fix: outdated flutter and solidity code

hello_world/.metadata

@@ -4,7 +4,7 @@
 # This file should be version controlled and should not be manually edited.
 
 version:
-  revision: 77d935af4db863f6abd0b9c31c7e6df2a13de57b
+  revision: 5464c5bac742001448fe4fc0597be939379f88ea
   channel: stable
 
 project_type: app

hello_world/README.md

@@ -1,15 +1,16 @@
-<img src="screenshot/Flutter_and_Blockchain.jpg" width="70%">
+# hello_world
 
-# Project 1
-## Hello World (Flutter + Blockchain)
-A basic blockchain and flutter based project.
+A new Flutter project.
 
-|                                                          |                                                      |
-|----------------------------------------------------------|:----------------------------------------------------:|
-| <img src="screenshot/Screenshot_1.png" width="50%" >     | <img src="screenshot/Screenshot_2.png" width="50%" > |
-
-<img src="screenshot/Screenshot_3.png" width="50%" >
+## Getting Started
 
----
+This project is a starting point for a Flutter application.
 
-For tutorial of Hello World Dapp check [https://aniketambore.netlify.app/Developement/hello_world_dapp/](https://aniketambore.netlify.app/Developement/hello_world_dapp/)
+A few resources to get you started if this is your first Flutter project:
+
+- [Lab: Write your first Flutter app](https://flutter.dev/docs/get-started/codelab)
+- [Cookbook: Useful Flutter samples](https://flutter.dev/docs/cookbook)
+
+For help getting started with Flutter, view our
+[online documentation](https://flutter.dev/docs), which offers tutorials,
+samples, guidance on mobile development, and a full API reference.

hello_world/analysis_options.yaml

@@ -7,23 +7,7 @@
 
 # The following line activates a set of recommended lints for Flutter apps,
 # packages, and plugins designed to encourage good coding practices.
-include: package:flutter_lints/flutter.yaml
-
+include: package:very_good_analysis/analysis_options.2.4.0.yaml
 linter:
-  # The lint rules applied to this project can be customized in the
-  # section below to disable rules from the `package:flutter_lints/flutter.yaml`
-  # included above or to enable additional rules. A list of all available lints
-  # and their documentation is published at
-  # https://dart-lang.github.io/linter/lints/index.html.
-  #
-  # Instead of disabling a lint rule for the entire project in the
-  # section below, it can also be suppressed for a single line of code
-  # or a specific dart file by using the `// ignore: name_of_lint` and
-  # `// ignore_for_file: name_of_lint` syntax on the line or in the file
-  # producing the lint.
   rules:
-    # avoid_print: false  # Uncomment to disable the `avoid_print` rule
-    # prefer_single_quotes: true  # Uncomment to enable the `prefer_single_quotes` rule
-
-# Additional information about this file can be found at
-# https://dart.dev/guides/language/analysis-options
+    public_member_api_docs: false

hello_world/android/build.gradle

@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlin_version = '1.3.50'
+    ext.kotlin_version = '1.6.10'
     repositories {
         google()
         mavenCentral()

hello_world/contracts/HelloWorld.sol

@@ -1,15 +1,15 @@
 // SPDX-License-Identifier: MIT
-pragma solidity >=0.4.16 <0.9.0 ;
+
+pragma solidity ^0.8.7;
 
 contract HelloWorld {
-    string public yourName ;
+    string public yourName;
 
-    constructor(){
-        yourName = "Unknown" ;
+    constructor() {
+        yourName = "Unknown";
     }
 
-    function setName(string memory name) public {
-        yourName = name;
+    function setName(string memory nm) public{
+		yourName = nm;
     }
-
-}
+}

hello_world/ios/Runner/Info.plist

@@ -42,6 +42,6 @@
 		<string>UIInterfaceOrientationLandscapeRight</string>
 	</array>
 	<key>UIViewControllerBasedStatusBarAppearance</key>
-	<true/>
+	<false/>
 </dict>
 </plist>

hello_world/lib/contract_linking.dart

@@ -1,82 +1,89 @@
+// ignore_for_file: public_member_api_docs
+
+import 'dart:async';
 import 'dart:convert';
 
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
-import 'package:http/http.dart';
-import 'package:dart_web3/dart_web3.dart';
+import 'package:http/http.dart' as http;
+import 'package:web3dart/web3dart.dart';
 import 'package:web_socket_channel/io.dart';
 
 class ContractLinking extends ChangeNotifier {
-  final String _rpcURl = "http://10.0.2.2:7545";
-  final String _wsURl = "ws://10.0.2.2:7545/";
+  ContractLinking() {
+    initialSetup();
+  }
+
+  final String _rpcUrl = 'http://127.0.0.1:7545';
+  final String _wsUrl = 'ws://10.0.2.2:7545/';
   final String _privateKey =
-      "a3a3229cdc4e6cc94e79c7f5d34f2e7d761fc4116707e82b0e6bbe296b51c153";
+      'f7c4e01b7af6c36ef6f50d21926f2e90c5f0305350e6a74b6bdc8d0c27693270';
 
+  bool isLoading = true;
   late Web3Client _client;
   late String _abiCode;
-
   late EthereumAddress _contractAddress;
   late Credentials _credentials;
-
   late DeployedContract _contract;
   late ContractFunction _yourName;
   late ContractFunction _setName;
+  late String deployedName;
 
-  bool isLoading = true;
-  String? deployedName;
-
-  ContractLinking() {
-    initialSetup();
-  }
-
-  initialSetup() async {
+  Future<void> initialSetup() async {
     // establish a connection to the ethereum rpc node. The socketConnector
     // property allows more efficient event streams over websocket instead of
     // http-polls. However, the socketConnector property is experimental.
-    _client = Web3Client(_rpcURl, Client(), socketConnector: () {
-      return IOWebSocketChannel.connect(_wsURl).cast<String>();
-    });
+    _client = Web3Client(
+      _rpcUrl,
+      http.Client(),
+      socketConnector: () {
+        return IOWebSocketChannel.connect(_wsUrl).cast<String>();
+      },
+    );
 
     await getAbi();
-    await getCredentials();
+    getCredentials();
     await getDeployedContract();
   }
 
   Future<void> getAbi() async {
     // Reading the contract abi
-    String abiStringFile =
-        await rootBundle.loadString("src/artifacts/HelloWorld.json");
-    var jsonAbi = jsonDecode(abiStringFile);
-    _abiCode = jsonEncode(jsonAbi["abi"]);
-    // print(_abiCode);
-
-    _contractAddress =
-        EthereumAddress.fromHex(jsonAbi["networks"]["5777"]["address"]);
-    // print(_contractAddress);
+    final abiStringFile =
+        await rootBundle.loadString('src/artifacts/HelloWorld.json');
+    final jsonAbi = jsonDecode(abiStringFile) as Map<String, dynamic>;
+    _abiCode = jsonEncode(jsonAbi['abi']);
+
+    _contractAddress = EthereumAddress.fromHex(
+      // ignore: avoid_dynamic_calls
+      jsonAbi['networks']['5777']['address'] as String,
+    );
   }
 
-  Future<void> getCredentials() async {
+  void getCredentials() {
     _credentials = EthPrivateKey.fromHex(_privateKey);
-    // print(_credentials);
   }
 
   Future<void> getDeployedContract() async {
     // Telling Web3dart where our contract is declared.
     _contract = DeployedContract(
-        ContractAbi.fromJson(_abiCode, "HelloWorld"), _contractAddress);
+      ContractAbi.fromJson(_abiCode, 'HelloWorld'),
+      _contractAddress,
+    );
 
     // Extracting the functions, declared in contract.
-    _yourName = _contract.function("yourName");
-    _setName = _contract.function("setName");
-    getName();
+    _yourName = _contract.function('yourName');
+    _setName = _contract.function('setName');
+    await getName();
   }
 
   Future<void> getName() async {
     // Getting the current name declared in the smart contract.
-    var currentName = await _client
-        .call(contract: _contract, function: _yourName, params: []);
-    // print(currentName);
-    deployedName = currentName[0];
+    final currentName = await _client.call(
+      contract: _contract,
+      function: _yourName,
+      params: <dynamic>[],
+    );
+    deployedName = currentName[0] as String;
     isLoading = false;
     notifyListeners();
   }
@@ -86,15 +93,13 @@ class ContractLinking extends ChangeNotifier {
     isLoading = true;
     notifyListeners();
     await _client.sendTransaction(
-        _credentials,
-        Transaction.callContract(
-          contract: _contract,
-          function: _setName,
-          parameters: [nameToSet],
-          // gasPrice: EtherAmount.inWei(BigInt.one),
-          // maxGas: 100000,
-          // value: EtherAmount.fromUnitAndValue(EtherUnit.ether, 1),
-        ));
-    getName();
+      _credentials,
+      Transaction.callContract(
+        contract: _contract,
+        function: _setName,
+        parameters: <dynamic>[nameToSet],
+      ),
+    );
+    await getName();
   }
 }

hello_world/lib/hello.dart

@@ -0,0 +1,88 @@
+import 'package:flutter/material.dart';
+import 'package:hello_world/contract_linking.dart';
+import 'package:provider/provider.dart';
+
+class Hello extends StatelessWidget {
+  const Hello({Key? key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    // Getting the value and object or contract_linking
+    final contractLink = Provider.of<ContractLinking>(context);
+    final yourNameController = TextEditingController();
+
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Hello World !'),
+        centerTitle: true,
+      ),
+      body: Container(
+        padding: const EdgeInsets.symmetric(horizontal: 20),
+        child: Center(
+          child: contractLink.isLoading
+              ? const CircularProgressIndicator()
+              : SingleChildScrollView(
+                  child: Form(
+                    child: Column(
+                      children: [
+                        Row(
+                          mainAxisAlignment: MainAxisAlignment.center,
+                          children: [
+                            const Flexible(
+                              child: Text(
+                                'Hello ',
+                                style: TextStyle(
+                                  fontWeight: FontWeight.bold,
+                                  fontSize: 32,
+                                ),
+                              ),
+                            ),
+                            Flexible(
+                              child: Text(
+                                contractLink.deployedName,
+                                style: const TextStyle(
+                                  fontWeight: FontWeight.bold,
+                                  fontSize: 32,
+                                  color: Colors.tealAccent,
+                                ),
+                              ),
+                            ),
+                          ],
+                        ),
+                        Padding(
+                          padding: const EdgeInsets.only(top: 29),
+                          child: TextFormField(
+                            controller: yourNameController,
+                            decoration: const InputDecoration(
+                              border: OutlineInputBorder(),
+                              labelText: 'Your Name',
+                              hintText: 'What is your name ?',
+                              icon: Icon(Icons.drive_file_rename_outline),
+                            ),
+                          ),
+                        ),
+                        Padding(
+                          padding: const EdgeInsets.only(top: 30),
+                          child: ElevatedButton(
+                            style: ElevatedButton.styleFrom(
+                              primary: Colors.green,
+                            ),
+                            onPressed: () {
+                              contractLink.setName(yourNameController.text);
+                              yourNameController.clear();
+                            },
+                            child: const Text(
+                              'Set Name',
+                              style: TextStyle(fontSize: 30),
+                            ),
+                          ),
+                        )
+                      ],
+                    ),
+                  ),
+                ),
+        ),
+      ),
+    );
+  }
+}