DCloud UniAPP Android 蓝牙连接ESCPOS打印机

1.蓝牙打印引用文件 btprinter.js

import context from "@/common/context.js" //上下文处理 用来保存绑定的蓝牙设备地址function searchDevices() {var main = plus.android.runtimeMainActivity();var IntentFilter = plus.android.importClass('android.content.IntentFilter');var BluetoothAdapter = plus.android.importClass("android.bluetooth.BluetoothAdapter");var BluetoothDevice = plus.android.importClass("android.bluetooth.BluetoothDevice");var BAdapter = BluetoothAdapter.getDefaultAdapter();console.log("开始搜索设备");var des = BAdapter.getBondedDevices();var devices = [];console.log(des);if (des) {var iter = plus.android.invoke(des, "iterator");console.log(iter);while (plus.android.invoke(iter, "hasNext")) {var next = plus.android.invoke(iter, "next");var dename = plus.android.invoke(next, "getName");console.log(dename);var deaddr = plus.android.invoke(next, "getAddress");console.log(deaddr);var bind = false;if (context.printer_mac) {console.log(context.printer_mac)if (deaddr == context.printer_mac) {bind = true}}devices.push({addr: deaddr,name: dename,bind: bind})}}return devices;
}function setPrinter(mac_address) {if (mac_address) {context.printer_mac = mac_address;}
}function printImg(img) {var mac_address = context.printer_mac;if (!mac_address) {return '蓝牙打印机未连接';}if (img) {var main = plus.android.runtimeMainActivity();var BluetoothAdapter = plus.android.importClass("android.bluetooth.BluetoothAdapter");var UUID = plus.android.importClass("java.util.UUID");var uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");var BAdapter = BluetoothAdapter.getDefaultAdapter();var device = BAdapter.getRemoteDevice(mac_address);plus.android.importClass(device);var bluetoothSocket = device.createRfcommSocketToServiceRecord(uuid);plus.android.importClass(bluetoothSocket);if (!bluetoothSocket.isConnected()) {console.log('检测到设备未连接，尝试连接....');bluetoothSocket.connect();}console.log('设备已连接');if (bluetoothSocket.isConnected()) {var outputStream = bluetoothSocket.getOutputStream();plus.android.importClass(outputStream);var reset = [0x1b, 0x40]var print = [0x0a]outputStream.write(reset);outputStream.flush();outputStream.write(print);console.log("write img")outputStream.write(img);outputStream.write(reset);//走纸outputStream.write(print);outputStream.write(print);outputStream.flush();console.log('end print2')device = null //这里关键  bluetoothSocket.close(); //必须关闭蓝牙连接否则意外断开的话打印错误 console.log('end print3')return "1";}} else {return "没有输入打印内容";}
}function print(print_texts) {var mac_address = context.printer_mac;if (!mac_address) {return '蓝牙打印机未连接';}if (print_texts) {var main = plus.android.runtimeMainActivity();var BluetoothAdapter = plus.android.importClass("android.bluetooth.BluetoothAdapter");var UUID = plus.android.importClass("java.util.UUID");var uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");var BAdapter = BluetoothAdapter.getDefaultAdapter();var device = BAdapter.getRemoteDevice(mac_address);plus.android.importClass(device);var bluetoothSocket = device.createRfcommSocketToServiceRecord(uuid);plus.android.importClass(bluetoothSocket);if (!bluetoothSocket.isConnected()) {console.log('检测到设备未连接，尝试连接....');bluetoothSocket.connect();}console.log('设备已连接');if (bluetoothSocket.isConnected()) {var outputStream = bluetoothSocket.getOutputStream();plus.android.importClass(outputStream);var arr = [];if (Array.isArray(print_texts)) {// console.log("start print Text  lines:" + print_texts.length)arr = print_texts;} else {// console.log("start print one Text")arr.push(print_texts.toString());}console.log("start print arr:" + arr)var reset = [0x1b, 0x40]var print = [0x0a]outputStream.write(reset);//一行行的打印for (var i = 0; i < arr.length; i++) {var datastr = arr[i];console.log("start print arr:" + arr[i] + ";" + arr)if (Array.isArray(datastr)) {//带字体大小定义var first = datastr[0];if (datastr.length > 2) {//行内自定义for (var j = 0; j < datastr.length; j += 2) {if (datastr.length > j + 1) {var tfirst = datastr[j];var tstr = datastr[j + 1];writeBig(tfirst, tstr, outputStream, false); //false标示不换行}}outputStream.write(print); //全部打完再换行console.log('end print')} else if (datastr.length > 1) {writeBig(first, datastr[1], outputStream, true);}} else {outputStream.write(0x1c);outputStream.write(0x21);outputStream.write(1);var bytes = plus.android.invoke(datastr, 'getBytes', 'gbk');outputStream.write(bytes);outputStream.write(print);}}//走纸outputStream.write(print);outputStream.write(print);outputStream.flush();console.log('end print2')device = null //这里关键  bluetoothSocket.close(); //必须关闭蓝牙连接否则意外断开的话打印错误 console.log('end print3')return "1";}} else {return "没有输入打印内容";}
}function writeBig(first, str, outputStream, br) {var print = [0x0a]outputStream.write(0x1c);outputStream.write(0x21);outputStream.write(1);if (first.toLowerCase() == "n") {//正常大小var bytes = plus.android.invoke(str, 'getBytes', 'gbk');outputStream.write(bytes);if (br)outputStream.write(print);} else if (first.toLowerCase() == "w") {//横向加宽outputStream.write(0x1c);outputStream.write(0x21);outputStream.write(4);var bytes = plus.android.invoke(str, 'getBytes', 'gbk');outputStream.write(bytes);if (br)outputStream.write(print);} else if (first.toLowerCase() == "h") {//纵向加高outputStream.write(0x1c);outputStream.write(0x21);outputStream.write(8);var bytes = plus.android.invoke(str, 'getBytes', 'gbk');outputStream.write(bytes);if (br)outputStream.write(print);} else if (first.toLowerCase() == "wh") {//横向加宽并纵向加高outputStream.write(0x1c);outputStream.write(0x21);outputStream.write(12);var bytes = plus.android.invoke(str, 'getBytes', 'gbk');outputStream.write(bytes);if (br)outputStream.write(print);}}const printer = {print: print,searchDevices: searchDevices,setPrinter: setPrinter,printImg: printImg
}
module.exports = printer

使用该蓝牙处理类，需要先然设备配对蓝牙打印设备，方法说明如下：

searchDevices()	用于搜索已配对蓝牙设备
setPrinter()	指定已配对设备为当前打印设备
print()	打印文本
printImg()	打印图片

打印文本示例

import printer from "btprinter.js"//打印单行
var res = printer.print("系统测试页打印");
//打印多行
var arr = ["软件测试页打印",["w", "aaa加宽"],["h", "bbb加高"],["wh", "加大"],new Date().toDateString(),["n", "默认大小", "w", "加宽", "h", "加高", "wh", "加大", "n", "默认大小"]];
var res = printer.print(arr);
if (res == "1") {} else {uni.showModal({showCancel: false,title: "打印测试页失败",content: res})
}

打印图片

var img=XXXXX //图片点阵灰度数据
printer.printImg(img);

图片点阵数据如何生成，如何打印二维码数据

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