【源码】二维码透明底和去除白边功能
布局（activity.xml）、权限（AndroidManifest.xml）和 MainActivity.java（基本一致） 跟先前的源码一致这里就不重复了，需要可以参考先前的。
飞机票：【源码】二维码生成及美化
MakeQRCodeUtil.java
package com.showimage.start.showimage;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import java.util.HashMap;
/**
* Created on 2016/2/24.
* 生成二维码的工具类
*/
public class MakeQRCodeUtil {
/**
* 转换位图
*
* @param matrix 原图
* @param alpha 透明度 0 透明 1半透明 2不透明
* @return
*/
private static Bitmap bitMatrix2Bitmap(BitMatrix matrix, int alpha) {
int WIDTH = matrix.getWidth();
int HEIGHT = matrix.getHeight();
int[] pixels = new int[WIDTH * HEIGHT];
for (int y = 0; y < WIDTH; y++) {
for (int x = 0; x < HEIGHT; x++) {
int color;
switch (alpha){
case 0:
color = 0x00FFFFFF;
break;
case 1:
color = 0x80FFFFFF;
break;
default:
color = 0xFFFFFFFF;
break;
}
if (matrix.get(x, y)) {
// 有内容的部分，颜色设置为黑色，当然这里可以自己修改成喜欢的颜色
color = 0xFF000000;
}
pixels[x + (y * WIDTH)] = color;
}
}
Bitmap bitmap = Bitmap.createBitmap(WIDTH, HEIGHT, Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, WIDTH, 0, 0, WIDTH, HEIGHT);
return bitmap;
}
/**
* 设置透明度
*
* @param alpha 透明度
* @return Paint 画笔
*/
private static Paint setAlpha(int alpha) {
// 建立Paint 物件
Paint vPaint = new Paint();
vPaint .setStyle( Paint.Style.STROKE ); //空心
vPaint .setAlpha(alpha); //0—255
return vPaint;
}
/**
* 设置透明度
*
* @param alpha 透明度 1 不透明 0 半透明
* @return Paint 画笔
*/
private static Paint selectAlpha(int alpha) {
if(alpha == 0){
return setAlpha(75);
}else{
return setAlpha(255);
}
}
/**
* 添加logo
*
* @param src 原图
* @param logo logo图
* @return 效果图
*/
private static Bitmap addLogo(Bitmap src, Bitmap logo) {
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 (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.ALL_SAVE_FLAG);
canvas.restore();
} catch (Exception e) {
bitmap = null;
e.getStackTrace();
}
return bitmap;
}
/**
* 从资源文件中获取图片
*
* @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);
//获取透明度
Paint vPaint = selectAlpha(0);
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() * 3 / 5,
srcBMP.getHeight() * 3 / 7, vPaint);
// 保存
cv.save(Canvas.ALL_SAVE_FLAG);
// 存储
cv.restore();
return newb;
}
/**
* 给二维码图片加背景
*
* @param foreground 原图
* @param background 背景图
* @return 效果图
*/
public static Bitmap addBackground(Bitmap foreground, Bitmap background) {
int bgWidth = background.getWidth();
int bgHeight = background.getHeight();
int fgWidth = foreground.getWidth();
int fgHeight = foreground.getHeight();
Bitmap newmap = Bitmap
.createBitmap(bgWidth, bgHeight, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(newmap);
canvas.drawBitmap(background, 0, 0, null);
canvas.drawBitmap(foreground, (bgWidth - fgWidth) / 2,
(bgHeight - fgHeight) * 2 / 5 + 70, null);
canvas.save(Canvas.ALL_SAVE_FLAG);
canvas.restore();
return newmap;
}
/**
* 生成带logo的二维码
*
* @param logo logo图
* @param content 内容
* @param width 宽度
* @param height 高度
* @param alpha 透明度
* @param isEdge 去白边 true 去除 false 保留
* @return 二维码
*/
public static Bitmap generateQRCode(Bitmap logo, String content, int width, int height, int alpha, boolean isEdge) {
return addLogo(generateQRCode(content, width, height,alpha,isEdge), logo);
}
/**
* 生成不带logo的二维码
*
* @param content 内容
* @param width 宽度
* @param height 高度
* @param alpha 透明度
* @param isEdge 去白边 true 去除 false 保留
* @return 二维码
*/
public static Bitmap generateQRCode(String content, int width, int height, int alpha, boolean isEdge) {
try {
HashMap hints = new HashMap();
// 设置编码方式utf-8
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
//设置二维码的纠错级别为h
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
BitMatrix matrix;
if(isEdge){
matrix = new QRCodeWriter().encode(content,BarcodeFormat.QR_CODE, width, height, hints);
}else{
matrix = new MultiFormatWriter().encode(content,BarcodeFormat.QR_CODE, width, height, hints);
}
return bitMatrix2Bitmap(matrix, alpha);
} catch (WriterException e) {
e.printStackTrace();
}
return null;
}
/**
* 添加文字
*
* @param bmpSrc 二维码图
* @param text 文字
* @return 效果图
*/
public static Bitmap addTextToBitmap(Bitmap bmpSrc, String text) {
int srcWidth = bmpSrc.getWidth();
int srcHeight = bmpSrc.getHeight();
// 先计算text所需要的height
int textSize = 20;
int padding = 3;
int textLinePadding = 1;
// 每行的文字
int perLineWords = (srcWidth - 2 * padding) / textSize;
int lineNum = text.length() / perLineWords;
lineNum = text.length() % perLineWords == 0 ? lineNum : lineNum + 1;
int textTotalHeight = lineNum * (textSize + textLinePadding) + 2 * padding;
Bitmap bitmap = Bitmap.createBitmap(srcWidth, srcHeight + textTotalHeight,
Bitmap.Config.ARGB_8888);
try {
Canvas canvas = new Canvas(bitmap);
canvas.drawColor(Color.WHITE);
canvas.drawBitmap(bmpSrc, 0, 0, null);
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(Color.BLACK);
paint.setTextSize(textSize);
String lineText;
for (int i = 0, startY = srcHeight + textSize, start, end; i < lineNum; i++) {
start = i * perLineWords;
end = start + perLineWords;
lineText = text.substring(start, end > text.length() ? text.length() : end);
canvas.drawText(lineText, padding, startY, paint);
startY += textSize + textLinePadding;
}
canvas.save(Canvas.ALL_SAVE_FLAG);
canvas.restore();
} catch (Exception e) {
bitmap = null;
e.getStackTrace();
}
return bitmap;
}
} QRCodeWriter.java
package com.showimage.start.showimage;
/**
* Created by twk on 2019/6/25.
*/
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.Writer;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import com.google.zxing.qrcode.encoder.ByteMatrix;
import com.google.zxing.qrcode.encoder.Encoder;
import com.google.zxing.qrcode.encoder.QRCode;
import java.util.Map;
public final class QRCodeWriter implements Writer {
private static final int QUIET_ZONE_SIZE = 4;
public QRCodeWriter() {
}
public BitMatrix encode(String contents, BarcodeFormat format, int width, int height) throws WriterException {
return this.encode(contents, format, width, height, (Map)null);
}
public BitMatrix encode(String contents, BarcodeFormat format, int width, int height, Map hints) throws WriterException {
if(contents.length() == 0) {
throw new IllegalArgumentException("Found empty contents");
} else if(format != BarcodeFormat.QR_CODE) {
throw new IllegalArgumentException("Can only encode QR_CODE, but got " + format);
} else if(width >= 0 && height >= 0) {
ErrorCorrectionLevel errorCorrectionLevel = ErrorCorrectionLevel.L;
if(hints != null) {
ErrorCorrectionLevel code = (ErrorCorrectionLevel)hints.get(EncodeHintType.ERROR_CORRECTION);
if(code != null) {
errorCorrectionLevel = code;
}
}
QRCode code1 = new QRCode();
Encoder.encode(contents, errorCorrectionLevel, hints, code1);
return renderResult(code1, width, height);
} else {
throw new IllegalArgumentException("Requested dimensions are too small: " + width + 'x' + height);
}
}
private static BitMatrix renderResult(QRCode code, int width, int height) {
ByteMatrix input = code.getMatrix();
if (input == null) {
throw new IllegalStateException();
}
int inputWidth = input.getWidth();
int inputHeight = input.getHeight();
// 依据用户的输入宽高，计算最后的输出宽高
int outputWidth = Math.max(width, inputWidth);
int outputHeight = Math.max(height, inputHeight);
//计算缩放比例
int multiple = Math.min(outputWidth / inputWidth, outputHeight / inputHeight);
//重新写一次outputWidth和inputHeight
outputWidth = multiple * inputWidth;
outputHeight = multiple * inputHeight;
// Log.d(TAG, "renderResult: outputWidth " +outputWidth +" outputHeight "+outputHeight);
// Log.d(TAG, "renderResult: inputHeight " +inputWidth +" inputHeight "+inputHeight);
// Log.d(TAG, "renderResult: multiple " + multiple);
BitMatrix output = new BitMatrix(outputWidth, outputHeight);
int inputY = 0;
// 嵌套循环，将ByteMatrix的内容计算padding后转换成BitMatrix
for (int outputY = 0; inputY < inputHeight; outputY += multiple) {
int inputX = 0;
for (int outputX = 0; inputX < inputWidth; outputX += multiple) {
if (input.get(inputX, inputY) == 1) {
output.setRegion(outputX, outputY, multiple, multiple);
}
inputX++;
}
inputY++;
}
return output;
}
}
以上就是全部源码，如果有调试问题，欢迎留言告知，如果对你有帮助，请给我个赞，谢谢！！