231 lines
10 KiB
Dart
231 lines
10 KiB
Dart
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import 'dart:async';
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import 'dart:convert';
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import 'package:bluetooth_print/bluetooth_print.dart';
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import 'package:bluetooth_print/bluetooth_print_model.dart';
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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void main() => runApp(MyApp());
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class MyApp extends StatefulWidget {
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@override
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_MyAppState createState() => _MyAppState();
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}
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class _MyAppState extends State<MyApp> {
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BluetoothPrint bluetoothPrint = BluetoothPrint.instance;
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bool _connected = false;
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BluetoothDevice? _device;
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String tips = 'no device connect';
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@override
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void initState() {
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super.initState();
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WidgetsBinding.instance.addPostFrameCallback((_) => initBluetooth());
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}
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// Platform messages are asynchronous, so we initialize in an async method.
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Future<void> initBluetooth() async {
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bluetoothPrint.startScan(timeout: Duration(seconds: 4));
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bool isConnected=await bluetoothPrint.isConnected??false;
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bluetoothPrint.state.listen((state) {
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print('******************* cur device status: $state');
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switch (state) {
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case BluetoothPrint.connected:
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setState(() {
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_connected = true;
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tips = 'connect success';
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});
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break;
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case BluetoothPrint.disconnected:
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setState(() {
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_connected = false;
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tips = 'disconnect success';
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});
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break;
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default:
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break;
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}
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});
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if (!mounted) return;
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if(isConnected) {
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setState(() {
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_connected=true;
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});
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}
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}
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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home: Scaffold(
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appBar: AppBar(
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title: const Text('BluetoothPrint example app'),
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),
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body: RefreshIndicator(
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onRefresh: () =>
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bluetoothPrint.startScan(timeout: Duration(seconds: 4)),
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child: SingleChildScrollView(
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child: Column(
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children: <Widget>[
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Row(
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mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
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Padding(
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padding: EdgeInsets.symmetric(vertical: 10, horizontal: 10),
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child: Text(tips),
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),
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],
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),
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Divider(),
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StreamBuilder<List<BluetoothDevice>>(
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stream: bluetoothPrint.scanResults,
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initialData: [],
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builder: (c, snapshot) => Column(
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children: snapshot.data!.map((d) => ListTile(
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title: Text(d.name??''),
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subtitle: Text(d.address??''),
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onTap: () async {
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setState(() {
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_device = d;
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});
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},
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trailing: _device!=null && _device!.address == d.address?Icon(
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Icons.check,
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color: Colors.green,
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):null,
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)).toList(),
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),
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),
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Divider(),
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Container(
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padding: EdgeInsets.fromLTRB(20, 5, 20, 10),
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child: Column(
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children: <Widget>[
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Row(
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mainAxisAlignment: MainAxisAlignment.center,
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children: <Widget>[
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OutlinedButton(
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child: Text('connect'),
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onPressed: _connected?null:() async {
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if(_device!=null && _device!.address !=null){
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setState(() {
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tips = 'connecting...';
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});
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await bluetoothPrint.connect(_device!);
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}else{
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setState(() {
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tips = 'please select device';
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});
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print('please select device');
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}
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},
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),
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SizedBox(width: 10.0),
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OutlinedButton(
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child: Text('disconnect'),
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onPressed: _connected?() async {
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setState(() {
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tips = 'disconnecting...';
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});
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await bluetoothPrint.disconnect();
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}:null,
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),
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],
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),
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Divider(),
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OutlinedButton(
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child: Text('print receipt(esc)'),
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onPressed: _connected?() async {
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Map<String, dynamic> config = Map();
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List<LineText> list = [];
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list.add(LineText(type: LineText.TYPE_TEXT, content: '**********************************************', weight: 1, align: LineText.ALIGN_CENTER,linefeed: 1));
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list.add(LineText(type: LineText.TYPE_TEXT, content: '打印单据头', weight: 1, align: LineText.ALIGN_CENTER, fontZoom: 2, linefeed: 1));
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list.add(LineText(type: LineText.TYPE_TEXT, content: '----------------------明细---------------------', weight: 1, align: LineText.ALIGN_CENTER, linefeed: 1));
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list.add(LineText(type: LineText.TYPE_TEXT, content: '物资名称规格型号', weight: 1, align: LineText.ALIGN_LEFT, x: 0,relativeX: 0, linefeed: 0));
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list.add(LineText(type: LineText.TYPE_TEXT, content: '单位', weight: 1, align: LineText.ALIGN_LEFT, x: 350, relativeX: 0, linefeed: 0));
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list.add(LineText(type: LineText.TYPE_TEXT, content: '数量', weight: 1, align: LineText.ALIGN_LEFT, x: 500, relativeX: 0, linefeed: 1));
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list.add(LineText(type: LineText.TYPE_TEXT, content: '混凝土C30', align: LineText.ALIGN_LEFT, x: 0,relativeX: 0, linefeed: 0));
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list.add(LineText(type: LineText.TYPE_TEXT, content: '吨', align: LineText.ALIGN_LEFT, x: 350, relativeX: 0, linefeed: 0));
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list.add(LineText(type: LineText.TYPE_TEXT, content: '12.0', align: LineText.ALIGN_LEFT, x: 500, relativeX: 0, linefeed: 1));
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list.add(LineText(type: LineText.TYPE_TEXT, content: '**********************************************', weight: 1, align: LineText.ALIGN_CENTER,linefeed: 1));
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ByteData data = await rootBundle.load("assets/images/bluetooth_print.png");
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List<int> imageBytes = data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes);
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String base64Image = base64Encode(imageBytes);
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// list.add(LineText(type: LineText.TYPE_IMAGE, content: base64Image, align: LineText.alignCenter, linefeed: 1));
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await bluetoothPrint.printReceipt(config, list);
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}:null,
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),
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OutlinedButton(
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child: Text('print label(tsc)'),
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onPressed: _connected?() async {
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Map<String, dynamic> config = Map();
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config['width'] = 40; // 标签宽度，单位mm
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config['height'] = 70; // 标签高度，单位mm
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config['gap'] = 2; // 标签间隔，单位mm
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// x、y坐标位置，单位dpi，1mm=8dpi
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List<LineText> list = [];
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list.add(LineText(type: LineText.TYPE_TEXT, x:10, y:10, content: 'A Title'));
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list.add(LineText(type: LineText.TYPE_TEXT, x:10, y:40, content: 'this is content'));
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list.add(LineText(type: LineText.TYPE_QRCODE, x:10, y:70, content: 'qrcode i\n'));
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list.add(LineText(type: LineText.TYPE_BARCODE, x:10, y:190, content: 'qrcode i\n'));
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List<LineText> list1 = [];
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ByteData data = await rootBundle.load("assets/images/guide3.png");
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List<int> imageBytes = data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes);
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String base64Image = base64Encode(imageBytes);
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list1.add(LineText(type: LineText.TYPE_IMAGE, x:10, y:10, content: base64Image,));
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await bluetoothPrint.printLabel(config, list);
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await bluetoothPrint.printLabel(config, list1);
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}:null,
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),
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OutlinedButton(
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child: Text('print selftest'),
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onPressed: _connected?() async {
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await bluetoothPrint.printTest();
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}:null,
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)
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],
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),
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)
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],
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),
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),
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),
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floatingActionButton: StreamBuilder<bool>(
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stream: bluetoothPrint.isScanning,
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initialData: false,
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builder: (c, snapshot) {
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if (snapshot.data == true) {
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return FloatingActionButton(
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child: Icon(Icons.stop),
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onPressed: () => bluetoothPrint.stopScan(),
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backgroundColor: Colors.red,
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);
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} else {
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return FloatingActionButton(
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child: Icon(Icons.search),
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onPressed: () => bluetoothPrint.startScan(timeout: Duration(seconds: 4)));
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}
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},
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),
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),
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);
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}
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}
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