Discover React Native for creating rich, cross-platform mobile apps with reusable components. Gain insights into UI components, styling, navigation, Hooks, state, and database management.

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reactNative

React Native is a well-known mobile application development framework that allows developers to create rich, cross-platform mobile application UI using reusable components. It's ideal for building mobile applications and supports multi-platform reusable code, pre-built components, and a rich UI. Most well-known social media platforms, such as Facebook and Instagram, have been built using React Native. 

In this course, you’ll start with a brief introduction to React Native and then cover various built-in components of React Native categorized into different categories such as basic, user interface, user interaction, and list view components. Next, you’ll learn about concepts such as application styling, navigation, Hooks, state management, and database management. You’ll find interactive quizzes and challenges throughout the course to test your understanding.

By the end of this course, you’ll be able to develop mobile applications and kickstart your journey as a React Native developer.

Getting Started with Mobile App Development with React Native

The Android widget below contains the solution to the challenge. We will also go through a step-by-step explanation of the solution.

> **Note:** Press the "Run" button on the Android widget below to execute the program. Wait for the program to compile inside the "Terminal" tab of the widget, and then switch to the "Output" tab once the program has been successfully compiled.

# Solution

import React from 'react';
import { SafeAreaView, 
  View, 
  Text, 
  Image, 
  StyleSheet, 
  TextInput, 
  ScrollView,
  Alert
} from 'react-native';

const cLogo = require('./assets/languages/c.png')
const c_plus_plusLogo = require('./assets/languages/c_plus_plus.png')
const elixirLogo = require('./assets/languages/elixir.png')
const javaLogo = require('./assets/languages/java.png')
const javascriptLogo = require('./assets/languages/javascript.png')
const pythonLogo = require('./assets/languages/python.png')

const App = () => {

  const [language, setLanguage] = React.useState("");

  const checkLanguage = () => {
    if (language == "c" || language == "c++" || language == "elixir" || language == "java" 
      || language == "javascript" || language == "python") 
    {
      Alert.alert("That's a great choice!")
    } else if (language == "") {
      Alert.alert("Text input is empty!")
    } else {
      Alert.alert("Invalid choice. Available languages are C, C++, Elixir, Java, JavaScript, and Python")
    }
  }

  const updateLanguage = (text) => {
    setLanguage(text.toLowerCase());
  }

  return (
    <ScrollView>
      <SafeAreaView style={styles.container}>
        <Text style={styles.text}> Programming Languages </Text>
        <ScrollView 
          contentContainerStyle={styles.scrollStyle}
          horizontal={true}
        >
          <View style={styles.box}>
            <Image style={styles.image} source={ cLogo } />
          </View>

          <View style={styles.box}>
            <Image style={styles.image} source={ c_plus_plusLogo } />
          </View>

          <View style={styles.box}>
            <Image style={styles.image} source={ elixirLogo } />
          </View>

          <View style={styles.box}>
            <Image style={styles.image} source={ javaLogo } />
          </View>

          <View style={styles.box}>
            <Image style={styles.image} source={ javascriptLogo } />
          </View>

          <View style={styles.box}>
            <Image style={styles.image} source={ pythonLogo } />
          </View>
      </ScrollView>
      <TextInput 
        style={styles.textInputStyle}
        placeholder="What is your favorite programming language from the list above?"
        placeholderTextColor="black"
        multiline={ true }
        onChangeText={ text => updateLanguage(text) }
        onSubmitEditing={ () => checkLanguage() }
      />
      </SafeAreaView>
    </ScrollView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: "center"
  },
  box: {
    borderWidth: 3,
    width: 380,
    height: 380,
    alignItems: "center",
    justifyContent: "center",
    marginRight: 20,
    marginLeft: 20,
    marginTop: 15,
    backgroundColor: "#DCAB6B"
  },
  scrollStyle: {
    alignItems: "center",
    justifyContent: "center",
    marginBottom: 15
  },
  text: {
    fontFamily: "monospace",
    fontSize: 30,
    fontWeight: "600",
    marginTop: 170,
    marginBottom: 20
  },
  image: {
    height: 300,
    width: 300,
    resizeMode: "stretch"
  },
  textInputStyle: {
    height: 75,
    width: 540,
    borderWidth: 2,
    borderRadius: 20,
    paddingLeft: 20,
    paddingRight: 20,
    marginBottom: 230,
    marginTop: 40,
    fontSize: 23,
  }
});

export default App;

{
  "name": "reactnativeapp",
  "displayName": "reactnativeapp"
}

module.exports = {
  presets: ['module:metro-react-native-babel-preset'],
};


/**
 * @format
 */

import {AppRegistry} from 'react-native';
import App from './App';
import {name as appName} from './app.json';

AppRegistry.registerComponent(appName, () => App);


/**
 * Metro configuration for React Native
 * https://github.com/facebook/react-native
 *
 * @format
 */

module.exports = {
  transformer: {
    getTransformOptions: async () => ({
      transform: {
        experimentalImportSupport: false,
        inlineRequires: true,
      },
    }),
  },
};


In the solution code provided above:

- **Lines 12–17:** We import the required images from assets.

- **Line 41:** We add the `SafeAreaView` component. The corresponding closing tag is placed in **line 79**. We add the styles for the `SafeAreaView` component using the `StyleSheet` at **lines 84–87**.

- **Line 42:** We add the `Text` component. We add the styles for the `Text` component using the `StyleSheet` at **lines 104–110**.

- **Lines 43–46:** We add the `ScrollView` component. The corresponding closing tag is placed in **line 70**. We add the styles for the `ScrollView` component using the `StyleSheet` at **lines 99–103**. We also set the `horizontal` prop to `true` to enable horizontal scrolling.

- **Lines 47–69:** We use the `Image` components for nesting the six images inside the `View` components. We add the styles for the `View` and `Image` components using the `StyleSheet` at **lines 88–98** and **lines 111–115**, respectively.

- **Lines 71–77:** We add the `TextInput` component. We add the styles for the `TextInput` component using the `StyleSheet` at **lines 116–126**. We also set the following props inside the `TextInput` component:
  - `placeholder="What is your favorite programming language from the list above?"`
  - `placeholderTextColor="black"`
  - `onChangeText={ text => updateLanguage(text) }`
  - `onSubmitEditing={ () => checkLanguage() }`

Get a detailed review of the solution to the challenge.

Before We Begin

Introduction to React Native

Basic Components

User Interface and User Interaction

List View

Android Components and APIs

Miscellaneous Components and APIs

Application Styling

Navigation

Hooks

State Management

Database Management

Appendix

Solution Review: Favorite Programming Language