mobile

问题 I have an automotive companion app that needs to communicate with both wifi and mobile data networks. My vehicle control unit provides a wifi network without internet access which exposes an API service that we can call from the app. In addition to this we need to communicate with another backend reachable from the internet using phone mobile data (3G/4G). I immediately noticed that some android phones, when connected to a wifi network without internet using android settings menu , show a

问题 I am building a web application in react js and I'm using the material-ui components library. I'm using the table component and it looks good on desktop but I want it to adjust and look good also on mobile browser. Is material-ui supports such thing? How can I do it? Example of the current situation: PC\Mobile: Source code: import React from 'react'; import PropTypes from 'prop-types'; import { withStyles } from '@material-ui/core/styles'; import Table from '@material-ui/core/Table'; import

问题 This question already has an answer here : Firebase - Is auth.uid a shared secret? (1 answer) Closed 2 years ago . I've been reading Firebase Realtime Database Security Rules guides (https://firebase.google.com/docs/database/security), and I'm a bit confused with regards to should I keep the UID generated by the Firebase Auth (lets say if my App users use Facebook to authenticate themselves) secret? I have this kind of data structure: users UID Lots of nodes of personal data to be read

问题 I am having an issue where some images are not displayed in the mobile browsers on my iPhone, but I see them in all my desktop browsers. On my phone, I just see a blank box with a grey border where the image should be. A couple notes: It seems to happen randomly because some images are displayed one day, and then will stop displaying the next day I noticed if I scroll through the page while it is still loading, I can often see the image, and then it disappears. All the images are placed in

问题 I am trying to store selected images within the application, as opposed to in the image roll. Here is what I have tried: await FileSystem.downloadAsync( imageUri, // the image uri from expo-image-picker FileSystem.documentDirectory + `${uuid}-image.jpg` ) .then(({ uri }) => { console.log("Finished downloading to ", uri); }) .catch((error) => { console.error(error); }); I receive the error: Unable to download file: Error Domain=NSURLErrorDomain Code=-1002 "unsupported URL" I also tried: await

问题 I want to make audio player for my project. I dont know how to play audio with TouchableOpacity. I want to play audio but when I press on play icon (button) it have to be changed to pause icon (button). And I need some solution for loop. How can I use it? <TouchableOpacity style={styles.playButtonContainer}> <Ionicons name="ios-play" size={75} color="#000" /> <Ionicons name="ios-pause" size={75} color="#000" /> </TouchableOpacity> <TouchableOpacity> <Entypo name="loop" size={40} color="#000">

问题 I'm currently working on a responsive webdesign. The "smartphone view" is not yet ready because my client has to obtain some more budget. Therefore I need to implement a temporary view which I want to realize with an fixed viewport that only gets activated on smartphones. I set the viewport using on this way: <meta name="viewport" content="width=device-width, initial-scale=1.0"> I want to change the device-width to 700 pixels if the following media query gets triggered: @media only screen and

问题 I'm currently working on a responsive webdesign. The "smartphone view" is not yet ready because my client has to obtain some more budget. Therefore I need to implement a temporary view which I want to realize with an fixed viewport that only gets activated on smartphones. I set the viewport using on this way: <meta name="viewport" content="width=device-width, initial-scale=1.0"> I want to change the device-width to 700 pixels if the following media query gets triggered: @media only screen and

问题 I had problem with iframe that was loading a document using google document viewer, sometimes the document would not load. I used this solution to check if iframe is successfully loaded, or if it should be reloaded. The solution works great on pc(chrome), but on iphone(safari) $('#iframe').on('load', ...) event triggers even when there is no content. On pc on load event is only triggered when iframe is trully loaded and has content. function reloadIFrame() { document.getElementById("ifm").src

问题 I'm developing WebView mobile application in Flutter and I would like to customize webview errors, because if customer will have his wifi turned off and he got "net::ERR_ADDRESS_UNREACHABLE", it's not so good. So i would like to change this page to some custom design and show something like "This application requires internet connection, you should turn your wifi on".. Is something like this possible? I was searching in docs and found nothing. Thanks a lot. 回答1: You can try my plugin flutter