React Native Collapsible Toolbar with Animation

React Native Collapsible Toolbar

Here is an example of React Native Collapsible Toolbar with Animation. It was first introduced in Android Material Design and became very popular. In Collapsible Toolbar when screen renders for the first time we got the broad header which will help us to get the attention of the user on important details. As the user scrolls up header goes up with the screen and collapses itself because this time the focus of the user is on the data below the header and again when the user pulls the screen down it expands and becomes broad again.

In this example of Collapsible Toolbar, we are using Animated a React Native component which helps us to manage our toolbar. So let’s get started.

To Make a React Native App

Getting started with React Native will help you to know more about the way you can make a React Native project. We are going to use react native command line interface to make our React Native App.

If you have previously installed a global react-native-cli package, please remove it as it may cause unexpected issues:

npm uninstall -g react-native-cli @react-native-community/cli

Run the following commands to create a new React Native project

npx react-native init ProjectName

If you want to start a new project with a specific React Native version, you can use the --version argument:

npx react-native init ProjectName --version X.XX.X

Note If the above command is failing, you may have old version of react-native or react-native-cli installed globally on your pc. Try uninstalling the cli and run the cli using npx.

This will make a project structure with an index file named App.js in your project directory.

Code

Open App.js in any code editor and replace the code with the following code.

App.js

// React Native Collapsible Toolbar with Animation
// https://aboutreact.com/react-native-collapsible-toolbar/

// import React in our code
import React from 'react';

// import all the components we are going to use
import {
  SafeAreaView,
  ScrollView,
  StyleSheet,
  View,
  Animated,
  Text,
} from 'react-native';

const App = () => {
  const dummyData = [
    'Text',
    'Input',
    'Button',
    'Card',
    'CheckBox',
    'Divider',
    'Header',
    'List Item',
    'Pricing',
    'Rating',
    'Search Bar',
    'Slider',
    'Tile',
    'Icon',
    'Avatar',
  ];
  let AnimatedHeaderValue = new Animated.Value(0);
  const Header_Maximum_Height = 150;
  //Max Height of the Header
  const Header_Minimum_Height = 50;
  //Min Height of the Header

  const animateHeaderBackgroundColor =
    AnimatedHeaderValue.interpolate({
      inputRange: [0, Header_Maximum_Height],
      outputRange: ['#4286F4', '#00BCD4'],
      extrapolate: 'clamp',
    });

  const animateHeaderHeight =
    AnimatedHeaderValue.interpolate({
      inputRange: [0, Header_Maximum_Height],
      outputRange: [Header_Maximum_Height, Header_Minimum_Height],
      extrapolate: 'clamp',
    });

  return (
    <SafeAreaView style={styles.container}>
      <View style={styles.container}>
        <Animated.View
          style={[
            styles.header,
            {
              height: animateHeaderHeight,
              backgroundColor: animateHeaderBackgroundColor,
            },
          ]}>
          <Text style={styles.headerText}>
            React Native Collapsible Toolbar with Animation
          </Text>
        </Animated.View>
        <ScrollView
          scrollEventThrottle={16}
          onScroll={Animated.event(
            [{
              nativeEvent: {
                contentOffset: { y: AnimatedHeaderValue }
              }
            }],
            { useNativeDriver: false }
          )}>
          {/* Put all your Component here inside the ScrollView */}
          {dummyData.map((item, index) => (
            <Text style={styles.textStyle} key={index}>
              {item}
            </Text>
          ))}
        </ScrollView>
      </View>
    </SafeAreaView>
  );
};

export default App;

const styles = StyleSheet.create({
  container: {
    flex: 1,
  },
  header: {
    justifyContent: 'center',
    alignItems: 'center',
    left: 0,
    right: 0,
  },
  headerText: {
    color: '#fff',
    fontSize: 18,
    textAlign: 'center',
  },
  textStyle: {
    textAlign: 'center',
    color: '#000',
    fontSize: 18,
    padding: 20,
  },
});

To Run the React Native App

Open the terminal again and jump into your project using.

cd ProjectName

1. Start Metro Bundler

First, you will need to start Metro, the JavaScript bundler that ships with React Native. To start Metro bundler run following command:

npx react-native start

Once you start Metro Bundler it will run forever on your terminal until you close it. Let Metro Bundler run in its own terminal. Open a new terminal and run the application.

2. Start React Native Application

To run the project on an Android Virtual Device or on real debugging device:

npx react-native run-android

or on the iOS Simulator by running (macOS only)

npx react-native run-ios

Output Screenshots

Output in Online Emulator

That was the React Native Collapsible Toolbar with Animation. If you have any doubts or you want to share something about the topic you can comment below or contact us here. There will be more posts coming soon. Stay tuned!

Hope you liked it. 🙂