React Native NetInfo exposes info about online/offline status which is very helpful when you are making an application that only works in online mode. This will be helpful to alert your App users about the internet connection while using your app.
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 thereact-native-cli command line utility. Open the terminal and go to the workspace and runOpen App.js in any code editor and replace the code with the following code.
App.js
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | //This is an example code for Net Info// import React, { Component } from 'react'; //import react in our code. import { AppState, Text, NetInfo } from 'react-native'; //import all the components we are going to use. export default class App extends Component { state = { appState: AppState.currentState, }; componentDidMount() { NetInfo.getConnectionInfo().then((connectionInfo) => { console.log( 'Initial, type: ' + connectionInfo.type + ', effectiveType: ' + connectionInfo.effectiveType); }); NetInfo.addEventListener( 'connectionChange', this.handleFirstConnectivityChange ); } handleFirstConnectivityChange(connectionInfo) { console.log('First change, type: ' + connectionInfo.type + ', effectiveType: ' + connectionInfo.effectiveType); } render() { return ( <Text style={{ marginTop: 30, padding: 20 }}> NetInfo Example. Please open debugger to see the log </Text> ); } } |
Permission to Access Network State and other configurations for Android
We are accessing the network state so we need to add some permission in AndroidManifest.xml file (For Android) after ejecting the project from expo environment. On devices before SDK version API 23, the permissions are automatically granted if they appear in the manifest but after SDK version 23 android applies new permissions model. For more about the permission, you can see React Native Android Permission.
So we are adding going to add the following permission in the AndroidMnifest.xml
1 | <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> |
By adding permission in AndroidManifest.xml you are able to access ACCESS_NETWORK_STATE of your devices.
To Run the React Native App
Open the terminal again and jump into your project using.
That was the React Native NetInfo. If you have any doubt 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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