feat: connect to ESense via AlertDialog

android/app/src/main/AndroidManifest.xml

@@ -1,4 +1,17 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The following permission is related to the eSense library -->
+    <uses-permission
+        android:name="android.permission.BLUETOOTH"
+        android:maxSdkVersion="30" />
+    <uses-permission
+        android:name="android.permission.BLUETOOTH_ADMIN"
+        android:maxSdkVersion="30" />
+    <uses-permission
+        android:name="android.permission.BLUETOOTH_SCAN" 
+        android:usesPermissionFlags="neverForLocation" /> 
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT"/>
+    <uses-feature android:name="android.hardware.bluetooth_le" android:required="true" />
+
     <application
         android:label="sense_the_rhythm"
         android:name="${applicationName}"

lib/level_selection.dart

@@ -1,7 +1,9 @@
 import 'dart:io';
 
+import 'package:esense_flutter/esense.dart';
 import 'package:file_picker/file_picker.dart';
 import 'package:flutter/material.dart';
+import 'package:permission_handler/permission_handler.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
 import 'level.dart';
@@ -17,12 +19,85 @@ class _LevelSelectionState extends State<LevelSelection> {
   String? stepmaniaCoursesPath;
   List<FileSystemEntity> stepmaniaCoursesFolders = [];
 
+  ESenseManager? eSenseManager;
+  String _deviceStatus = '';
+  String eSenseDeviceName = '';
+  bool connected = false;
+  bool sampling = false;
+
   @override
   void initState() {
     super.initState();
     loadFolderPath();
   }
 
+  Future<void> _askForPermissions() async {
+    if (!(await Permission.bluetoothScan.request().isGranted &&
+        await Permission.bluetoothConnect.request().isGranted)) {
+      print(
+          'WARNING - no permission to use Bluetooth granted. Cannot access eSense device.');
+    }
+    // for some strange reason, Android requires permission to location for Bluetooth to work.....?
+    if (Platform.isAndroid) {
+      if (!(await Permission.locationWhenInUse.request().isGranted)) {
+        print(
+            'WARNING - no permission to access location granted. Cannot access eSense device.');
+      }
+    }
+  }
+
+  Future<void> _listenToESense() async {
+    await _askForPermissions();
+
+    // if you want to get the connection events when connecting,
+    // set up the listener BEFORE connecting...
+    eSenseManager!.connectionEvents.listen((event) {
+      print('CONNECTION event: $event');
+
+      // when we're connected to the eSense device, we can start listening to events from it
+      // if (event.type == ConnectionType.connected) _listenToESenseEvents();
+
+      setState(() {
+        connected = false;
+        switch (event.type) {
+          case ConnectionType.connected:
+            _deviceStatus = 'connected';
+            connected = true;
+            break;
+          case ConnectionType.unknown:
+            _deviceStatus = 'unknown';
+            break;
+          case ConnectionType.disconnected:
+            _deviceStatus = 'disconnected';
+            sampling = false;
+            break;
+          case ConnectionType.device_found:
+            _deviceStatus = 'device_found';
+            break;
+          case ConnectionType.device_not_found:
+            _deviceStatus = 'device_not_found';
+            break;
+        }
+      });
+    });
+  }
+
+  Future<void> _connectToESense() async {
+    if (!connected) {
+      await _askForPermissions();
+      print('Trying to connect to eSense device...');
+      print(eSenseDeviceName);
+      eSenseManager = ESenseManager(eSenseDeviceName);
+      connected = await eSenseManager!.connect();
+      print('success!');
+
+      setState(() {
+        _deviceStatus = connected ? 'connecting...' : 'connection failed';
+      });
+      _listenToESense();
+    }
+  }
+
   Future<void> loadFolderPath() async {
     SharedPreferences prefs = await SharedPreferences.getInstance();
     final String? stepmaniaCoursesPathSetting =
@@ -68,7 +143,52 @@ class _LevelSelectionState extends State<LevelSelection> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(title: const Text('Sense the Rhythm')),
+      appBar: AppBar(
+        title: const Text('Sense the Rhythm'),
+        actions: [
+          IconButton(
+              onPressed: () => showDialog<String>(
+                    context: context,
+                    builder: (BuildContext context) {
+                      return AlertDialog(
+                        title: const Text('Connect to ESense'),
+                        content: StatefulBuilder(builder:
+                            (BuildContext context, StateSetter setState) {
+                          return Column(
+                              mainAxisSize: MainAxisSize.min,
+                              children: [
+                                TextField(
+                                  onChanged: (input) {
+                                    setState(() {
+                                      eSenseDeviceName = input;
+                                    });
+                                  },
+                                  decoration: InputDecoration(
+                                    border: OutlineInputBorder(),
+                                    hintText: 'eSense-xxxx',
+                                    labelText: 'Device name',
+                                  ),
+                                ),
+                                Text(eSenseDeviceName),
+                                Text(_deviceStatus)
+                              ]);
+                        }),
+                        actions: <Widget>[
+                          TextButton(
+                            onPressed: () => Navigator.pop(context, 'Cancel'),
+                            child: const Text('Discard'),
+                          ),
+                          TextButton(
+                            onPressed: () => _connectToESense(),
+                            child: const Text('Connect'),
+                          ),
+                        ],
+                      );
+                    },
+                  ),
+              icon: const Icon(Icons.bluetooth))
+        ],
+      ),
       body: Builder(builder: (context) {
         if (stepmaniaCoursesPath == null) {
           return Text('Add a Directory with Stepmania Songs on \'+\'');

pubspec.lock

@@ -121,6 +121,15 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.0.8"
+  esense_flutter:
+    dependency: "direct main"
+    description:
+      path: "packages/esense_flutter"
+      ref: master
+      resolved-ref: "3784963fcdeaebc4e81679dc331e3f195ecd1c42"
+      url: "https://github.com/cph-cachet/flutter-plugins.git"
+    source: git
+    version: "1.0.0"
   fake_async:
     dependency: transitive
     description:
@@ -320,6 +329,54 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.3.0"
+  permission_handler:
+    dependency: "direct main"
+    description:
+      name: permission_handler
+      sha256: "18bf33f7fefbd812f37e72091a15575e72d5318854877e0e4035a24ac1113ecb"
+      url: "https://pub.dev"
+    source: hosted
+    version: "11.3.1"
+  permission_handler_android:
+    dependency: transitive
+    description:
+      name: permission_handler_android
+      sha256: "71bbecfee799e65aff7c744761a57e817e73b738fedf62ab7afd5593da21f9f1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "12.0.13"
+  permission_handler_apple:
+    dependency: transitive
+    description:
+      name: permission_handler_apple
+      sha256: e6f6d73b12438ef13e648c4ae56bd106ec60d17e90a59c4545db6781229082a0
+      url: "https://pub.dev"
+    source: hosted
+    version: "9.4.5"
+  permission_handler_html:
+    dependency: transitive
+    description:
+      name: permission_handler_html
+      sha256: "38f000e83355abb3392140f6bc3030660cfaef189e1f87824facb76300b4ff24"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.1.3+5"
+  permission_handler_platform_interface:
+    dependency: transitive
+    description:
+      name: permission_handler_platform_interface
+      sha256: e9c8eadee926c4532d0305dff94b85bf961f16759c3af791486613152af4b4f9
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.2.3"
+  permission_handler_windows:
+    dependency: transitive
+    description:
+      name: permission_handler_windows
+      sha256: "1a790728016f79a41216d88672dbc5df30e686e811ad4e698bfc51f76ad91f1e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.2.1"
   platform:
     dependency: transitive
     description:

pubspec.yaml

@@ -14,6 +14,12 @@ dependencies:
   shared_preferences: ^2.3.4
   file_picker: ^8.1.6
   audioplayers: ^6.1.0
+  esense_flutter: 
+    git:
+      url: https://github.com/cph-cachet/flutter-plugins.git
+      ref: master
+      path: packages/esense_flutter/
+  permission_handler: ^11.3.1
 
 dev_dependencies:
   flutter_test: