在收银系统中经常使用到打印小票的功能。本文将Java如何实现商米POS收银机打印小票的功能。包括“”定义管理打印相关方法的类，封装好方法供外部调用”、“调用打印功能示例”。

1、定义管理打印相关方法的类，封装好方法供外部调用。

AidlUtil类封装了打印的方法。

创建打印服务的对象：

private ServiceConnection connService = new ServiceConnection() {@Overridepublic void onServiceConnected(ComponentName name, IBinder service) {woyouService = IWoyouService.Stub.asInterface(service);}@Overridepublic void onServiceDisconnected(ComponentName name) {woyouService = null;}
};

连接打印服务：

/*** 连接服务*/
@TargetApi(Build.VERSION_CODES.DONUT)
public void connectPrinterService(Context context) {this.context = context.getApplicationContext();Intent intent = new Intent();intent.setPackage(SERVICE_PACKAGE);intent.setAction(SERVICE_ACTION);context.getApplicationContext().startService(intent);context.getApplicationContext().bindService(intent, connService, Context.BIND_AUTO_CREATE);
}

断开打印服务：

/*
断开服务*/
public void disconnectPrinterService(Context context) {if (woyouService != null) {context.getApplicationContext().unbindService(connService);woyouService = null;}
}

设置打印浓度：

/*** 设置打印浓度*/
private int[] darkness = new int[]{0x0600, 0x0500, 0x0400, 0x0300, 0x0200, 0x0100, 0, 0xffff, 0xfeff, 0xfdff, 0xfcff, 0xfbff, 0xfaff};public void setDarkness(int index) {if (woyouService == null) {Toast.makeText(context, "The service has been disconnected!", Toast.LENGTH_SHORT).show();return;}int k = darkness[index];try {woyouService.sendRAWData(ESCUtil.setPrinterDarkness(k), null);woyouService.printerSelfChecking(null);} catch (RemoteException e) {e.printStackTrace();}
}

初始化打印机：

/*** 初始化打印机*/
public void initPrinter() {if (woyouService == null) {Toast.makeText(context, "The service has been disconnected!", Toast.LENGTH_SHORT).show();return;}try {woyouService.printerInit(null);} catch (RemoteException e) {e.printStackTrace();}
}

打印文字：

/*** 打印文字，，，，设置打印内容，字体大小，是否加粗，居中(靠左靠右)，下划线*/public void printText(String content, float size, boolean isBold, int gravity, boolean isUnderLine) {//Gravity.LEFT==51,,Gravity.CENTER==17,,Gravity.RIGHT==53if (woyouService == null) {Toast.makeText(context, "The service has been disconnected!", Toast.LENGTH_SHORT).show();return;}try {if (isBold) {woyouService.sendRAWData(ESCUtil.boldOn(), null);} else {woyouService.sendRAWData(ESCUtil.boldOff(), null);}if (gravity == 51) {woyouService.setAlignment(0, null);} else if (gravity == 17) {woyouService.setAlignment(1, null);} else if (gravity == 53) {woyouService.setAlignment(2, null);}if (isUnderLine) {woyouService.sendRAWData(ESCUtil.underlineWithOneDotWidthOn(), null);} else {woyouService.sendRAWData(ESCUtil.underlineOff(), null);}woyouService.printTextWithFont(content, null, size, null);woyouService.lineWrap(1, null);
//            woyouService.cutPaper(null);//切纸动作,如果打印机没有切刀，不会执行该动作} catch (RemoteException e) {e.printStackTrace();}}

打印图片：

/*** 打印图片*/
public void printBitmap(Bitmap bitmap) {if (woyouService == null) {Toast.makeText(context, "The service has been disconnected", Toast.LENGTH_SHORT).show();return;}try {woyouService.setAlignment(1, null);woyouService.printBitmap(bitmap, null);woyouService.lineWrap(1, null);} catch (RemoteException e) {e.printStackTrace();}
}

打印分割线：

//打印分割线public void printDivider(String delimiterToRepeat) {float fontSize = 20;int fontCenter = 17;delimiterToRepeat = delimiterToRepeat.equals("") ? " " : delimiterToRepeat;int delimiterToRepeatLength = GeneralUtil.string_length(delimiterToRepeat); // 打印时，中文是2字节，英文是1字节int aLineBytes; // 一行的字节if (getPrinterInfo().get(1).contains("T1mini") || getPrinterInfo().get(1).contains("T2mini")) {aLineBytes = 770;} else if (getPrinterInfo().get(1).contains("T1") || getPrinterInfo().get(1).contains("T2")) {//这是T2机用中文测出来的，15(fontSize)*38(个)*2=1140，不能大于1150(可等于)，中文占2个字节。aLineBytes = 1150;} else {aLineBytes = 0; // ... 暂时不知道还有其他什么型号}// 字符串拼接String printText = "";for (int j = 1; j <= aLineBytes / (delimiterToRepeatLength * fontSize); j++) {printText = printText.concat(delimiterToRepeat);}printText(printText, fontSize, true, fontCenter, false);
//            woyouService.lineWrap(1, null); // 太浪费纸了}

进行切刀：

//切刀
public void cutPaper() throws RemoteException {woyouService.cutPaper(null);//切纸动作,如果打印机没有切刀，不会执行该动作
}

走纸：

//走纸
public void linewrap(int num) {try {woyouService.lineWrap(num, null);} catch (RemoteException e) {e.printStackTrace();}
}

打印表格：

public void printTable(String[] colsTextArr, int[] colsWidthArr, int[] colsAlign) {try {woyouService.printColumnsString(colsTextArr, colsWidthArr, colsAlign, null);
//            linewrap(1); // 太浪费纸了} catch (RemoteException e) {e.printStackTrace();}}

2、调用打印功能示例。

private void printRetailTradeAggregation() {//打印跨天上班汇总小票try {AidlUtil.getInstance().printText("交班确认表", 35, false, 17, false);AidlUtil.getInstance().printText("注意：此交班小票为跨日期上班系统自动生成，请妥善保管以便对账。", 20, false, 17, false);AidlUtil.getInstance().printDivider("-");AidlUtil.getInstance().printText("上班时间：" + new SimpleDateFormat(Constants.DATE_FORMAT_Default).format(BaseActivity.retailTradeAggregation.getWorkTimeStart()), 25, false, 51, false);AidlUtil.getInstance().printText("下班时间：" + new SimpleDateFormat(Constants.DATE_FORMAT_Default).format(BaseActivity.retailTradeAggregation.getWorkTimeEnd()), 25, false, 51, false);AidlUtil.getInstance().printText("交班人：" + Constants.getCurrentStaff().getName(), 30, false, 51, false);AidlUtil.getInstance().linewrap(1);AidlUtil.getInstance().printText("------收银汇总------", 35, false, 17, false);AidlUtil.getInstance().printText("交易单数：" + BaseActivity.retailTradeAggregation.getTradeNO(), 30, false, 51, false);AidlUtil.getInstance().printText("营业额：" + BaseActivity.retailTradeAggregation.getAmount(), 30, false, 51, false);AidlUtil.getInstance().printText("准备金：" + BaseActivity.retailTradeAggregation.getReserveAmount(), 30, false, 51, false);AidlUtil.getInstance().printText("现金收入：" + BaseActivity.retailTradeAggregation.getCashAmount(), 30, false, 51, false);AidlUtil.getInstance().printText("微信收入：" + BaseActivity.retailTradeAggregation.getWechatAmount(), 30, false, 51, false);
//                            AidlUtil.getInstance().printText("支付宝收入：" + showAlipayAmount.getText().toString(), 30, false, 51, false);AidlUtil.getInstance().printDivider("-");AidlUtil.getInstance().printText("交班人签名：", 30, false, 51, false);AidlUtil.getInstance().linewrap(8);AidlUtil.getInstance().cutPaper();} catch (RemoteException e) {e.printStackTrace();}}