This project is meant for those with a basic knowledge of Ethereum and smart contracts, who have some knowledge of the Flutter framework but are new to mobile dapps.

Flutter and Blockchain

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

Truffle is the most popular development framework for Ethereum with a mission to make your life a whole lot easier. But before we install truffle make sure to install node .

Once we have node installed, we only need one command to install Truffle: npm install -g truffle

We will also be using Ganache, a personal blockchain for Ethereum development you can use to deploy smart contracts, develop applications, and run tests. You can download Ganache by navigating to http://truffleframework.com/ganache and clicking the “Download” button.

Directory Structure

• contracts/ : Contains solidity contract file.
• 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 configurations information.

Compiling and Migrating Smart Contract

Compilation

In the terminal, make sure you are in the root of the directory that contains the flutter and truffle project, Run the following command: truffle compile

You should see output similar to the following:

Migration

Before we can migrate our contract to the blockchain, we need to have a blockchain running. We’re going to use Ganache, a personal blockchain for Ethereum development you can use to deploy contracts, develop applications, and run tests. If you haven’t already, download Ganache and double-click the icon to launch the application. This will generate a blockchain running locally on port 7545.

• Migrating the contract to the blockchain, run: truffle migrate

You should see output similar to the following:

• Take a look into the Ganache, the first account originally had 100 ether, it is now lower, due to the transaction costs of migration.

Testing the Smart Contract

• Running the test as: truffle test
• If all the test pass, you’ll see the console output similar to this:

Contract Linking

📁 project(eg. helloworld,bidder,...)
    📁 lib
        🎯 contract_linking.dart
          - Update _rpcUrl, _wsUrl, _privateKey as per your needs.

• You can get the RPC URL from the ganache :

• Get the Private Key from ganache:

• After Contract Linking, Just run the Flutter Project.

DAPPS

Hello World Dapp	Population Dapp

Bidder	Minter

Cat Adoption	Election

Tutorials

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

Contributing:

• 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.

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