With the age of digitalization and social media, everyone is hooked to their smartphones. With regard to which many big companies are restoring to mobile applications and a variety of online offers to easily reach to their target audience. In order to help such big companies publicize their brands, mobile application developers is a hot new job opportunity. Many big organizations are looking for candidates who are well versed in different platforms for mobile application development. Appcelerator is one of the recently and greatly used mobile developing platforms in a number of different organizations. Therefore, recruiters from big companies are looking for candidates with good knowledge and excellent hands-on training experience to fit perfectly into their work culture.

With the use of Appcelerator, such an organization has ease and edge over their competitors in the same market. Therefore, they are in a hunt for individuals who have the right technical knowledge along with adequate work experience. In order to find the right candidate, companies ask a diverse range of Appcelerator interview questions to not only the newcomers but also experienced candidates wishing to display their talent and knowledge in the field of mobile application development. Here are some of the important Appcelerator interview questions that will not only give you a basic idea of the field but also help to clear the interview and secure a position in your dream office.

Appcelerator Interview Questions

1) What is Appcelerator?

Appcelerator is a mobile development stage specially designed for big enterprises who are looking to make applications with cross-platform working using a single code database. It mainly utilizes Javascript code for developing powerful components.

2) How does Appcelerator work?

Appcelerator is a code interpreter. A developer firstly writes code using the conventional Javascript and then compiles it using an application with an Android or iOS operating system. After the application has compiled the code, Appcelerator’s native code that is included with the Javascript code interprets the initial code and commands it to a native language.

3) How is Appcelerator different from other mobile application developers?

Appcelerator has the capability to develop a native application using simple HTML codes within an application that gives it an edge over other mobile application developers. The platform used by Appcelerator allows its users to complete control over cloud analytics. In addition, it is an open source with a very large community of users, which allows finding solutions to any problem with ease and within a stipulated time.

4) What are some of the advantages of using Appcelerator?

Some of the advantages of using Appcelerator include the following:

  • It has an easy cross-platform development
  • From a single code database, numerous application can be produced that can run simultaneously on a variety of phones
  • It also allows the usage of the same application from different platforms

5) List some of the competitors of Appcelerator?

Some of the competitors of Appcelerator in the market include Xamarin, iFactr and Phone Gap.

6) What are the different types of mobile application development programs?

The three main types of mobile application development programs include:

  1. Native Apps: These applications are designed especially for specific devices. For example, applications for the Android operating system are written in Java. While on the other hand mobile application for the iPhone is written using Objective – C.
  2. Web Apps: These websites provide extensive interactivity that is similar to native applications.
  3. Hybrid Apps: Such applications use both the elements of native and web applications.

7) What is a push notification?

Push notification is a type of communication channel that allows an application to notify the user of a particular new message or a saved event without actually having to open the application. This can be easily achieved with a pop-up on the screen or with a sound.

8) What steps are utilized to introduce push notification using Appcelerator?

The five basic steps involved in introducing push notification using Appcelerator include:

  • Implementation of the cloud push module, which is achieved using the MQTT protocol
  • Retrieve a required device token
  • Login by the cloud user
  • Subscribe to a channel
  • The configuration of the push notification

9) What are some limitations of a cross-platform?

Some of the disadvantages of a cross-platform include:

  • It is heavy and requires a lot of space in comparison to native applications
  • Over layering of the native environment does not give control over the final code that will be generated
  • Cross-platform contains a lot of bugs that can eventually affect the productivity of the developer

10) Enlist some of the common challenges faced by mobile application developers

Some of the common problems faced by mobile application developers include

  • The market is loaded with a huge number of competitors
  • Self – financing can be an issue
  • Marketing of mobile applications is a herculean task
  • Client requirements based on different screen size and the device can be a hurdle
  • Application compatibility with different electronics and operating systems is a challenge
  • Security issues is another challenge faced by mobile application developers

11) How to provide security to mobile applications?

Security can be provided to various mobile applications by:

  • Protecting the network connection right from the back end
  • Putting different identification and authentication barriers at different locations
  • Implementing good customer data security by using numerous encryption policies for mobile applications
  • Having a strong API security strategy worked out at all times
  • Running a test on mobile applications at regular intervals
  • Spreading awareness to the users about protecting their devices

12) What are the procedures involved in publishing a mobile application either to the App Store or onto Google Play?

The steps involved in publishing a mobile application either to the App Store or onto Google Play include:

  1. Enroll in the developer program of either of the operating system and create an account
  2. Feed in different information such as application name, application icon, a short and brief description, ratings, keywords, copyright information, etc.
  3. It is then reviewed by the Apple or Google play company
  4. Finally, if there are not plausible rejections, the mobile application will get published

13) Why is it necessary to avoid global variables while using Javascript?

It is very important to avoid global variable while using Javascript to eliminate the risk of other scripts to overwrite a particular Javascript. It can result in maintenance issues and bugs.

14) How to avoid the usage of global variables while using Javascript?

Using the following coding, one can avoid using the global variable while coding with Javascript

var wrapperDemo= {
	x: 5,
y: function(myObj) {

15) Define the terms intent and activity with respect to Android

The intent is the interface that is utilized by a mobile application developer when he/she tries to introduce and launch a new user from one interface to another. The intent is basically a system message or an event that goes along with the data that has been utilized by the first user.

Activity is a component of an application that is used to display or highlight the interface of a user.

16) What are Appcelerator Cloud Services?

Appcelerator cloud services are a wide range of pre-built and automatically scaled network services that can be used by the iOS or Android native operating systems.

17) What is a memory leak and how can it be avoided?

Memory leak is a condition when a programmer who creates a memory in the heap forgets to delete it. It can be avoided by using the following coding:

/* Function without memory leak */
#include < stdlib.h > 
void f() 
   int *ptr = (int *) malloc(sizeof(int));  
   /* Do some work */  

18) Differentiate between native and hybrid applications

S.No Native Application Hybrid Application
1 It is expensive and time constraining to develop a native app It is cost effective and less time consuming
2 Provides good user experience and is compatible with a number of applications User experience is not easy under all platforms
3 Paid applications are developed using native platforms Free applications can be developed using hybrid platforms

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