Example of GridView using FlatList in React Native

GridView has the same popularity as Listview, both are used to arrange the items in a proper manner. So here is the Example of GridView using FlatList in React Native.

GridView can be used when we have to make a View Group that displays items in a two-dimensional, scrollable grid. The most usable example of the Grid is the image gallery where we have to showcase all the images. In this example, we will use FlatList to make our GridView.  React Native FlatList is a simple list. It is among the simple but mostly used components.

To Import FlatList in Code

import { FlatList} from 'react-native'

Render Using

<FlatList
  data={this.state.dataSource}
  renderItem={({ item }) => (
    <View style={{ flex: 1, flexDirection: 'column', margin: 1 }}>
      <Image style={styles.imageThumbnail} source={{ uri: item.src }} />
    </View>
  )}
  //Setting the number of column
  numColumns={3}
  keyExtractor={(item, index) => index.toString()}
/>

In this example of GridView, we will make a simple image gallery to showcase the images in the GridView. 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 init to make our React Native App. Assuming that you have node installed, you can use npm to install the react-native-cli command line utility. Open the terminal and go to the workspace and run

npm install -g react-native-cli

Run the following commands to create a new React Native project

react-native init ProjectName

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

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

react-native init ProjectName --version react-native@next

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

/*This is an Example of Grid View in React Native*/
import React, { Component } from 'react';
//import rect in our project
import {
  StyleSheet,
  View,
  FlatList,
  ActivityIndicator,
  Image,
  TouchableOpacity,
} from 'react-native';
//import all the components we will need

export default class App extends Component {
  constructor() {
    super();
    this.state = {
      dataSource: {},
    };
  }
  componentDidMount() {
    var that = this;
    let items = Array.apply(null, Array(60)).map((v, i) => {
      return { id: i, src: 'http://placehold.it/200x200?text=' + (i + 1) };
    });
    that.setState({
      dataSource: items,
    });
  }
  render() {
    return (
      <View style={styles.MainContainer}>
        <FlatList
          data={this.state.dataSource}
          renderItem={({ item }) => (
            <View style={{ flex: 1, flexDirection: 'column', margin: 1 }}>
              <Image style={styles.imageThumbnail} source={{ uri: item.src }} />
            </View>
          )}
          //Setting the number of column
          numColumns={3}
          keyExtractor={(item, index) => index.toString()}
        />
      </View>
    );
  }
}

const styles = StyleSheet.create({
  MainContainer: {
    justifyContent: 'center',
    flex: 1,
    paddingTop: 30,
  },
  imageThumbnail: {
    justifyContent: 'center',
    alignItems: 'center',
    height: 100,
  },
});

To Run the React Native App

Open the terminal again and jump into your project using.

cd ProjectName

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

react-native run-android

or on the iOS Simulator by running

react-native run-ios (macOS only).

Output Screenshots

IOS

Android

Output in Online Emulator

That was React Native GridView using FlatList. 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. 🙂