最近一期做WiFi打印机打印小票功能，其中有一个功能点是把Logo打印在小票上面。
实现思路就是对网上的思路进行一下调整修改，方便Android端调用，很简单；
测试的打印机型号：Zebra GK888T
Bitmap to ZPL
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/**
* 把Bitmap –> ZPL, 拼接成一个ZPL命令
*/
public class ZPLImageConverter {
private Context context;
public ZPLImageConverter(Context context) {
this.context = context;
}
private int blackLimit = 380;
private int total;
private int widthBytes;
private boolean compressHex = false;
private static Map<Integer, String> mapCode = new HashMap<Integer, String>();
{
mapCode.put(1, “G”);
mapCode.put(2, “H”);
mapCode.put(3, “I”);
mapCode.put(4, “J”);
mapCode.put(5, “K”);
mapCode.put(6, “L”);
mapCode.put(7, “M”);
mapCode.put(8, “N”);
mapCode.put(9, “O”);
mapCode.put(10, “P”);
mapCode.put(11, “Q”);
mapCode.put(12, “R”);
mapCode.put(13, “S”);
mapCode.put(14, “T”);
mapCode.put(15, “U”);
mapCode.put(16, “V”);
mapCode.put(17, “W”);
mapCode.put(18, “X”);
mapCode.put(19, “Y”);
mapCode.put(20, “g”);
mapCode.put(40, “h”);
mapCode.put(60, “i”);
mapCode.put(80, “j”);
mapCode.put(100, “k”);
mapCode.put(120, “l”);
mapCode.put(140, “m”);
mapCode.put(160, “n”);
mapCode.put(180, “o”);
mapCode.put(200, “p”);
mapCode.put(220, “q”);
mapCode.put(240, “r”);
mapCode.put(260, “s”);
mapCode.put(280, “t”);
mapCode.put(300, “u”);
mapCode.put(320, “v”);
mapCode.put(340, “w”);
mapCode.put(360, “x”);
mapCode.put(380, “y”);
mapCode.put(400, “z”);
}
public String convertFromImg(Bitmap image) throws IOException {
String cuerpo = createBody(image);
if(compressHex)
cuerpo = encodeHexAscii(cuerpo);
return headDoc() + cuerpo + footDoc();
}
private String createBody(Bitmap originalImage) throws IOException {
StringBuffer sb = new StringBuffer();
// Graphics2D graphics = originalImage.createGraphics();
// graphics.drawImage(originalImage, 0, 0, null);
int height = originalImage.getHeight();
int width = originalImage.getWidth();
int rgb, red, green, blue, index=0;
char auxBinaryChar[] = {‘0’, ‘0’, ‘0’, ‘0’, ‘0’, ‘0’, ‘0’, ‘0’};
widthBytes = width/8;
if(width%8 > 0){
widthBytes= (((int)(width / 8)) + 1);
} else {
widthBytes= width/8;
}
this.total = widthBytes*height;
for (int h = 0; h<height; h++)
{
for (int w = 0; w<width; w++)
{
// rgb = originalImage.getRGB(w, h);
rgb = originalImage.getPixel(w, h);
red = (rgb >> 16 ) & 0x000000FF;
green = (rgb >> 8 ) & 0x000000FF;
blue = (rgb) & 0x000000FF;
char auxChar = ‘1’;
int totalColor = red + green + blue;
if(totalColor>blackLimit){
auxChar = ‘0’;
}
auxBinaryChar[index] = auxChar;
index++;
if(index==8 || w==(width-1)){
sb.append(fourByteBinary(new String(auxBinaryChar)));
auxBinaryChar = new char[]{‘0’, ‘0’, ‘0’, ‘0’, ‘0’, ‘0’, ‘0’, ‘0’};
index=0;
}
}
sb.append(“\n”);
}
return sb.toString();
}
private String fourByteBinary(String binaryStr){
int decimal = Integer.parseInt(binaryStr,2);
if (decimal>15){
return Integer.toString(decimal,16).toUpperCase();
} else {
return “0” + Integer.toString(decimal,16).toUpperCase();
}
}
private String encodeHexAscii(String code){
int maxlinea = widthBytes * 2;
StringBuffer sbCode = new StringBuffer();
StringBuffer sbLinea = new StringBuffer();
String previousLine = null;
int counter = 1;
char aux = code.charAt(0);
boolean firstChar = false;
for(int i = 1; i< code.length(); i++ ){
if(firstChar){
aux = code.charAt(i);
firstChar = false;
continue;
}
if(code.charAt(i)==‘\n’){
if(counter>=maxlinea && aux==‘0’){
sbLinea.append(“,”);
} else if(counter>=maxlinea && aux==‘F’){
sbLinea.append(“!”);
} else if (counter>20){
int multi20 = (counter/20)*20;
int resto20 = (counter%20);
sbLinea.append(mapCode.get(multi20));
if(resto20!=0){
sbLinea.append(mapCode.get(resto20) + aux);
} else {
sbLinea.append(aux);
}
} else {
sbLinea.append(mapCode.get(counter) + aux);
if(mapCode.get(counter)==null){
}
}
counter = 1;
firstChar = true;
if(sbLinea.toString().equals(previousLine)){
sbCode.append(“:”);
} else {
sbCode.append(sbLinea.toString());
}
previousLine = sbLinea.toString();
sbLinea.setLength(0);
continue;
}
if(aux == code.charAt(i)){
counter++;
} else {
if(counter>20){
int multi20 = (counter/20)*20;
int resto20 = (counter%20);
sbLinea.append(mapCode.get(multi20));
if(resto20!=0){
sbLinea.append(mapCode.get(resto20) + aux);
} else {
sbLinea.append(aux);
}
} else {
sbLinea.append(mapCode.get(counter) + aux);
}
counter = 1;
aux = code.charAt(i);
}
}
return sbCode.toString();
}
private String headDoc() {
String str = /*”^XA ” +*/
“^FO10,50^GFA,”+ total + “,”+ total + “,” + widthBytes +“, “;
return str;
}
private String footDoc(){
String str = “^FS”/*+ “^XZ”*/;
return str;
}
public void setCompressHex(boolean compressHex) {
this.compressHex = compressHex;
}
public void setBlacknessLimitPercentage(int percentage){
blackLimit = (percentage * 768 / 100);
}
}
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调用方式
就是把Bitmap对象转化为ZPL编码格式，并把转化后的内容塞到ZPL命令中，和打印机通过Wifi 连接，把组装后的命令发给打印机就可以了。
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ZPLImageConverter zp = new ZPLImageConverter(context);
zp.setCompressHex(true);
zp.setBlacknessLimitPercentage(50);
String str = zp.convertFromImg(myBitmap);
zplStr += str;
//…
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其它命令的时候可以参考zebra打印机官方文档。
refs
- http://labelary.com/viewer.html （在线调整打印小票样式细节）
- http://www.jcgonzalez.com/java-image-to-zpl-example
- https://jinfengli.github.io/2017/11/17/zebra_printer_logo/
