React Native is an open-source framework for creating mobile applications developed by Facebook, released in March 2015. It allows developers to use React and other native platform abilities for both mobile and web applications. As React Native is built on ReactJS and Javascript, developers who are familiar with such languages may prefer it over other frameworks.

Flutter is an open-source UI software development kit created by Google, released in May of 2017. It's used for both mobile, desktop and web applications, all from the same codebase. Based on the object-oriented programming language Dart, those with a preference for those types of paradigms may prefer Flutter.

While Flutter comes with its material design guidelines, one may be inclined to use it. However, there's no inherent problem with not using it, as Flutter was created with a custom brand design in mind. It just happens to have some material design as a bonus.

Most popular between React Native and Flutter :

To give you a few experiences on how famous the two systems are, here's a realistic showing the quantity of inquiries on StackOverflow that React Native has contrasted with Flutter. As should be obvious, Flutter quickly acquired foothold, particularly beginning around 2018, in a way that since the finish of 2019, StackOverflow has had a larger number of inquiries posed with regards to Flutter than React Native. Shudder turned out to be somewhat more well known as Google has been putting a great deal of time into it.

The fact that it is derived from JavaScript makes it simpler to learn and explore than other dialects. You are able to deal with advancement more directly. Since JavaScript is certifiably not a serious language, this simplicity may come at the expense of numerous mistakes individuals may make in their code, in runtime. As a result, Facebook, React Native's maker, recommends Flow. A JavaScript commenting system provides methods for gathering types and recognizing unfortunate behavior, which helps relieve this problem by identifying problems as the code is being written.

In a vacuum, Flutter is not as easy to learn as React Native. Nevertheless, a background in either Dart or any other Object-Oriented Language will make your life easier. Due to its increase in popularity, finding help online is quickly done and hardly any trouble.

React Native vs Flutter: key differences :

Components in React Native are equivalent to those in React's web counterpart. There is a Span in React that is a Text in React Native, which is what would be equivalent to UIView in iOS and TextView in Android if React were an iOS app.

Two threads are intrinsic to each React Native application:

The main thread runs a standard native app, handling the display of elements and processing user gestures.

A second approach executes JavaScript code into a separate engine, either JavaScriptCore or V8, which handles the application's business logic. It also defines the functionality and structure of the user interface.

These threads never communicate directly or block each other.

Flutter has widgets, which are similar to iOS's UIView and Android's View, but are not quite identical to the partners previously referred to. The first thing you should know about them is that they have a different life expectancy: they are unchanging and exist until a change is necessary.Flutter's system will make another arrangement of gadget cases when that happens. Examined views in iOS and Android are rendered once and only redrawn when setNeedsDisplay() and discredit() are called separately.

By having such a system, engineers can forget about the need for references to the devices, and work with the backend construction in one language.

UI Components are crucial when developing cross-platform mobile applications. Therefore, both frameworks must provide smooth and easy API access to native modules. In this regard, React Native has fewer components than Flutter.

On the one hand, React Native is very dependent on third-party libraries to obtain native modules. On the other hand, Flutter has UI widgets integrated; thus, the developer does not have to search for third-party libraries.

JavaScript is used by React Native and Dart is used by Flutter. JavaScript is a dynamically typed language that has been popular for years, and it is often used with React, but it can also be used with other JavaScript frameworks. Many developers are familiar with JavaScript, so adopting React Native is pretty straightforward.

Contrarily, with Flutter, developers necessarily have to learn Dart, which is not a very used language. However, it is not a puzzle either, considering that its syntax shares many similarities with Java and JavaScript.

Hot reloading is a feature of Vacillate, allowing designers to seamlessly infuse new code into a running application, thereby reducing time and speeding up improvement. As an additional advantage, hot reload keeps track of the application's state to avoid losing anything during reloading.

Respond Native was incredibly mindful of the achievement of this component among engineers and its 0.61 rendition was dispatched with a "quick invigorate" highlight that relates to the "hot reload". "Quick invigorate" further permits the designer to see changes made in the application without having to recompile it. 

Using React Native has also the advantage of having a large local community of designers who have contributed numerous libraries. The libraries can be used to assemble blocks and therefore accelerate the improvement process.

Ripple has an exceptionally exhaustive and broad documentation, giving engineers itemized guides and instructional exercises. Besides, Flutter also incorporates the Flutter assessor and debugger to help designers all through the application advancement. 

Respond Native's documentation is additionally exceptionally rich and gives numerous instructional exercises, libraries, UI structures, articles and different materials. Further, it benefits from having an enormous local area and being essential for the React family. 

On the inverse , Flutter doesn't (yet) have such an enormous local area of designers, taking into account that it is as yet a genuinely youthful structure. In any case , it has accomplished an extremely conscious size, depending on a ton of help from individual engineers, and it is progressively turning out to be more famous.

On the one hand, React Native demands a third-party solution to automate delivery and deployment, which means it does not provide developers with a CI/CD solution for Google Play Delivery or App Store.

Flutter, however, allows developers to build and deploy Android and iOS apps using the command-line interface (CLI). Nonetheless, if advanced automation is required, third-party solutions may also be required.

As part of my learning experience, I worked with both frameworks to develop an application called Dwipper, where users post their shower-thoughts as Dwipps.

Basic login, registration and forgot password

My Dwipps, where you can see all Dwipps you posted

Change password, where the user can change their password

To me, this was a great learning experience. Flutter felt more intuitive, like how you work with widgets felt simpler than components in React Native. The only real issue we initially had was communicating with the app's backend. It wasn't something directly related to the framework itself, only a matter of figuring out what and how to send.

Using React Native, on the other hand, was more challenging due to my lack of experience with JavaScript. Most frustrating was setting up the navigation between the login part of the app and the "real" part. Having to install a new component each time we needed something for a specific task wasn't very pleasant.

As Ionic was initially released all the way back in 2013, it lags behind Flutter slightly. If the developer isn’t sound in JavaScript, CSS and HTML5, the ramp up time for proficiency will cost time and money in learning the framework, while Flutter has a smoother learning experience. Being able to hot reload for quick experimentation allows for faster development as well.

When comparing React local with Ionic, we can say that Ionic has excellent documentation and its devices are well known among web engineers. Due to its dependency on a program, the code can only access local elements with a lot of effort.

Respond Native, on the other hand, has a major local area backing it up, which leads to more issues and the need to resolve them by different engineers. Respond Native is converted into local code, having the option to arrive at 60 casings each second effectively, as though it's a local application. In any case, it is supported by a major organization, implying that any new apparatuses might be delivered by said organization's necessities.

 which one is better between React Native and Flutter:

Toward the day's end, when asking yourself which one is awesome, Flutter or React Native, everything boils down to individual inclination. 

Those familiar with JavaScript or React will certainly enjoy React Native, since the transition is relatively smooth. On the other hand, designers who subscribe to the Object-Oriented worldview will undoubtedly enjoy using Flutter.

You should seriously consider utilizing Flutter if you want to create a durable application that's more complex than Dwipper, since it's somewhat better known at this time than React Native. TFame may prove useful when bug-hunting your application. Since there are more people, there are a greater range of issues, which increases the probability of finding someone with the same issue as you or having it resolved by somebody in the area who has had a similar issue before.

The following blog post will discuss React Native and Flutter, their key differences, and the benefits of using either one.



React Native vs  Flutter for  app development

React Native is a JavaScript framework for writing real, natively rendering mobile applications for iOS and Android. It's based on React, Facebook's JavaScript library for building user interfaces, but instead of targeting the browser, it targets mobile platforms.

Expo is a platform with a set of tools and services built around React Native and its ecosystem that help us develop, build, and quickly deploy IOS and Android apps.

It allows us to have a shortcut into the native setups, handling the binaries and letting you with the JavaScript code. Expo also helps us test the mobile application in IOS devices, as I will discuss later in this article.

5 common errors found while creating a React Native mobile app

As we referenced above, we utilized Expo to channel the super normal issues from React Native. 

In case you previously worked with React Native previously or on the other hand assuming you're going to construct your next portable application utilizing this library, you're probably going to track down a couple of issues. Here are the best 5 ones we experienced and how we settled them:

In the first phase of our app, everything was running smoothly, as we were just testing everything on IOS (we didn't have plans to run the app on Android devices). In the second phase, we were told that an Android version was also needed. While we rested our minds assure, as the tool we chose could make that happen, problems started to appear.

The first run on the Android Emulator did't work as we expected. As we were going through the debug (which was very hard to do due to the lack of debug support), the Android Emulator broke and didn't show the error message. We figured out a way to capture the error message by recording the screen. This led us to discover that the change of the style that was made dynamically to handle the animation of the elements in the Login screen, doesn't work on Android the same way it works in IOS. Android does not support flex transformations. We were changing columns to rows, so we had to change our approach to be able to have this animation working properly on IOS and Android.

Before using Expo, the best way of handling errors was the one well known by the JavaScript ecosystem: to delete the node_modules and rebuild all over again, including the natives code. Fortunately, with Expo, we didn't need to handle all IOS and Android native builds that React Native requires. We just needed to run expo build:android or expo build:ios to have the app up and running as we expected.

When you're writing code in a cross-platform tool, you can assume that the app would behave the same way in both platforms. While this shows as true for most of the cases, we discovered some main characteristics in our development that were tricky to address. For example, the box-shadow and some libraries, like will mention in the next section, don't work as expected on Android devices.

If your app requires deep native functionality, most of the time, your team will need to work with native code, as shown by Airbnb in their article.

One of the biggest challenges faced while building this mobile application was how to manage the image assets. We decided to use the SVG format with one of the most used libraries, react-native-svg. Since the app had a lot of complex draws, we used SVG to avoid losing quality. Turned out that the library to handle SVG was not working on Android the same way that it works on IOS. In some cases, it didn't work at all with some images not showing after the build. We had to look for a solution which we found in the documentation: it was needed to distribute the images as static resources and use the native way of handling images. That means choosing the right one by the screen density.

During the mobile app development, we also had to deal with box-shadow handling. While IOS behaved normally, (with one web page having several ways of styling the box-shadow) Android had just one prop. It's called elevation and has just one control over the depth of the shadow. Again, another adjustment on the components to be able to emulate the box-shadow effect. Here we used some transparent PNG to emulate the box-shadow transparency on our screens.

To be honest, conveying and testing portable applications are not React Native issues per si. The test to have an application running in a customer's cell phone before the authority organization into the stage, is notable. At our improvement stream, we have picked Expo for its straightforwardness, to ease process. Our partners set an emulator on their machines (inside the main essential of being a MacOs gadget) and after the improvement run of the application, they could test the application. To have the application dealing with their gadgets, we needed to run exhibition build:ios - t 'test system' - discharge channel organizing (which produced one .ipa document fit to be introduced into the gadget emulator) and exhibition build:android - t 'test system' - discharge channel arranging, an .apk record that could likewise be introduced on an emulator or on a genuine gadget, since Android is more adaptable with regards to applications being introduced on their framework. 

Exhibition comes as an incredible assistance when we really want to fabricate portable applications, as it permits to smooth out React Native intricacies. In spite of its cons, it facilitates the progression of making portable applications, further developing the testing system. 

The Expo moves begin to seem when your versatile application begins to develop and its functionalities become more mind boggling. Despite the fact that you might observe a few issues as the ones we've referenced above, React Native is an incredible system. Truth be told, it shows as one of the greatest cross-stage systems with an extraordinary environment of libraries, instruments, and obviously, a monster behind it: Facebook. 

By consolidating it with Expo, we can deliver magnificent portable applications to our clients, with a little group, in record time. Every one of the blunders found while making this React Native portable application could be settled with the fundamental investigate time and local area help.

In this blogpost, we will know the 5 common errors found in a React Native app.+

5 common errors  found in  a  react  native app(using  expo)

Flutter, a UI software program improvement package via google is understood for building remarkable, natively compiled apps for the net, cellular, and laptop the use of an unmarried codebase.

Flutter turned into initially an open-source challenge for mobile software development. Later it became prolonged to support systems like the internet, home windows, google fuchsia, and Linux. You might be already aware of google’s new operating machine known as fuchsia. Here, flutter is the primary source for developing its applications.

React native is a javascript framework for writing actual, natively rendering cell programs for ios and android. It’s primarily based on react, facebook’s a javascript library for constructing user interfaces, however in preference to targeting the browser, it targets cellular platforms. In other words: net developers can now write cell programs that appear and experience surely “local,” all from the consolation of a javascript library that we already know and love. Plus, because the maximum of the code you write can be shared among platforms, react local makes it clean to simultaneously develop for both android and ios.

Flutter is faster than many other application development frameworks. With its “hot reload” feature, you can experiment, build UIs, add/remove features, test and fix bugs faster. Thus reducing the overall app development time.

You can build beautiful apps in Flutter. Also, the end-user experience is similar to native apps. Flutter has a layered architecture that lets you control every pixel on the screen. Thus, customization is very simple in Flutter. With its powerful composting capabilities, you can overlay and animate graphics, text, video, and other controls without any limitations.

You’ll also find a set of widgets that deliver pixel-perfect experiences on Android and iOS. It enables the ultimate realization of Material Design. Just in case you don’t know, Material.io is Google’s initiative to build beautiful, usable products with Material Components for digital experiences.

Flutter’s widgets incorporate all critical platform differences such as scrolling, navigation, icons, and fonts. This provides a native performance experience on both iOS and Android.

Dart programming language is developed by Google and is meant for mobile, desktop, backend, and web applications. It is a client-optimized language for fast-performing apps on multiple platforms.

Dart is AOT (Ahead Of Time) compiled to fast, predictable, native code, allowing writing almost all of Flutter code in Dart. This makes Flutter extremely fast and customizable. Virtually, everything (including all the widgets) can be customized.

Flutter framework supports many different tools including Android Studio and Visual Studio Code. It also provides support for building apps from the command line. Dart DevTools, which is a new debugging tool, is more flexible and allows runtime inspection. You can also view logs, debug apps and inspect widgets for Flutter App Development.

Popularity:- 68,000 Stars on Github (June 2019)	78,400 stars on Github (June 2019)

IDE:- Higher compatibility with IntelliJ idea, Visual code studio & Android studio	A wide range of IDE’s and tools support React Native

Documentation:- Clean and easy to follow	Unclearly

Stateful Hot Reloading:- Available	Available

Adaptive Components:- Components are not adaptive. Need to be configured manually 	Some are adaptive automatically

App Performance:- Higher at 60fps animation standard	Lower as it uses JavaScript bridge for initiating interaction

Native Appearance:-	Better as it has access to the device’s core functionalities, Less, due to its dependency on third-party

Top apps built using Flutter/React:- Xianyu app by Alibaba, Hamilton app for Hamilton Musical, Google Ads app	Instagram, Facebook, Facebook Ads, Skype, Tesla

Popularity:- 78,400 stars on Github (June 2019)

IDE:- A wide range of IDE’s and tools support React Native

Adaptive Components:- Some are adaptive automatically

App Performance:- Lower as it uses JavaScript bridge for initiating interaction

Native Appearance:- Less due to its dependency on third-party

Top apps built using Flutter/React:- Instagram, Facebook, Facebook Ads, Skype, Tesla

React native is an older framework that is pretty famous for its balance and growing time. But, react native and flutter framework have their very own professionals and cons. However, each is actively true looking at the capabilities they’re imparting.

React native sounds like a tooling and dependency nightmare, at the same time as flutter seems like pride however still struggling developing pains. From my revel in, many builders have expressed excessive frustration with react native at times. Also, builders have stated that it’s a pleasure to develop apps in a flutter.

In this blog, we will discuss why Flutter Framework is Better than React Native.

5 Reasons Why Flutter Framework is Better than React Native

React Native has emerged as a popular framework for developing cross-platform mobile applications. Its ability to leverage native components using a single codebase has made it a favorite among developers. However, like any technology, React Native can present its own set of challenges. One such challenge arises when the release APK of a React Native app fails to fetch data from the local network. This blog post will explore common reasons behind this issue and provide practical solutions to ensure seamless data fetching in your React Native release APK.

Fetching data from a local network is a crucial aspect of many mobile applications. During development and testing, React Native apps often interact seamlessly with local network resources. However, things can take an unexpected turn when the app is bundled into a release APK for distribution. The most common manifestation of this issue is the app's inability to fetch data from the local network, causing frustration for both developers and end-users.

Network Security Policies: One of the primary reasons behind this issue lies in the tightened security policies that are applied to the release APK. Unlike the development environment, where network requests might be allowed without restrictions, release APKs are subject to stricter security controls.

CORS (Cross-Origin Resource Sharing) Restrictions: CORS policies play a significant role in web and mobile app security. While a React Native app running in the development environment might not encounter CORS issues, the release APK could face restrictions when trying to access resources on the local network.

Network Permissions: Android and iOS platforms require explicit permissions to access network resources, including those on the local network. The release APK may lack the necessary licenses to make network requests.

To resolve network security-related issues, you can adjust the network security configuration of your app. In Android, this involves modifying the res/xml/network_security_config.xml file to include exemptions for local network resources. You can whitelist specific IP addresses or domains that your app needs to access.

    <domain-config cleartextTrafficPermitted="true">

        <domain includeSubdomains="true">your-local-domain.com</domain>

If your app fetches data via APIs or web services on the local network, ensure that CORS headers are appropriately configured on the server. Additionally, you might need to include CORS-related configuration in your app code, such as using the fetch API with the mode option set to 'cors'.

In Android, make sure your app's AndroidManifest.xml includes the necessary permissions for network access. You may need to add the INTERNET permission:

<uses-permission android:name="android.permission.INTERNET" />

For iOS, ensure that your app's Info.plist file includes the NSAppTransportSecurity key and allows arbitrary loads if your app is accessing local network resources without HTTPS.

Fetching data from the local network is a fundamental requirement for many React Native applications. While issues with data fetching in the release APK can be frustrating, they are not insurmountable. By understanding the potential causes and applying the appropriate solutions, you can ensure that your React Native app seamlessly fetches data from the local network in both development and production environments.

Remember that troubleshooting and solving such issues are integral parts of the development process. Staying informed about security policies, network permissions, and platform-specific configurations will empower you to overcome challenges and deliver a polished and functional React Native app to your users.

Troubleshoot React Native release APK's local network data fetching issues with security, CORS, and permissions solutions for seamless app performance.

Troubleshooting Local Network Data Fetching Issues in React Native Release APK

Even i was also searching this question on search engine..But,somewhere i have seen following code and it was worked for me..

You can use the injectedJavaScript or injectJavaScript method as per the documentation.

const getCookiesJS = "ReactNativeWebView.postMessage(document.cookie)";

onMessage={event => console.log(event.nativeEvent.data)}

source={{ uri: "https://www.example.com" }}

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Trending Blogposts on react native

React Native vs Flutter for app development

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