How to do Unit Test of functions and Widgets in Flutter?

By | September 24, 2018

Lets see how we can test Flutter Apps. It would be easy if we continue from the previous example…   Start unit Testing We will create a test file named ‘widget_test.dart’ inside the ‘test’ folder. To test Widgets, we will use the ‘testWidgets’ function. Lets see how it will look like… The test function in MyHomePage will look… Read More »

James

Start with Flutter – Build Android and iOS Apps Instantly.

By | September 23, 2018

In this course we will learn how to Start with Flutter, Google’s own cross platform solution.     So I am assuming that you have the flutter SDK and other stuff installed. if not please go to https://flutter.io and download it and setup. Android Studio If you are using Android Studio as your primary editor, then you should… Read More »

James

Things to Know About Mobile UX

By | August 30, 2018

Mobile user experience is not only related to design something to use on the mobile devices. It is a process that requires brainstorming, research and development to find out how you can better consider the UX and apply it in your UI. Keep in mind that the number of mobile internet users is increasing day by day. So,… Read More »

James

Project Treble – Android Version Fragmentation Solved

By | August 18, 2018

Solved Yes, a longtime problem with Android has been solved. Yes, version fragmentation problem. Version fragmentation is often Android from different manufacturers had been stuck on different versions which makes it difficult for developers to support all variety of devices. Hopefully the problem is going to be solved. From Google’s perspective, an OS rollout is actually a three-stage… Read More »

James

How to listen to events from react native?

By | August 14, 2018

Hi friends, This is essentially a continuation of this post http://www.coderzheaven.com/2018/08/10/how-to-create-a-custom-native-imageview-in-android-for-reactnative/ Now we will listen to a click event from the image we just created. For that we have to add the ClickListener to the image in Android. Add below methods to the java class On the React Native Side The whole java class will look like this.

James

How to extend styles in React-Native?

By | August 12, 2018

We will create different styles to style different components, correct? And most of them will have duplicate elements, correct? What are the disadvantages of this problem? You will clutter your file with duplicate lines of code. It will increase the file size and increase the application size. Not very efficient way of coding. Limited reusability. How to fix… Read More »

James

How to create a custom native ImageView/View in Android or iOS for ReactNative?

By | August 10, 2018

Many times we need custom components from native. Here is a simple example on how to create a custom imageview in Android for react native. First we will start with the Android Version Android Create a class that extends SimpleViewManager. Write a setSrc method which accepts the source url from React Native. Implement ‘createViewInstance’ method in which you… Read More »

James

Awesome React Native Image Caching Libraries

By | August 4, 2018

Image Loading and caching had been a little bit pain in react native. In-fact react native didn’t had native support for caching. But after the recent release, there is now support for caching in iOS only. Still not for Android. You can read more about this from here https://facebook.github.io/react-native/docs/images.html#cache-control-ios-only Now these are the variety of options available. default:… Read More »

James

All About React Native Animation

By | July 25, 2018

Animations are achieved in React Native using the Animation API. Below are the methods Animated.timing() — Maps time range to easing value. Animated.decay() — starts with an initial velocity and gradually slows to a stop. Animated.spring() — Simple single-spring physics model (Based on Rebound and Origami). Tracks velocity state to create fluid motions as the toValue updates, and can be chained together. Here we… Read More »

James

Top 10 most downloaded and used mobile apps

By | July 23, 2018

Studies show that we spend more time with our mobile devices every day, either working or enjoying our leisure time. And we use apps in these devices . But what are the ones that we use the most? Sensor Tower is a company dedicated to the marketing of mobile applications, which periodically publishes a report that collects the… Read More »

James

8 things you need to know before becoming a blockchain developer

By | July 20, 2018

The blockchain is one of the fastest-growing markets in the entire IT industry. According to the report, the global blockchain technology market is predicted to reach $2.3 billion by 2021, creating a big demand for more engineers and software developers. It obviously represents a colossal career potential for talented blockchain specialists. An average software developer in the US… Read More »

James

Free Daily News App

By | July 18, 2018

Download our free news app and get instant news from popular news channels instantly. Get the app from here… https://play.google.com/store/apps/details?id=app.mobile.daily_news          Please download and leave your valuable feedback as well. Why you will download this app? Fast and efficient. Incorporates news from all famous news channels. Consumes minimal battery. No intruding ads or notifications. Completely… Read More »

James

How Image Loading Libraries work in Android?

By | July 14, 2018

In this article, Lets find out how the image loading libraries like Picasso, Glide and Fresco works. We know that images are the one which takes most of the space in our application either in App size or the memory at runtime. Also using large number of images often kicks off Garbage Collection (GC) Events. The more number… Read More »

James

How to show a Snackbar in Flutter? iOS and Android.

By | May 20, 2018

Here is a simple example where the user clicks a button to show a Snackbar. We know that there is no inbuilt snackbar for iOS. But Flutter makes it easy to do without any custom native code. You can see a Demo video here. Here we use two main elements Scaffold Snackbar The Scaffold Widget from the material… Read More »

James

How to encrypt and decrypt an audio file in Android?

By | May 8, 2018

Here is a simple example to encrypt and decrypt a audio file in Android. We will directly go to the implementation part. Demo Video You can check the demo video here. Download Library You can download the simple library from here. Aim Download an audio file from internet. Encrypt and save the encrypted file in Disk, so that… Read More »

James

AutoConnect to Wi-Fi in iOS

By | May 5, 2018

Apple has introduced a new API in iOS 11 where you can directly connect to a Wi-Fi from with-in the app. For this code to work 1. you need to enable the networking capabilities in your provisioning profile. 2. Once you enable the networking profile in the provisioning profile, you need to regenerate and sign the app with… Read More »

James

Android’s new D8 dexer

By | April 30, 2018

Google has now come up with a new compiler for Android, the D8. This one is basically improved and efficient compared to the DX compiler. Google had shipped the D8 compiler along with Android Studio 3.0 with a opt-in feature. In the initial phase the default compiler would be DX, then Google will deprecate it in later phase.… Read More »

James

What are promises in React Native, How is it different from Callbacks?

By | April 23, 2018

Basically saying both are same. But there are some differences. Lets see what are some of the advantages of Promises. Promises are just a cleaner way for running asynchronous callbacks. Promises also has error catching mechanism which are not in callbacks. Promises are an abstraction for cleaner and better functional code. What are callbacks? Callback is a function… Read More »

James

React Native Module Bridge Example

By | April 15, 2018

The document demonstrates the steps to create react native module bridge in Android and iOS. Below are the steps for creating a native bridge in Android. ANDROID Open the Android Studio with the corresponding project from your react native project. Step 1 : Create the Java class that extends ReactPackage. (eg: AndroidModulePackage.java). Implement the interface methods (createViewManagers &… Read More »

James

Room Database from Google – A Simple Example

By | April 5, 2018

Lets talk about the Room Persistent Library from Google. The Room persistence library provides an abstraction layer over SQLite to allow fluent database access while harnessing the full power of SQLite. The library helps you create a cache of your app’s data on a device that’s running your app. This cache, which serves as your app’s single source… Read More »

James

Implementing GCM in Android

By | March 30, 2018

Hi Friends, In this article I will be talking about how you can implement GCM in Android using FirebaseMessaging Service. Below are the steps you need to follow… Create Project in Android Studio Create a new project in Android Studio. The package name we use here will be used in the Firebase Console. Create Project in Firebase Console… Read More »

James