React Native Dimensions – To Get Device Height Width in React Native

React Native Dimensions

Here is an Example to Get Device Height Width on Button Click in React Native. We will use Dimensions component of react-native to get the Height and Width of the Device.

In mobile app development, we have to support different screens sizes. Especially if you are working on an App where responsiveness matters a lot then you need to keep track of Device Height and Width. So Let’s get started with the example to get the Device Height Width.

Import Dimensions

import { Dimensions} from 'react-native'

To Get the Height of the Device

Dimensions.get('window').height

To Get the Width of the Device

Dimensions.get('window').width

In this example, We will get the device height and width on a click of a button.

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 How to get device height and width*/
import React, { Component } from 'react';
//import react in our project
import { AppRegistry, StyleSheet, Text, View, Button, Dimensions, Alert,} from 'react-native';
//import all the componnt we needed
export default class App extends Component {
  GetHeight = () => {
    //handler to get device Height
    const Height = Dimensions.get('window').height;
    //Here is the height of the device
    Alert.alert('Device Height: ' + Height);
  };
  GetWidth = () => {
    //handler to get device Width
    const Width = Dimensions.get('window').width;
    //Here is the Width of the device
    Alert.alert('Device Width: ' + Width);
  };
  render() {
    return (
      <View style={styles.MainContainer}>
        <View style={styles.ButtonStyle}>
          <Button
            title="Click Here To Show Device Height"
            onPress={this.GetHeight}
          />
        </View>
        <View style={styles.ButtonStyle}>
          <Button
            title="Click Here To Show Device Width"
            onPress={this.GetWidth}
          />
        </View>
      </View>
    );
  }
}
const styles = StyleSheet.create({
  MainContainer: {
    flex: 1,
    justifyContent: 'center',
    backgroundColor: '#FFFFFF',
    margin: 10,
  },
  ButtonStyle: {
    margin: 10,
  },
});

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 Screenshot

IOS

          

Android

          

Output in Online Emulator

That was the way to get device height width on button click. If you have any doubts or you want to share something about the topic you can comment below or contact us here. The remaining components will be covered in the next article. Stay tuned!

Hope you liked it. 🙂


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