expo

问题 I'm currently learning React-native. I am following a Pluralsight tutorial but unfortunately some of his code is out of date. I have the following code: import Expo from 'expo'; import React from 'react'; import TaskList from './TaskList'; import { Component, View, Navigator, Text } from 'react-native'; class todo extends React.Component { constructor(props,context){ super(props,context); this.state ={ todos: [ { task: 'Task1', }, { task: 'Task 2', }, ] } } onAddStarted(){ this.nav.push({

问题 I try to run expo optimize and it says it requires sharp-cli . So I install sharp-cli as it directs. And then it gives me the same error. (first step described above is left out) $ npm install -g sharp-cli@1.10.0 /Users/TuzMacbookPro2017/.npm-global/bin/sharp -> /Users/TuzMacbookPro2017/.npm-global/lib/node_modules/sharp-cli/bin/cli.js + sharp-cli@1.10.0 updated 1 package in 24.632s $ expo optimize This will overwrite the original assets. Optimizing assets... Optimizing ./assets/electro-icon

问题 So I am trying to authenticate users to firebase and add them to my users collection and store them by their unique id. When I go to my signup screen, if I reload the simulator the first account I try to sign up will authenticate but not be added to the database, but any subsequent account I add will authenticate and upload to the database. However, once I reload the application it will restart the process of not uploading the first one. This is the call I am making- firebase.auth()

问题 Getting an error using AppAuth from 'expo-app-auth'; When i try to authi get the following error: [Error: ExpoAppAuth.Get Auth: JSON deserialization error] const config = { serviceConfiguration: { authorizationEndpoint: 'https://api.netatmo.com/oauth2/authorize', tokenEndpoint: 'https://api.netatmo.com/oauth2/token', }, clientId: 'cilentid', clientSecret: 'cilentsecret', scopes: ['read_presence'] } Is it something with the config? 回答1: Your config is not valid. This is related to the issue at

问题 I have a message which I can't remove when running my application The following APIs have moved to separate packages and importing them from the "expo" package is deprecated: Constants. Add correct versions of these packages to your project using: expo install expo-constants If "install" is not recognized as an expo command, update your expo-cli installation. Change your imports so they use specific packages instead of the "expo" package: import { Constants } from 'expo' -> import Constants

问题 I recently ejected my react-native project and the camera feature is not working. The code allows users to upload images. It works with expo but after eject and running with Android, it stopped working. This is code for the camera upload: import * as Permissions from 'expo-permissions'; import * as ImagePicker from 'expo-image-picker'; _checkPermissions = async () => { const { status } = await Permissions.askAsync(Permissions.CAMERA); this.setState({ camera: status }); // take permission for

问题 When I try to run the lastest update of the Expo application (released 9 jan 2019), I get the following errors: This is before I even start my own project. I am running the Expo app on an Android device. Does anyone have a clue why this is happening? 回答1: What solved the problem for me was to clear the data for the app. If you are wondering how to do that, here is a guide: How to clear cache and app data in Android 来源： https://stackoverflow.com/questions/54158040/lastest-version-of-expo-gives

问题 Suppose I have an Image, for example from the Image Picker, that looks like this: { "height": 2848, "origURL": "assets-library://asset/asset.JPG?id=B84E8479-475C-4727-A4A4-B77AA9980897&ext=JPG", "cancelled": false, "width": 4288, "fileSize": 342120, "isVertical": false, "uri": "file:///Users/sepp/Library/Developer/CoreSimulator/Devices/998C81E0-5CC6-4A3E-90C2-A7C43060220C/data/Containers/Data/Application/53F9F372-37DD-4CD2-B5E2-0D984A064686/Library/Caches/%2540anonymous%252Fcleanguide

问题 I'm trying another solution to my problem: The thing is: im rendering a Sketch component with a background image and sketching over it onReady = async () => { const { layoutWidth, layoutHeight, points } = this.state; this.sketch.graphics = new PIXI.Graphics(); const linesStored = this.props.screenProps.getSketchLines(); if (this.sketch.stage) { if (layoutWidth && layoutHeight) { const background = await PIXI.Sprite.fromExpoAsync(this.props.image); background.width = layoutWidth * scaleR;

问题 My react-native application (on Android) does not shut down when back button is pressed. It closes and goes in the background and runs there (animates). I also tried this, but got the same outcome: BackHandler.addEventListener('hardwareBackPress', () => { console.log('back pressed'); BackHandler.exitApp(); }); I want it to completely shut down when I press back or home button. P.S. I'm using Expo for development and deployment, and also start the app through it. 回答1: constructor(props) {