Flutter连接蓝牙打印机打印（含中文、双排打印）

1. 修改pubspec.yaml

  # 蓝牙打印
  blue_thermal_printer: ^1.2.3

2. 修改\android\app\src\main\AndroidManifest.xml

    <!-- 蓝牙打印权限 -->
    <uses-permission android:name="android.permission.BLUETOOTH" />
    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

3. 打印

  import 'dart:convert';
  import 'dart:typed_data';

  import 'package:blue_thermal_printer/blue_thermal_printer.dart';

  BlueThermalPrinter bluetooth = BlueThermalPrinter.instance;
  BluetoothDevice _device;


  /// 打印
  void dioPrint() async {
   
   
    List<BluetoothDevice> devices = await bluetooth.getBondedDevices(); //获取已配对
    if (devices.isEmpty) {
   
   
      await YDialogs.showError('请先自行蓝牙配对XXXX打印机', context