Most voted "mobile" questions
Questions related to software development for portable devices such as mobile phones (en: mobile) and tablets, on or off the web (mobile sites) (apps).
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answers852
viewsError running mobile app
When executing react-native run-android gives the following error: FAILURE: Build failed with an Exception. What Went Wrong: Execution failed for task ':app:mergeDebugResources'. Error:…
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answer164
viewsBootstrap mobile working as -Md
I’m starting a project with bootstrap, but I can’t adjust the mobile. <div class="col-xs-12 col-lg-3 col-md-6 nopadding black appear "> <img src="img/portfolio/thumbnails/1.jpg"…
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answer112
viewsError running app directly on IOS device
I have an app that runs perfectly in the simulator, the same is already signed with my dev account. But when I try to build to run on a "physical" device some errors happen, I already tried to…
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answers451
viewsReact Native - Use camera
I would like a help I started a project in which I now need to use the Camera of the mobile. I created the project with the create-react-native-app, however I can’t find a component or solution…
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answer108
viewsComponent problem called expendable in Ionic 3
Guys, I really need your help. According to this tutorial tutorial I need a custom component that displays the following error: "Can’t bind to 'expandHeight' Since it isn’t a known Property of…
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votes2
answers1368
viewsIs it a good idea to use JSON as a database?
I’m doing a mobile app project. Using Python and Kivy. My project has three main classes to save in a database (it’s a ticket selling app): Tickets, Events and Users. Searching, I saw that JSON is…
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answer298
viewsHow does it work to put dynamic content by making an Android app natively?
Guys, I’m seeing a little bit of mobile development (Android), and I saw that the design is done using XML, and from what I saw, it seems to have no loop tag, to repeat similar structures, and…
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answer56
viewsBootstrap Responsiveness - Grid Issues
Hi, I’m developing a site and I need to fix this piece to stay this way on mobile But if I make a change to make it good in low resolutions, it ends up ruining the larger versions. Follow the code…
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answer80
viewsNormal and long click only work after a first click on Imageview
I am with a problem that when I click on the image, the first time nothing happens, only after the first click it works simple click function and long click. XML code: <ImageView…
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answer64
viewsMultilaser tablet does not load svg positioning correctly
I created a character using SVG, which appears unmounted on the tablet inside the webview, this happened in the standard browser also tablet: Multilaser Android 4.4.2 Model Number: ML02-M9-Quad-Core…
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answer47
viewsBuild Web-based Mobile Application
Good evening guys, I am participating in a project volunteer to a group and we have a web application ready, developed in PHP with the Laravel framework. We need a data inclusion form for this…
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answers550
viewsRun a function and if it takes longer than x seconds of error - React Native
Good afternoon! I made a function that searches the data of a JSON on the Web, but I wanted to involve it in a function that took longer that for example 10 seconds exploded an error on the screen,…
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answer483
viewsHow to return data from a thread to the runtime layout in flutter
There is how to thread using the flutter and return the processing result on the screen? I have the following code. In the main class _Myhomepagestate I have the layout and function _process(). The…
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answer35
viewsOpen Activity by clicking an item in a custom listview
I created a custom listview, it’s all right, I tried it here but it’s not right, I wanted to implement the click on an item, but since it’s custom listview maybe it’s something different, I’m a…
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answer528
viewsLabel position in React Native Picker
I’m using the component Picker of React Native and ta working, listing, selecting and such, only that I can not style it well, I was able to put edge, arrange the size but the text that is inside it…
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answers168
viewsImage in Drawer updating several times
I’m building an application with React Native and React Navigation, I’ve made all the settings and it’s working, however, when Drawer is triggered the image is updated multiple times without causing…
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answers27
viewsHow to set a minimum width for a responsive layout?
I’m working on a "responsive" HTML layout whose internal elements adjust to the width of the desktop screen and devices mobile. However, I cannot structure my layout functionally below 480px.…
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answer563
viewsJquery does not work in the Mobile Browser
I have a responsive page to make an e-commerce and have the following code to add or remove quantity: // HTML <a class="menos" class='fas fa-minus-circle'><i></i></a> <p…
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answers22
viewshow to create a directory on android system?
I’m using the following code to create a directory when the user presses a button inside a Fragment, but it’s still not working, and I don’t know why. File dir = new File("/novaPasta"); try{…
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answer324
viewsHow to convert Jsonobject to a java class
Greetings to all, I’m developing an app that takes the return of a webservice to be used in this application as login data among others. I would like to ask for your guidance on how best to convert…
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answer256
viewsLoading dependency Graph, done. error: bundling failed: Referenceerror: Unknown helper objectSpread2 at loadHelper
I am developing an app in React On. However when generating buildo I get message: Loading dependency Graph, done. error: bundling failed: Referenceerror: Unknown helper objectSpread2 at loadHelper…
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answers86
viewsNav-tabs is not visible in mobile
On monitor, works normal, but in mobile the Nav disappears. To test and see if it was not some script that was missing in my code, I downloaded an example of bootstrap with all the links a css e js…
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answer409
viewsError when converting json with object lists to a Dart object
Good morning to you all! I am getting the following error while trying to convert a json to Dart. [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: type '_Internallinkedhashmap' is…
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answer474
viewsDisplay numeric keypad when an input receives focus on mobile version
I’m developing a web interface with HTML5, CSS3 and the framework Bootstrap 3, and using the type="number" on the tag <input> on smartphones the native keyboard of Android open in numeric…
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answer1107
viewsDecimal Flutter
Gentlemen, good night! I have a problem in my calculation because it is coming out broken values, Ex: 13,3434 I would like you to leave only 13,34. Follow the code for better viewing. Future…
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answer327
viewsCheck if table exists before entering value in the Sqflite -- Flutter database
I am developing an app, my problem is that with app updates I can use other tables that do not yet exist in the existing database. The solution that came to mind was always before entering a value…
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answers89
viewsConsumption given in the Firebase Database
I’m having a doubt that’s making me nervous, and I couldn’t find the answer. On Android, when we’re making an app, usually there are several calls to collect "the same" data from Firebase. For…
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answer140
viewsError in Calculus
I have a problem with the conversion of String for double. As you can see in the code, my if for in the variable latas and difvalor because you’re making the mistake: A value of type 'double' can’t…
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answer1193
viewsActive React application does not connect to Node.js server on my laptop
I’m developing an app in React Native, using the expo. I have a Node.js API running on my Macbook. Both my phone and laptop are under the same Wifi network. In the app, I have an API call pointing…
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answers184
viewsI can’t set correct the environment variables for android to use Ionic
I’m starting in mobile and I’m doing the setup for Ionic. Well my difficulty is being on time to run sudo cordova run android who returns me: Checking Java JDK and Android SDK versions…
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answer211
viewsManipulate two different values in the same input text React Native expo
Good evening, I am developing a calculator to study component manipulation in React Active, using expo, however I have a logic problem, when I type the first value1, and then select one of the types…
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answer174
viewsI’m having trouble understanding async no flutter
import 'package:flutter/material.dart'; import 'package:ouvinos_caprinos/especie/class/especie.dart'; import 'package:ouvinos_caprinos/especie/db/especie_database.dart'; import…
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answer22
viewsDynamic defaultPage for mobile app
Good morning/late/evening! I am developing a mobile APP! In this APP there is a login screen and a main screen. I want the user not to have to log in every time he enters the APP, the first time the…
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answers106
viewsHow to click on two different '<div>' at the same time on mobile devices?
I’m creating a website to play musical notes and for that I need to click multiple buttons (Divs) at the same time, but when I do this nothing happens, only when I click one button. On the computer…
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answer26
viewsI can’t find where I went wrong in my PWA
Hi. I’m with a problem, I’m not understand why my service worker is not registering, I’ll send some prints and my code, I thank from now to all help my sw.js code: var CACHE_NAME = 'static-v10'; var…
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answer57
viewsdisable javascript in mobile version
Good afternoon, I’d like to know the following, i have this site: www.dinoalves.I And he wanted the mobile version, he just kept the background that is behind with the logo and Coming soon, without…
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answers33
viewsScreens starting on full screen
I’m facing a problem with browsing between screens in my app, the screens are starting on full screen and I can’t leave it normal. What I call navigation void onDonePress() { // Do what you want…
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answer290
viewsHow do I update a Widget via a controller in an Onchanged field?
I cannot update a Text widget that should show the sum of two Textformfield as long as someone is changing it (Onchanged). What could I be doing wrong? (I’ve put Setstate everywhere and nothing has…
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answers10
viewsKeyboard opens by clicking on product image in mobile
I am facing a problem of bad behavior of the html elements in the mobile mode of my page. Every time I click on the product image, the keyboard opens before being redirected to the url the link…
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answer181
viewsHow to update Dropdownbutton Value State in Flutter with Getx without using Setstate?
I’m trying to make a Dropdownbutton in my project through a Futurebuilder. Before using Getx to update the Value state, I used setState and it worked. After modifying the project for the use of Getx…
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answers27
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viewsUsing Seekbar in minute form
Everybody, good afternoon, everybody! I am developing an app for study purposes. I am a beginner in mobile programming. My app has an interface similar to the Netflix interface where I’m trying to…
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answer49
viewsNotification permission dialog is not called in Chrome/firefox mobile
I’m trying to make a notification using the Notification on Chrome/firefox mobile, however I cannot request permission for the user. I put a alert to show what is the current page notification…
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answers26
viewsHow do I close a notification that doesn’t close?
The following notification code I use but it does not close Notification notification = new NotificationCompat.Builder(this, CHANNEL_ID_2) .setSmallIcon(playPauseBtn) .setLargeIcon(thumb)…
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answers37
viewsRequest problem that only falls in catch
I’m working on a new project so I don’t have much control of the code and I’ve reached a problem where the request doesn’t work or returns something where I can’t solve , it just falls into the…
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answer182
viewsFlutter Mobx load data at page start
I am studying/learning about mobx, and I am like the following problem: I have a controller that picks up and saves some settings with Shared Preferences. The saving part of the data is working…
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answer15
viewsTrade an image with Kotlin?
Hello I am new learning Kotlin and I have the following problem, I have a View image with two buttons, move forward and backward. In a gallery of 5 photos I would like to keep exchanging images so…
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answer21
viewsError with Nav Controller
I am facing problems running my app because it does not open the main, the problem is in my Nav controler but do not know how to solve it. Log: E/AndroidRuntime: FATAL EXCEPTION: main Process:…
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answer223
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answers48
viewsFlutter + Php + Mysql
Well, I’m new to flutter but basically I’m doing a simple registration with 3 fields. Summarizing my problem is that I can register normally by Androidstudio emulator, but when Gero APK and I try to…