ble_provider 0.0.5

This package provides Flutter access to Polestar indoor location provider.

example/lib/main.dart

import 'package:flutter/material.dart';
import 'dart:async';

import 'package:flutter/services.dart';
import 'package:ble_provider/ble_provider.dart';
import 'package:ble_provider/indoor_location.dart';
import 'package:flutter_dotenv/flutter_dotenv.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  bool _providerStarted = false;
  List<IndoorLocation> _locations = List();

  @override
  void initState() {
    super.initState();
    initPlatformState();
    dotenv.load();
  }

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> initPlatformState() async {
    String platformVersion;
    // Platform messages may fail, so we use a try/catch PlatformException.
    try {
      platformVersion = await BleProvider.platformVersion;
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';
    }

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

    setState(() {
      _platformVersion = platformVersion;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('ble_provider example app'),
        ),
        body: Container(
          margin: EdgeInsets.only(top: 20),
          child: Column (
            mainAxisAlignment: MainAxisAlignment.start,
            children: [
              Text('Running on: $_platformVersion\n'
                  'Provider started: $_providerStarted'),
              Container (
                margin: EdgeInsets.only(top: 20),
                height: 100,
                child: GridView.count(
                  crossAxisCount: 4,
                  childAspectRatio: 1.0,
                  padding: const EdgeInsets.all(4.0),
                  mainAxisSpacing: 4.0,
                  crossAxisSpacing: 4.0,
                  children: [
                    MaterialButton(
                      child: Text("Initialize provider"),
                      onPressed: () async {
                        await BleProvider.init(dotenv.env["POLESTAR_KEY"]);
                        print("init ok");
                      },
                      color: Colors.lightBlue,
                      textColor: Colors.white,
                    ),
                    MaterialButton(
                      child: Text("Add location listener"),
                      onPressed: () async {
                        bool result = await BleProvider.setLocationCallback(
                            (IndoorLocation location) {
                              setState(() {
                                _locations.insert(0, location);
                              });
                            }
                        );
                        print("location listener added: $result");
                      },
                      color: Colors.lightBlue,
                      textColor: Colors.white,
                    ),
                    MaterialButton(
                      child: Text("Start provider"),
                      onPressed: () async {
                        bool started = await BleProvider.start();
                        setState(() {
                          _providerStarted = started;
                        });
                      },
                      color: Colors.lightBlue,
                      textColor: Colors.white,
                    ),
                    MaterialButton(
                      child: Text("Stop provider"),
                      onPressed: () async {
                        if (await BleProvider.stop())
                          setState(() {
                            _providerStarted = false;
                          });
                      },
                      color: Colors.lightBlue,
                      textColor: Colors.white,
                    )
                  ],
                ),
              ),
              Expanded(
                child: _locations.length == 0 ?
                    Container (
                      margin: EdgeInsets.all(10),
                      child: Center(
                        child: Text("Received locations will appear here.\n(you need to "
                            "activate both Bluetooth and location on your phone)",
                          textAlign: TextAlign.center,
                        ),
                      ),
                    ) :
                    ListView (
                      children: _locations.map((e) => ListTile(
                        title: Text("${e.latitude}, ${e.longitude}"),
                        subtitle: Text("Received at ${e.receivedTime}\nAccuracy: ${e.accuracy} | Floor: ${e.floor}"),
                        isThreeLine: true,
                      )).toList(),
                    )
              )
            ],
          ),
        ),
      ),
    );
  }
}