Build an Android App with JavaScript for Generating QR Codes



Root Android the Easy Way


Google’s Android operating system is riding a wave of popularity that hasrapidly eclipsed Apple’s iOS, and by the end of 2010 it’s expected to overtakeRIM’s BlackBerry as America’s leading smartphone platform. However, despitethe relative openness and flexibility of the OS, your Android phone stillisn’t as powerful and customizable as it could be. To unlock all of yourphone’s potential, you’ll need to root it.WARNING: Rooting–adding superuser capabilities to your phone by altering itssystem permissions–is an advanced technique that the inexperienced or faint ofheart should NEVER ATTEMPT. It’s hacking, folks, and if done improperly it candestroy your phone. Do not follow any of the instructions in this guide or onany of the linked sites unless you are comfortable with the very real risk ofturning your phone into an expensive brick. As of this writing, rooting is notsupported by any carrier or manufacturer, and will most likely void yourphone’s warranty. In short: This stuff is for big kids only. No whining ifthings don’t go your way.

Build an Android App with JavaScript for Generating QR Codes


We are back with yet another Android app demo. This time, we take a differentapproach to building an Android app with JavaScript.Being the de-facto programming language for the web, JavaScript has enjoyedtremendous growth over the years, especially in frontend browser-basedapplications. Thanks to the advances in runtime environments and the tooling,it is now possible to take JavaScript off the browser and use it in otherways. In this blog post, we show you how to build an Android app usingJavaScript and related web technologies, without using any native Java orKotlin based environments. We also show you how to integrate an API with suchAndroid applications by leveraging the power of the RapidAPI‘s APImarketplace.View the Best JavaScript APIs List

Building the UI Layer for Ionic Hybrid App


The Ionic framework offers a set of UI components that you can use to buildthe app UI.Like you use HTML tags to build the browser UI, Ionic offers high-level customtags to build the app’s UI elements.Here is how you can piece together an app screen to display a piece of smallinformation on a card.Using the tag, you can build this screen as follows. Destination Madison, WI Founded in 1829 on an isthmus between Lake Monona and Lake Mendota, Madison was named the capital of the Wisconsin Territory in 1836. In this way, Ionic provides a complete library of UI specific custom elementsto build UI screens for apps.

Making API Calls from Ionic Hybrid App


If you are using Angular as the base framework, then making an API call iseasy.Angular provides an HTTP client library for TypeScript that leverages theHTTPClient class.This class provides all the HTTP methods, including the most common ones,post() and get() to invoke API requests from an URL. Here is how you candefine a module to make a quick API call using HTTPClient and a few helperclasses. import { Injectable } from ‘@angular/core’; import { HttpClient, HttpHeaders } from ‘@angular/common/http’ import { Observable } from ‘rxjs’; @Injectable({ providedIn: ‘root’ }) export class HTTPService { // inject the HttpClient in the constructor constructor(private http:HttpClient) { } get(): Observable { let getUrl = “https://http://example.com/; return this.http.get(getUrl,{responseType:’blob’}); } }By importing this module in an Angular app, you can call the function get( ).It will return the HTML body of the example.com domain as a text blob.

Let’s create the app with Ionic Framework


We will now write the code for the Android app. To build this app using theIonic framework, you need to set up some tooling.First up, here are a few prerequisites for platforms and SDKs that must besatisfied before proceeding further.

Step 1: Create a new Ionic project


On the terminal, create a new project folder and then, while inside thefolder, create a new Ionic project using the Ionic CLI.This will create a new blank project called “qrcode.” It automatically createsthe project main folder named “qrcode” and the subfolders within.

Step 2: Add a new HTTP service to the project


For triggering the API calls from the app to the QRickit API, we define a newservice. Invoke the following command using the Ionic CLI. ionic generate service HTTP — A service is an add-on module, used as a library across the code. It performsa well-defined responsibility. In this case, it is the invocation API calls.You will define the logic inside this module in a little while.

Step 4: Add the code for HTTP service


Open the file http.service.ts under /qrcode/src/app path and replace theexisting content with this code. import { Injectable } from ‘@angular/core’; import { HttpClient, HttpHeaders } from ‘@angular/common/http’ import { Observable } from ‘rxjs’; @Injectable({ providedIn: ‘root’ }) export class HTTPService { // inject the HttpClient in the constructor constructor(private http:HttpClient) { } get(url:String): Observable { let getUrl = “https://qrickit-qr-code-qreator.p.rapidapi.com/api/qrickit.php?d=”+url; // create headers and set host and api key (obtained from RapidApi) const header = new HttpHeaders({‘x-rapidapi-host’:’qrickit-qr-code-qreator.p.rapidapi.com’, ‘x-rapidapi-key’:’‘}); // result is in the form of image in blob return this.http.get(getUrl,{headers:header,responseType:’blob’}); } }Before saving the file, make sure to replace the placeholder with the actual key generated for you during accountcreation.This service defines a get( ) call that wraps the HTTP GET method forinvolving the QRickit API. The API response is returned as a blob, which isthe base64 image data.

How to build Android apps with JavaScript?


The preferred development environment for Android app is Kotlin or Java, hencethere is no direct way of building an Android app using JavaScript. However,with the help of a framework, it is possible to add a wrapper over the nativeAndroid interface. The Ionic framework is one of the oldest and the mostpopular framework that leverages several web frameworks to provide thatwrapper. Apart from supporting vanilla JavaScript, which is still in beta, youcan use Ionic with Angular and React to built a hybrid wrapper over Android.

Android FTP server write permission


Step 3: After clicking on Add new option select the burger icon from the leftside and select the phone storage and then tap “Select”.Step 4: After selecting the check the writable box to give permission to FTPclient users to file write permission.

Start Smartphone FTP Server


Step 5: After configuring the Users, all the users can see under UserManagement. If you are not connected to any WiFi router then please on theHotSpot of your phone and connect the laptop or PC with that. If you want toaccess the server remotely via the internet then switch on the mobile data andthe FTP server will automatically detect the public IP. In the same way, ifyou are connected to WLAN via some router then the app will provide you withan IP address of your local network.Note: Over mobile data, you connect to the server from any network using theInternet but for locally WLAN both the FTP server and Client should be in thesame network or IP range.After connecting the PC to the Android phone via hotspot, now it’s time tostart the FTP server. For that go to HOME and tap the START button. Once theFTP server starts you will get an IP address to access the FTP server. Likehere we get the below-given address.ftp://192.168.43.1:2121You can also use this ftp://192.168.43.1:2121 address of yours directly intoyour browser and you don’t need to follow other instructions. But for propersetup, we recommend you also perform the rest of the steps.

Access Android Phone FTP server wirelessly by another Android Smartphone


using the EFSfileExplorer app 1. Open the ES File Explorer File Manager app and tap on the hamburger icon given at the left side top. 2. Tap on the Network option and the FTP 3. Select the FTP and add a new FTP server 4. Under the New FTP Server add the Ip address of the Android FTP server as shown in the screenshot. After that Tap, the ok button and you will get a shortcut folder of the storage mounted on the remote FTP server of your Android phone.VIDEOOther Articles:”

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