added the libary

loc_chain_app/android/app/src/main/AndroidManifest.xml

@@ -1,5 +1,14 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.example.loc_chain_app">
+    <!-- Required for Nearby Connections -->
+    <uses-permission android:name="android.permission.BLUETOOTH" />
+    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
+    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
+    <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
+    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
+
+
    <application
         android:label="loc_chain_app"
         android:icon="@mipmap/ic_launcher">

loc_chain_app/lib/main.dart

@@ -1,7 +1,10 @@
 import 'package:flutter/material.dart';
+import 'package:shared_preferences/shared_preferences.dart';
 import 'package:loc_chain_app/widgets/navbar.dart';
 
-void main() {
+void main() async {
+  final prefs = await SharedPreferences.getInstance();
+
   runApp(App());
 }
 

loc_chain_app/lib/pages/bluetooth.dart

@@ -0,0 +1,28 @@
+import 'dart:io';
+import 'dart:math';
+import 'dart:typed_data';
+
+import 'package:flutter/material.dart';
+import 'package:nearby_connections/nearby_connections.dart';
+
+class BluetoothPage extends StatefulWidget {
+  BluetoothPage({Key key, this.title}) : super(key: key);
+  final String title;
+
+  @override
+  _BluetoothPageState createState() => _BluetoothPageState();
+}
+
+class _BluetoothPageState extends State<BluetoothPage> {
+  final String userName = Random().nextInt(10000).toString();
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(widget.title),
+      ),
+      body: Center(),
+    );
+  }
+}

loc_chain_app/lib/pages/settings.dart

@@ -0,0 +1,106 @@
+import 'package:flutter/material.dart';
+import 'package:nearby_connections/nearby_connections.dart';
+
+class SettingsPage extends StatefulWidget {
+  SettingsPage({Key key, this.title}) : super(key: key);
+  final String title;
+
+  @override
+  _SettingsPageState createState() => _SettingsPageState();
+}
+
+class _SettingsPageState extends State<SettingsPage> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(widget.title),
+      ),
+      body: Center(
+        child: ListView(children: <Widget>[
+          Text(
+            "Permissions",
+          ),
+          Wrap(
+            children: <Widget>[
+              ElevatedButton(
+                child: Text("checkLocationPermission"),
+                onPressed: () async {
+                  if (await Nearby().checkLocationPermission()) {
+                    ScaffoldMessenger.of(context).showSnackBar(SnackBar(
+                        content: Text("Location permissions granted :)")));
+                  } else {
+                    ScaffoldMessenger.of(context).showSnackBar(SnackBar(
+                        content: Text("Location permissions not granted :(")));
+                  }
+                },
+              ),
+              ElevatedButton(
+                child: Text("askLocationPermission"),
+                onPressed: () async {
+                  if (await Nearby().askLocationPermission()) {
+                    ScaffoldMessenger.of(context).showSnackBar(SnackBar(
+                        content: Text("Location Permission granted :)")));
+                  } else {
+                    ScaffoldMessenger.of(context).showSnackBar(SnackBar(
+                        content: Text("Location permissions not granted :(")));
+                  }
+                },
+              ),
+              ElevatedButton(
+                child: Text("checkExternalStoragePermission"),
+                onPressed: () async {
+                  if (await Nearby().checkExternalStoragePermission()) {
+                    ScaffoldMessenger.of(context).showSnackBar(SnackBar(
+                        content:
+                            Text("External Storage permissions granted :)")));
+                  } else {
+                    ScaffoldMessenger.of(context).showSnackBar(SnackBar(
+                        content: Text(
+                            "External Storage permissions not granted :(")));
+                  }
+                },
+              ),
+              ElevatedButton(
+                child: Text("askExternalStoragePermission"),
+                onPressed: () {
+                  Nearby().askExternalStoragePermission();
+                },
+              ),
+            ],
+          ),
+          Divider(),
+          Text("Location Enabled"),
+          Wrap(
+            children: <Widget>[
+              ElevatedButton(
+                child: Text("checkLocationEnabled"),
+                onPressed: () async {
+                  if (await Nearby().checkLocationEnabled()) {
+                    ScaffoldMessenger.of(context).showSnackBar(
+                        SnackBar(content: Text("Location is ON :)")));
+                  } else {
+                    ScaffoldMessenger.of(context).showSnackBar(
+                        SnackBar(content: Text("Location is OFF :(")));
+                  }
+                },
+              ),
+              ElevatedButton(
+                child: Text("enableLocationServices"),
+                onPressed: () async {
+                  if (await Nearby().enableLocationServices()) {
+                    ScaffoldMessenger.of(context).showSnackBar(
+                        SnackBar(content: Text("Location Service Enabled :)")));
+                  } else {
+                    ScaffoldMessenger.of(context).showSnackBar(SnackBar(
+                        content: Text("Enabling Location Service Failed :(")));
+                  }
+                },
+              ),
+            ],
+          ),
+        ]),
+      ),
+    );
+  }
+}

loc_chain_app/lib/widgets/navbar.dart

@@ -2,6 +2,9 @@ import 'package:flutter/material.dart';
 import 'package:loc_chain_app/pages/home.dart';
 import 'package:loc_chain_app/pages/keygen.dart';
 
+import '../pages/bluetooth.dart';
+import '../pages/settings.dart';
+
 class NavBarWidget extends StatefulWidget {
   NavBarWidget({Key key}) : super(key: key);
 
@@ -16,9 +19,15 @@ class _NavBarWidgetState extends State<NavBarWidget> {
     HomePage(
       title: 'Home',
     ),
+    BluetoothPage(
+      title: 'Connect',
+    ),
     KeygenPage(
       title: 'RSA Configuration',
     ),
+    SettingsPage(
+      title: 'Settings',
+    )
   ];
   void _onItemTapped(int index) => setState(() {
         _selectedIndex = index;
@@ -35,11 +44,21 @@ class _NavBarWidgetState extends State<NavBarWidget> {
               label: 'Home',
               backgroundColor: Colors.cyan,
             ),
+            BottomNavigationBarItem(
+              icon: Icon(Icons.bluetooth),
+              label: 'Connect',
+              backgroundColor: Colors.cyan,
+            ),
             BottomNavigationBarItem(
               icon: Icon(Icons.lock_rounded),
               label: 'RSA Configuration',
               backgroundColor: Colors.cyan,
             ),
+            BottomNavigationBarItem(
+              icon: Icon(Icons.lock_rounded),
+              label: 'Settings',
+              backgroundColor: Colors.cyan,
+            ),
           ],
           currentIndex: _selectedIndex,
           selectedItemColor: Colors.lightBlueAccent,

loc_chain_app/pubspec.lock

@@ -64,6 +64,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.2.0"
+  ffi:
+    dependency: transitive
+    description:
+      name: ffi
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.0.0"
+  file:
+    dependency: transitive
+    description:
+      name: file
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "6.1.0"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -74,6 +88,18 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_web_plugins:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  js:
+    dependency: transitive
+    description:
+      name: js
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.6.3"
   matcher:
     dependency: transitive
     description:
@@ -88,6 +114,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.3.0"
+  nearby_connections:
+    dependency: "direct main"
+    description:
+      name: nearby_connections
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.1"
   path:
     dependency: transitive
     description:
@@ -95,6 +128,41 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.8.0"
+  path_provider_linux:
+    dependency: transitive
+    description:
+      name: path_provider_linux
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
+  path_provider_platform_interface:
+    dependency: transitive
+    description:
+      name: path_provider_platform_interface
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.1"
+  path_provider_windows:
+    dependency: transitive
+    description:
+      name: path_provider_windows
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
+  platform:
+    dependency: transitive
+    description:
+      name: platform
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.0"
+  plugin_platform_interface:
+    dependency: transitive
+    description:
+      name: plugin_platform_interface
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
   pointycastle:
     dependency: transitive
     description:
@@ -102,6 +170,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.1"
+  process:
+    dependency: transitive
+    description:
+      name: process
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "4.2.1"
   rsa_encrypt:
     dependency: "direct main"
     description:
@@ -109,6 +184,48 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.0.5"
+  shared_preferences:
+    dependency: "direct main"
+    description:
+      name: shared_preferences
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.5"
+  shared_preferences_linux:
+    dependency: transitive
+    description:
+      name: shared_preferences_linux
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
+  shared_preferences_macos:
+    dependency: transitive
+    description:
+      name: shared_preferences_macos
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
+  shared_preferences_platform_interface:
+    dependency: transitive
+    description:
+      name: shared_preferences_platform_interface
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
+  shared_preferences_web:
+    dependency: transitive
+    description:
+      name: shared_preferences_web
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
+  shared_preferences_windows:
+    dependency: transitive
+    description:
+      name: shared_preferences_windows
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -170,5 +287,20 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.0"
+  win32:
+    dependency: transitive
+    description:
+      name: win32
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.5"
+  xdg_directories:
+    dependency: transitive
+    description:
+      name: xdg_directories
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.2.0"
 sdks:
-  dart: ">=2.12.0-0.0 <3.0.0"
+  dart: ">=2.12.0 <3.0.0"
+  flutter: ">=1.20.0"

loc_chain_app/pubspec.yaml

@@ -18,13 +18,14 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.7.0 <3.0.0"
+  sdk: ">=2.12.0 <3.0.0"
 
 dependencies:
   flutter:
     sdk: flutter
-
+  nearby_connections: ^3.0.0
-
+  shared_preferences: ^2.0.5
+  
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^1.0.2