This is due to not open port from your machine. Linux (Ubuntu) In Ubuntu Run In terminal sudo ufw status verbose To view open port if you cannot found 19000 port open then you need to open port using sudo ufw allow 19000/tcp and then again run sudo ufw allow 19001/tcp to serve http for … Read more
I was receiving this error message when running react-native run-android. When I ran cd android && ./gradlew clean I was getting permission errors also. I ran chmod +x gradlew and it started working
I did it like this: import React from ‘react’; import {ScrollView, Text} from ‘react-native’; const isCloseToBottom = ({layoutMeasurement, contentOffset, contentSize}) => { const paddingToBottom = 20; return layoutMeasurement.height + contentOffset.y >= contentSize.height – paddingToBottom; }; const MyCoolScrollViewComponent = ({enableSomeButton}) => ( <ScrollView onScroll={({nativeEvent}) => { if (isCloseToBottom(nativeEvent)) { enableSomeButton(); } }} scrollEventThrottle={400} > <Text>Here is … Read more
The quick and less optimized way to do this is by using arrow function inside your onChangeText callback, by passing username as your argument in your onChangeText callback. <TextInput ref= {(el) => { this.username = el; }} onChangeText={(username) => this.setState({username})} value={this.state.username} /> then in your _handlePress method _handlePress(event) { let username=this.state.username; } But this has … Read more
Try this: import React, { Component, PropTypes } from “react”; import { Image } from “react-native”; export default class ScaledImage extends Component { constructor(props) { super(props); this.state = { source: { uri: this.props.uri } }; } componentWillMount() { Image.getSize(this.props.uri, (width, height) => { if (this.props.width && !this.props.height) { this.setState({ width: this.props.width, height: height * (this.props.width … Read more
I had the same issue and it was resolved by simply adding following import statement in MainApplication.java: import com.facebook.react.BuildConfig;
Have a go and try: npm add @babel/runtime Or upgrade babel runtime: “@babel/runtime”: “7.0.0-beta.55”
The only thing that helped me was clearing cache: npm cache clear –force
Note This answer was written for react-navigation: “3.3.0”. As there are newer versions available, which could bring changes, you should make sure that you check with the actual documentation. Passing data between pages in react-navigation is fairly straight forward. It is clearly explained in the documentation here For completeness let’s create a small app that … Read more
AsyncStorage is not suitable for storing sensitive information. You might find this useful: https://github.com/oblador/react-native-keychain It uses facebook conceal/android keystore to store encrypted data to SharedPreferences (Android) and keychain on iOS. (I co-authored the lib). Be sure to read the entire readme to understand what it offers.