Function Call In React Native



While a framework like PhoneGap works by wrapping web content in a WebView resulting in UI elements that don't quite have a native feel to them, React native uses JavaScript components backed by native iOS or Android components so the app you build is fully native. In part one, learn the benefits of supporting offline functionality, and some general tips for implementing it well. 2 days ago · Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. React Native "Reducers may not dispatch actions" when caling async function from componentDidMount() (self. You can also use an ES6 class to define a component:. `await getJSON()` means that the ‘console. This tutorial will show you how to build your own realtime Android and iOS chat using React Native, Gifted Chat and Pusher Chatkit. Here, I will try to go over a few examples of what you can do with the Navigator and explain how it all works in depth. React Native + Firebase #6 Send Push Notifications ( Expo + Firebase Cloud Functions) Learn how to automatically send push notifications in react native using Firebase Cloud Functions,Firebase. React Native - Props - In our last chapter, we showed you how to use mutable state. React Native Popup Dialog. iOS and Android don't know that there's this JavaScript engine that's a part of React Native, which is making calls through this bridge protocol to the Native modules. You call store. Building the App. you can also check this link for the more information about the Fetch API. On my Login Component, I have a renderForm function that is trying to determine if we should show the loginForm or the forgotPasswordForm , which I assume. Networking is an inherently asynchronous operation. text - flat button without background or outline (low emphasis) outlined - button with an outline (medium emphasis) contained - button with a background color and elevation shadow (high emphasis). Most users interact with mobile through touches. Or maybe you meant to call this function rather than return it. I highly recommend going through the documentation for this one since the way lists are rendered in React Native is actually quite different than the way you would for React on web apps. Modules written by Objective C can be compiled to React Native and run. This is very similar to the way that the normal Animated library works from React Native. In this function, you must create and return some subclass of UIView. In this React Native tutorial you'll learn how to build native apps based on the hugely popular React JavaScript library. Currying (partial function application) is a functional programming use case for call and apply. me/sunlight4d SUBSCRI. import { NativeEventEmitter, NativeModules } from ‘react-native’; const { StatusBarManager } = NativeModules; From here, it’s actually pretty easy — you just use the imperative API and call things such as getHeight: a function with a callback that you use to…, well, get the status bar height 😝. Otherwise, you need to link those libraries to your project. With React Redux, your components never access the store directly - connect does it for you. You can assign a different this object when calling an existing function. React Native set InputText Type Style Password for android and ios, In this tutorial explain how to add password type style on InputText in react native. Fetch is the best Promise based API that works fine with React Native. Each module holds a different task and it reduce the code redundancy. Fetch POST Request Syntax. 0 since versions above depended on React 0. React Native + Firebase #6 Send Push Notifications ( Expo + Firebase Cloud Functions) Learn how to automatically send push notifications in react native using Firebase Cloud Functions,Firebase. You should either call this method from componentWillUnmount or check to ensure that the component is still mounted within the delayed function. React Native, as the name implies, builds upon React. To make a Phone Call from React Native App we will use react-native-phone-call. How To Use ES6 Arrow Functions With React Native When producing React Native applications, you’ll often need to iterate over data to render components, where you’ll need to pass a function as a property for later execution. (but binding to this on the component call will create a new function each time the parent renders so if the performance matters you should use one of the other ways of binding. React Native provides the Fetch API for your networking needs. On my Login Component, I have a renderForm function that is trying to determine if we should show the loginForm or the forgotPasswordForm , which I assume. React Native: Custom component w/ a function in a prop - Maximum call stack size exceeded (React JSX) - Codedump. react-native-gifted-chat, which provides a customizable and complete chat UI interface; react-native-dialogflow, which will help us bridge our app with Google Dialogflow’s SDK; Getting Started. The life cycle methods is the inbuilt function created by react native, These function will execute according to user requirement and execute at a particular steps of application. Because of this, you will need to force version 3. However, at some point of your project you might need to call native functions. It’s important to understand the React part in React Native is one of its core features. In the article, we learn about React Native – Fetch POST Request | Submit Form With Fetch POST Request In React Native. render() { return React. But if I bind _func2() to component context when I call _func2(), problem will be solved. In this article, we learn about React-native - Fetch POST request registration form, on the last post we created on registration form UI so we going to use these registrations form here and using Fetch POST request to send data. You can use this to call setState before the initial render. For IOS & Android. Another similar dialog component: react-native-dialog-component the main difference is style. It provides its connected component with the pieces of the data it needs from the store, and the functions it can use to dispatch actions to the store. 0 as the one to be dependent on in your project. Unfortunately, depending on the side we are working on, we achieve the same goal in different ways. Other native methods. So to welcome you in this journey of learning react-native, we will be building a camera interface, together. React , Facebook's JavaScript library has proved tremendously successful around the web, including large companies like Netflix and Airbnb. But it's not immune of limitations. If you've used Snapchat or. React Native Scrollable Tab Header. If you like React Native Express, you'll love my new book, Fullstack React Native: The complete guide to React Native! Throughout the book, we'll build 7 full apps, covering complex topics like navigation, gestures, and native modules. x, the server became optional, but was still included in the package. Our variable is called count but we could call it anything else, like banana. In this React Native tutorial you’ll learn how to build native apps based on the hugely popular React JavaScript library. Rather than stubbing out function calls with empty functions, we updated all of them to render React elements. react-native-animatable is used to easily implement animations, and react-native-vector-icons is used to render icons for the expand page later on. Facebook offers the Button component, which can be used as a generic button. Front End Developer (JavaScript React Native). The componentDidMount() function is also needed, since it's called when the component is rendered for the first time. Refs are one of the only practical ways of doing this reliably. native extension can be used when a module needs to be shared between React and React Native. We have used an arrow function to define the function within the component. In order for Hooks to work, the react import from your application code needs to resolve to the same module as the react import from inside the react-dom. Developer can use this function to call some Native. How To Use ES6 Arrow Functions With React Native When producing React Native applications, you’ll often need to iterate over data to render components, where you’ll need to pass a function as a property for later execution. Function to be called when native code emit onPictureTaken event, when camera has taken a picture, but before all extra processing happens. The most common way to set state in React Native is by using React’s setState() method. The icon sets in React Native Elements are made possible through react-native-vector-icons. You can forward refs to class component instances, too. Mode of the button. (but binding to this on the component call will create a new function each time the parent renders so if the performance matters you should use one of the other ways of binding. https://www. shallow rendering comparison (test utils and Enzyme). (but binding to this on the component call will create a new function each time the parent renders so if the performance matters you should use one of the other ways of binding. Because of this, you will need to force version 3. Building React Native Apps with AWS Amplify Overview. js application. As we have access to the Angular component definition, we can look at the defined outputs and loop through each one and subscribe to it if there is a corresponding React prop and setup the chain to pass on the event. Then, we can call any exported native method as a normal JavaScript method from our React Native Component or library. Using React Native, developers can build performant cross-platform native apps much easier than ever before, all with a single programming language: JavaScript. How do I call _getData function in __onRegionChangeComplete function?. this refers to the current object, the calling object. Take a moment to familiarize yourself with App. Replacing Component: React Native Keyboard Aware Scroll View's KeyboardAwareScrollView. com In the last part, we successfully implemented the Modal view which represents the extended parking spot card information. In the project directory, make a new folder and call it src. What was a React-bound class system was slimmed down to a level where the pure JavaScript classes can be used. So when the page loads the both tabs componentDidMount function calls loadData function which fetches data from web. Created by Facebook, React Native projects favor teams with multiple JavaScript engineers. React Native lets developers build native mobile apps via And batched bridge-queuing native calls made it more difficult to have React Native apps call into functions implemented natively. In the react native you can use Fetch API for the networking request like GET, POST, PUT, DELETE. Reproduction Steps and Sample Code https://snack. These mobile apps are considered multi-platform because they're written once and deployed across many platforms, like Android, iOS and the web. Get the latest and amazing React Native Full App. The - (dispatch_queue_t)methodQueue method allows the native module to specify which queue its methods should be run on. Most users interact with mobile through touches. 2 days ago · Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. This works because custom Hooks are also supposed to only be called while a function component is rendering. React Native Meets Async Functions on The Exponent Log Great patterns for concurrency are one thing that make a codebase nice to work on. com and car icon from logomkr. If you are not a fan of React’s declarative nature, including JSX, its componentization, and data flow, chances are you are probably not going to be happy with React Native. While not needed in this getting started flow, Amplify provides React Native bridges when using the Auth category in the aws-amplify-react-native package. Redux) course featured in this preview video. This component helps you communicate with the native OS through some simple functions so you can use device hardware. Create a new project. I would like to use these functions which i have defined there in my Views. If you are creating server side app, you need to load data from a remote server. Setting push notifications in React Native. The methods described here are available on most of the default components provided by React Native. This is part three of a three-part series on getting started with React Native. React Navigation provides this for you, along with the iOS and Android gestures and animations to transition between screens. react-native-linkedin ★101 React-Native LinkedIn, a simple LinkedIn login library for React-Native or Expo with WebView and Modal; react-native-eval ★75 - Call any JS functions from your native code; react-native-device-log ★73 - A UI and service for displaying dev-logs on devices. In this article, we want to show how to setup and customize push notifications for iOS and Android in React Native. React Native Touchables. From a props point of view, a render props is just a regular function provided as props, and so the general advice apply: Don't create renderProps at runtime. A button is one of the components that work on its click. As the React Native team is working on the new architecture, there have been a few terms used to describe the various pieces. Initially, Facebook only developed React Native to support iOS. Go and make something useful and publish it!. Getting Started. Fetch is the best Promise based API that works fine with React Native. For React and React Native apps, the simplest way to add authentication flows into your app is to use the withAuthenticator Higher Order Component. MCS Group is seeking to connect with a Junior App/Mobile Developer - React Native for an established start up who set up in Belfast over 12 months ago. React Native was created by Facebook developers during a hackathon back in 2013. React Native - Props - In our last chapter, we showed you how to use mutable state. Many modules, including React Native core ones, declare variables that are kept in the main scope (e. react-native start. Nikolai asked “I’m curious how to make a basic audio player in React Native?A way to play from a remote location”, so here we are: Build a React Native Music App tutorial!. It should be initialized only once with new keyword and method destroy() should be called on its instance when user wants to deallocate all resources. In this part, you’ll learn how to use native device functionality in React Native. First, functions are first class objects in JavaScript. We have used an arrow function to define the function within the component. React Native Android module to use Android's Intent actions for send text to shareable apps or make phone calls or opening third party apps. Duplicate React. With the growing demand for apps and the increasing complexity that app development entails, React Native comes along at a perfect time. Receiving the intent data in React. `async` function returns a promise implicitly, and the resolve value of the promise will be whatever you return from that function. React Native Button. When go back to last screen that it will work and function will called with component will Mount. The then() function is called with whatever the return value is of the promise itself. We'll explore the concept behind child function components and how to add dynamic return values and hiding state management inside the component. In this guide we will call a function on screen focusing. React Native comes with React and react has its own Application Life Cycle Methods which is used in React Native. The major difference between React Native and React in the browser is that React Native does this by using UI elements of its platform, rather than HTML and CSS. js import FBSDK, { LoginManager } from 'react-native-fbsdk' and create a function called _fbAuth i start with _ to signify that it's a private method inside this function call logInWithReadPermissions form FB loginManage and handled the success and cancel state snippet looks something like. When building React applications, there are times when you'll want to calculate state based the component's previous. js-specific dependencies, it will run in React Native. The Scanbot SDK brings scanning and document creation capabilities to your mobile apps. In this guide we will call a function on screen focusing. Another pattern that you might use a lot when using React-Native are renderProps: providing as props a function that return a component. Chatkit is a Pusher service that allows Android, Swift, React Native, and web developers to easily implement various chat features such as message storage, typing indicators, and online presence. The core of every component written in React is the render method. We will go over how you can interop regular Javascript right in the JSX with curly brackets. React Native modules. When building React applications, there are times when you'll want to calculate state based the component's previous. Fetch will seem familiar if you have used XMLHttpRequest or other networking APIs before. React Lifecycle Methods: render and componentDidMount Methods is today's leading topic. react-native-animatable is used to easily implement animations, and react-native-vector-icons is used to render icons for the expand page later on. In the react native you can use Fetch API for the networking request like GET, POST, PUT, DELETE. Here's what you'd learn in this lesson: With the asynchronous actions created, Scott can update the Todo application to call these actions to load and create todo items. We’ll call it it GiftedChatWithChatkit:. We will learn how to pass props to JSX and how to override and props that get passed in. This will make a project structure with an index file named App. This is because the Apollo client will call the function once for the local optimistic write and a second time for the server response. This video guides you how to call Swift functions from React Native using Callbacks, Promises, Async-Await Support - https://www. However, if you're a Swift or Java engineer that still wants to write in their native language, React Native may not make much sense. js file and tab1. React Native Text Input. To make a Phone Call from React Native App we will use react-native-phone-call. 57 release of React Native! This release addresses a number of issues and has some exciting improvements. 60 you can skip this step. Unlike usage for the web, for React Native, we need to supply the onChangeText handler using handleChange with a parameter, the name of the field. Conversion of primitive types is straight forward. React Native has become a popular technology that offers a strong framework for building native cross-platform mobile apps using JavaScript, but you can also write native code using Objective-C, Swift, or Java when needed. Radio button group allows to control a group of radio buttons. Building React Native Apps with AWS Amplify Overview. which would again call this function, and on and on. What is React Native? React Native is a framework created by Facebook to enable a smooth and easy cross-platform mobile development. React Native vs Ionic is the biggest point of debate when it comes to evaluation of cross-platform frameworks. React Native supports multiple classes format like we used in other programming languages like Java, C++, PHP etc. Radio button group allows to control a group of radio buttons. React Native Text Input. This two-part seriesprovides an overview of the motivations and best practices for making offline-friendly mobile apps, accompanied by practical examples in React Native. Synthetic Events is a cross-browser wrapper around the browser's native event. 14, which is not 100 percent compatible with React Native. This video guides you how to call Native modules from React Native. Description. We believe this piece of tech to become preponderant within the years to come and want to take a pole position of React-Native specialist. This updates the state of count to 3 instead of 1. js file runs the Express function and all of the HTTP method routes are available for you to manipulate. To use the module, call the function with an object containing the number to call as a argument. This function would hold the event to defined time(In milliseconds-seconds) and than execute the Method. Getting Started. js then render() is the most used method. I got really excited about async functions back in 2014 , and it's great to see them land, for real, in browsers. You have to create the parent with a constructor, access to super method for extend well the Component Class, then export the parent class and extend it on the Class A where you have access to this functions by this context of the class. This module is useful when you need to share some text between apps in Android device and if you have a valid phone number make some call directly (if you ask. These subclasses are similar in function to view controllers, but are essentially singletons - only one instance of each is created by the bridge. Please follow Airbnb JS Style Guide. HTTP Get Request with Fetch API In React Native | Get With Fetch. To make a Phone Call from React Native App we will use react-native-phone-call. The application will contain a simple login system using an email address for each specific user. Read more here. react-native-linkedin ★101 React-Native LinkedIn, a simple LinkedIn login library for React-Native or Expo with WebView and Modal; react-native-eval ★75 - Call any JS functions from your native code; react-native-device-log ★73 - A UI and service for displaying dev-logs on devices. Modules written by Objective C can be compiled to React Native and run. this in doStuff will refer to the calling component Child unless you doStuff={doStuff. The "Calling Async Actions" Lesson is part of the full, React Native (feat. User can add custom styles while defining Content within their app. Calling React Native functions from native (events) The common pattern we use when embedding native in React Native is to make the native component's RCTViewManager a delegate for the views, sending events back to JavaScript via the bridge. React Native — Please check this post; Ionic React Capacitor Apps — Continue reading 😎 As you can see from above, there are several options available for Hybrid app development these days, and it is easy to get confused between them. Quick Summary :-Although, React Native is one of the hottest framework right now. For RN >= 0. Note: react-native-track-player is a streaming library, which means it slowly buffers the track and doesn’t know exactly when it ends. React Navigation provides this for you, along with the iOS and Android gestures and animations to transition between screens. This function is frequently invoked when states or props. We also have the Context API to avoid prop drilling and pass the state down many levels without passing it. Import StyleSheet, View, Alert, Platform and Button component in your project. SYNTAX- In ES6: using ReactJs: let a=[1,3,5,6,2] a. React Native Button. As soon as the button clicks, buttonClick function is called and from that buttonClick function we can call the native method ‘getThing()’ similar to ‘NativeModules. From a props point of view, a render props is just a regular function provided as props, and so the general advice apply: Don't create renderProps at runtime. A React Native Popup Dialog. 0) C++ ::: Cannot call error, as instructed to in Stroustrup's book. With the help of this example, You can provide one tab call feature to the users of your application. Please follow Airbnb JS Style Guide. me/sunlight4d SUBSCRI. In React Native, invoking a native function is called bridging. I have a Login component and then two seperate form components for loginForm and forgotPasswordForm. Content takes in the whole collection of React Native and NativeBase components. results matching ""No results matching """. Let's call the first an "Event Callback. React Native Button is a basic component that works by clicking on it. For IOS & Android. bind(this)} when you call Child in the render function of Thing. If you choose to customize the Lambda function, you can update it in the cloud using amplify push. Networking is an inherently asynchronous operation. Initially, Facebook only developed React Native to support iOS. React Architecture Life Cycle of components 74 Component Lifecycle A multi-screen mobile app 75 React Navigation Reusable react component Development Build Reusable React Native components 76 Component Reuse Reusable react component Code Reusability Kitchen sink of React native components 77 React Native component Library UI design using. React Native uses JavaScriptCore in iOS to run JavaScript (Android and other platforms will be supported in the future). Please note that all of my subsequent examples will be using React Native to demonstrate. It’s a perfect fit. Conversion of primitive types is straight forward. Modules written by Objective C can be compiled to React Native and run. This video guides you how to call Swift functions from React Native using Callbacks, Promises, Async-Await Support - https://www. As we have access to the Angular component definition, we can look at the defined outputs and loop through each one and subscribe to it if there is a corresponding React prop and setup the chain to pass on the event. React Native is a multi-platform solution developed by Facebook that lets you build mobile apps using JavaScript. Description. These subclasses are similar in function to view controllers, but are essentially singletons - only one instance of each is created by the bridge. sometime you will need to call parents function on react component, the problem in ES6 is that all functions are not bind with this, so you will need to do manually, below is a simple toggle function that you will call from Child component, notice that in order to call the parent's method, you will have to pass in the function as a property. results matching ""No results matching """. Example to Call Functions of Other Class From Current Class in React Native. ReactJS Constructor Tutorial Example is today's leading topic. In this tutorial, we will see how to Integrating React-native apps with back-end code using fetch API. React Native invokes native modules methods on a separate serial GCD queue, but this is an implementation detail and might change. It's React Native's job now to find changed parts of UI on each state update and to redraw only them. For native - we use events mechanism to schedule an execution of a handler function in JS, while for React Native we directly call methods exported by native modules. Follow the instructions in React Native's Getting Started guide to create a basic React Native project. The render method contains Simple navigator which passes navigator and firebaseapp as props to other components. React Native supports multiple classes format like we used in other programming languages like Java, C++, PHP etc. This is useful for making additional API calls when a user revisits a particular screen in a Tab Navigator, or to track user events as they tap around our app. I highly recommend going through the documentation for this one since the way lists are rendered in React Native is actually quite different than the way you would for React on web apps. In this tutorial, you are going to build a chat application using React Native, Expo, and Firebase as the backend service. When go back to last screen that it will work and function will called with component will Mount. Replacing Component: React Native Keyboard Aware Scroll View's KeyboardAwareScrollView. See the reporting handled exceptions guides for iOS or Android for more information. In my next blog, I will talk about the SectionList component. From a props point of view, a render props is just a regular function provided as props, and so the general advice apply: Don't create renderProps at runtime. If you're on a vanilla React Native project, you also need to install and link react-native-vector-icons. How should I hook up Redux Saga’s Event Channel with React Native’s Network(NetInfo) API?. Here, I will try to go over a few examples of what you can do with the Navigator and explain how it all works in depth. What makes React Native different from other frameworks such as PhoneGap (Apache Cordova) or Appcelerator Titanium, that use JavaScript to create iOS apps? (Unlike PhoneGap. The major difference between React Native and React in the browser is that React Native does this by using UI elements of its platform, rather than HTML and CSS. This will explain you how to use helper or injectable functions. In my recent experience, getting started with React Native testing is a little rough since tpopular tools aren't great for integrated testing. js in your project directory. Rather than navigation & container in one, this solution's intent was simply to create a navigation tool. In this React Native tutorial you'll learn how to build native apps based on the hugely popular React JavaScript library. Swift Modules for React Native January 6, 2016 2018-07-10T15:44:07+0000 JavaScript React Native is an Objective-C application framework that bridges JavaScript applications running in the JSCore JavaScript engine to iOS and Android native APIs. Custom Hooks may call other Hooks (that's their whole purpose). Components - The Building Block. post() in your React app corresponded to the app. A button is one of the components that work on its click. I am new on react native and came accross this problem. The map() method creates a new array with the results of calling a provided function on every element in the calling array. react-native init ProjectName --version [email protected] This will make a project structure with an index file named App. io/ry1B5ZR2g Solution What needs to be done to address this issue?. What I want to do is to call another function or update the state, after the request is over and data is ready. native extension as well. If you have used class methods in React Class Components before, this way of defining functions inside a React Function Component is the equivalent. js then render() is the most used method. We can run through the details and if you like what you hear we can work towards processing an application. Using React Native, developers can build performant cross-platform native apps much easier than ever before, all with a single programming language: JavaScript. post(path, function(req, res){}) code in this Lambda function. If we are talking about lifecycle methods in React. Go to the root folder of your React Native Project. If you are not a fan of React’s declarative nature, including JSX, its componentization, and data flow, chances are you are probably not going to be happy with React Native. Since the arrow function is being defined inside `render`, a new function will get made every time this component is re-rendered. Please follow Airbnb JS Style Guide. 0 on GitHub (npm) Changelog Welcome to the 0. Import StyleSheet, View, Alert, Platform and Button component in your project. React Native set InputText Type Style Password for android and ios, In this tutorial explain how to add password type style on InputText in react native. Here, I will try to go over a few examples of what you can do with the Navigator and explain how it all works in depth. A CountDown Timer is the reverse of the timer we usually see. There are combinations of gestures that work on it, such as tapping on the button, zooming the map, scrolling a list, etc. The Facebook SDK for React Native is a wrapper around the Facebook SDKs for iOS and Android, allowing for Facebook integration in native apps. Since we have Java<->C data conversion set up for our types, we just need to make a JavaScript<->Java conversion. native extension can be used when a module needs to be shared between React and React Native. results matching ""No results matching """. Read more. This function would hold the event to defined time(In milliseconds-seconds) and than execute the Method. In order to get started, the first requirement to use react-native-cli and create a new project directory. Prior to v4, @storybook/react-native included a built-in server and needed that server to function. Function to be called when native code emit onPictureTaken event, when camera has taken a picture, but before all extra processing happens. With the help of this example, You can provide one tab call feature to the users of your application. js import FBSDK, { LoginManager } from 'react-native-fbsdk' and create a function called _fbAuth i start with _ to signify that it's a private method inside this function call logInWithReadPermissions form FB loginManage and handled the success and cancel state snippet looks something like. Part-Time React Native Programmer for iOS/Android (Position Is Remote & 1099) ChopDawg. Hi there, i have implemented a ApiHandler Class which has several POST/GET/CREATE functions, using superagent. Read more here. 60: The latest version of React Native handles various crucial migration for both Android and iOS platforms, and the other small issues in the older version 0. Simple chat app with React Native — Part II. In the previous section, ["Hello React Navigation"](hello-react-navigation. I've been playing around with React Native a bit and found myself wishing for more documentation, especially with Fetch. A React Native Popup Dialog. To install React Native follow the installation guide here. But you'll likely want to do something by touch. Contents in this project Call Another Class Function From Default Class : 1. In React Native. Callback that is called when the text input's text changes. Our variable is called count but we could call it anything else, like banana. Initially, Facebook only developed React Native to support iOS. With Expo, developers can create React Native apps without all the frustrations that come with installing and configuring. Swift Modules for React Native January 6, 2016 2018-07-10T15:44:07+0000 JavaScript React Native is an Objective-C application framework that bridges JavaScript applications running in the JSCore JavaScript engine to iOS and Android native APIs. These app. connect() Overview. You call store. When react renders our stateless component all what it needs to do is just call MyStatelessComponent function and pass props there. However, at some point of your project you might need to call native functions. Set onPress onClick to Image in React Native using TouchableOpacity admin June 11, 2017 June 11, 2017 React Native How to add click listener on Image View and on onPress() method call function from same class and show alert message on application screen. Run and Test React Native and SQLite Offline Mobile App. Once you've done that. Hi there, i have implemented a ApiHandler Class which has several POST/GET/CREATE functions, using superagent. React Native is a great framework to develop mobile apps for iOS and Android with the help of JavaScript. The major difference between React Native and React in the browser is that React Native does this by using UI elements of its platform, rather than HTML and CSS.