Zxing 绘制简单二维码
1.什么是二维码?
二维码又称二维条码,常见的二维码为QR Code,QR全称Quick Response,是一个近几年来移动设备上超流行的一种编码方式,它比传统的Bar Code条形码能存更多的信息,也能表示更多的数据类型。
2.引入依赖坐标
// https://mvnrepository.com/artifact/com.google.zxing/core
implementation group: 'com.google.zxing', name: 'core', version: '3.4.1'
3.简单二维码实现
使用QRCode绘制简单二维码
1.参数说明:
ImageView mainCode;
public static final int CODE_WIDTH = 500;
public static final int CODE_HEIGHT = 500;
2.简单实现
QRCodeWriter qrCodeWriter = new QRCodeWriter();
//定义属性
Map<EncodeHintType,String> hintTypeStringMap = new HashMap<>();
hintTypeStringMap.put(EncodeHintType.MARGIN,"0");
hintTypeStringMap.put(EncodeHintType.CHARACTER_SET,"utf8");
try {
BitMatrix bitMatrix = qrCodeWriter.encode("绘制二维码demo", BarcodeFormat.QR_CODE, CODE_WIDTH, CODE_HEIGHT, hintTypeStringMap);
int[] arr = new int[CODE_WIDTH * CODE_HEIGHT];
for (int i = 0; i < CODE_WIDTH; i++) {
for (int j = 0; j < CODE_HEIGHT; j++) {
if(bitMatrix.get(i,j)){
arr[ i * CODE_WIDTH + j] = Color.BLACK;
}else{
arr[ i * CODE_WIDTH + j] = Color.WHITE;
}
}
}
Bitmap bitmap = Bitmap.createBitmap(arr, CODE_WIDTH, CODE_HEIGHT, Bitmap.Config.ARGB_8888);
//设置给ImageView
Glide.with(MainActivity.this).load(bitmap).into(mainCode);
3.效果图(可以扫一扫试一试喔)
4.带logo的二维码实现
1.准备一张白色背景图片以及一张人物头像
2.前提参数说明:
ImageView logoImg;
//二维码宽度
public static final int QR_CODE_WIDTH = 500;
//logo的尺寸不能高于二维码的20%.大于可能会导致二维码失效
public static final int LOGO_WIDTH_MAX = QR_CODE_WIDTH / 5;
//logo的尺寸不能小于二维码的10%,否则不搭
public static final int LOGO_WIDTH_MIN = QR_CODE_WIDTH / 10;
//定义黑色
private static final int BLACK = 0xFF000000;
//定义白色
private static final int WHITE = 0xFFFFFFFF;
3.合成图片
/*
创建Logo白底图片
*/
public Bitmap createBitmap(Bitmap bgBitmap , Bitmap logoBitmap){
int bgWidth = bgBitmap.getWidth();
int bgHeight = bgBitmap.getHeight();
/*
ThumbnailUtils 压缩logo为背景的 1/2
*/
logoBitmap = ThumbnailUtils.extractThumbnail(logoBitmap, bgWidth / 2,
bgHeight / 2, ThumbnailUtils.OPTIONS_RECYCLE_INPUT);
Bitmap canvasBitmap = Bitmap.createBitmap(bgWidth , bgHeight , Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(canvasBitmap);
canvas.drawBitmap(bgBitmap,0,0,null);
/*
图片合成
@param bitmap
@param left
@param top
@paint null
*/
canvas.drawBitmap(logoBitmap,30,30,null );
canvas.save(); //保存
canvas.restore();
if(canvasBitmap.isRecycled()){
canvasBitmap.recycle();
}
return canvasBitmap;
}
4.绘制带logo的图片
补充:最外层的ImageView和要绘制的Logo位置关系
定义logo规则,调整尺寸
public Bitmap createQRBitmap(Bitmap logoBitmap , String content) throws WriterException {
int logoWidth = logoBitmap.getWidth();
int logoHeight = logoBitmap.getHeight();
//规整化图片
int logoHaleWidth = logoWidth >= QR_CODE_WIDTH ? LOGO_WIDTH_MIN : LOGO_WIDTH_MAX;
int logoHaleHeight = logoHeight >= QR_CODE_WIDTH ? LOGO_WIDTH_MIN : LOGO_WIDTH_MAX;
// 将logo图片按martix设置的信息缩放
Matrix matrix = new Matrix();
float sx = (float) logoHaleWidth / logoWidth;
float sy = (float) logoHaleHeight / logoHeight;
matrix.setScale(sx,sy);
//重新绘制Bitmap
Bitmap matrixLogoBitmap = Bitmap.createBitmap(logoBitmap, 0, 0, logoWidth, logoHeight, matrix, false);
int mtLogoWidth = matrixLogoBitmap.getWidth();
int mtLogoHidth = matrixLogoBitmap.getHeight();
//设置二维码相关属性
Map<EncodeHintType,Object> hintTypeStringMap = new HashMap<>();
hintTypeStringMap.put(EncodeHintType.MARGIN,2); //外边距
hintTypeStringMap.put(EncodeHintType.CHARACTER_SET,"utf8"); //设置编码
hintTypeStringMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);//设置最高错误级别
hintTypeStringMap.put(EncodeHintType.MAX_SIZE,LOGO_WIDTH_MAX); //设置最大值
hintTypeStringMap.put(EncodeHintType.MIN_SIZE,LOGO_WIDTH_MIN); // 设置最小值
BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE,QR_CODE_WIDTH
,QR_CODE_WIDTH,hintTypeStringMap);
//绘制二维码数组
int[] arr = new int[bitMatrix.getWidth() * bitMatrix.getHeight()];
/*
二维码位置
Left: 屏幕宽度的一半 - 二维码宽度的一半
Right: 屏幕宽度的一半 + 二维码宽度的一半
logo长度: Right - Left = logoSize
*/
for (int i = 0; i < bitMatrix.getHeight(); i++) {
for (int j = 0; j < bitMatrix.getWidth(); j++) {
/*
当坐标像素点恰好处于logo位置时,绘制logo 详情看图解
当宽度处于 logo图片区域位置
--->
并且当高度处于 logo图片区域位置时 绘制logo
matrixLogoBitmap.getPixel(x , y);
*/
if( j > bitMatrix.getWidth() / 2 - mtLogoWidth / 2
&& j < bitMatrix.getWidth() / 2 + mtLogoWidth / 2
&& i > bitMatrix.getHeight() / 2 - mtLogoHidth / 2
&& i < bitMatrix.getHeight() / 2 + mtLogoHidth / 2){
arr[i * bitMatrix.getWidth() + j] = matrixLogoBitmap.getPixel( j - bitMatrix.getWidth() / 2 +mtLogoWidth / 2
, i - bitMatrix.getHeight()/ 2 + mtLogoHidth / 2);
}else{
arr[i * bitMatrix.getWidth() + j] = bitMatrix.get(i,j)? BLACK : WHITE;
}
}
}
Bitmap bitmap = Bitmap.createBitmap(arr,bitMatrix.getWidth(), bitMatrix.getHeight(), Bitmap.Config.ARGB_8888);
return bitmap;
}
5.最终设置结果集
logoImg = findViewById(R.id.logo_img);
Bitmap bitmap = createBitmap(((BitmapDrawable) getDrawable(R.drawable.bg)).getBitmap()
, ((BitmapDrawable) getDrawable(R.drawable.logo)).getBitmap());
try {
Bitmap bitmapQR = createQRBitmap(bitmap, "带logo的二维码");
Glide.with(LogoQRCode.this).load(bitmapQR).into(logoImg);
} catch (WriterException e) {
e.printStackTrace();
}
}
6.效果图如下: