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One feature of the Android OS is a great option to use as an alternative for your iOS app that might be too costly or complicated and too slow or complex for native apps to run on devices. This way you can easily generate code for your application, which adds more functionalities to the application. For example, in this blog, we will be creating a simple image gallery app using Reacts, by the use of react-android. We will create an interface with the main parts as below:
First of all, we will need to download some icons from our project (you can find them here). From the project folder, we will create 2 folders: src and android, both containing the necessary files: index.android.xml and src. The android folder contains all the required resources needed to make the application work and its main source for the application will be located in the android folder. The src folder contains just the HTML code and JavaScript files needed to display the basic aspects of the application. The js folder will contain the JavaScript file responsible for managing the back end, the front end, and the database of our application. Once you have installed these versions of your application you should open it in the Android Studio IDE, with Android Studio, or with Android Virtual Devices.
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The first step would be to convert the code from Java to Kotlin with the IntelliJ IDE plugin and then you will know how much code is written in the C# language. After this step, i recommend opening up your project folder and you should see the following directories present:
At this point, the only important thing I can do at this point is to build and open this application in my device and after this step, I advise you to keep in mind that the complete package with no bugs is not useful, always follow the links in your applications package, especially if you are working on custom applications. You should also add a logo to your application since by default it will appear when you open it in the browser. After adding a logo this way, once you close the browser, it should disappear in the background by default.
In this article, we are going to create two different types of applications. The first one will be a normal web application that uses jQuery, Reactjs, and most probably CSS to render the content, and the second one will include some kind of camera app that will be used to take pictures of certain objects that you want to capture. So let’s start with the web application which we will add to the list of components that will go into the final version of our application. If you can do the task then you can do that on your own and you shouldn’t need to read these lines anymore. Below are some examples of each of the modules that we will be implementing.
First we will be adding the React component to our web application; this component will receive input, make a request and send it down to the server and return the response. When the component is called it will look for the element that has been provided with the event object, which will be a URL from which to access the requested data. At the moment we don’t really care about the actual HTML code of the component but rather the JavaScript code of the widget, it will be the part that receives the request with one of those API’s like request Animation Frame and so they are the ones that will be called when the request is sent or received.
Our React module will handle the logic behind our navigation on the web page in order to move the user from the current page to another in the future. The HTML5 video component is the next component that we will implement because we need this type of functionality to show a live screen that appears immediately after the request is sent. On top of that, we will also add a button that enables us to enter the contact information in the form with a click of the button, this way we can avoid having to make those posts manually.
The React Component, the most difficult in terms of implementation will be the simplest component, if we can show an animated gif then we will be able to animate the animation and the users will be notified in real-time that something happened. Now we can choose which elements will be animated in our application and this decision will be made in React JS. We will choose the header bar element. In React JS when you click on the header bar then the header Bar element will not appear on screen, we will want the header bar to become active whenever there is some kind of clicking activity happening on the web pages. At first, we will have to make a special case of “header bar-header bar-visible” and the CSS style will be applied on this one to turn it off, just to give the impression that the header bar is actually visible but in reality, it is not.
The other types of components that you can implement would be the div or the ul which represents the menu that opens when the user clicks on the header bar, and then we also have the navbar. This bar contains some kind of list, it consists of a link to the homepage that we will be attaching a listener into the React JS React DOM to react to changes and then another to the navigation. We will attach a selector to the nav bar that will have the value “navb” and will be placed in the class called navbar that needs to work around it.
This part of the application is pretty straightforward. Firstly we will create a React JS file that will look something like this:
This file will contain our HTML code that will provide the text for our Web Application, the JavaScript that defines what happens when the request has been made and the JavaScript that will enable the React DOM in our console. It’s important to remember, however, that this folder has to be created inside the project folder because we will be making requests to it on every device, so we have to give it some permission. Next, we will install the react-navigation library. This library will allow us to navigate through the React JS app using the navigator object from the react-navigation library, but we have to register it. Then we will install the react-navigation library again.
Once that has been done, let’s create some HTML5 templates. The reason we are doing this is that we will find out later on, and later on when more people are buying our application and for that, we are going to use Google Fonts in our app, which means we will have HTML5 templates for our images, and we will have to change our CSS to reflect our new font. We will create a React JS file whose name will be react-navigation and from now on that file will have our routes. Those will be:
Our React JS will manage our routing and we all are going to write our JavaScript files next, to make our JavaScript code and JSX code easy to understand we will create a JavaScript file with the names react-navigation, react-navigation-navigation, and react-navigation-navigation.js. These files will contain our JavaScript and HTML code for our react-navigation and when the function called open Route will be triggered. After that, we have to select the HTML5 template that we will use to render HTML5 components.
Now we will create some JavaScript files that will handle routing, HTML5, cookies, network requests and will define when our React JS React DOM will occur. The React JS Re DOM will be responsible for handling the request and returning the correct response when the request was fulfilled. All the JavaScript will be stored in react-navigation-navigation.js. Finally, the react-navigation will manage our navigation in the application.
Next will the React navigation that will manage our navigation and make sure the route that we have defined is actually correct. The react-navigation will be the same we already wrote the React JS React DOM as before. The React navigation will look for the request’s navigation path and use it to make a request to the server that will return the correct payload with the correct content. There will be instances of and they will have the following attributes:
From now on our React JS React DOM will look for the React JS React DOM and whenever the request arrives, it will try to fetch some HTML elements and create some CSS classes that represent that HTML element and based on its CSS behavior we will decide whether to use it as an HTML5 component or not, to make it appear like there’s something on the screen that belongs to it or not. Here’s the React DOM React DOM will create a method called request Navigation on our React JS. After that it will ask the user for his/her mobile number and will request it until the server asks and the response is returned. If everything goes well then it will return the JSON response of the request. After that we need to get the JSON data back, this function will handle the request, and then the response is returned. This way we can make sure that the React DOM is the best option.
The last thing that we need to be aware of is the JavaScript libraries we will be installed in order to add new features and improve the JavaScript code. The React JS library is a JavaScript framework that allows the developer to add new features to their projects. The first step will be to register react-navigation-navigate-StackOverflow and react-navigation-StackOverflow-common packages. The react-navigation-StackOverflow package will be used to make the ReactJS project more modular and reusable. Because we will be writing several modules to manage some parts of our application we will need to make a folder in the root level called node_modules. The react-navigation-StackOverflow package will be used to make our ReactJS ReactDOM react to the navigation between our application and the server, and react-navigation
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