bluetooth_print 2.0.0

pub package

Introduction #

BluetoothPrint is a bluetooth plugin for Flutter, a new mobile SDK to help developers build bluetooth thermal printer apps for both iOS and Android.(for example, Gprinter pt-280、pt-380、gp-1324、gp-2120 eg.)

verison #

2.0.0(flutter 1.12)
1.2.0(flutter 1.9)

Features #

AndroidiOSDescription
scanStarts a scan for Bluetooth Low Energy devices.
connectEstablishes a connection to the device.
disconnectCancels an active or pending connection to the device.
stateStream of state changes for the Bluetooth Device.
print test messageprint device test message.
print textprint custom text, support layout.
print imageprint image.
print qrcodeprint qrcode,support change size.
print barcodeprint barcode

Usage #

Example

To use this plugin :

  dependencies:
    flutter:
      sdk: flutter
    bluetooth_print:
  • init a BluetoothPrint instance
import 'package:bluetooth_print/bluetooth_print.dart';
import 'package:bluetooth_print/bluetooth_print_model.dart';


BluetoothPrint bluetoothPrint = BluetoothPrint.instance;

scan #

// begin scan
bluetoothPrint.startScan(timeout: Duration(seconds: 4));

// get devices
StreamBuilder<List<BluetoothDevice>>(
    stream: bluetoothPrint.scanResults,
    initialData: [],
    builder: (c, snapshot) => Column(
      children: snapshot.data.map((d) => ListTile(
        title: Text(d.name??''),
        subtitle: Text(d.address),
        onTap: () async {
          setState(() {
            _device = d;
          });
        },
        trailing: _device!=null && _device.address == d.address?Icon(
          Icons.check,
          color: Colors.green,
        ):null,
      )).toList(),
    ),
  ),

connect #

await bluetoothPrint.connect(_device);

disconnect #

await bluetoothPrint.disconnect();

listen state #

      bluetoothPrint.state.listen((state) {
      print('cur device status: $state');

      switch (state) {
        case BluetoothPrint.CONNECTED:
          setState(() {
            _connected = true;
          });
          break;
        case BluetoothPrint.DISCONNECTED:
          setState(() {
            _connected = false;
          });
          break;
        default:
          break;
      }
    });
    Map<String, dynamic> config = Map();
    List<LineText> list = List();
    list.add(LineText(type: LineText.TYPE_TEXT, content: 'A Title', weight: 1, align: LineText.ALIGN_CENTER,linefeed: 1));
    list.add(LineText(type: LineText.TYPE_TEXT, content: 'this is conent left', weight: 0, align: LineText.ALIGN_LEFT,linefeed: 1));
    list.add(LineText(type: LineText.TYPE_TEXT, content: 'this is conent right', align: LineText.ALIGN_RIGHT,linefeed: 1));
    list.add(LineText(linefeed: 1));
    list.add(LineText(type: LineText.TYPE_BARCODE, content: 'A12312112', size:10, align: LineText.ALIGN_CENTER, linefeed: 1));
    list.add(LineText(linefeed: 1));
    list.add(LineText(type: LineText.TYPE_QRCODE, content: 'qrcode i', size:10, align: LineText.ALIGN_CENTER, linefeed: 1));
    list.add(LineText(linefeed: 1));

    ByteData data = await rootBundle.load("assets/images/guide3.png");
    List<int> imageBytes = data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes);
    String base64Image = base64Encode(imageBytes);
    list.add(LineText(type: LineText.TYPE_IMAGE, content: base64Image, align: LineText.ALIGN_CENTER, linefeed: 1));

    await bluetoothPrint.printReceipt(config, list);
    Map<String, dynamic> config = Map();
    config['width'] = 40; // 标签宽度,单位mm
    config['height'] = 70; // 标签高度,单位mm
    config['gap'] = 2; // 标签间隔,单位mm

    // x、y坐标位置,单位dpi,1mm=8dpi
    List<LineText> list = List();
    list.add(LineText(type: LineText.TYPE_TEXT, x:10, y:10, content: 'A Title'));
    list.add(LineText(type: LineText.TYPE_TEXT, x:10, y:40, content: 'this is content'));
    list.add(LineText(type: LineText.TYPE_QRCODE, x:10, y:70, content: 'qrcode i\n'));
    list.add(LineText(type: LineText.TYPE_BARCODE, x:10, y:190, content: 'qrcode i\n'));

    List<LineText> list1 = List();
    ByteData data = await rootBundle.load("assets/images/guide3.png");
    List<int> imageBytes = data.buffer.asUint8List(data.offsetInBytes, data.lengthInBytes);
    String base64Image = base64Encode(imageBytes);
    list1.add(LineText(type: LineText.TYPE_IMAGE, x:10, y:10, content: base64Image,));

    await bluetoothPrint.printLabel(config, list);
    await bluetoothPrint.printLabel(config, list1);

Troubleshooting #

ios import third party library #

[Please Read link: https://stackoverflow.com/questions/19189463/cocoapods-podspec-issue)
*.podspec add:

# .a filename must begin with lib, eg. 'libXXX.a'
s.vendored_libraries = '**/*.a'

error:'State restoration of CBCentralManager is only allowed for applications that have specified the "bluetooth-central" background mode' #

info.plist add:

<key>NSBluetoothAlwaysUsageDescription</key>
<string>Allow App use bluetooth?</string>
<key>NSBluetoothPeripheralUsageDescription</key>
<string>Allow App use bluetooth?</string>
<key>UIBackgroundModes</key>
<array>
    <string>bluetooth-central</string>
    <string>bluetooth-peripheral</string>
</array>

Thanks For #

2.0.0 #

  • adaptation flutter 1.23.13.

1.2.0 #

  • fix ios library auto import bug.

1.1.0 #

  • opt ios config.

1.0.1 #

  • opt log.

1.0.0 #

  • support ios print label(tsc command) and receipt(esc command).

0.1.2 #

  • support print label(tsc command).

0.1.1 #

  • support more gprinter devices.

0.1.0 #

  • finished android features.

0.0.5 #

  • fixed some bugs, opt readme.

0.0.4 #

  • fixed some bugs.

0.0.3 #

  • opt android print, add status display.

0.0.2 #

  • add android print support.

0.0.1 #

  • initial release.

example/README.md

bluetooth_print_example #

Demonstrates how to use the bluetooth_print plugin.

Getting Started #

This project is a starting point for a Flutter application.

A few resources to get you started if this is your first Flutter project:

For help getting started with Flutter, view our online documentation, which offers tutorials, samples, guidance on mobile development, and a full API reference.

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:


dependencies:
  bluetooth_print: ^2.0.0

2. Install it

You can install packages from the command line:

with Flutter:


$ flutter pub get

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:


import 'package:bluetooth_print/bluetooth_print.dart';
  
Popularity:
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76
Health:
Code health derived from static analysis. [more]
100
Maintenance:
Reflects how tidy and up-to-date the package is. [more]
100
Overall:
Weighted score of the above. [more]
88
Learn more about scoring.

We analyzed this package on Feb 12, 2020, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.7.1
  • pana: 0.13.5
  • Flutter: 1.12.13+hotfix.7

Dependencies

Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.1.0 <3.0.0
flutter 0.0.0
json_annotation ^3.0.1 3.0.1
rxdart ^0.23.1 0.23.1
Transitive dependencies
collection 1.14.11 1.14.12
meta 1.1.8
sky_engine 0.0.99
typed_data 1.1.6
vector_math 2.0.8
Dev dependencies
build_runner ^1.0.0
flutter_test
json_serializable ^3.2.2