added sending and recieving tokens function

vidaia/android/app/build.gradle

@@ -44,7 +44,7 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.example.vidaia"
-        minSdkVersion 18
+        minSdkVersion 21
         targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName

vidaia/lib/pages/exchange/exchange_page_loader.dart

@@ -0,0 +1,67 @@
+import 'package:flutter/material.dart';
+import 'package:vidaia/main.dart';
+import 'package:vidaia/pages/exchange/exchange_page_stack.dart';
+import 'package:vidaia/pages/exchange/receive/recieve_page.dart';
+import 'package:vidaia/pages/exchange/send/send_page.dart';
+import 'package:vidaia/pages/home/history/buy_history_page.dart';
+import 'package:vidaia/pages/home/home/home_page.dart';
+import 'package:vidaia/pages/home/redeem/redeem_page.dart';
+import 'package:vidaia/repositories/dataRepository.dart';
+
+class ExchangePage extends StatefulWidget {
+  ExchangePage({Key? key}) : super(key: key);
+
+  @override
+  State<ExchangePage> createState() => _ExchangePageState();
+}
+
+class _ExchangePageState extends State<ExchangePage> {
+  late Future<bool> isDataLoaded;
+
+  DataRepository dataRepository = getIt.get<DataRepository>();
+
+  @override
+  void initState() {
+    super.initState();
+    isDataLoaded = dataRepository.init();
+  }
+
+  final _pages = [SendPage(), RecievePage()];
+
+  @override
+  Widget build(BuildContext context) {
+    return FutureBuilder<bool>(
+        future: isDataLoaded,
+        builder: (BuildContext context, AsyncSnapshot<bool> snapshot) {
+          if (snapshot.connectionState == ConnectionState.done && snapshot.data == true) {
+            return ExchangePageStack(_pages);
+          } else if (snapshot.connectionState == ConnectionState.done && snapshot.hasError) {
+            return Padding(
+              padding: const EdgeInsets.only(top: 30),
+              child: Text(
+                'Error: ${snapshot.error}',
+                style: TextStyle(fontSize: 20),
+              ),
+            );
+          } else {
+            return Center(
+              child: Column(
+                mainAxisAlignment: MainAxisAlignment.center,
+                children: [
+                  Center(
+                    child: CircularProgressIndicator(),
+                  ),
+                  SizedBox(
+                    height: 20,
+                  ),
+                  Text(
+                    "Loading data",
+                    style: TextStyle(color: Colors.black38, fontSize: 15, fontWeight: FontWeight.w400),
+                  ),
+                ],
+              ),
+            );
+          }
+        });
+  }
+}

vidaia/lib/pages/exchange/exchange_page_stack.dart

@@ -0,0 +1,119 @@
+import 'package:easy_localization/easy_localization.dart';
+import 'package:flutter/material.dart';
+import 'package:vidaia/utils/constants.dart';
+import 'package:vidaia/utils/wallet.dart';
+
+import '../../widgets/vidaia_drawer.dart';
+
+class ExchangePageStack extends StatefulWidget {
+  final List<Widget> list;
+
+  ExchangePageStack(this.list);
+
+  @override
+  State<ExchangePageStack> createState() => _ExchangePageStackState();
+}
+
+class _ExchangePageStackState extends State<ExchangePageStack> {
+  int _selectedIndex = 0;
+
+  @override
+  void initState() {
+    super.initState();
+  }
+
+  void _onItemTapped(int index) {
+    setState(() {
+      _selectedIndex = index;
+    });
+  }
+
+  var scaffoldKey = GlobalKey<ScaffoldState>();
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      backgroundColor: BACKGROUND,
+      key: scaffoldKey,
+      drawerEnableOpenDragGesture: false,
+      appBar: AppBar(
+        automaticallyImplyLeading: false,
+        elevation: 0,
+        backgroundColor: BACKGROUND,
+        toolbarHeight: 90,
+        title: Stack(alignment: AlignmentDirectional.centerEnd, children: [
+          Row(mainAxisAlignment: MainAxisAlignment.spaceBetween, children: [
+            Row(
+              children: [
+                Container(
+                  padding: EdgeInsets.only(
+                    left: 5,
+                  ),
+                  child: Image(
+                    image: AssetImage("assets/images/vidar.png"),
+                    height: 25,
+                  ),
+                ),
+                Container(
+                  padding: EdgeInsets.only(
+                    left: 5,
+                  ),
+                  child: Text(
+                    'VID',
+                    style: TextStyle(color: Colors.black),
+                  ),
+                ),
+              ],
+            ),
+            StreamBuilder<BigInt>(
+              //initialData: 0.0,
+              stream: checkBalance(),
+              builder: (context, snapshot) {
+                switch (snapshot.connectionState) {
+                  case ConnectionState.waiting:
+                    return Container(
+                        width: 20,
+                        height: 20,
+                        child: CircularProgressIndicator(
+                          strokeWidth: 2,
+                          color: PRIMARY_LIGHT,
+                        ));
+                  default:
+                    if (snapshot.hasError) {
+                      return Text(snapshot.error.toString());
+                    } else {
+                      final balance = snapshot.data.toString();
+
+                      return Text(balance,
+                          style: TextStyle(color: PRIMARY_DARK, fontSize: 16));
+                    }
+                }
+              },
+            ),
+          ]),
+        ]),
+        centerTitle: true,
+      ),
+      bottomNavigationBar: BottomNavigationBar(
+        selectedItemColor: PRIMARY,
+        unselectedItemColor: SECONDARY,
+        items: <BottomNavigationBarItem>[
+          BottomNavigationBarItem(
+            icon: Container(),
+            label: 'Send',
+          ),
+          BottomNavigationBarItem(
+            icon: Container(), 
+            label: 'Recieve'.tr()
+            ),
+        ],
+        currentIndex: _selectedIndex,
+        onTap: _onItemTapped,
+      ),
+      body: IndexedStack(
+        index: _selectedIndex,
+        children: widget.list,
+      ),
+    );
+  }
+}

vidaia/lib/pages/exchange/receive/recieve_page.dart

@@ -0,0 +1,46 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:vidaia/main.dart';
+import 'package:vidaia/repositories/dataRepository.dart';
+import 'package:qr_flutter/qr_flutter.dart';
+import 'package:vidaia/utils/globals.dart';
+
+class RecievePage extends StatefulWidget {
+  const RecievePage({Key? key}) : super(key: key);
+
+  @override
+  State<RecievePage> createState() => _RecievePageState();
+}
+
+class _RecievePageState extends State<RecievePage> {
+  DataRepository dataRepository = getIt.get<DataRepository>();
+
+  @override
+  Widget build(BuildContext context) {
+    return Row(
+      children: [
+        Expanded(
+          child: Container(),
+        ),
+        Column(
+          children: [
+            Container(child: Text('Recieve')),
+            QrImage(
+              data: address!,
+              size: 250,
+            ),
+            Text(address!),
+            TextButton(
+                onPressed: () {
+                  Clipboard.setData(ClipboardData(text: address));
+                },
+                child: Text('Copy Address')),
+          ],
+        ),
+        Expanded(
+          child: Container(),
+        ),
+      ],
+    );
+  }
+}

vidaia/lib/pages/exchange/scan_page.dart

@@ -0,0 +1,27 @@
+import 'package:flutter/material.dart';
+import 'package:mobile_scanner/mobile_scanner.dart';
+import 'package:vidaia/utils/globals.dart' as global;
+
+class ScanPage extends StatefulWidget {
+  const ScanPage({Key? key}) : super(key: key);
+
+  @override
+  State<ScanPage> createState() => _ScanPageState();
+}
+
+class _ScanPageState extends State<ScanPage> {
+
+  @override
+  Widget build(BuildContext context) {
+    return MobileScanner(
+          allowDuplicates: false,
+          controller: MobileScannerController(
+            facing: CameraFacing.back, torchEnabled: false),
+          onDetect: (barcode, args) {
+            final String code = barcode.rawValue!;
+            global.qrCode = code;
+            debugPrint('Barcode found! $code');
+            Navigator.pop(context);
+          });
+  }
+}

vidaia/lib/pages/exchange/send/send_page.dart

@@ -0,0 +1,88 @@
+import 'package:easy_localization/easy_localization.dart';
+import 'package:flutter/material.dart';
+import 'package:vidaia/main.dart';
+import 'package:vidaia/pages/exchange/scan_page.dart';
+import 'package:vidaia/repositories/dataRepository.dart';
+import 'package:mobile_scanner/mobile_scanner.dart';
+import 'package:vidaia/utils/globals.dart' as global;
+import 'package:vidaia/utils/wallet.dart';
+
+import '../../../utils/constants.dart';
+
+class SendPage extends StatefulWidget {
+  const SendPage({Key? key}) : super(key: key);
+
+  @override
+  State<SendPage> createState() => _SendPageState();
+}
+
+class _SendPageState extends State<SendPage> {
+  final addressController = TextEditingController();
+  final valueController = TextEditingController();
+
+  @override
+  void dispose() {
+    valueController.dispose();
+    addressController.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      children: [
+        Material(
+          type: MaterialType.transparency,
+          child: ListTile(
+            leading: const Icon(
+              Icons.qr_code,
+              color: PRIMARY_LIGHT,
+            ),
+            title: Text(
+              'Scan QRCode'.tr(),
+              style: Theme.of(context).textTheme.subtitle1,
+            ),
+            onTap: () {
+              Navigator.push(
+                context,
+                MaterialPageRoute(builder: (context) => ScanPage()),
+              );
+            },
+          ),
+        ),
+        Padding(
+          padding: const EdgeInsets.all(8.0),
+          child: TextField(
+
+            decoration: InputDecoration(
+                border: OutlineInputBorder(),
+                hintText: "Receiver's Address",
+              ),
+            controller: addressController,
+          ),
+        ),
+        Padding(
+          padding: const EdgeInsets.all(8.0),
+          child: TextField(
+            decoration: InputDecoration(
+                border: OutlineInputBorder(),
+                hintText: 'Amount',
+              ),
+            controller: valueController,
+          ),
+        ),
+                ElevatedButton(
+            onPressed: () {
+              addressController.text = '0x00bab3d8de4ebbefb07d53b1ff8c0f2434bd616d';
+            },
+            child: Text('set address')),
+        ElevatedButton(
+            onPressed: () {
+              transferVidar(int.parse(valueController.text),
+                  addressController.text, 'https://testnet.veblocks.net');
+            },
+            child: Text('Send')),
+      ],
+    );
+  }
+}

vidaia/lib/utils/globals.dart

@@ -12,6 +12,7 @@ bool loginStatus = false;
 List<String>? mnemonicPhrase;
 Uint8List? privateKey;
 Wallet? wallet;
+String? qrCode;
 
 bool mnemonicNoted = false;