Merge branch 'ui-final-layout' into 'master'

UI Advances

See merge request !3

.flutter-plugins-dependencies

-{"info":"This is a generated file; do not edit or check into version control.","plugins":{"ios":[{"name":"flutter_blue","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\flutter_blue-0.7.2\\\\","dependencies":[]},{"name":"geolocator","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\geolocator-5.2.1\\\\","dependencies":["google_api_availability","location_permissions"]},{"name":"google_api_availability","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\google_api_availability-2.0.2\\\\","dependencies":[]},{"name":"location_permissions","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\location_permissions-2.0.4+1\\\\","dependencies":[]},{"name":"path_provider","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\path_provider-1.6.0\\\\","dependencies":[]},{"name":"permission_handler","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\permission_handler-4.2.0+hotfix.3\\\\","dependencies":[]},{"name":"shared_preferences","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\shared_preferences-0.5.7+2\\\\","dependencies":[]},{"name":"sqflite","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\sqflite-1.2.0\\\\","dependencies":[]}],"android":[{"name":"flutter_blue","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\flutter_blue-0.7.2\\\\","dependencies":[]},{"name":"geolocator","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\geolocator-5.2.1\\\\","dependencies":["google_api_availability","location_permissions"]},{"name":"google_api_availability","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\google_api_availability-2.0.2\\\\","dependencies":[]},{"name":"location_permissions","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\location_permissions-2.0.4+1\\\\","dependencies":[]},{"name":"path_provider","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\path_provider-1.6.0\\\\","dependencies":[]},{"name":"permission_handler","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\permission_handler-4.2.0+hotfix.3\\\\","dependencies":[]},{"name":"shared_preferences","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\shared_preferences-0.5.7+2\\\\","dependencies":[]},{"name":"sqflite","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\sqflite-1.2.0\\\\","dependencies":[]}],"macos":[{"name":"shared_preferences_macos","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\shared_preferences_macos-0.0.1+8\\\\","dependencies":[]},{"name":"sqflite","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\sqflite-1.2.0\\\\","dependencies":[]}],"linux":[],"windows":[],"web":[{"name":"shared_preferences_web","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\shared_preferences_web-0.1.2+5\\\\","dependencies":[]}]},"dependencyGraph":[{"name":"flutter_blue","dependencies":[]},{"name":"geolocator","dependencies":["google_api_availability","location_permissions"]},{"name":"google_api_availability","dependencies":[]},{"name":"location_permissions","dependencies":[]},{"name":"path_provider","dependencies":[]},{"name":"permission_handler","dependencies":[]},{"name":"shared_preferences","dependencies":["shared_preferences_macos","shared_preferences_web"]},{"name":"shared_preferences_macos","dependencies":[]},{"name":"shared_preferences_web","dependencies":[]},{"name":"sqflite","dependencies":[]}],"date_created":"2020-05-15 10:37:30.582661","version":"1.19.0-2.0.pre.71"}
\ No newline at end of file
+{"info":"This is a generated file; do not edit or check into version control.","plugins":{"ios":[{"name":"flutter_blue","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\flutter_blue-0.7.2\\\\","dependencies":[]},{"name":"geolocator","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\geolocator-5.2.1\\\\","dependencies":["google_api_availability","location_permissions"]},{"name":"google_api_availability","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\google_api_availability-2.0.2\\\\","dependencies":[]},{"name":"location_permissions","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\location_permissions-2.0.4+1\\\\","dependencies":[]},{"name":"path_provider","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\path_provider-1.6.0\\\\","dependencies":[]},{"name":"permission_handler","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\permission_handler-4.2.0+hotfix.3\\\\","dependencies":[]},{"name":"shared_preferences","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\shared_preferences-0.5.7+2\\\\","dependencies":[]},{"name":"sqflite","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\sqflite-1.2.0\\\\","dependencies":[]}],"android":[{"name":"flutter_blue","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\flutter_blue-0.7.2\\\\","dependencies":[]},{"name":"geolocator","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\geolocator-5.2.1\\\\","dependencies":["google_api_availability","location_permissions"]},{"name":"google_api_availability","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\google_api_availability-2.0.2\\\\","dependencies":[]},{"name":"location_permissions","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\location_permissions-2.0.4+1\\\\","dependencies":[]},{"name":"path_provider","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\path_provider-1.6.0\\\\","dependencies":[]},{"name":"permission_handler","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\permission_handler-4.2.0+hotfix.3\\\\","dependencies":[]},{"name":"shared_preferences","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\shared_preferences-0.5.7+2\\\\","dependencies":[]},{"name":"sqflite","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\sqflite-1.2.0\\\\","dependencies":[]}],"macos":[{"name":"shared_preferences_macos","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\shared_preferences_macos-0.0.1+8\\\\","dependencies":[]},{"name":"sqflite","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\sqflite-1.2.0\\\\","dependencies":[]}],"linux":[],"windows":[],"web":[{"name":"shared_preferences_web","path":"C:\\\\src\\\\flutter\\\\.pub-cache\\\\hosted\\\\pub.dartlang.org\\\\shared_preferences_web-0.1.2+5\\\\","dependencies":[]}]},"dependencyGraph":[{"name":"flutter_blue","dependencies":[]},{"name":"geolocator","dependencies":["google_api_availability","location_permissions"]},{"name":"google_api_availability","dependencies":[]},{"name":"location_permissions","dependencies":[]},{"name":"path_provider","dependencies":[]},{"name":"permission_handler","dependencies":[]},{"name":"shared_preferences","dependencies":["shared_preferences_macos","shared_preferences_web"]},{"name":"shared_preferences_macos","dependencies":[]},{"name":"shared_preferences_web","dependencies":[]},{"name":"sqflite","dependencies":[]}],"date_created":"2020-07-13 03:41:01.914636","version":"1.19.0-2.0.pre.49"}
\ No newline at end of file

CHANGELOG.md

@@ -46,6 +46,10 @@ Integrated Geolocation to the app and visualization on the app.
 
 ### [0.0.6] Added
 
+- (UI) Map
+- (UI) Settings
+- ()
+
 ### [0.0.6] Changed
 
 - `BTLEHandler`

lib/logic/data_header.dart

@@ -29,8 +29,20 @@ class DataHeader {
   /// @Getter for _headerSet;
   bool get headerSet => this._headerSet;
 
+  Stream<bool> getWhenHeaderSet() async* {
+    while (true) {
+      yield this._headerSet;
+      await Future.delayed(Duration(seconds: 1));
+    }
+  }
+
   bool isEqual(List<int> that) => ListEquality().equals(_headerData, that);
 
   // TODO
   Map<String, dynamic> jsonify() => { 'device_id' : this._headerData[0], 'url': '000000000000' };
+
+  void dispose() {
+    this._headerSet = false;
+    this._headerData = []; 
+  }
 }
\ No newline at end of file

lib/logic/data_packet.dart

@@ -6,6 +6,7 @@ import 'package:logair_application/utils/utils.dart';
 /// and contains methods for: 
 ///   quick lookup, 
 ///   conversion to POST format,
+// TODO Firmware@v2 : Extra data
 class DataPacket {
   List<int> _data;
   int _timestamp;
@@ -14,7 +15,7 @@ class DataPacket {
   double _latitude;
   double _longitude;
   int _altitude;
-  double _heading;
+  int _heading;
   double _speed;
 
   /* Ambient metrics */
@@ -28,11 +29,14 @@ class DataPacket {
   double _pm4;
   double _pm10;
 
+  // TODO Firmware v2
+  String _extraData;
+
   int timestamp() => _timestamp;
   double latitude() => _latitude;
   double longitude() => _longitude;
   int altitude() => _altitude;
-  double heading() => _heading;
+  int heading() => _heading;
   double speed() => _speed;
   double temperature() => _temperature;
   double pressure() => _pressure;
@@ -48,7 +52,7 @@ class DataPacket {
     this._latitude = (acquiredData[0] != '') ? parseDoubleWrapper(acquiredData[0]) : null;
     this._longitude = (acquiredData[1] != '') ? parseDoubleWrapper(acquiredData[1]) : null;
     this._altitude = (acquiredData[2] != '') ? int.tryParse(acquiredData[2]) : null;
-    this._heading = (acquiredData[3] != '') ? parseDoubleWrapper(acquiredData[3]) : null;
+    this._heading = (acquiredData[3] != '') ? int.tryParse(acquiredData[3]) : null;
     this._speed = (acquiredData[4] != '') ? parseDoubleWrapper(acquiredData[4]) : null;
 
     this._temperature = (acquiredData[5] != '') ? parseDoubleWrapper(acquiredData[5]) : null;
@@ -66,11 +70,30 @@ class DataPacket {
         this._latitude = position.latitude;
         this._longitude = position.longitude;
         this._altitude = position.altitude.toInt();
-        this._heading = position.heading;
+        this._heading = position.heading.round() % 360;
         this._speed = position.speed;
       }
     }
+  }
+  
+  DataPacket.fromData(this._timestamp, this._latitude, this._longitude, this._altitude, this._speed, this._heading, this._temperature, this._pressure, this._relativeHumidity, this._pm1, this._pm2_5, this._pm4, this._pm10, this._extraData);
 
+  // TODO Guard clause
+  DataPacket.fromMappedData(Map<String, dynamic> data) {
+    this._timestamp = data['timestamp_nix'];
+    this._latitude = data['latitude'];
+    this._longitude = data['longitude'];
+    this._altitude = data['altitude'];
+    this._speed = data['speed'];
+    this._heading = data['heading'];
+    this._temperature = data['temperature'];
+    this._relativeHumidity = data['relative_humidity'];
+    this._pressure = data['pressure'];
+    this._pm1 = data['pm_1'];
+    this._pm2_5 = data['pm_2_5'];
+    this._pm4 = data['pm_4'];
+    this._pm10 = data['pm_10'];
+    this._extraData = data['extra'];
   }
 
   String stringify() => '${this._latitude}, ${this._longitude}, ${this._temperature}, ${this._pressure}, ${this._relativeHumidity}, ${this._pm2_5}, ${this._pm10}';
@@ -90,4 +113,28 @@ class DataPacket {
     this._pm4,
     this._pm10
   ];
+
+  Map<String, dynamic> toMap() {
+    return {
+      'timestamp_nix': this._timestamp,
+      'latitude': this._latitude,
+      'longitude': this._longitude,
+      'altitude': this._altitude,
+      'speed': this._speed,
+      'heading': this._heading,
+      'temperature': this._temperature,
+      'relative_humidity': this._temperature,
+      'pressure': this._pressure,
+      'pm_1': this._pm1,
+      'pm_2_5': this._pm2_5,
+      'pm_4': this._pm4,
+      'pm_10': this._pm10,
+      'extra': ''
+    };
+  }
+
+  @override
+  String toString() {
+    return 'DataPacket{time: $_timestamp, lat: $_latitude, long: $_longitude, pm1: $_pm1, pm2.5: $_pm2_5, pm4: $_pm4, pm10: $_pm10}';
+  }
 }
\ No newline at end of file

lib/logic/handlers/bluetooth_le_handler.dart

@@ -80,7 +80,7 @@ class BTLEHandler {
     _characteristic = null;
     _device = null;
     _bluetoothConnectionStatus = BluetoothConnectionStatus.BTSTATUS_NOT_STREAMING;
-
+    DataHandler().dispose();
     return it.disconnect();
   });
 

lib/logic/handlers/data_handler.dart

 import 'package:logair_application/logic/handlers/bluetooth_le_handler.dart';
 import 'package:logair_application/logic/data_header.dart';
 import 'package:logair_application/logic/data_packet.dart';
+import 'package:logair_application/logic/handlers/database_handler.dart';
 
 class DataHandler {
   factory DataHandler() => _singleton;
@@ -8,7 +9,7 @@ class DataHandler {
   DataHandler._internal();
   static const HEADER_SIZE = 11;
 
-  static final DataHandler _singleton = new DataHandler._internal();
+  static final DataHandler _singleton = new DataHandler._internal();  
 
   /// [List] containing all of the data received by this.
   List<int> _data = [];
@@ -49,11 +50,18 @@ class DataHandler {
     /// If it's a [DataHeader] instance.
     if (packet[0] == 123) {
       print('HEADER ${String.fromCharCodes(packet)}');
+      bool wasSet = DataHeader().headerSet;
       DataHeader().setHeader(packet);
+      /// Retroactively add all previous packets
+      if (!wasSet && DataHeader().headerSet)
+        _sortedData.forEach((packet) => DatabaseHandler().insertData(packet, DataHeader().deviceID));
+      
     /// Or if it is a [DataPacket] instance.
     } else if (packet[0] == 91) {
       _sortedData.add(DataPacket(packet));
       print('PACKET ${String.fromCharCodes(packet)}');
+      if (DataHeader().headerSet)
+        DatabaseHandler().insertData(_sortedData.last, DataHeader().deviceID);
     }
   }
   /// TODO Used for debugging, later
@@ -89,11 +97,13 @@ class DataHandler {
     }
   }
 
+  @deprecated
   /// Used to monitor the amount of unsent [DataPacket]s.
   Stream<int> getUnsentPacketsLength() async* {
-    while (true) {
-      yield (_sortedData.length);
-      await Future.delayed(Duration(seconds: 1));
-    }
+  }
+
+  void dispose() {
+    DataHeader().dispose();
+    this._data.removeWhere((element) => true);
   }
 }
\ No newline at end of file

lib/logic/handlers/database_handler.dart

+
+import 'package:logair_application/logic/data_header.dart';
+import 'package:logair_application/logic/data_packet.dart';
+import 'package:path/path.dart';
+import 'package:sqflite/sqflite.dart';
+import 'package:tuple/tuple.dart';
+
+class DatabaseHandler {
+  factory DatabaseHandler() => _singleton;
+
+  Future<Database> _db;
+
+  bool shouldCache;
+
+  Future<Database> get _database async {
+    if (_db == null) 
+      this._db = openDatabase(
+        join((await getDatabasesPath()), 'logair_data.db'),
+        version: 1,
+        onCreate: (db, version) => db.execute('''CREATE TABLE data(
+          id INTEGER PRIMARY KEY AUTOINCREMENT,
+          device_id TEXT,
+          timestamp_nix INTEGER,
+          latitude REAL,
+          longitude REAL,
+          altitude INTEGER, 
+          speed REAL,
+          heading INTEGER,
+          temperature FLOAT,
+          relative_humidity FLOAT,
+          pressure FLOAT,
+          pm_1 FLOAT,
+          pm_2_5 FLOAT,
+          pm_4 FLOAT,
+          pm_10 FLOAT,
+          extra TEXT,
+          exported TINYINT DEFAULT 0
+        )''')
+      );
+    return this._db;
+  }
+
+  // TODO REMOVE !
+  Future<void> recreateDB() async {
+    final Database database = await _database;
+
+    await database.rawQuery('DROP TABLE IF EXISTS data');
+    await database.rawQuery('''CREATE TABLE data(
+          id INTEGER PRIMARY KEY AUTOINCREMENT,
+          device_id TEXT,
+          timestamp_nix INTEGER,
+          latitude REAL,
+          longitude REAL,
+          altitude INTEGER, 
+          speed REAL,
+          heading INTEGER,
+          temperature FLOAT,
+          relative_humidity FLOAT,
+          pressure FLOAT,
+          pm_1 FLOAT,
+          pm_2_5 FLOAT,
+          pm_4 FLOAT,
+          pm_10 FLOAT,
+          extra TEXT,
+          exported TINYINT DEFAULT 0
+        )''');
+  }
+
+  DatabaseHandler._internal();
+
+  static final DatabaseHandler _singleton = new DatabaseHandler._internal();
+
+  Future<void> insertData(DataPacket packet, String deviceId) async {
+    final Database database = await _database;
+    Map<String, dynamic> insert = packet.toMap();
+    insert['device_id'] = deviceId;
+    await database.insert(
+      'data',
+      insert,
+      conflictAlgorithm: ConflictAlgorithm.replace
+    );
+  }
+
+  Future<List<DataPacket>> get data async {
+    final Database database = await _database;
+
+    final List<Map<String, dynamic>> data = await database.query('data');
+
+    return List.generate(data.length, (i) => DataPacket.fromMappedData(data[i]));
+  }
+
+  Future<int> deleteAll() async => await (await this._database).delete('data');
+
+  Future<void> close() async => (await this._database).close();
+
+  Stream<int> getDBSize() async* {
+    final Database database = await _database;
+    while (true) {
+      final List<Map<String, dynamic>> data = await database.rawQuery('SELECT COUNT(*) AS count FROM data');
+      yield data[0]['count'] ?? 0;
+      await Future.delayed(Duration(seconds: 5));
+    }
+  }
+
+  Future<List<Tuple2<int, DataPacket>>> getUnsent(int limit) async {
+    final Database database = await _database;
+    final List<Map<String, dynamic>> data = await database.query('data', 
+      where: 'exported = ?',
+      whereArgs: [0],
+      limit: limit,
+      orderBy: 'timestamp_nix ASC'
+    );
+
+    print(data);
+    
+    return List.generate(data.length, (i) => Tuple2(data[i]['id'], DataPacket.fromMappedData(data[i])));
+  }
+
+  Future<void> setExported(List<int> ids) async {
+    final Database database = await _database;
+    print('UPDATE data SET exported = 1 WHERE id IN (${ids.join(', ')})');
+    int count = await database.rawUpdate('UPDATE data SET exported = 1 WHERE id IN (${ids.join(', ')})');
+    print('Exported $count');
+  }
+
+  /// Used to monitor the amount of unsent [DataPacket]s.
+  Stream<int> getUnsentPacketsLength() async* {
+    final Database database = await _database;
+    while (true) {
+      final List<Map<String, dynamic>> data = await database.rawQuery('SELECT COUNT(*) AS count FROM data WHERE exported = 0');
+      yield data[0]['count'] ?? 0;
+      await Future.delayed(Duration(seconds: 1));
+    }
+  }
+
+  Stream<Map<String, dynamic>> getLatest() async* {
+    final Database database = await _database;
+    while (true) {
+      final List<Map<String, dynamic>> data = await database.rawQuery('SELECT MIN(timestamp_nix) AS start, AVG(pm_1) AS pm_1, AVG(pm_2_5) AS pm_2_5, AVG(pm_4) AS pm_4, AVG(pm_10) AS pm_10 FROM (SELECT * FROM data ORDER BY id DESC LIMIT 5)');
+      yield data[0] ?? Map();
+      await Future.delayed(Duration(seconds: 5));
+    }
+  }
+}
\ No newline at end of file

lib/logic/handlers/network_handler.dart

@@ -3,13 +3,13 @@ import 'dart:convert';
 import 'dart:collection';
 
 import 'package:flutter_map/flutter_map.dart';
-import 'package:geolocator/geolocator.dart';
 import 'package:http/http.dart' as http;
-import 'package:latlong/latlong.dart';
 
 import 'package:logair_application/logic/data_header.dart';
 import 'package:logair_application/logic/data_packet.dart';
 import 'package:logair_application/logic/handlers/data_handler.dart';
+import 'package:logair_application/logic/handlers/database_handler.dart';
+import 'package:tuple/tuple.dart';
 
 /// Singleton data structure that contains services enabling the application to send data to a webserver.
 /// TODO Make URL user configurable.
@@ -17,6 +17,7 @@ class NetworkHandler {
   factory NetworkHandler() => _singleton;
 
   NetworkHandler._internal() {
+    // TODO Preferences
     /// Define the interval between attempts to send the data to the server. (default: 1 minute).
     const duration = const Duration(minutes: 1);
     new Timer.periodic(duration, (Timer t) => this._sendDataToServer());
@@ -28,6 +29,7 @@ class NetworkHandler {
 
   /// Method to send acquired data packets by using a POST requests.
   void _sendDataToServer() async {
+    // TODO Preferences
     /// The default endpoint.
     String url = 'https://api.logair.unige.ch/v1/service';
     
@@ -38,8 +40,10 @@ class NetworkHandler {
     /// Get the map representation of a [DataHeader].
     Map<String, dynamic> headerData = DataHeader().jsonify();
 
+    List<Tuple2<int, DataPacket>> databaseData = await DatabaseHandler().getUnsent(100);
+    
     /// Get all the [DataPacket]s to be sent (maximum 100).
-    List<DataPacket> packets = DataHandler().getDataRange(100);
+    List<DataPacket> packets = databaseData.map((x) => x.item2).toList();
 
     /// Convert the [DataPacket] list to a [Map] of their [List] representations.
     Map<String, List<List<dynamic>>> packetList = { 
@@ -64,7 +68,8 @@ class NetworkHandler {
     if (response != null && response.statusCode == 200) {
       for (int i = 0; i < packets.length; i++) {
         DataHandler().pop();
-      } 
+      }
+      await DatabaseHandler().setExported(databaseData.map((x) => x.item1).toList());
       print('RESPONSE ${response.statusCode}');
       this._lastServerTransmission = DateTime.now();
     }

lib/logic/handlers/preference_handler.dart

 import 'package:shared_preferences/shared_preferences.dart';
+import 'package:tuple/tuple.dart';
 
 /// Handler enabling the storage and use of preferences.
 class PreferencesHandler {
+  Map<String, Tuple2<dynamic, dynamic>> _defaultValues = {
+    'BT.USING_ADVANCED': Tuple2(bool, false),
+    'BT.FREQUENT': Tuple2(String, '[ ]'),
+    'BT.SERVICE_UUID': Tuple2(String, '0000ffe0-0000-1000-8000-00805f9b34fb'),
+    'BT.CHARACTERISTIC_UUID': Tuple2(String, '0000ffe1-0000-1000-8000-00805f9b34fb'),
+    'MAP.USING_ADVANCED': Tuple2(bool, false),
+    'MAP.PROX.MAX_PER_QUERY': Tuple2(int, 200),
+    'MAP.PROX.MAX_AGE_SECONDS': Tuple2(int, 200)
+  };
+
   static final PreferencesHandler _singleton = new PreferencesHandler._internal();
 
-  SharedPreferences _sharedPreferences;
+  SharedPreferences _sharedPreferencesInternal;
 
-  PreferencesHandler._internal() {
-    SharedPreferences.getInstance().then((SharedPreferences prefs) {
-      this._sharedPreferences = prefs;
+  Future<SharedPreferences> get _sharedPreferences async {
+    if (_sharedPreferencesInternal == null) {
+      this._sharedPreferencesInternal = await SharedPreferences.getInstance();
       /// Initial Setup
-      if (!prefs.containsKey('BT.USING_ADVANCED')) prefs.setBool('BT.USING_ADVANCED', false);
-      if (!prefs.containsKey('BT.USING_ADVANCED_DEFAULT')) prefs.setBool('BT.USING_ADVANCED_DEFAULT', false);
-
-      if (!prefs.containsKey('BT.FREQUENT')) prefs.setString('BT.FREQUENT', '[ ]');
-      if (!prefs.containsKey('BT.FREQUENT_DEFAULT')) prefs.setString('BT.FREQUENT_DEFAULT', '[ ]');
+      _defaultValues.forEach((key, value) {
+        Function setter;
+        switch (value.item1) {
+          case int:
+            setter = this._sharedPreferencesInternal.setInt;
+            break;
+          case bool:
+            setter = this._sharedPreferencesInternal.setBool;
+            break;
+          case String:
+            setter = this._sharedPreferencesInternal.setString;
+            break;
+          default:
+            throw ArgumentError('Unexpected property type');
+        }
+        if (!this._sharedPreferencesInternal.containsKey(key)) {
+          setter(key, value.item2);
+          setter(key + '_DEFAULT', value.item2);
+        }
+       });
+      print('Setup preferences \n ${List.generate(this._sharedPreferencesInternal.getKeys().length, (i) => this._sharedPreferencesInternal.getKeys().elementAt(i) + ' => ' + this._sharedPreferencesInternal.get(this._sharedPreferencesInternal.getKeys().elementAt(i)).toString()).join("\n")}');
+    }
 
-      if (!prefs.containsKey('BT.SERVICE_UUID')) prefs.setString('BT.SERVICE_UUID', '0000ffe0-0000-1000-8000-00805f9b34fb');
-      if (!prefs.containsKey('BT.SERVICE_UUID_DEFAULT')) prefs.setString('BT.SERVICE_UUID_DEFAULT', '0000ffe0-0000-1000-8000-00805f9b34fb');
+    return this._sharedPreferencesInternal;
+  }
 
-      if (!prefs.containsKey('BT.CHARACTERISTIC_UUID')) prefs.setString('BT.CHARACTERISTIC_UUID', '0000ffe1-0000-1000-8000-00805f9b34fb');
-      if (!prefs.containsKey('BT.CHARACTERISTIC_UUID_DEFAULT')) prefs.setString('BT.CHARACTERISTIC_UUID_DEFAULT', '0000ffe1-0000-1000-8000-00805f9b34fb');
+  PreferencesHandler._internal();
 
-      if (!prefs.containsKey('MAP.USING_ADVANCED')) prefs.setBool('MAP.USING_ADVANCED', false);
-      if (!prefs.containsKey('MAP.USING_ADVANCED_DEFAULT')) prefs.setBool('MAP.USING_ADVANCED_DEFAULT', false);
+  Future<int> getPreferencesInt(String key) async => (await this._sharedPreferences).getInt(key);
+  Future<String> getPreferencesString(String key) async => (await this._sharedPreferences).getString(key);
+  Future<bool> getPreferencesBool(String key) async => (await this._sharedPreferences).getBool(key);
 
-      if (!prefs.containsKey('MAP.PROX.MAX_PER_QUERY')) prefs.setInt('MAP.PROX.MAX_PER_QUERY', 200);
-      if (!prefs.containsKey('MAP.PROX.MAX_PER_QUERY_DEFAULT')) prefs.setInt('MAP.PROX.MAX_PER_QUERY_DEFAULT', 200);
+  Future<dynamic> getPreferences(String key) async => (await this._sharedPreferences).get(key);
 
-      if (!prefs.containsKey('MAP.PROX.MAX_AGE_SECONDS')) prefs.setInt('MAP.PROX.MAX_AGE_SECONDS', 200);
-      if (!prefs.containsKey('MAP.PROX.MAX_AGE_SECONDS_DEFAULT')) prefs.setInt('MAP.PROX.MAX_AGE_SECONDS_DEFAULT', 200);
+  Future<void> setPreferencesInt(String key, int value) async => (await this._sharedPreferences).setInt(key, value);
+  Future<void> setPreferencesString(String key, String value) async => (await this._sharedPreferences).setString(key, value);
+  Future<void> setPreferencesBool(String key, bool value) async => (await this._sharedPreferences).setBool(key, value);
+  
+  Future<void> resetPreferences<T>(String key) async {
+    Function getter, setter;
+    switch (T) {
+      case int: 
+        getter = getPreferencesInt;
+        setter = setPreferencesInt;
+        break;
+      case bool:
+        getter = getPreferencesBool;
+        setter = setPreferencesBool;
+        break;
+      case String:
+        getter = getPreferencesString;
+        setter = setPreferencesString;
+    }
 
-      print('Setup Prefs ${prefs.getKeys()}');
-    });
+    T value = await getter(key + '_DEFAULT');
+    await setter(key, value);
   }
 
-  int getPreferencesInt(String key) => this._sharedPreferences.getInt(key);
-  String getPreferencesString(String key) => this._sharedPreferences.getString(key);
-  bool getPreferencesBool(String key) => this._sharedPreferences.getBool(key);
-
-  void setPreferencesInt(String key, int value) => this._sharedPreferences.setInt(key, value);
-  void setPreferencesString(String key, String value) => this._sharedPreferences.setString(key, value);
-  void setPreferencesBool(String key, bool value) => this._sharedPreferences.setBool(key, value);
-
+  void resetAllPreferences() async {
+    await (await this._sharedPreferences).setBool('BT.USING_ADVANCED', false);
+    await (await this._sharedPreferences).setString('BT.FREQUENT', '[ ]');
+    await (await this._sharedPreferences).setString('BT.SERVICE_UUID', '0000ffe0-0000-1000-8000-00805f9b34fb');
+    await (await this._sharedPreferences).setString('BT.CHARACTERISTIC_UUID', '0000ffe1-0000-1000-8000-00805f9b34fb');
+    await (await this._sharedPreferences).setBool('MAP.USING_ADVANCED', false);
+    await (await this._sharedPreferences).setInt('MAP.PROX.MAX_PER_QUERY', 200);
+    await (await this._sharedPreferences).setInt('MAP.PROX.MAX_AGE_SECONDS', 200);
+  }
 
   factory PreferencesHandler() => _singleton;
 }
\ No newline at end of file

lib/main.dart

-import 'dart:async';
-
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:device_preview/device_preview.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
 
-import 'package:logair_application/logic/controllers/home_controller.dart';
-import 'package:logair_application/logic/controllers/map_display_controller.dart';
-import 'package:logair_application/logic/handlers/data_handler.dart';
-import 'package:logair_application/logic/handlers/network_handler.dart';
-import 'package:logair_application/logic/handlers/position_handler.dart';
-import 'package:logair_application/logic/handlers/preference_handler.dart';
-import 'package:logair_application/logic/handlers/bluetooth_le_handler.dart';
 import 'package:logair_application/ui/routes/home.dart';
 import 'package:logair_application/localization/localization_delegate.dart';
 
@@ -26,16 +17,6 @@ void main() {
   runApp(displayMode ? DevicePreview(child: LogAirApplication()) : LogAirApplication());
 }
 
-Future<void> _startHandlers() async {
-  HomeController();
-  BTLEHandler();
-  NetworkHandler();
-  DataHandler();
-  PreferencesHandler();
-  PositionHandler();
-  MapDisplayController();
-}
-
 class LogAirApplication extends StatelessWidget {
   static const String _title = 'LogAir Connector';
 

lib/ui/base/battery_visualizer.dart

+
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:logair_application/services/battery_service.dart';
+import 'package:logair_application/ui/base/custom_paint.dart';
+import 'dart:math';
+
+class BatteryVisualizerWidget extends StatelessWidget {
+  BatteryVisualizerWidget(this.isLeft, {Key key}) : super(key: key);
+
+  Stream<int> getBatteryLevel2() async* {
+    Random r = new Random();
+    while (true) {
+      yield 100; //r.nextInt(100);
+      await Future.delayed(Duration(seconds: 10));
+    }
+  }
+
+  final bool isLeft;
+  Color getColor(int value) {
+    if (value <= 10) 
+      return Colors.red;
+    else if (10 < value && value <= 20)
+      return Colors.yellow;
+    else if (20 < value)
+      return Colors.green;
+    else 
+      return Colors.grey[100];
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return StreamBuilder<int>(
+      stream: this.isLeft ? BatteryService().getBatteryLevel() : getBatteryLevel2(),
+      initialData: 0,
+      builder: (context, snapshot) {
+        int data = snapshot.data;
+        return Stack(
+          children: [
+            CustomPaint(
+              size: Size.infinite,
+              painter: CardPainter(isLeft: this.isLeft, battery: data, color: getColor(data))
+            ),
+            Container(
+              alignment: Alignment.center,
+              child: Text("Battery $data"),
+            )
+          ]
+        );
+      }
+    );
+  }
+}
\ No newline at end of file