How to use backHandler method in root

Best JavaScript code snippet using root

BackAndroid.js

Source:BackAndroid.js

1/**2 * Copyright (c) 2015-present, Facebook, Inc.3 * All rights reserved.4 *5 * This source code is licensed under the BSD-style license found in the6 * LICENSE file in the root directory of this source tree. An additional grant7 * of patent rights can be found in the PATENTS file in the same directory.8 *9 * BackAndroid has been moved to BackHandler.  This stub calls BackHandler methods10 * after generating a warning to remind users to move to the new BackHandler module.11 *12 * @providesModule BackAndroid13 */14'use strict';15var BackHandler = require('BackHandler');16var warning = require('fbjs/lib/warning');17/**18 * Deprecated.  Use BackHandler instead.19 */20var BackAndroid = {21  exitApp: function() {22    warning(false, 'BackAndroid is deprecated.  Please use BackHandler instead.');23    BackHandler.exitApp();24  },25  addEventListener: function (26    eventName: BackPressEventName,27    handler: Function28  ): {remove: () => void} {29    warning(false, 'BackAndroid is deprecated.  Please use BackHandler instead.');30    return BackHandler.addEventListener(eventName, handler);31  },32  removeEventListener: function(33    eventName: BackPressEventName,34    handler: Function35  ): void {36    warning(false, 'BackAndroid is deprecated.  Please use BackHandler instead.');37    BackHandler.removeEventListener(eventName, handler);38  },39};...

Using AI Code Generation

1import { BackHandler } from 'react-native';2componentDidMount() {3  BackHandler.addEventListener('hardwareBackPress', this.handleBackPress);4}5componentWillUnmount() {6  BackHandler.removeEventListener('hardwareBackPress', this.handleBackPress);7}8handleBackPress = () => {9  return true;10}11import { BackHandler } from 'react-native';12componentDidMount() {13  BackHandler.addEventListener('hardwareBackPress', this.handleBackPress);14}15componentWillUnmount() {16  BackHandler.removeEventListener('hardwareBackPress', this.handleBackPress);17}18handleBackPress = () => {19  return true;20}21import { BackHandler } from 'react-native';22componentDidMount() {23  BackHandler.addEventListener('hardwareBackPress', this.handleBackPress);24}25componentWillUnmount() {26  BackHandler.removeEventListener('hardwareBackPress', this.handleBackPress);27}28handleBackPress = () => {29  return true;30}31import { BackHandler } from 'react-native';32componentDidMount() {33  BackHandler.addEventListener('hardwareBackPress', this.handleBackPress);34}35componentWillUnmount() {36  BackHandler.removeEventListener('hardwareBackPress', this.handleBackPress);37}38handleBackPress = () => {39  return true;40}41import { BackHandler } from 'react-native';42componentDidMount() {43  BackHandler.addEventListener('hardwareBackPress', this.handleBackPress);44}45componentWillUnmount() {46  BackHandler.removeEventListener('hardwareBackPress', this.handleBackPress);47}48handleBackPress = () => {49  return true;50}51import { BackHandler } from 'react-native';52componentDidMount() {53  BackHandler.addEventListener('hardwareBackPress', this.handleBackPress);54}55componentWillUnmount() {56  BackHandler.removeEventListener('hardwareBackPress', this.handleBackPress);

Using AI Code Generation

1import { NavigationActions } from 'react-navigation';2import { RootNavigator } from '../navigators/AppNavigator';3const firstAction = RootNavigator.router.getActionForPathAndParams('Login');4const tempNavState = RootNavigator.router.getStateForAction(firstAction);5const secondAction = RootNavigator.router.getActionForPathAndParams('Home');6const initialNavState = RootNavigator.router.getStateForAction(7);8export default function nav(state = initialNavState, action) {9  let nextState;10  switch (action.type) {11      nextState = RootNavigator.router.getStateForAction(12        NavigationActions.back(),13      );14      break;15      nextState = RootNavigator.router.getStateForAction(16        NavigationActions.back(),17      );18      break;19      nextState = RootNavigator.router.getStateForAction(action, state);20      break;21  }22  return nextState || state;23}24this.props.navigation.navigate('Profile', { name: 'Lucy' });25import { withNavigation } from 'react-navigation';26class MyBackButton extends React.Component {27  render() {28    return (29        onPress={() => this.props.navigation.goBack()}30    );31  }32}33export default withNavigation(MyBackButton);34import { useNavigation } from '@react-navigation/native';35function MyBackButton() {36  const navigation = useNavigation();37  return (

Using AI Code Generation

1import { BackHandler } from 'react-native';2import { NavigationActions } from 'react-navigation';3import { RootNavigator } from './RootNavigator';4const navReducer = (state, action) => {5  const newState = RootNavigator.router.getStateForAction(action, state);6  return newState || state;7};8export default navReducer;9import { StackNavigator } from 'react-navigation';10import { Home, About } from './screens';11const RootNavigator = StackNavigator({12  Home: { screen: Home },13  About: { screen: About },14}, {15});16export default RootNavigator;17import React from 'react';18import { StyleSheet, Text, View, Button } from 'react-native';19export default class Home extends React.Component {20  static navigationOptions = {21  };22  render() {23    return (24      <View style={styles.container}>25        <Button title="Go to About" onPress={() => this.props.navigation.navigate('About')} />26    );27  }28}29const styles = StyleSheet.create({30  container: {31  },32});33import React from 'react';34import { StyleSheet, Text, View, Button } from 'react-native';35export default class About extends React.Component {36  static navigationOptions = {37  };38  render() {39    return (40      <View style={styles.container}>41        <Button title="Go to Home" onPress={() => this.props.navigation.navigate('Home')} />42    );43  }44}45const styles = StyleSheet.create({46  container: {47  },48});49import React from 'react';50import { StyleSheet, Text, View } from 'react-native';51import { Provider } from 'react-redux';52import { createStore, applyMiddleware } from 'redux';53import { createLogger } from 'redux-logger';54import thunk from 'redux-thunk';55import { RootNavigator } from './RootNavigator';56import { addNavigationHelpers } from 'react-navigation';57import nav

Using AI Code Generation

1import {BackHandler} from 'react-native';2import {NavigationActions} from 'react-navigation';3import {connect} from 'react-redux';4import {bindActionCreators} from 'redux';5import {goBack} from '../actions/navigation';6class App extends Component {7  componentDidMount() {8    BackHandler.addEventListener('hardwareBackPress', this.onBackPress);9  }10  componentWillUnmount() {11    BackHandler.removeEventListener('hardwareBackPress', this.onBackPress);12  }13  onBackPress = () => {14    const {dispatch, nav} = this.props;15    if (nav.index === 0) {16      return false;17    }18    dispatch(goBack());19    return true;20  };21  render() {22    return <RootStack />;23  }24}25const mapStateToProps = state => ({26});27const mapDispatchToProps = dispatch => bindActionCreators({goBack}, dispatch);28export default connect(29)(App);30import {NavigationActions} from 'react-navigation';31export const goBack = () =>32  NavigationActions.back({33  });34import {combineReducers} from 'redux';35import {reducer as nav} from './navigation';36const AppReducer = combineReducers({37});38export default AppReducer;39import {NavigationActions} from 'react-navigation';40import {RootStack} from '../config/router';41const initialState = RootStack.router.getStateForAction(42  RootStack.router.getActionForPathAndParams('Home'),43);44export const reducer = (state = initialState, action) => {45  const nextState = RootStack.router.getStateForAction(action, state);46  return nextState || state;47};48import {createStackNavigator, createAppContainer} from 'react-navigation';49import Home from '../screens/Home';50import About from '../screens/About';51const RootStack = createStackNavigator(52  {53  },54  {55  },56);57export const RootStackContainer = createAppContainer(RootStack);58export {RootStack};59import React from 'react';60import {View, Text, Button} from 'react-native';61export default class Home extends React.Component {62  render() {63    return (

Using AI Code Generation

1import {NavigationActions} from 'react-navigation';2import {BackHandler, Alert} from 'react-native';3import {connect} from 'react-redux';4import {bindActionCreators} from 'redux';5import * as actions from '../actions/actions';6class Test extends Component {7  constructor(props) {8    super(props);9    this.state = {10    };11  }12  componentDidMount() {13    BackHandler.addEventListener('hardwareBackPress', this.handleBackButton);14  }15  componentWillUnmount() {16    BackHandler.removeEventListener('hardwareBackPress', this.handleBackButton);17  }18  handleBackButton = () => {19    const {navigation, actions} = this.props;20    const {isExit} = this.state;21    const {routes} = navigation.state;22    const {routeName} = routes[routes.length - 1];23    if (routeName === 'Home') {24      if (isExit) {25        BackHandler.exitApp();26      } else {27        this.setState({isExit: true});28        setTimeout(() => {29          this.setState({isExit: false});30        }, 2000);31      }32    } else {33      navigation.dispatch(NavigationActions.back());34    }35    return true;36  };37  render() {38    return null;39  }40}41const mapStateToProps = state => ({});42const mapDispatchToProps = dispatch => ({43  actions: bindActionCreators(actions, dispatch),44});45export default connect(46)(Test);47import React from 'react';48import {createAppContainer} from 'react-navigation';49import {createStackNavigator} from 'react-navigation-stack';50import Home from './screens/Home';51import Test from './screens/Test';52const AppNavigator = createStackNavigator(53  {54    Home: {55    },56    Test: {57    },58  },59  {60  },61);62export default createAppContainer(AppNavigator);

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