**Final Project and Advanced Topics** **Begin working on the final project, integrating all concepts learned to create a complete React Native application.(Lab topic)** Congratulations on reaching the final stage of the course! In this lab topic, you will integrate all the concepts learned throughout the course to create a complete React Native application. This project will help you reinforce your understanding of the material and prepare you for real-world mobile app development. **Project Overview** For this project, you will create a simple mobile application that allows users to track their daily expenses. The application will have the following features: * A list of expense categories * A form to input new expenses * A button to calculate the total expenses * A counter to display the total number of expenses **Requirements** To complete this project, you will need to incorporate the following concepts: * React Native navigation (using Expo Navigation) * State management with Redux * Local storage using AsyncStorage * API integration (using Fetch API and Axios) * Performance optimization techniques * Styling and theming with Styled Components * Testing with Jest and React Native Testing Library **Step 1: Set up the project structure** Create a new React Native project using the Expo CLI: ```bash npx create-expo-app expenses-tracker ``` Set up the project structure to include the following folders: * `components`: for all React components * `models`: for Redux actions and reducers * `services`: for API integration * `screens`: for navigation * `styles`: for styling and theming **Step 2: Implement navigation** Create a new file `Navigation.js` in the `screens` folder: ```jsx import { createBottomTabNavigator } from 'react-navigation'; import HomeScreen from './HomeScreen'; import ExpensesScreen from './ExpensesScreen'; import AddExpenseScreen from './AddExpenseScreen'; const Navigation = createBottomTabNavigator({ Home: { screen: HomeScreen, navigationOptions: { title: 'Home', }, }, Expenses: { screen: ExpensesScreen, navigationOptions: { title: 'Expenses', }, }, AddExpense: { screen: AddExpenseScreen, navigationOptions: { title: 'Add Expense', }, }, }); export default Navigation; ``` **Step 3: Implement state management with Redux** Create a new file `store.js` in the `models` folder: ```jsx import { createStore, combineReducers } from 'redux'; import { expensesReducer } from './expensesReducer'; const rootReducer = combineReducers({ expenses: expensesReducer, }); const store = createStore(rootReducer); export default store; ``` Create a new file `expensesReducer.js` in the `models` folder: ```jsx const initialState = { expenses: [], totalExpenses: 0, }; const expensesReducer = (state = initialState, action) => { switch (action.type) { case 'ADD_EXPENSE': return { ...state, expenses: [...state.expenses, action.expense], totalExpenses: state.totalExpenses + action.expense, }; default: return state; } }; export default expensesReducer; ``` **Step 4: Implement local storage** Create a new file `Expense.js` in the `components` folder: ```jsx import React, { useState, useEffect } from 'react'; import { AsyncStorage } from 'react-native'; const Expense = ({ expense }) => { const [expensiveExpense, setExpensiveExpense] = useState(false); useEffect(() => { const retrieveExpenses = async () => { const expenses = await AsyncStorage.getItem('expenses'); if (expenses) { setExpensiveExpense(JSON.parse(expenses)); } }; retrieveExpenses(); }, []); const handleExpenseChange = (value) => { const updatedExpenses = [...expensiveExpense, value]; setExpensiveExpense(updatedExpenses); AsyncStorage.setItem('expenses', JSON.stringify(updatedExpenses)); }; return ( <View> <Text>{expense.name}</Text> <Text>{expense.value}</Text> <Button title="Add Expense" onPress={() => handleExpenseChange(expense.value)} /> </View> ); }; export default Expense; ``` **Step 5: Implement API integration** Create a new file `api.js` in the `services` folder: ```jsx import fetch from 'isomorphic-fetch'; import axios from 'axios'; const API_URL = 'https://api.example.com/expenses'; const fetchExpenses = async () => { const response = await fetch(API_URL); const data = await response.json(); return data; }; const addExpense = async (expense) => { const response = await axios.post(API_URL, expense); return response.data; }; export { fetchExpenses, addExpense }; ``` **Step 6: Implement performance optimization techniques** Create a new file `ExpenseList.js` in the `components` folder: ```jsx import React from 'react'; import { FlatList } from 'react-native'; const ExpenseList = ({ expenses }) => { return ( <FlatList data={expenses} renderItem={({ item }) => ( <View> <Text>{item.name}</Text> <Text>{item.value}</Text> </View> )} keyExtractor={(item) => item.id} /> ); }; export default ExpenseList; ``` **Step 7: Implement styling and theming** Create a new file `styles.js` in the `styles` folder: ```jsx import { StyleSheet } from 'react-native'; const styles = StyleSheet.create({ container: { flex: 1, justifyContent: 'center', alignItems: 'center', }, expenseList: { flex: 1, justifyContent: 'center', alignItems: 'center', }, }); export default styles; ``` **Step 8: Implement testing** Create a new file `tests.js` in the `tests` folder: ```jsx import { render } from '@testing-library/react-native'; import { Navigation } from './Navigation'; import { store } from './store'; describe('Navigation', () => { it('renders the home screen', () => { const tree = render(<Navigation />); expect(tree).toMatchSnapshot(); }); it('navigates to the expenses screen', () => { const tree = render(<Navigation />); expect(tree).toMatchSnapshot(); }); }); ``` **Conclusion** Congratulations on completing the final project and advanced topics! This project should help you reinforce your understanding of the material and prepare you for real-world mobile app development. Make sure to review the code and understand the concepts that were covered. **Leave a comment or ask for help**: If you have any questions or need help with the project, please leave a comment below or ask for help in the discussion board. **External resources**: * Expo Navigation: <https://docs.expo.io/versions/latest/guides/navigating/> * Redux: <https://redux.js.org/introduction/> * AsyncStorage: <https://reactnative.dev/docs/asyncstorage> * Fetch API: <https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API> * Axios: <https://axios-http.com/docs/intro> Note: This is just a sample project, and you may need to modify it to fit your specific needs. Also, make sure to follow the best practices for mobile app development, such as using a consistent coding style and following the Expo guidelines.