使用纯JavaScript将React-Native（Expo）应用发送到Android后退按钮按下的背景吗？

Question

I'd like to have the Android back button send the app to the background using pure JavaScript, but the only solutions I've been able to find require changes in Java and I'm trying to avoid ejecting from Expo just yet.

Is there a way to send an app to the background rather than exiting it.

Answer 1

Here is snack example. https://snack.expo.io/@nazrdogan/carefree-beef-jerky When you return false from Backhandler app will go background. if return true you can do your own logic.

 import * as React from 'react'; import { Text, View, StyleSheet, BackHandler } from 'react-native'; import { Constants } from 'expo'; // You can import from local files import AssetExample from './components/AssetExample'; // or any pure javascript modules available in npm import { Card, Button } from 'react-native-paper'; export default class App extends React.Component { componentDidMount() { BackHandler.addEventListener('hardwareBackPress', this.handleBackPress); } componentWillUnmount() { BackHandler.removeEventListener('hardwareBackPress', this.handleBackPress); } handleBackPress = () => { //if you return false. it will goes background return false; }; render() { return ( <View style={styles.container}> <Text>Test</Text> </View> ); } } const styles = StyleSheet.create({ container: { flex: 1, justifyContent: 'center', paddingTop: Constants.statusBarHeight, backgroundColor: '#ecf0f1', padding: 8, }, });