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How to detect screen lock set or not in react native

Infinitbility
React Native
August 27th, 2021 · 1 min read
How to detect screen lock set or not in react native

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This tutorial will help you to detect screen lock ( pin, password, pattern, and fingerprint ) set or not in device, here we will use react-native-device-info ( https://github.com/react-native-device-info/react-native-device-info ) for detection of screen lock.

Introduction

React Native device info provide isPinOrFingerprintSet() function to detect pin, password, pattern, and fingerprint lock set or not it will return only true or false. isPinOrFingerprintSet() function work in ios, android, and windows platform.

Installation

  • Go to your project directory and install react-native-device-info package using npm.
1npm install --save react-native-device-info
  • Link react-native-device-info package if your react native version less then 0.63.
1npx react-native link react-native-device-info

Syntax

DeviceInfo.isPinOrFingerprintSet() function usages syntax.

1import DeviceInfo from 'react-native-device-info';
2
3
4DeviceInfo.isPinOrFingerprintSet().then((isPinOrFingerprintSet) => {
5 if (!isPinOrFingerprintSet) {
6 // ...
7 }
8});

Example

In Below Example, we will isPinOrFingerprintSet() value on constant and show in application.

React Native Device Info isPinOrFingerprintSet example

1import React, { Component } from 'react';
2import {
3 StyleSheet,
4 View,
5 Text,
6 SafeAreaView,
7} from 'react-native';
8import DeviceInfo from 'react-native-device-info';
9
10class App extends Component {
11
12 constructor(props) {
13 super(props);
14
15 this.state = {
16 passwordLock: false
17 }
18 }
19
20
21 componentDidMount(){
22 DeviceInfo.isPinOrFingerprintSet().then((isPinOrFingerprintSet) => {
23 if (isPinOrFingerprintSet) {
24 this.setState({passwordLock: true});
25 }
26 });
27 }
28
29
30
31 render() {
32 const { passwordLock } = this.state;
33 return (
34 <SafeAreaView style={{ flex: 1 }}>
35 <View style={styles.container}>
36 <Text>Device have password lock</Text>
37 <Text>{`${passwordLock}`}</Text>
38 </View>
39 </SafeAreaView>
40 );
41 }
42}
43
44const styles = StyleSheet.create({
45 container: {
46 flex: 1,
47 alignItems: 'center',
48 marginTop: 20,
49 backgroundColor: '#ffffff',
50 },
51});
52
53export default App;

Output

React Native, DeviceInfo, isPinOrFingerprintSet, Example

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