Summary

Start a New Project
Third-party Library - Navigation
Packages
Create Folders and Files
Start Build Our App
Shop App
Redux Thunk
- Package
- Config Redux Thunk
  - Config - App.js
  - Use Redux Thunk - Actions
Authentication
- When The App Launches
  - Authentication Screen
- Auth Config
Local Storage - AsyncStorage
Great Places App
Environment Variables
Expo - Features
Local Database - SQLite

Start a New Project

  expo init 1_rn_first_app

During the creation of your new project
- Choose a template: blank
  - If we choose bare-mininum it won't config expo
CD to 1_rn_first_app
run npm start
- It will start the expo development tool

Third-party Library - Navigation

Go Back to Summary

Let's install a third-party library to help us to easily navigate and add animations between screens.
Import the fonts from ./assets/fonts/
```
  import * as Front from 'expo-font'
```
- If the library is not working we have to manually install it
- npm i expo-font
Import the AppLoading`` fromexpo` to prolong the splash screen when the app starts until our fonts are loaded

Packages

Go Back to Summary

  npm i react-navigation

then we need to stall a bunch of dependencies, just like we can find in the docs

  expo install react-native-gesture-handler react-native-reanimated react-native-screens react-native-safe-area-context @react-native-community/masked-view

React Navigation v4 or higher, we need to install the different navigators which so we can use StackNavigator, DrawerNavigator, TabsNavigator separately.
```
  npm install --save react-navigation-stack
```

Create Folders and Files

Go Back to Summary

Create folders and files

  ├─ 3_Meals_App
  │  ├─ .expo
  │  │  ├─ packager-info.json
  │  │  └─ settings.json
  │  ├─ .expo-shared
  │  │  └─ assets.json
  │  ├─ App.js
  │  ├─ app.json
  │  ├─ assets
  │  │  ├─ fonts                    <--- New
  │  │  │  ├─ OpenSans-Bold.ttf     <--- New
  │  │  │  └─ OpenSans-Regular.ttf  <--- New
  │  │  ├─ icon.png
  │  │  └─ splash.png
  │  ├─ babel.config.js
  │  ├─ components                  <--- New
  │  ├─ navigation                  <--- New
  │  │  └─ MealsNavigation.js       <--- New
  │  ├─ package-lock.json
  │  ├─ package.json
  │  └─ screens                     <--- New
  │     ├─ CategoriesScreen.js      <--- New
  │     ├─ CategoryMealsScreen.js   <--- New
  │     ├─ FavoritesScreen.js       <--- New
  │     ├─ FiltersScreen.js         <--- New
  │     └─ MealDetailScreen.js      <--- New
  └─ LICENSE

Start Build Our App

App.js

Go Back to Summary

Import

  import * as Font from 'expo-font';
  import { AppLoading } from 'expo';

Then create an external object (outside of our App function) so this object won't be rendered every time our component renders

Load our fonts

  const fetchFonts = () => {
      Font.loadAsync({
          'open-sans': require('./assets/fonts/OpenSans-Regular.ttf'),
          'open-sans-bold': require('./assets/fonts/OpenSans-Bold.ttf')
      });
  };

Then we create an useState to check if our fonts were completed loaded, and we use AppLoading to prolong our splash screen
- We assign the startAsync to fetch our fonts, AppLoading is a promise, then we can assign onFinish to execute an action once this promise is resolved
```
  const [fontLoaded, setFontLoaded] = useState(false);

  if (!fontLoaded) {
      return <AppLoading startAsync={fetchFonts} onFinish={setFontLoaded(true)} />;
  }
```

In the end we will have a structure like this:

  import React, { useState } from 'react';
  import { StyleSheet, Text, View } from 'react-native';
  import * as Font from 'expo-font';
  import { AppLoading } from 'expo';

  const fetchFonts = () => {
      Font.loadAsync({
          'open-sans': require('./assets/fonts/OpenSans-Regular.ttf'),
          'open-sans-bold': require('./assets/fonts/OpenSans-Bold.ttf')
      });
  };

  export default function App() {
      const [fontLoaded, setFontLoaded] = useState(false);

      if (!fontLoaded) {
          return <AppLoading startAsync={fetchFonts} onFinish={setFontLoaded(true)} />;
      }

      return (
          <View>
              <Text>Open up App.js to start working on your app!</Text>
          </View>
      );
  }

Meals Navigation

Go Back to Summary

in navigation/MealsNavigation.js
- We have to import createStackNavigator from react-navigator-stack
  - Then we need to call createStackNavigator, it takes at least on argument (a JS object) where we configure the different screens that we want to move between.
  - The object is a key/value pairs, and the convention is to capitalize the first letter of the key
    - The key could be andy name of our choice
    - The value, is a pointer to the screen that we want to load for this screen
      - To to that we have to import the screen then we map to the key
    - All component mapped in our createStackNavigator gets a special prop passed in automatically
      - Just the top level, not nested components
      - i.e navigate, pop, popToTop, push, replace, reset,
  - createStackNavigator returns a navigation container and it's a react component, so we can assign to a variable
- Then we need to add createAppContainer (createAppContainer is always imported from react-navigation no matter what version we are using).
  - We need to wrap our navigator with the createAppContainer
```
  import { createStackNavigator } from 'react-navigation-stack';

  import CategoriesScreen from '../screens/CategoriesScreen';
  import CategoryMealsScreen from '../screens/CategoryMealsScreen';
  import MealDetailScreen from '../screens/MealDetailScreen';
  import { createAppContainer } from 'react-navigation';

  const MealsNavigator = createStackNavigator({
      Categories: CategoriesScreen,
      CategoryMeals: {
          screen: CategoryMealsScreen
      },
      MealDetail: MealDetailScreen
  });

  export default createAppCon
```

in App.js

We import the MealsNavigation component, and use this component in our return

We also don't need the import { StyleSheet, Text, View } from 'react-native'; since we are not building anything on this screen

  import React, { useState } from 'react';
  import * as Font from 'expo-font';
  import { AppLoading } from 'expo';

  import MealsNavigation from './navigation/MealsNavigation';

  const fetchFonts = () => {
      Font.loadAsync({
          'open-sans': require('./assets/fonts/OpenSans-Regular.ttf'),
          'open-sans-bold': require('./assets/fonts/OpenSans-Bold.ttf')
      });
  };

  export default function App() {
      const [fontLoaded, setFontLoaded] = useState(false);

      if (!fontLoaded) {
          return <AppLoading startAsync={fetchFonts} onFinish={setFontLoaded(true)} />;
      }

      return <MealsNavigation />;
  }

CategoriesScreen.js

Go Back to Summary

  import React from 'react';
  import { View, Text, StyleSheet, Button } from 'react-native';

  function CategoriesScreen({ navigation }) {
      return (
          <View style={styles.screen}>
              <Text style={styles.stylesText}>CategoriesScreen</Text>
              <Button
                  title="Go to Meals!"
                  onPress={() => {
                      navigation.navigate({ routeName: 'CategoryMeals' });
                  }}
              />
          </View>
      );
  }

  const styles = StyleSheet.create({
      screen: {
          flex: 1,
          justifyContent: 'center',
          alignItems: 'center'
      },
      stylesText: {}
  });

  export default CategoriesScreen;

The navigation props, has a navigate method (The most important method) that we can navigate to a specific route
- navigate takes an object as an argument, and this object we can set up the route name to which we want to navigate
- the routeName has to be one of the route names that we specified in navigation/MealsNavigation.js
  - Then we point to a the route as a string
pushing, popping & replacing
- an alternative to navigation.navigate() we could use navigation.push('CategoryMeals')
  - This allows us to render the same screen over and over again, this is useful when the screen is the same, but we want to change the content (like a folder)
  - .goBack(), .pop, .goToTop() .replace()
- Oficial Docs

Shop App

Packages

Go Back to Summary

Create a new react native app
```
  expo init 4_rn_shop_app
```

Install

  npm i redux react-redux
    react-navigation
    react-navigation-header-buttons
    react-navigation-stack
    @expo/vector-icons
    react-navigation-drawer
    moment
  expo install react-native-gesture-handler
    react-native-reanimated
    react-native-screens
    react-native-safe-area-context
    @react-native-community/masked-view
    expo-font
  npm i --save-dev redux-devtools-extension

moment so we can use a nice date format like June 5, 2020, 12:15 PM, that is not supported by the android engine.

Folder and Files

Go Back to Summary

Create the following folder structure

  mkdir components css navigation screens screens/shop screens/user store store/actions store/reducers models database assets/fonts

Create the following files

  touch css/Colors.js screens/shop/ProductsOverviewScreen.js screens/shop/ProductDetailsScreen.js screens/shop/CartScreen.js screens/shop/OrdersScreen.js screens/user/UserProductsScreen.js screens/user/EditProductScreen.js store/actions/product.js store/reducers/product.js store/actions/users.js store/reducers/users.js models/products.js models/users.js database/dummy-data.js navigation/ShopNavigator.js

Folder structure

    4_Shop_App
    ├─ App.js
    ├─ app.json
    ├─ assets
    │  ├─ icon.png
    │  └─ splash.png
    ├─ babel.config.js
    ├─ components
    ├─ css
    │  └─ Colors.js
    ├─ database
    │  └─ dummy-data.js
    ├─ models
    │  ├─ product.js
    │  └─ user.js
    ├─ navigation
    │  └─ ShopNavigator.js
    ├─ package-lock.json
    ├─ package.json
    ├─ screens
    │  ├─ shop
    │  │  ├─ CartScreen.js
    │  │  ├─ OrdersScreen.js
    │  │  ├─ ProductDetailsScreen.js
    │  │  └─ ProductsOverviewScreen.js
    │  └─ user
    │     ├─ EditProductScreen.js
    │     └─ UserProductsScreen.js
    └─ store
      ├─ actions
      │  ├─ products.js
      │  └─ users.js
      └─ reducers
          ├─ products.js
          └─ users.js

Constants - Global "CSS"

Go Back to Summary

in css/Colors.js

Create one object (css constants) and export as default

  export default {
      primary: '#C2185B',
      accent: '#FFC107',
  };

Models - Schema

Go Back to Summary

Create a schema of our data, for now it's just a class constructor so we can easily identify how our data is structured.

in models/product.js

create and export as default our Product class

  class Product {
      constructor(id, ownerId, title, imageUrl, description, price) {
          this.id = id;
          this.ownerId = ownerId;
          this.title = title;
          this.imageUrl = imageUrl;
          this.description = description;
          this.price = price;
      }
  }

  export default Product;

Database - Dummy Data

Go Back to Summary

in database/dummy-data.js
- Add our dummy data

React Redux

Reducers

Go Back to Summary

in store/reducers/products.js

Create our products reducers, at first we are going to hard code the ownerId just to display something when the app loads (just to check if is wired up correctly)
Import our Products data base
Create an initialState (when the app loads)

return just the state

  import PRODUCTS from '../../database/dummy-data';

  const initialState = {
      availableProducts: PRODUCTS,
      userProducts: PRODUCTS.filter((product) => product.ownerId === 'u1'),
  };

  const productsReducer = (state = initialState, action) => {
      switch (action.type) {
          default:
              return state;
      }
  };

  export default productsReducer;

Create Redux Store

Go Back to Summary

in App.js

Import createStore and combineReducers from redux
Import Provider from react-redux
Import the products reducer
- Combine the reducers with combineReducers and assign to a new variable (rootReducer)
  - Create the store with createStore and pass the rootReducer
    - For last, wrap our main app with Provider component and connect store
Import AppLoading from expo
- So we can await for the app to load all the dependencies (fonts)
Import custom Fonts with expo-font
Import composeWithDevTools from redux-devtools-extension
- We use the redux-devtools-extension with React Native Debugger

  import React from 'react';
  import { createStore, combineReducers } from 'redux';
  import { Provider } from 'react-redux';
  import { AppLoading } from 'expo';
  import * as Font from 'expo-font';
  import { composeWithDevTools } from 'redux-devtools-extension'

  import productsReducer from './store/reducers/products';
  import ShopNavigator from './navigation/ShopNavigator';

  const rootReducer = combineReducers({
      products: productsReducer,
  });

  const store = createStore(rootReducer, composeWithDevTools());

  const fetchFonts = () => {
      return Font.loadAsync({
          'open-sans': require('./assets/fonts/OpenSans-Regular.ttf'),
          'open-sans-bold': require('./assets/fonts/OpenSans-Bold.ttf'),
      });
  };

  export default function App() {
      const [fontLoaded, setFontLoaded] = useState(false);

      if (!fontLoaded) {
          return (
              <AppLoading
                  startAsync={fetchFonts}
                  onFinish={() => {
                      setFontLoaded(true);
                  }}
              />
          );
      }

      return (
          <Provider store={store}>
              <ShopNavigator />
          </Provider>
      );
  }

Screens - ProductsOverviewScreen

Go Back to Summary

Create our first screen just to display the dummy data, to test our redux

in screens/shop/ProductsOverviewScreen.js

Import useSelector hook from react-redux to get data form the store
Import FlatList from react-native (alternative for .map())
- With FlatList we have to pass 2~3 properties
  - 1st - is our data (data={array_of_data})
  - 2nd - optional for the newer version of react (keyExtractor={(item) => item.id})
    - This is used for old versions of react where we need to extract the unique id
    - The newer version we don't need to that anymore
  - 3rd - renderItem{(itemData) => ...}
Add navigationOptions to the ProductsOverviewScreen component
- Where we can define the headerTitle for this specific screen

  import React from 'react';
  import { Text, FlatList } from 'react-native';
  import { useSelector } from 'react-redux';

  function ProductsOverviewScreen(props) {
      const products = useSelector((state) => state.products.availableProducts);

      return (
          <FlatList
              data={products}
              keyExtractor={(item) => item.id}
              renderItem={(itemData) => <Text>{itemData.item.title}</Text>}
          />
      );
  }

  ProductsOverviewScreen.navigationOptions = {
      headerTitle: 'All Products',
  };

  export default ProductsOverviewScreen;

Shop Navigator

Go Back to Summary

in navigation/ShopNavigator.js

Create our stack navigator for our app
- Import createStackNavigator from react-navigation-stack
  - This we have to use from ...-stack, older versions uses from react-navigation
- Import createAppContainer from react-navigation
- Import Platform from react-native, so we can differentiate the OS to use a custom style
- Import our screens (for now just ProductsOverviewScreen)
- Create our stack navigator and assign to a variable, the createStackNavigator returns a react component (our variable ProductsNavigator)
  - the first argument is an object where we define all the screen names
    - We could also define the style here, for that specific component, but for now we are going to use the default options
  - the second argument is an object where we can define our defaultNavigationOptions
    - Where we can define custom styles for our screens
- For last we create our app using createAppContainer and pass our ProductsNavigator

  import { createStackNavigator } from 'react-navigation-stack';
  import { createAppContainer } from 'react-navigation';
  import { Platform } from 'react-native';

  import Colors from '../css/Colors';

  import ProductsOverviewScreen from '../screens/shop/ProductsOverviewScreen';

  const ProductsNavigator = createStackNavigator(
      {
          ProductsOverview: ProductsOverviewScreen,
      },
      {
          defaultNavigationOptions: {
              headerStyle: {
                  backgroundColor: Platform.OS === 'android' ? Colors.primary : '',
              },
              headerTitleStyle: {
                  fontFamily: 'open-sans-bold',
              },
              headerBackTitleStyle: {
                  fontFamily: 'open-sans',
              },
              headerTintColor: Platform.OS === 'android' ? 'white' : Colors.primary,
          },
      },
  );

  export default createAppContainer(ProductsNavigator);

Redux Thunk

Package

Go Back to Summary

  npm i redux-thunk

Config Redux Thunk

Config - App.js

Go Back to Summary

In App.js

Import ReduxThunk from redux-thunk
- ReduxThunk can be any name
Import applyMiddleware from redux
- In createStore pass the applyMiddleware as a second argument and pass it ReduxThunk

  import React, { useState } from 'react';
  import { createStore, combineReducers, applyMiddleware } from 'redux';
  import { Provider } from 'react-redux';
  import { AppLoading } from 'expo';
  import * as Font from 'expo-font';
  import ReduxThunk from 'redux-thunk';

  import productsReducer from './store/reducers/products';
  import cartReducer from './store/reducers/cart';
  import ordersReducer from './store/reducers/orders';
  import ShopNavigator from './navigation/ShopNavigator';

  const rootReducer = combineReducers({
      ...
  });

  const store = createStore(rootReducer, applyMiddleware(ReduxThunk));

  const fetchFonts = () => {
      ...
  };

  export default function App() {
      ...
  }

Use Redux Thunk - Actions

Go Back to Summary

in store/actions/orders.js
Redux thunk already gives us a dispatch function by default

We can use the dispatch function to update our store after executing an async code (api calls)

  import Order from '../../models/order';
  export const ADD_ORDER = 'ADD_ORDER';
  export const SET_ORDERS = 'SET_ORDERS';

  export const fetchOrders = () => {
      try {
          return async (dispatch) => {
              const response = await fetch('https://react-native-7b3b3.firebaseio.com/orders/u1.json');

              if (!response.ok) {
                  throw new Error('Something went wrong!');
              }

              const resData = await response.json();
              const loadedOrders = [];

              for (const key in resData) {
                  loadedOrders.push(
                      new Order(
                          key,
                          resData[key].cartItems,
                          resData[key].totalAmount,
                          new Date(resData[key].date),
                      ),
                  );
              }

              dispatch({
                  type: SET_ORDERS,
                  orders: loadedOrders,
              });
          };
      } catch (error) {
          throw error;
      }
  };

  export const addOrder = (cartItems, totalAmount) => {
      try {
          const date = new Date().toISOString();

          return async (dispatch) => {
              const response = await fetch('https://react-native-7b3b3.firebaseio.com/orders/u1.json', {
                  method: 'POST',
                  headers: {
                      'Content-Type': 'application/json',
                  },
                  body: JSON.stringify({ cartItems, totalAmount, date }),
              });

              if (!response.ok) {
                  throw new Error('Something went wrong!');
              }

              const resData = await response.json();

              dispatch({
                  type: ADD_ORDER,
                  orderData: {
                      id: resData.name,
                      items: cartItems,
                      amount: totalAmount,
                      date,
                  },
              });
          };
      } catch (error) {
          throw error;
      }
  };

Authentication

When The App Launches

Go Back to Summary

In navigation/ShopNavigation

Import createSwitchNavigator from react-navigation
- This function will help use to authenticate the user with our backend
- This screen has a special behavior that it doesn't allow us to go back to the log in screen if you just logged in
First we need to create a new stack navigator to our auth screen
Then create a new navigator (MainNavigator) using createSwitchNavigator
- createSwitchNavigator takes an object, and there we bind our:
  - Auth screen / auth stack
  - Shop shop stack
- Auth screen will be rendered as our first screen

Update our createAppContainer to use our new MainNavigator stack

    import React from 'react';
    import { createStackNavigator } from 'react-navigation-stack';
    import { createAppContainer, createSwitchNavigator } from 'react-navigation';
    import { createDrawerNavigator } from 'react-navigation-drawer';
    import { Platform } from 'react-native';
    import { Ionicons } from '@expo/vector-icons';

    import Colors from '../css/Colors';

    import ProductsOverviewScreen from '../screens/shop/ProductsOverviewScreen';
    import ProductDetailsScreen from '../screens/shop/ProductDetailsScreen';
    import CartScreen from '../screens/shop/CartScreen';
    import OrdersScreen from '../screens/shop/OrdersScreen';
    import UserProductsScreen from '../screens/user/UserProductsScreen';
    import EditProductScreen from '../screens/user/EditProductScreen';
    import AuthScreen from "../screens/user/AuthScreen";

    const defaultNavOptions = {
        ...
    };

    const ProductsNavigator = createStackNavigator(
        ...
    );

    const OrdersNavigator = createStackNavigator(
        ...
    );

    const AdminNavigator = createStackNavigator(
        ...
    );

    const AuthNavigator = createStackNavigator({
        Auth: AuthScreen
    })

    const ShopNavigator = createDrawerNavigator(
        ...
    );

    const MainNavigator = createSwitchNavigator({
        Auth: AuthNavigator,
        Shop: ShopNavigator
    })

    export default createAppContainer(MainNavigator);

Authentication Screen

Go Back to Summary

create a new file screens/users/AuthScreen.js to handle handle the login/sign up form

After a successful login, the user will be redirect to the "Shop" screen

    import React, { useState, useReducer, useCallback, useEffect } from 'react';
    import {
        View,
        StyleSheet,
        ScrollView,
        KeyboardAvoidingView,
        Button,
        ActivityIndicator,
        Alert,
    } from 'react-native';
    import { LinearGradient } from 'expo-linear-gradient';
    import { useDispatch } from 'react-redux';

    import Input from '../../components/UI/Input';
    import Card from '../../components/UI/Card';
    import Colors from '../../css/Colors';
    import * as authActions from '../../store/actions/auth';

    const FORM_INPUT_UPDATE = 'FORM_INPUT_UPDATE';

    const formReducer = (state, action) => {
        switch (action.type) {
            case FORM_INPUT_UPDATE:
                const updatedValues = {
                    ...state.inputValues,
                    [action.input]: action.value,
                };
                const updatedValidities = {
                    ...state.inputValidities,
                    [action.input]: action.isValid,
                };
                let updatedFormIsValid = true;

                for (const key in updatedValidities) {
                    updatedFormIsValid = updatedFormIsValid && updatedValidities[key];
                }

                return {
                    formIsValid: updatedFormIsValid,
                    inputValidities: updatedValidities,
                    inputValues: updatedValues,
                };
            default:
                return state;
        }
    };

    function AuthScreen({ navigation }) {
        const [isSignup, setIsSignup] = useState(false);
        const [isLoading, setIsLoading] = useState(false);
        const [error, setError] = useState();
        const dispatch = useDispatch();

        const [formState, dispatchFormState] = useReducer(formReducer, {
            inputValues: {
                email: '',
                password: '',
            },
            inputValidities: {
                email: false,
                password: false,
            },
            formIsValid: false,
        });

        useEffect(() => {
            if (error) {
                Alert.alert('An Error Ocurred!', error, [{ text: 'Ok' }]);
            }
        }, [error]);

        const authHandler = async () => {
            let action;

            if (isSignup) {
                action = authActions.signup(formState.inputValues.email, formState.inputValues.password);
            } else {
                action = authActions.login(formState.inputValues.email, formState.inputValues.password);
            }

            setError(null);
            setIsLoading(true);

            try {
                await dispatch(action);
                navigation.navigate('Shop');
            } catch (error) {
                setError(error.message);
                setIsLoading(false);
            }
        };

        const inputChangeHandler = useCallback(
            (inputIdentifier, inputValue, inputValidity) => {
                dispatchFormState({
                    type: FORM_INPUT_UPDATE,
                    input: inputIdentifier,
                    value: inputValue,
                    isValid: inputValidity,
                });
            },
            [dispatchFormState],
        );

        return (
            <KeyboardAvoidingView behavior="padding" style={styles.screen}>
                <LinearGradient colors={['#ffedff', '#ffe3ff']} style={styles.gradient}>
                    <Card style={styles.authContainer}>
                        <ScrollView>
                            <Input
                                id="email"
                                label="E-Mail"
                                keyboardType="email-address"
                                required
                                email
                                autoCapitalize="none"
                                errorText="Please enter a valid e-mail address"
                                onInputChange={inputChangeHandler}
                                initialValue=""
                            />
                            <Input
                                id="password"
                                label="Password"
                                keyboardType="default"
                                secureTextEntry
                                required
                                minLength={5}
                                autoCapitalize="none"
                                errorText="Please enter a valid password"
                                onInputChange={inputChangeHandler}
                                initialValue=""
                            />

                            <View style={styles.buttonContainer}>
                                {isLoading ? (
                                    <ActivityIndicator size="small" color={Colors.primary} />
                                ) : (
                                    <Button
                                        title={isSignup ? 'Sign Up' : 'Login'}
                                        color={Colors.primary}
                                        onPress={authHandler}
                                    />
                                )}
                            </View>
                            <View style={styles.buttonContainer}>
                                <Button
                                    title={`Switch to ${isSignup ? 'Login' : 'Sign Up'}`}
                                    color={Colors.accent}
                                    onPress={() => setIsSignup(!isSignup)}
                                />
                            </View>
                        </ScrollView>
                    </Card>
                </LinearGradient>
            </KeyboardAvoidingView>
        );
    }

    AuthScreen.navigationOptions = {
        headerTitle: 'Authenticate',
    };

    const styles = StyleSheet.create({
        screen: {
            flex: 1,
        },
        gradient: {
            flex: 1,
            justifyContent: 'center',
            alignItems: 'center',
        },
        authContainer: {
            width: '80%',
            maxWidth: 400,
            maxHeight: 400,
            padding: 20,
        },
        buttonContainer: {
            marginTop: 10,
        },
    });

    export default AuthScreen;

Auth Config

Go Back to Summary

create auth folder and files redux

    touch store/actions/auth.js store/reducers/auth.js

In store/actions/auth.js

Since we are using redux-thunk to fetch and dispatch our data
redux-thunk give us the dispatch function to dispatch our actions to reducers
and redux-thunk also gives us the getState as a second argument to get the data from our store
Sign Up
- Firebase gives us an link to sign up new users we just have to provide our authentication key
- https://identitytoolkit.googleapis.com/v1/accounts:signInWithPassword?key=${FIREBASE_KEY}

Login

Just like singing up, firebase gives us a link to authenticate users
https://identitytoolkit.googleapis.com/v1/accounts:signInWithPassword?key=${FIREBASE_KEY}

    import { FIREBASE_KEY } from 'react-native-dotenv';
    export const SIGNUP = 'SIGNUP';
    export const LOGIN = 'LOGIN';

    export const signup = (email, password) => {
        return async (dispatch) => {
            try {
                const response = await fetch(
                    `https://identitytoolkit.googleapis.com/v1/accounts:signUp?key=${FIREBASE_KEY}`,
                    {
                        method: 'POST',
                        headers: {
                            'Content-Type': 'application/json',
                        },
                        body: JSON.stringify({
                            email,
                            password,
                            returnSecureToken: true,
                        }),
                    },
                );

                if (!response.ok) {
                    const errorResData = await response.json();
                    const errorId = errorResData.error.message;
                    let message;

                    switch (errorId) {
                        case 'EMAIL_EXISTS':
                            message = 'This email exists already!';

                            break;
                        default:
                            message = 'Something went wrong';

                            break;
                    }

                    throw new Error(message);
                }

                const resData = await response.json();

                dispatch({
                    type: SIGNUP,
                    token: resData.idToken,
                    userId: resData.localId,
                });
            } catch (error) {
                throw error;
            }
        };
    };

    export const login = (email, password) => {
        return async (dispatch) => {
            try {
                const response = await fetch(
                    `https://identitytoolkit.googleapis.com/v1/accounts:signInWithPassword?key=${FIREBASE_KEY}`,
                    {
                        method: 'POST',
                        headers: {
                            'Content-Type': 'application/json',
                        },
                        body: JSON.stringify({
                            email,
                            password,
                            returnSecureToken: true,
                        }),
                    },
                );

                if (!response.ok) {
                    const errorResData = await response.json();
                    const errorId = errorResData.error.message;
                    let message;

                    switch (errorId) {
                        case 'EMAIL_NOT_FOUND':
                            message = 'This email could not be found!';

                            break;
                        case 'INVALID_PASSWORD':
                            message = 'This password is not valid!';
                            break;
                        default:
                            message = 'Something went wrong';

                            break;
                    }

                    throw new Error(message);
                }

                const resData = await response.json();
                dispatch({
                    type: LOGIN,
                    token: resData.idToken,
                    userId: resData.localId,
                });
            } catch (error) {
                throw error;
            }
        };
    };

in store/reducers/auth.js

We get our token and userId that we defined on the login/signup methods in our actions

    import { LOGIN, SIGNUP } from '../actions/auth';

    const initialState = {
        token: null,
        userId: null,
    };

    const authReducer = (state = initialState, action) => {
        switch (action.type) {
            case LOGIN:
                return {
                    token: action.token,
                    userId: action.userId,
                };
            case SIGNUP:
                return {
                    token: action.token,
                    userId: action.userId,
                };
            default:
                return state;
        }
    };

    export default authReducer;

Local Storage - AsyncStorage

Go Back to Summary

In store/actions/auth.js

Import AsyncStorage from react-native
- removeItem('key') to remove key/value from local storage
- setItem('key', 'value') to add key/value pair in the local storage
  - It has to be a string, so we have to JSON.stringify()
- getItem('key') to get an item from local storage

  import { AsyncStorage } from 'react-native';
  import { FIREBASE_KEY } from 'react-native-dotenv';
  export const AUTHENTICATE = 'AUTHENTICATE';
  export const LOGOUT = 'LOGOUT';
  let timer;

  export const authenticate = (userId, token, expiryTime) => {
      return (dispatch) => {
          dispatch(setLogoutTimer(expiryTime));
          dispatch({ type: AUTHENTICATE, userId, token });
      };
  };

  export const signup = (email, password) => {
      return async (dispatch) => {...};
  };

  export const login = (email, password) => {
      return async (dispatch) => {...};
  };

  export const logout = () => {
      clearLogoutTimer();
      AsyncStorage.removeItem('userData');
      return { type: LOGOUT };
  };

  const clearLogoutTimer = () => {
      if (timer) {
          clearTimeout(timer);
      }
  };

  const setLogoutTimer = (expirationTime) => {
      return (dispatch) => {
          timer = setTimeout(() => {
              dispatch(logout());
          }, expirationTime);
      };
  };

  const saveDataToStorage = (token, userId, expirationDate) => {
      AsyncStorage.setItem(
          'userData',
          JSON.stringify({
              token,
              userId,
              expiryDate: expirationDate.toISOString(),
          }),
      );
  };

Great Places App

Packages

Go Back to Summary

Create a new expo app
```
  expo init 5_great_places
```

Install the navigation package and their dependencies

  npm install react-navigation react-navigation-stack react-redux redux redux-thunk
  expo install react-native-gesture-handler react-native-reanimated react-native-screens react-native-safe-area-context @react-native-community/masked-view

  npm i react-navigation-drawer react-navigation-header-buttons @expo/vector-icons

Folder and Files

Go Back to Summary

Create folder and files

  touch env.js
  touch -n components/CustomHeaderButton.js + PlaceItem.js + ImgPicker.js + LocationPicker.js + MapPreview.js
  touch -n css/Colors.js
  touch -n helpers/db.js
  touch -n models/place.js
  touch -n navigation/PlacesNavigator.js
  touch -n screens/PlacesListScreen.js + PlacesDetailScreen.js + NewPlaceScreen.js + MapScreen.js
  touch -n store/places.js

Final structure

  5_Great_Places
  ├─ App.js
  ├─ app.json
  ├─ assets
  │  ├─ icon.png
  │  ├─ places.png
  │  ├─ places-adaptive.png
  │  ├─ splash.png
  │  └─ splash_icon.png
  ├─ babel.config.js
  ├─ components
  │  ├─ CustomHeaderButton.js
  │  ├─ ImgPicker.js
  │  ├─ LocationPicker.js
  │  ├─ MapPreview.js
  │  └─ PlaceItem.js
  ├─ css
  │  └─ Colors.js
  ├─ helpers
  │  └─ db.js
  ├─ env.js
  ├─ models
  │  └─ place.js
  ├─ navigation
  │  └─ PlacesNavigator.js
  ├─ package-lock.json
  ├─ package.json
  ├─ screens
  │  ├─ MapScreen.js
  │  ├─ NewPlaceScreen.js
  │  ├─ PlaceDetailScreen.js
  │  └─ PlacesListScreen.js
  └─ store
    └─ places.js

Components

Go Back to Summary

In the components folder, we are going to create the basic components

Custom Header Button

Go Back to Summary

With the help of HeaderButton from react-navigation-header-buttons, we can create our custom header button, this button is usually the top right button. Because the top left button is commonly used to goBack() to the previous screen

THe HeaderButton accepts the following properties
- IconComponent - we are going to use icons from @expo/vector-icons
- iconSize
- color - in our case we use the Platform from react-native to distinguish between iOS and android, and apply the respective color

  import { Ionicons } from '@expo/vector-icons';
  import React from 'react';
  import { Platform } from 'react-native';
  import { HeaderButton } from 'react-navigation-header-buttons';
  import Colors from '../css/Colors';

  function CustomHeaderButton(props) {
      return (
          <HeaderButton
              {...props}
              IconComponent={Ionicons}
              iconSize={23}
              color={Platform.OS === 'android' ? 'white' : Colors.primary}
          />
      );
  }

  export default CustomHeaderButton;

Place Item

Go Back to Summary

another custom component to display the places

In this component we are receiving from our parent component the following properties/methods
- onSelect
- image
- title
- address

  import React from 'react';
  import { Image, StyleSheet, Text, TouchableOpacity, View } from 'react-native';
  import Colors from '../css/Colors';

  function PlaceItem({ onSelect, image, title, address }) {
      return (
          <TouchableOpacity onPress={onSelect} style={styles.placeItem}>
              <Image style={styles.image} source={{ uri: image }} />
              <View style={styles.infoContainer}>
                  <Text style={styles.title}>{title}</Text>
                  <Text style={styles.address}>{address}</Text>
              </View>
          </TouchableOpacity>
      );
  }

  const styles = StyleSheet.create({
      placeItem: {
          borderBottomColor: '#ccc',
          borderBottomWidth: 1,
          paddingVertical: 15,
          paddingHorizontal: 30,
          flexDirection: 'row',
          alignItems: 'center',
      },
      image: {
          width: 70,
          height: 70,
          borderRadius: 35,
          backgroundColor: '#ccc',
          borderColor: Colors.primary,
          borderWidth: 1,
      },
      infoContainer: {
          marginLeft: 25,
          width: 250,
          justifyContent: 'center',
          alignItems: 'flex-start',
      },
      title: {
          color: 'black',
          fontSize: 18,
          marginBottom: 5,
      },
      address: {
          color: '#666',
          fontSize: 16,
      },
  });

  export default PlaceItem;

CSS

Go Back to Summary

in css/Colors.js
- We named the folder as css but you can name it whatever you want, just remember that this is an object of constants
```
  export default {
      primary: '#fc9208',
  };
```

Models

Go Back to Summary

in models/place.js

We are going to create our place's blueprint using a class

  class Place {
      constructor(id, title, imageUri, address, lat, lng) {
          this.id = id;
          this.title = title;
          this.imageUri = imageUri;
          this.address = address;
          this.lat = lat;
          this.lng = lng;
      }
  }

  export default Place;

Go Back to Summary

in navigation/PlacesNavigator.js

This is our main App, where we can structure all the stacks and default configurations

  import { Platform } from 'react-native';
  import { createAppContainer } from 'react-navigation';
  import { createStackNavigator } from 'react-navigation-stack';
  import Colors from '../css/Colors';
  import MapScreen from '../screens/MapScreen';
  import NewPlaceScreen from '../screens/NewPlaceScreen';
  import PlaceDetailScreen from '../screens/PlaceDetailScreen';
  import PlacesListScreen from '../screens/PlacesListScreen';

  const PlacesNavigator = createStackNavigator(
      {
          Places: PlacesListScreen,
          PlaceDetail: PlaceDetailScreen,
          NewPlace: NewPlaceScreen,
          Map: MapScreen,
      },
      {
          defaultNavigationOptions: {
              headerStyle: {
                  backgroundColor: Platform.OS === 'android' ? Colors.primary : '',
              },
              headerTintColor: Platform.OS === 'android' ? 'white' : Colors.primary,
          },
      },
  );

  export default createAppContainer(PlacesNavigator);

Screens

Go Back to Summary

in the screens' folder, we have all our screens of our app
- MapScreen
- NewPlaceScreen
- PlaceDetailScreen
- PlacesListScreen
all these screens are imported into the PlacesNavigator so we can use in our stackNavigator

Redux / Redux-Thunk

Actions & Reducers

Go Back to Summary

In store/places.js

We have all the actions and reducer related to the place redux

  const ADD_PLACE = 'ADD_PLACE';
  import Place from '../models/place';

  export const addPlace = (title) => {
      return {
          type: ADD_PLACE,
          placeData: {
              title,
          },
      };
  };

  const initialState = {
      places: [],
  };

  const placesReducer = (state = initialState, action) => {
      switch (action.type) {
          case ADD_PLACE:
              const newPlace = new Place(new Date().toString(), action.placeData.title);
              return {
                  places: state.places.concat(newPlace),
              };
          default:
              return state;
      }
  };

  export default placesReducer;

Connect Redux

Go Back to Summary

in App.js

We combine our reducers, create our store, and connect the store with our main app from the navigation folder

  import React from 'react';
  import { Provider } from 'react-redux';
  import { applyMiddleware, combineReducers, createStore } from 'redux';
  import ReduxThunk from 'redux-thunk';
  import PlacesNavigator from './navigation/PlacesNavigator';
  import placesReducer from './store/places';

  const rootReducer = combineReducers({
      places: placesReducer,
  });

  const store = createStore(rootReducer, applyMiddleware(ReduxThunk));

  export default function App() {
      return (
          <Provider store={store}>
              <PlacesNavigator />
          </Provider>
      );
  }

Environment Variables

Go Back to Summary

In our env.js

We are going to export an object with our googleAPiKey

Before exporting, we can create a function to check if we are in development mode or production mode, then return its respective key.

We can do this by checking __DEV__

  const variables = {
      development: {
          googleApiKey: 'AIzaSyDGaD8fasdXLdQ7uUQcfasdf2X3uOU72c8',
      },
      production: {
          googleApiKey: 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
      },
  };

  const getEnvVariables = () => {
      if (__DEV__) {
          return variables.development;
      }
      return variables.production;
  };

  export default getEnvVariables;

Expo - Features

Go Back to Summary

with expo we have access to a bunch of features such as camera, audio, accelerometer.... out of the box
Expo Official Docs

Image Picker

Go Back to Summary

in components/ImgPicker.js
Since our app only cares about the getting the image we can use the
```
  expo install expo-image-picker
```
If we need more control about our camera, then we need to use other package
```
  expo install expo-camera
```

File system

  expo install expo-file-system
  expo install expo-sqlite
  expo install expo-location

Location Picker

Go Back to Summary

in components/LocationPicker.js
To have access to location we need to install another expo package
```
  expo install expo-location
```

in components/LocationPicker.js

This component is similar to our ImagePicker
- We first ask for permission to have access to user's location
- Then with the call .getCurrentPositionAsync() to get the latitude and longitude

  import * as Location from 'expo-location';
  import * as Permissions from 'expo-permissions';
  import React, { useEffect, useState } from 'react';
  import { ActivityIndicator, Button, StyleSheet, Text, View } from 'react-native';
  import Colors from '../css/Colors';
  import MapPreview from './MapPreview';

  function LocationPicker({ navigation, onLocationPicked }) {
      const [isFetching, setIsFetching] = useState(false);
      const [pickedLocation, setPickedLocation] = useState();
      const mapPickedLocation = navigation.getParam('pickedLocation');

      useEffect(() => {
          if (mapPickedLocation) {
              setPickedLocation(mapPickedLocation);
              onLocationPicked(mapPickedLocation);
          }
      }, [mapPickedLocation, onLocationPicked]);

      const verifyPermissions = async () => {
          const result = await Permissions.askAsync(Permissions.LOCATION);
          if (result.status !== 'granted') {
              Alert.alert(
                  'Insufficient permissions!',
                  'You need to grant location permissions to use this app.',
                  [{ text: 'Okay' }],
              );
              return false;
          }
          return true;
      };

      const getLocationHandler = async () => {
          const hasPermission = await verifyPermissions();
          if (!hasPermission) return;

          try {
              setIsFetching(true);
              const location = await Location.getCurrentPositionAsync({
                  timeInterval: 5000,
              });
              setPickedLocation({
                  lat: location.coords.latitude,
                  lng: location.coords.longitude,
              });
              onLocationPicked({
                  lat: location.coords.latitude,
                  lng: location.coords.longitude,
              });
          } catch (error) {
              Alert.alert('Could not fetch location!', 'Please try again later or pick a location on the map', [
                  { text: 'Okay' },
              ]);
          }
          setIsFetching(false);
      };

      const pickOnMapHandler = () => {
          navigation.navigate('Map');
      };

      return (
          <View style={styles.locationPicker}>
              <MapPreview style={styles.mapPreview} location={pickedLocation} onPress={pickOnMapHandler}>
                  {isFetching ? (
                      <ActivityIndicator size="large" color={Colors.primary} />
                  ) : (
                      <Text>No location chosen yet!</Text>
                  )}
              </MapPreview>
              <View style={styles.actions}>
                  <Button title="Get User Location" color={Colors.primary} onPress={getLocationHandler} />
                  <Button title="Pick on Map" color={Colors.primary} onPress={pickOnMapHandler} />
              </View>
          </View>
      );
  }

  const styles = StyleSheet.create({
      locationPicker: {
          marginBottom: 15,
      },
      mapPreview: {
          marginBottom: 10,
          width: '100%',
          height: 150,
          borderColor: '#ccc',
          borderWidth: 1,
      },
      actions: {
          flexDirection: 'row',
          justifyContent: 'space-around',
          width: '100%',
      },
  });

  export default LocationPicker;

in components/ImgPicker.js
we need to import ImagePicker from expo-image-picker, so we can access to extra features such as cropping the image

and Permissions from expo-permissions, for our case we need access to user's camera

To ask the user's permissions, we have a method from expo-permission called .askAsync(), it's an async method and we pass the permissions that we need access
- For iOS we need to to request access to Permissions.CAMERA_ROLL and Permissions.CAMERA
- For android just Permissions.CAMERA_ROLL is enough
With de permission granted, we then can launch the camera launchCameraAsync() from ImagePicker, we can pass an object as argument, in this object we can configure some extra features to edit the image such as allowsEditing, aspect, quality

  import * as ImagePicker from 'expo-image-picker';
  import * as Permissions from 'expo-permissions';
  import React, { useState } from 'react';
  import { Alert, Button, Image, StyleSheet, Text, View } from 'react-native';
  import Colors from '../css/Colors';

  function ImgPicker({ onImageTaken }) {
      const [pickedImage, setPickedImage] = useState();

      const verifyPermissions = async () => {
          const result = await Permissions.askAsync(Permissions.CAMERA_ROLL, Permissions.CAMERA);
          if (result.status !== 'granted') {
              Alert.alert(
                  'Insufficient permissions!',
                  'You need to grant camera permissions to use this app.',
                  [{ text: 'Okay' }],
              );
              return false;
          }
          return true;
      };

      const takeImageHandler = async () => {
          const hasPermission = await verifyPermissions();
          if (!hasPermission) return;
          const image = await ImagePicker.launchCameraAsync({
              allowsEditing: true,
              aspect: [16, 9],
              quality: 0.5,
          });

          setPickedImage(image.uri);
          onImageTaken(image.uri);
      };

      return (
          <View style={styles.imagePicker}>
              <View style={styles.imagePreview}>
                  {!pickedImage ? (
                      <Text>No image picked yet.</Text>
                  ) : (
                      <Image style={styles.image} source={{ uri: pickedImage }} />
                  )}
              </View>
              <Button title="Take Image" color={Colors.primary} onPress={takeImageHandler} />
          </View>
      );
  }

  const styles = StyleSheet.create({
      imagePicker: {
          alignItems: 'center',
      },
      imagePreview: {
          width: '100%',
          height: 200,
          marginBottom: 10,
          justifyContent: 'center',
          alignItems: 'center',
          borderColor: '#ccc',
          borderWidth: 1,
      },
      image: {
          width: '100%',
          height: '100%',
      },
  });

  export default ImgPicker;

Map Preview

Go Back to Summary

in components/MapPreview.js
With the location configured (LocationPicker) we then can configure a preview of the map
First we need to get a google api key from google's api to have access to geo location and map.

To display the map we can use an Image component from react-native

  import React from 'react';
  import { Image, StyleSheet, TouchableOpacity } from 'react-native';
  import ENV from '../env';

  function MapPreview(props) {
      let imagePreviewUrl;

      if (props.location) {
          imagePreviewUrl = `https://maps.googleapis.com/maps/api/staticmap?center=${props.location.lat},${
              props.location.lng
          }&zoom=14&size=400x200&maptype=roadmap&markers=color:red%7Clabel:A%7C${props.location.lat},${
              props.location.lng
          }&key=${ENV().googleApiKey}`;
      }

      return (
          <TouchableOpacity onPress={props.onPress} style={{ ...styles.mapPreview, ...props.style }}>
              {props.location ? (
                  <Image style={styles.mapImage} source={{ uri: imagePreviewUrl }} />
              ) : (
                  props.children
              )}
          </TouchableOpacity>
      );
  }

  const styles = StyleSheet.create({
      mapPreview: {
          justifyContent: 'center',
          alignItems: 'center',
      },
      mapImage: {
          width: '100%',
          height: '100%',
      },
  });

  export default MapPreview;

Local Database - SQLite

Create Database

Go Back to Summary

SQLite is a local database for android/iOS
```
  expo install expo-sqlite
```

in helpers/db.js

import SQLite from expo-sqlite
then open/create the database
- const db = SQLite.openDatabase('places.db');
- if the database doesn't exist, SQLite will create one
after accessing the database
- we then initialize/create our table
SQLite has a method called transaction() that takes a function as an argument which gives us access to the transaction object
- The idea of transaction is to guarantee that our query is executed as a whole, if some part of the query fails, the whole process stops to avoid us ending up with corrupted data. That's why we wrap all of query with the transaction

To insert a new place, SQLite help us to protect our database from attacks (injecting malicious code to run other codes)

  export const insertPlace = (title, imageUri, address, lat, lng) => {
      const promise = new Promise((resolve, reject) => {
          db.transaction((tx) => {
              tx.executeSql(
                  `INSERT INTO places (title, imageUri, address, lat, lng) VALUES (?, ?, ?, ?, ?)`,
                  [title, imageUri, address, lat, lng],
                  (_, data) => {
                      resolve(data);
                  },
                  (_, error) => {
                      reject(error);
                  },
              );
          });
      });

      return promise;
  };

We just replace the values with ?, and then we pass the values for each ? as and array. The sequel package will validate the information before injecting into the ?
And then the the last parameter is the callback where
- the first argument is the repetitions of the query _
- the second argument is the data

  import * as SQLite from 'expo-sqlite';

  const db = SQLite.openDatabase('places.db');

  export const init = () => {
      const promise = new Promise((resolve, reject) => {
          db.transaction((tx) => {
              tx.executeSql(
                  'CREATE TABLE IF NOT EXISTS places (id INTEGER PRIMARY KEY NOT NULL, title TEXT NOT NULL, imageUri TEXT NOT NULL, address TEXT NOT NULL, lat REAL NOT NULL, lng REAL NOT NULL);',
                  [],
                  () => {
                      resolve();
                  },
                  (_, error) => {
                      reject(error);
                  },
              );
          });
      });

      return promise;
  };

  export const insertPlace = (title, imageUri, address, lat, lng) => {
      const promise = new Promise((resolve, reject) => {
          db.transaction((tx) => {
              tx.executeSql(
                  `INSERT INTO places (title, imageUri, address, lat, lng) VALUES (?, ?, ?, ?, ?)`,
                  [title, imageUri, address, lat, lng],
                  (_, data) => {
                      resolve(data);
                  },
                  (_, error) => {
                      reject(error);
                  },
              );
          });
      });

      return promise;
  };

  export const fetchPlaces = () => {
      const promise = new Promise((resolve, reject) => {
          db.transaction((tx) => {
              tx.executeSql(
                  `SELECT * FROM places`,
                  [],
                  (_, data) => {
                      resolve(data);
                  },
                  (_, error) => {
                      reject(error);
                  },
              );
          });
      });

      return promise;
  };

Initialize Database - App.js

Go Back to Summary

  import React from 'react';
  import { Provider } from 'react-redux';
  import { applyMiddleware, combineReducers, createStore } from 'redux';
  import ReduxThunk from 'redux-thunk';
  import { init } from './helpers/db';
  import PlacesNavigator from './navigation/PlacesNavigator';
  import placesReducer from './store/places';

  init()
      .then(() => {
          console.log('Initializing database');
      })
      .catch((error) => {
          console.log('Initializing database failed');
          console.log(error);
      });

  const rootReducer = combineReducers({
      places: placesReducer,
  });

  const store = createStore(rootReducer, applyMiddleware(ReduxThunk));

  export default function App() {
      return (
          <Provider store={store}>
              <PlacesNavigator />
          </Provider>
      );
  }

Update Redux

Go Back to Summary

Update our redux store to use our local database to fetch or add new places

  const ADD_PLACE = 'ADD_PLACE';
  const SET_PLACES = 'SET_PLACES';
  import * as FileSystem from 'expo-file-system';
  import ENV from '../env';
  import { fetchPlaces, insertPlace } from '../helpers/db';
  import Place from '../models/place';

  export const loadPlaces = () => {
      try {
          return async (dispatch) => {
              const dbResult = await fetchPlaces();

              dispatch({
                  type: SET_PLACES,
                  places: dbResult.rows._array,
              });
          };
      } catch (error) {
          console.log(error);
          throw error;
      }
  };

  export const addPlace = (title, imageUri, location) => {
      return async (dispatch) => {
          const response = await fetch(
              `https://maps.googleapis.com/maps/api/geocode/json?latlng=${location.lat},${location.lng}&key=${
                  ENV().googleApiKey
              }`,
          );

          if (!response.ok) {
              throw new Error('Something went wrong');
          }

          const resData = await response.json();

          if (!resData.results) {
              throw new Error('Something went wrong');
          }

          const address = resData.results[0].formatted_address;
          const fileName = imageUri.split('/').pop();
          const newPath = FileSystem.documentDirectory + fileName;

          try {
              await FileSystem.moveAsync({
                  from: imageUri,
                  to: newPath,
              });

              const dbResult = await insertPlace(title, newPath, address, location.lat, location.lng);

              dispatch({
                  type: ADD_PLACE,
                  placeData: {
                      id: dbResult.insertId,
                      title,
                      imageUri: newPath,
                      address,
                      coords: {
                          lat: location.lat,
                          lng: location.lng,
                      },
                  },
              });
          } catch (error) {
              console.log(error);
              throw error;
          }
      };
  };

  const initialState = {
      places: [],
  };

  const placesReducer = (state = initialState, action) => {
      switch (action.type) {
          case SET_PLACES:
              return {
                  places: action.places.map(
                      (place) =>
                          new Place(
                              place.id.toString(),
                              place.title,
                              place.imageUri,
                              place.address,
                              place.lat,
                              place.lng,
                          ),
                  ),
              };
          case ADD_PLACE:
              const newPlace = new Place(
                  action.placeData.id.toString(),
                  action.placeData.title,
                  action.placeData.imageUri,
                  action.placeData.address,
                  action.placeData.coords.lat,
                  action.placeData.coords.lng,
              );
              return {
                  places: state.places.concat(newPlace),
              };
          default:
              return state;
      }
  };

  export default placesReducer;

Name		Name	Last commit message	Last commit date
Latest commit History 31 Commits
1_Basics_React_Native		1_Basics_React_Native
2_Game_Guess_Number		2_Game_Guess_Number
3_Meals_App		3_Meals_App
4_Shop_App		4_Shop_App
5_Great_Places		5_Great_Places
LICENSE		LICENSE
README.md		README.md

License

Roger-Takeshita/React_Native

Folders and files

Latest commit

History

Repository files navigation

Summary

Start a New Project

Third-party Library - Navigation

Packages

Create Folders and Files

Start Build Our App

App.js

Meals Navigation

CategoriesScreen.js

Shop App

Packages

Folder and Files

Constants - Global "CSS"

Models - Schema

Database - Dummy Data

React Redux

Reducers

Create Redux Store

Screens - ProductsOverviewScreen

Shop Navigator

Redux Thunk

Package

Config Redux Thunk

Config - App.js

Use Redux Thunk - Actions

Authentication

When The App Launches

Authentication Screen

Auth Config

Local Storage - AsyncStorage

Great Places App

Packages

Folder and Files

Components

Custom Header Button

Place Item

CSS

Models

Navigation

Screens

Redux / Redux-Thunk

Actions & Reducers

Connect Redux

Environment Variables

Expo - Features

Image Picker

Location Picker

Map Preview

Local Database - SQLite

Create Database

Initialize Database - App.js

Update Redux

About

Topics

Resources

License

Stars

Watchers

Forks

Releases

Packages 0

Languages

Packages