Android集成佳博热敏打印机打印小票对齐问题
一、说明
比如：商品名、单价、数量、金额，它们的排列需要像表格一样对齐。
二、实现
主要用到的API：
// 设置单位距离
esc.addSetHorAndVerMotionUnits((byte) 7, (byte) 0);
// 移动的距离（距离 = 单位 * position设定值)
esc.addSetAbsolutePrintPosition(20);但这个对齐其实是有问题的，它的值的计算可以参考《佳博热敏票据打印机编程手册》，文档给出的是你将移动单位长度设置为7，这个长度大约等于1个字的长度，但是不够精准，其实际长度略有偏差，比较坑的一点就是这个距离并不能设定为小数，只能精确到整数位，我的做法是将单位长度设定为整个字的1/3，这样就可以更加精准一些。
public static final short PRINT_POSITION_0 = 0;
public static final short PRINT_POSITION_1 = 26 * 3;
public static final short PRINT_POSITION_2 = 32 * 3;
public static final short PRINT_POSITION_3 = 42 * 3;
public static final int MAX_GOODS_NAME_LENGTH = 22 * 3;
// 将unit设置为这个单位值，其实际距离大约是一个字的1/3
public static final short PRINT_UNIT = 43;// 商品头信息
esc.addSetHorAndVerMotionUnits((byte) PRINT_UNIT, (byte) 0);
esc.addText("商品名");
esc.addSetAbsolutePrintPosition(PRINT_POSITION_1);
esc.addText("单价");
esc.addSetAbsolutePrintPosition(PRINT_POSITION_2);
esc.addText("数量");
esc.addSetAbsolutePrintPosition(PRINT_POSITION_3);
esc.addText("金额");在这样的设置下，基本可以对齐并占满整个小票打印纸，而具体的商品信息你则可以以这些位置为基准进行具体放置。
三、贴上格式化的全部代码
public class PrintSplitUtil {
private static final String PRINT_LINE = "------------------------------------------------\n";
public static final int PRINT_TOTAL_LENGTH = 48 * 3;
public static final short PRINT_POSITION_0 = 0;
public static final short PRINT_POSITION_1 = 26 * 3;
public static final short PRINT_POSITION_2 = 32 * 3;
public static final short PRINT_POSITION_3 = 42 * 3;
public static final int MAX_GOODS_NAME_LENGTH = 22 * 3;
public static final short PRINT_UNIT = 43;
public static PrinterSplitInfo getPrintText(Context context, GoodsListInfo goodsInfo, String store, String userMobile, String qrCode) {
PrinterSplitInfo printerSplitInfo = new PrinterSplitInfo();
EscCommand esc = new EscCommand();
esc.addInitializePrinter();
// 顶部图片
esc.addSelectJustification(JUSTIFICATION.CENTER);
Bitmap b = BitmapFactory.decodeResource(context.getResources(), R.mipmap.printer_logo);
esc.addRastBitImage(b, 200, 0); // 打印图片
esc.addPrintAndLineFeed();
esc.addText(PRINT_LINE);
// 订单信息
if (!TextUtils.isEmpty(store)) {
esc.addSelectJustification(JUSTIFICATION.LEFT);
esc.addSelectPrintModes(FONT.FONTA, ENABLE.ON, ENABLE.OFF, ENABLE.OFF, ENABLE.OFF);
esc.addText(store + "\n"); // 打印文字
}
esc.addSelectJustification(JUSTIFICATION.LEFT);
esc.addSelectPrintModes(FONT.FONTA, ENABLE.OFF, ENABLE.OFF, ENABLE.OFF, ENABLE.OFF);
// 头部信息
esc.addText("打印编号：" + goodsInfo.express_sn);
esc.addPrintAndLineFeed();
esc.addText("操作时间：" + DateTimeUtil.getCurrentDateTime());
esc.addPrintAndLineFeed();
esc.addText("操作员：" + userMobile);
esc.addPrintAndLineFeed();
esc.addText(PRINT_LINE);
// 商品头信息
esc.addSetHorAndVerMotionUnits((byte) PRINT_UNIT, (byte) 0);
esc.addText("商品名");
esc.addSetAbsolutePrintPosition(PRINT_POSITION_1);
esc.addText("单价");
esc.addSetAbsolutePrintPosition(PRINT_POSITION_2);
esc.addText("数量");
esc.addSetAbsolutePrintPosition(PRINT_POSITION_3);
esc.addText("金额");
esc.addPrintAndLineFeed();
// 商品信息
if (goodsInfo.goods_list != null && goodsInfo.goods_list.size() > 0) {
esc.addSelectPrintModes(FONT.FONTA, ENABLE.OFF, ENABLE.ON, ENABLE.OFF, ENABLE.OFF);
for (int i = 0; i < goodsInfo.goods_list.size(); i++) {
GoodsListInfo.GoodsListBean goods = goodsInfo.goods_list.get(i);
String[] goodsNames = SubByteString.getSubedStrings(goods.goods_name, 20);
printerSplitInfo.dataRow += goodsNames.length;
// 商品名称
if (goodsNames != null && goodsNames.length > 0) {
esc.addText((i + 1) + "." + goodsNames[0]);
} else {
esc.addText((i + 1) + "." + goods.goods_name);
}
esc.addSetHorAndVerMotionUnits((byte) PRINT_UNIT, (byte) 0);
// 单价
short priceLength = (short) goods.goods_price.length();
short pricePosition = (short) (PRINT_POSITION_1 + 12 - priceLength * 3);
esc.addSetAbsolutePrintPosition(pricePosition);
esc.addText(goods.goods_price); // 单价还未获取
// 数量
short numLength = (short) (goods.goods_num + goods.goods_unit).getBytes().length;
short numPosition = (short) (PRINT_POSITION_2 + 14 - numLength * 3);
esc.addSetAbsolutePrintPosition(numPosition);
esc.addText(goods.goods_num + goods.goods_unit);
// 金额
short amountLength = (short) goods.goods_amount.replace(" ", "").getBytes().length;
short amountPosition = (short) (PRINT_POSITION_3 + 11 - amountLength * 3);
esc.addSetAbsolutePrintPosition(amountPosition);
esc.addText(goods.goods_amount);
if (goodsNames == null || goodsNames.length == 0) {
esc.addPrintAndLineFeed();
} else if (goodsNames != null && goodsNames.length > 1) {
for (int j = 1; j < goodsNames.length; j++) {
esc.addText("" + goodsNames[j]);
esc.addPrintAndLineFeed();
}
}
}
esc.addSelectPrintModes(FONT.FONTA, ENABLE.OFF, ENABLE.OFF, ENABLE.OFF, ENABLE.OFF);
esc.addText(PRINT_LINE);
}
// 总计信息
esc.addSelectJustification(JUSTIFICATION.RIGHT);// 设置打印居右
if (!TextUtils.isEmpty(goodsInfo.subsidy)) {
esc.addText("优惠补贴：" + goodsInfo.subsidy + "元\n");
}
if (!TextUtils.isEmpty(goodsInfo.goods_amount)) {
esc.addText("金额总计：" + goodsInfo.goods_amount + "元\n");
}
if (!TextUtils.isEmpty(goodsInfo.order_amount)) {
esc.addText("还需支付：" + goodsInfo.order_amount + "元\n");
}
esc.addText(PRINT_LINE);
// 打印二维码
if (!TextUtils.isEmpty(qrCode)) {
esc.addPrintAndLineFeed();
esc.addSelectJustification(JUSTIFICATION.CENTER);// 设置打印居中
esc.addText("请打开微信，扫码付款\n");
esc.addPrintAndLineFeed();
// 48 49 50 51
esc.addSelectErrorCorrectionLevelForQRCode((byte) 0x31); // 设置纠错等级
esc.addSelectSizeOfModuleForQRCode((byte) 7);// 设置qrcode模块大小
esc.addStoreQRCodeData(qrCode);// 设置qrcode内容
esc.addPrintQRCode();// 打印QRCode
esc.addPrintAndLineFeed();
esc.addText("请将二维码放平整后再扫码\n");
}
esc.addPrintAndFeedLines((byte) 3);
// 加入查询打印机状态，打印完成后，此时会接收到GpCom.ACTION_DEVICE_STATUS广播
esc.addQueryPrinterStatus();
// 最终数据
Vector datas = esc.getCommand();
byte[] bytes = GpUtils.ByteTo_byte(datas);
String result = Base64.encodeToString(bytes, Base64.DEFAULT);
printerSplitInfo.data = result;
return printerSplitInfo;
}
} 四、小票样式展示
