scaleWidth, scaleHeight, srcWidth / 2, srcHeight / 2);
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canvas.drawBitmap(logoBitmap, srcWidth / 2 - logoWidth / 2, srcHeight / 2 - logoHeight / 2, null);
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return bitmap;
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}
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}
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