Flutter Tutorial – Navigation and Passing params between Screens (Android and iOS)

By | December 22, 2018

Hello devs… This is a simple tutorial in which we will see how to navigate between two screens in flutter and pass params from one screen to another screen. Below is the video of the sample app we are going to make… You can watch the complete video tutorial below… Watch Tutorial You can see the video tutorial… Read More »

Service Call in Flutter with Retry Button, Catch Network failures.

By | December 20, 2018

Hello Devs, In today’s tutorial we will find out how we can write a simple service call in flutter and show retry when network call fails. Below is a sample video of the app we are going to make… Watch Video Tutorial You can watch the complete video tutorial from here… Add Library To do service calls in… Read More »

Load data from internet to a GridView in Flutter with Retry Logic, JSON parsing and Error handling in Flutter

By | December 15, 2018

I am assuming that you already have some understanding about Flutter. If you have no information about Flutter SDK, then I could recommend first going to flutter.io and get the initial knowledge. Our Final app will look like this. You can watch the complete video tutorial from here… App will implement GridView JSON Implementation Error Handling Retry Implementation… Read More »

Is Javascript Multithreaded? How it handles asynchronous actions?

By | December 14, 2018

Javascript is a single threaded application. That means you cannot run more than one script at one time to modify DOM or something. But there are something called “Worker Threads” that spans separate threads outside your application that can do complex tasks which is linked by a Callback method. What is a Web Worker? When executing scripts in… Read More »

What is Context in Android and What is the proper way to use it?

By | December 7, 2018

Lets see what a Context is… Context : Current State of the application. Context : Handle of the application. Context : Provides access to the resources, preferences, accessing database etc. Activity inherits from the Context. Context is the most important part of the Android application and its everywhere. If you wrongly use Context, it can lead to memory… Read More »

Using WKWebkit in iOS – Simple Example

By | December 2, 2018

Whenever you want to show a webpage in your iOS App, use WKWebview instead of UIWebview. You have to supply an url that is complete. ie. with “http” or “https”. If you are using “http”, make sure you enable the “App Transport Security Settings” and add “Allow Arbitrary Loads” to yes.     Our Final output will look… Read More »

How to configure Firebase Google-Services.json for different targets in iOS?

By | November 3, 2018

Once you have different Google-Services.json for different targets for your firebase applications, you may be wondering how all can have same filenames and configure for different targets. However the solution is simple. Initial Steps * Create new directory for each directory inside for project folder. Make sure the folder name is different from the target name (you can… Read More »

Using Content Resolver to List Contacts – Android

By | October 31, 2018

Here is a simple example to list contacts in android using the Content Resolver. Note : You need to have two things before accessing contacts. 1. Contacts Permission in the Android Manifest 2. Ask Runtime permission from the user Code Here is our MainActivity that lists the contacts. MainActivity.java Adapter Class Below is the adapter class for the… Read More »

RNFirebase core module was not found natively on ios – Fix

By | October 28, 2018

This issue happens in react-native-firebase for a various reasons. First thing you have to do is check Firebase/Core is in your pods. Try Cleaning and rebuilding your project. Click on the target you are running in xcode and check the frameworks section in ‘General’ Tab -> Check you have linked libFirebase.a there. If not click the “+” button… Read More »

Interview Question – 9

By | October 15, 2018

Question Maria plays college basketball and wants to go pro. Each season she maintains a record of her play. She tabulates the number of times she breaks her season record for most points and least points in a game. Points scored in the first game establish her record for the season, and she begins counting from there. For… Read More »

Doing Simple Navigation in Flutter – Simple Example

By | October 12, 2018

Navigation is done is Flutter using the Navigator class. Lets look at a simple example The first thing you have to register routes for difference screen is to build a Map of ‘String’ (route) and the page (Widget).   Lets say I have a utility class for the Creating Routes named routes.dart. The contents of route.dart contains the… Read More »

GridView Demo in Flutter

By | October 10, 2018

Hi Friends, Today we will see how to implement GridView in Flutter.     We are going to use this service for the data First we will create a Model for the Grid Cell No we will create view for Grid Cell Create a file named “cell.dart” and copy this into it. Service Class We have the below… Read More »

Interview Question & Answer – 9

By | October 10, 2018

Question Given a time in -hour AM/PM format, convert it to military (24-hour) time. Note: Midnight is 12:00:00AM on a 12-hour clock, and 00:00:00 on a 24-hour clock. Noon is 12:00:00PM on a 12-hour clock, and 12:00:00 on a 24-hour clock. Sample Input 07:05:45PM Sample Output 19:05:45 Solution

Doing HTTP Calls in Flutter and Parsing Data

By | October 7, 2018

Here is a simple example of doing Http calls in Flutter. In this example we will try to fetch some JSON value from the below url https://jsonplaceholder.typicode.com/posts/1 You can read more from here. Add Dependencies First you need to add the http plugin in dependencies. The latest version of http can be found here (https://pub.dartlang.org/packages/http). Example Lets look… Read More »