Getting Started with Flutter and Blockchain

This project is designed for individuals with a foundational understanding of Ethereum and smart contracts, along with some familiarity with the Flutter framework. If you are entering the world of mobile decentralized applications (dapps), you’re in the right place!

Table of Contents

• Setting up the Development Environment
• Directory Structure
• Compiling and Migrating Smart Contract
• Testing the Smart Contract
• Contract Linking
• Dapps
• Tutorials
• Contributing

Setting up the Development Environment

To start off, we will need Node.js installed on your machine. Once it’s up and running, installing Truffle is just one command away:

npm install -g truffle

We will further need Ganache, a personal Ethereum blockchain that offers you the perfect playground to deploy smart contracts and develop applications. You can easily download Ganache from the provided link.

Directory Structure

• contracts: Contains Solidity contract files.
• migrations: Contains migration script files (Truffle uses a migration system to handle contract deployment).
• test: Contains test script files.
• truffle-config.js: Contains Truffle deployment configuration information.

Compiling and Migrating Smart Contract

Compilation

To compile your smart contracts, make sure you are in the terminal root of your project directory and run:

truffle compile

If successful, your terminal should showcase outputs indicating the compilation status.

Migration

Before migrating your contract to the blockchain, ensure that Ganache is running on your machine. Once Ganache is active, execute the following command to migrate your contract:

truffle migrate

Note that your account’s ether balance may have changed due to transaction costs from migration.

Testing the Smart Contract

To ensure everything is functioning correctly, you can run tests by executing:

truffle test

Contract Linking

When linking projects such as helloworld or bidder, you need to configure your contract_linking.dart file. Update the _rpcUrl, _wsUrl, and _privateKey as necessary. Your RPC URL can be obtained from Ganache, as shown below:

After linking your contract, simply run your Flutter project and you’re good to go!

Dapps

Here are a few examples of Dapps you can create:

• Hello World Dapp
• Population Dapp
• Bidder Dapp
• Minter Dapp
• Cat Adoption Dapp
• Election Dapp

Tutorials

• Flutter and Blockchain – Hello World Dapp
• Flutter and Blockchain – Population Dapp

Contributing

Want to contribute? Here’s how you can help:

• Fork it!
• Create your feature branch: git checkout -b my-new-feature
• Commit your changes: git commit -am 'Add some feature'
• Push to the branch: git push origin my-new-feature
• Submit a pull request!

Troubleshooting Tips

If you encounter issues, check the following common problems:

• Ensure that your Node.js and Truffle installations are correctly set up.
• Verify that Ganache is running before migration commands.
• Make sure to input correct configuration in contract_linking.dart.

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