ZXing生成无白边条形码
2019-11-01 本文已影响0人
番茄tomato
https://www.jianshu.com/p/a46b5aefa3ff
参考连接中的代码作了简化,StrToBrCode.class直接用
package de.safetytaxfree.tuishuibaoshangmiprinter.Printer;
import android.graphics.Bitmap;
import android.text.TextUtils;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.oned.Code128Writer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
import java.util.HashMap;
import java.util.Map;
public class StrToBrCode {
/**
@param expectWidth 期望的宽度
@param maxWidth 最大允许宽度
* @param contents 生成条形码的内容
* @param height
* @return
*/
public static Bitmap getBarCodeWithoutPadding(int expectWidth,int maxWidth,int height,String contents){
int realWidth = getBarCodeNoPaddingWidth(expectWidth,contents,maxWidth);
return syncEncodeBarcode(contents, realWidth, height,0);
}
private static int getBarCodeNoPaddingWidth(int expectWidth,String contents,int maxWidth){
boolean[] code = new Code128Writer(). encode(contents);
int inputWidth = code.length;
//code:210000000000000082 code.length:134 expectWidth:397 maxWidth:435
// Add quiet zone on both sides.
//int fullWidth = inputWidth + 0;
double outputWidth = (double) Math.max(expectWidth, inputWidth);
double multiple = outputWidth / inputWidth;
//multiple:2.962686567164179
//优先取大的
int returnVal =0;
int ceil = (int) Math.ceil(multiple);
if(inputWidth * ceil <= maxWidth){
returnVal = inputWidth * ceil;
}else {
int floor = (int) Math.floor(multiple);
returnVal = inputWidth * floor;
}
return returnVal;
}
/**
* 同步创建条形码图片
*
* @param content 要生成条形码包含的内容
* @param width 条形码的宽度,单位px
* @param height 条形码的高度,单位px
* @param textSize 字体大小,单位px,如果等于0则不在底部绘制文字
* @return 返回生成条形的位图
*
* 白边问题:
* https://blog.csdn.net/sunshinwong/article/details/50156017
*已知高度,计算宽度:
*
*/
private static Bitmap syncEncodeBarcode(String content, int width, int height, int textSize) {
if (TextUtils.isEmpty(content)) {
return null;
}
Map<EncodeHintType, Object> hints = new HashMap<>();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
hints.put(EncodeHintType.MARGIN, 0);
try {
BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.CODE_128, 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] = 0xff000000;
} else {
pixels[y * width + x] = 0xffffffff;
}
}
}
Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
if (textSize > 0) {
}
return bitmap;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}