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Detect network connection changes in react native
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| import React, { useEffect, useState } from 'react'; | |
| import { StyleSheet, View, Text, Alert } from 'react-native'; | |
| import NetInfo from '@react-native-community/netinfo' | |
| let cellularGeneration='' | |
| let signalStrength=100 | |
| let connectionType='' | |
| const NetworkConnectionChange=()=>{ | |
| const [isNetworkConnected, setIsNetworkConnected] = useState(true) | |
| const [showNetworkConnectionMessage, setShowNetworkConnectionMessage] = useState(false) | |
| useEffect(() => { | |
| let connectionDetails | |
| const unsubscribe = NetInfo.addEventListener(state => { | |
| if (state.isConnected) { | |
| setIsNetworkConnected(true); | |
| } else { | |
| setIsNetworkConnected(false); | |
| } | |
| connectionDetails=state.details | |
| connectionType=state.type | |
| if(connectionType=='cellular'){ | |
| cellularGeneration=connectionDetails.cellularGeneration | |
| } else if(connectionType=='wifi'){ | |
| signalStrength=connectionDetails.strength | |
| } | |
| }); | |
| return () => { | |
| unsubscribe() | |
| } | |
| }, [isNetworkConnected]); | |
| const isSlowNetworkConnection=()=>{ | |
| if((connectionType=='wifi' && signalStrength<50) || (connectionType=='cellular' && cellularGeneration=='2g')){ | |
| return true | |
| }else{ | |
| return false | |
| } | |
| } | |
| useEffect(() => { | |
| let timer | |
| if (isNetworkConnected) { | |
| timer = setTimeout(() => { | |
| setShowNetworkConnectionMessage(false) | |
| }, 2000); | |
| } else { | |
| setShowNetworkConnectionMessage(true) | |
| } | |
| return () => clearTimeout(timer); | |
| }, [isNetworkConnected]); | |
| const getNetworkConnectionStyle = () => { | |
| if (isNetworkConnected) { | |
| return { | |
| padding:5, | |
| width: '100%', | |
| fontSize: 14, | |
| color: '#ffffff', | |
| justifyContent: 'center', | |
| alignSelf: 'center', | |
| backgroundColor: 'green', | |
| textAlign: 'center' | |
| } | |
| } else { | |
| return { | |
| padding: 5, | |
| width: '100%', | |
| fontSize:14, | |
| color: '#ffffff', | |
| justifyContent: 'center', | |
| alignSelf: 'center', | |
| backgroundColor: 'red, | |
| textAlign: 'center' | |
| } | |
| } | |
| } | |
| const getNetworkStatusText = () => { | |
| if (isNetworkConnected) { | |
| return 'Back Online' | |
| } else { | |
| return 'No Connection' | |
| } | |
| } | |
| return ( | |
| <View style={{ flex: 1 }}> | |
| {showNetworkConnectionMessage && <Text style={getNetworkConnectionStyle()}>{getNetworkStatusText()}</Text>} | |
| {isNetworkConnected && isSlowNetworkConnection() && <Text style={styles.slowConnection}>You have slow network connection</Text>} | |
| <View> | |
| ) | |
| } | |
| const styles = StyleSheet.create({ | |
| slowConnection:{ | |
| padding: 5, | |
| width: '100%', | |
| fontSize: 14, | |
| color: '#ffffff', | |
| justifyContent: 'center', | |
| alignSelf: 'center', | |
| backgroundColor: 'blue', | |
| textAlign: 'center' | |
| } | |
| }); |
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