React Native AppState – Active | Background | Inactive

React Native AppState

This is an example to Get Application State using AppState in React Native. React Native AppState helps you to know the currents state of the application. It will give you the information that the application is in the foreground or in the background, and will notify you on the change of state. AppState is frequently used to determine the intent and proper behavior when handling push notifications.

Different App States

React Native AppState will provide you the following different App states:

  • active – The app is running in the foreground
  • background – The app is running in the background. The user is either:
    • using another app
    • on the home screen
    • [Android] on another Activity (even if it was launched by your app)
  • inactive – This is a state that occurs when transitioning between foreground & background, and during periods of inactivity such as entering the Multitasking view or in the event of an incoming call

To Import AppState in Code

import { AppState} from 'react-native'

To add AppState Listener

AppState.addEventListener('change', this._handleAppStateChange);

In this Example, we will see how to know the application status using the AppState. 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 code for AppState// 
import React, { Component } from 'react';
//import react in our code.
import { AppState, Text } from 'react-native';
//import all the components we are going to use. 
export default class App extends Component {
  state = {
    appState: AppState.currentState,
  };
  componentDidMount() {
    AppState.addEventListener('change', this._handleAppStateChange);
  }
  componentWillUnmount() {
    AppState.removeEventListener('change', this._handleAppStateChange);
  }
  _handleAppStateChange = nextAppState => {
    if (this.state.appState.match(/inactive|background/) && nextAppState === 'active') {
      console.log('App State: ' + 'App has come to the foreground!');
      alert('App State: ' + 'App has come to the foreground!');
    }
    console.log('App State: ' + nextAppState);
    alert('App State: ' + nextAppState);
    this.setState({ appState: nextAppState });
  };
  render() {
    return (
      <Text style={{flex:1, marginTop: 30, padding: 20, backgroundColor:'white'}}>
        Current state is: {this.state.appState}
      </Text>
    );
  }
}

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

Android

      



IOS

            

Output in Online Emulator

That was the React Native AppState. 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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