flutter_bt_print 0.0.1 
flutter_bt_print: ^0.0.1 copied to clipboard
Bluetooth thermal printing plugin for Flutter supporting ESC/POS printers, image and PDF printing.
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bt_print/flutter_bt_print.dart';
import 'package:permission_handler/permission_handler.dart';
import 'bluetooth_controller.dart';
void main() {
WidgetsFlutterBinding.ensureInitialized();
runApp(const MyApp());
}
class MyApp extends StatefulWidget {
const MyApp({super.key});
@override
State<MyApp> createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
final BluetoothController bt = BluetoothController();
BluetoothDevice? _selected;
@override
void initState() {
super.initState();
_initBluetooth();
bt.status$.listen((status) {
if (!mounted) return;
String msg = "";
if (status == BTStatus.connecting) msg = "Establishing connection...";
if (status == BTStatus.connected) msg = "Printer connected successfully!";
if (status == BTStatus.disconnected) msg = "Printer disconnected.";
if (status == BTStatus.error) msg = "Connection failed. Check printer.";
if (msg.isNotEmpty) {
PremiumToast.show(context, msg, status);
}
});
}
Future<void> _initBluetooth() async {
final granted = await _requestPermissions();
if (!granted) return;
await bt.loadDevices();
await bt.syncConnection();
}
Future<bool> _requestPermissions() async {
final statuses = await [
Permission.bluetooth,
Permission.bluetoothScan,
Permission.bluetoothConnect,
Permission.location,
].request();
return statuses.values.every((e) => e.isGranted);
}
@override
void dispose() {
bt.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
theme: ThemeData(),
home: Scaffold(
backgroundColor: const Color(0xFFF5F7FA),
appBar: AppBar(
toolbarHeight: 65,
title: Column(
children: [
const Text("flutter_bt_print",
style: TextStyle(fontWeight: FontWeight.w900, fontSize: 18),
),
Text(bt.systemOS, style: TextStyle(fontSize: 12)),
],
),
centerTitle: true,
elevation: 0,
backgroundColor: Colors.white,
foregroundColor: Colors.black,
),
body: Stack(
children: [
SingleChildScrollView(
padding: const EdgeInsets.all(20),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
_buildSectionHeader("Available Printers", Icons.bluetooth),
const SizedBox(height: 12),
_buildDeviceSelector(),
const SizedBox(height: 24),
_buildSectionHeader("Connection Status", Icons.settings_input_component),
const SizedBox(height: 12),
_buildConnectionCard(),
const SizedBox(height: 24),
_buildSectionHeader("Actions", Icons.print_rounded),
const SizedBox(height: 12),
_buildPrintActionCard(),
],
),
),
StreamBuilder<BTStatus>(
stream: bt.status$,
builder: (context, snapshot) {
final status = snapshot.data;
if (status == BTStatus.connecting) {
return Center(
child: CupertinoActivityIndicator(color: CupertinoColors.activeBlue),
);
}
return const SizedBox.shrink();
},
),
],
),
),
);
}
void printText() async {
return bt.printText(
"================================\n"
" MY PROFILE\n"
"================================\n\n"
"Name : Rahman\n"
"Role : Full Stack Developer\n"
"Phone : +91 8052399848\n"
"Email : rahman.infodev@gmail.com\n\n"
"--------------------------------\n"
"SKILLS\n"
"--------------------------------\n"
"• Flutter / Dart\n"
"• Android (Java / Kotlin)\n"
"• REST APIs\n"
"• Firebase / AWS\n\n"
"--------------------------------\n"
"EXPERIENCE\n"
"--------------------------------\n"
"• 4+ Years Mobile Development\n"
"• Production Apps Published\n\n"
"--------------------------------\n"
"PRINT INFO\n"
"--------------------------------\n"
"Date : 30 Jan 2026\n"
"Time : 10:55 AM\n\n"
"================================\n"
" THANK YOU 🙏\n"
"================================\n\n\n",
);
}
Widget _buildSectionHeader(String title, IconData icon) {
return Row(
children: [
Icon(icon, size: 18, color: Colors.blueGrey),
const SizedBox(width: 8),
Text(title.toUpperCase(),
style: const TextStyle(fontSize: 13,
fontWeight: FontWeight.w800, color: Colors.blueGrey,
letterSpacing: 1.2,
),
),
],
);
}
Widget _buildDeviceSelector() {
return Container(
padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 4),
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.circular(15),
boxShadow: [
BoxShadow(
color: Colors.black.withValues(alpha: 0.05),
blurRadius: 10,
),
],
),
child: StreamBuilder<List<BluetoothDevice>>(
stream: bt.devices$,
builder: (context, snapshot) {
final devices = snapshot.data ?? [];
BluetoothDevice? currentSelection;
try {
currentSelection = devices.firstWhere((d) => d.address == _selected?.address);
} catch (_) {
currentSelection = null;
}
return DropdownButtonHideUnderline(
child: DropdownButton<BluetoothDevice>(
isExpanded: true,
value: currentSelection,
hint: const Text("Select a paired printer"),
items: devices.map((data) {
return DropdownMenuItem<BluetoothDevice>(
value: data,
child: Row(
children: [
Icon(Icons.print_rounded, size: 18,
color: data.isConnected ? Colors.green : Colors.grey,
),
const SizedBox(width: 10),
Text(data.name,
style: const TextStyle(fontWeight: FontWeight.w500),
),
],
),
);
}).toList(),
onChanged: (d) {
setState(() => _selected = d);
},
),
);
},
),
);
}
Widget _buildConnectionCard() {
return StreamBuilder<bool>(
stream: bt.isConnected$,
builder: (context, snapshot) {
final connected = snapshot.data ?? false;
return Container(
padding: const EdgeInsets.all(20),
decoration: BoxDecoration(
gradient: connected
? LinearGradient(colors: [Colors.green.shade600, Colors.green.shade400])
: const LinearGradient(colors: [Colors.white, Colors.white]),
borderRadius: BorderRadius.circular(20),
boxShadow: [
BoxShadow(
color: Colors.black.withValues(alpha: 0.05),
blurRadius: 10,
),
],
),
child: Column(
children: [
Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Text(
connected ? "Connected" : "Disconnected",
style: TextStyle(fontSize: 18,
fontWeight: FontWeight.bold,
color: connected ? Colors.white : Colors.black87,
),
),
Icon(
connected ? Icons.check_circle : Icons.error_outline,
color: connected ? Colors.white : Colors.redAccent,
),
],
),
const SizedBox(height: 20),
Row(
children: [
Expanded(
child: _buildButton(
label: "Connect",
icon: Icons.link,
color: connected
? Colors.white.withValues(alpha: 0.2)
: Colors.blue,
textColor: connected ? Colors.white : Colors.white,
onPressed: connected
? null
: () {
if (_selected == null) {
PremiumToast.show(context, "Select a printer first", BTStatus.error);
return;
}
bt.connect(_selected!.address);
},
),
),
const SizedBox(width: 12),
Expanded(
child: _buildButton(
label: "Disconnect",
icon: Icons.link_off,
color: connected ? Colors.white.withValues(alpha: 0.3) : Colors.grey.shade200,
textColor: connected ? Colors.white : Colors.black54,
onPressed: connected ? bt.disconnect : null,
),
),
],
),
],
),
);
},
);
}
Widget _buildPrintActionCard() {
return StreamBuilder<bool>(
stream: bt.isConnected$,
builder: (context, snapshot) {
final connected = snapshot.data ?? false;
return Card(
elevation: 0,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(20),
),
child: Padding(
padding: const EdgeInsets.all(20),
child: Column(
children: [
const Text("Ready to print receipts and labels using thermal technology.",
textAlign: TextAlign.center,
style: TextStyle(color: Colors.grey),
),
const SizedBox(height: 20),
SizedBox(
width: double.infinity,
height: 55,
child: ElevatedButton.icon(
style: ElevatedButton.styleFrom(
backgroundColor: connected ? Colors.black87 : Colors.grey.shade300,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(15),
),
),
/// BYTES PRINT FOR TEST PURPOSE
onPressed: connected ? () => bt.selectPdfAndPrint() : null,
/// TEXT PRINT FOR TEST PURPOSE
// onPressed: connected ? () => printText() : null,
icon: const Icon(Icons.print, color: Colors.white),
label: const Text("PRINT TEST RECEIPT",
style: TextStyle(color: Colors.white, fontWeight: FontWeight.bold),
),
),
),
],
),
),
);
},
);
}
Widget _buildButton({
required String label, required IconData icon,
required Color color, required Color textColor, VoidCallback? onPressed }) {
return SizedBox(
height: 50,
child: TextButton.icon(
style: TextButton.styleFrom(
backgroundColor: color,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(12),
),
),
onPressed: onPressed,
icon: Icon(icon, color: textColor, size: 20),
label: Text(
label,
style: TextStyle(color: textColor, fontWeight: FontWeight.bold),
),
),
);
}
}
class PremiumToast {
static void show(BuildContext context, String message, BTStatus status) {
Color bgColor;
IconData icon;
switch (status) {
case BTStatus.connected:
bgColor = const Color(0xFF2E7D32);
icon = Icons.check_circle_outline;
break;
case BTStatus.disconnected:
bgColor = const Color(0xFFC62828);
icon = Icons.link_off;
break;
case BTStatus.connecting:
bgColor = const Color(0xFF1565C0);
icon = Icons.sync;
break;
case BTStatus.error:
bgColor = Colors.orange.shade900;
icon = Icons.warning_amber_rounded;
break;
default:
bgColor = Colors.black87;
icon = Icons.info_outline;
}
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
elevation: 0,
behavior: SnackBarBehavior.floating,
backgroundColor: Colors.transparent,
content: Container(
padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
decoration: BoxDecoration(
color: bgColor,
borderRadius: BorderRadius.circular(20),
boxShadow: [
BoxShadow(
color: bgColor.withValues(alpha: 0.4),
blurRadius: 12,
offset: const Offset(0, 4),
),
],
),
child: Row(
children: [
Icon(icon, color: Colors.white, size: 28),
const SizedBox(width: 12),
Expanded(
child: Text(
message,
style: const TextStyle(
color: Colors.white,
fontWeight: FontWeight.w600,
fontSize: 15,
),
),
),
],
),
),
duration: const Duration(seconds: 3),
),
);
}
}Metadata
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Metadata
Bluetooth thermal printing plugin for Flutter supporting ESC/POS printers, image and PDF printing.
Repository (GitHub)
View/report issues
Documentation
License
MIT (license)
Dependencies
flutter, pdf, plugin_platform_interface, printing
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