As of the third quarter of 2019, there were 2.47 million apps on Android’s app store and 1.8 million on Apple’s app store. Another data suggests that there are more than 12 million registered mobile app developers globally.
According to Statista, global mobile data traffic is projected to grow seven times between 2017 and 2022. More and more people are using the Internet through their smartphones and prefer mobile applications to mobile websites. This is because mobile applications are easily accessible, easier to use and fully customizable to individual preferences.
Step-by-Step Guide for Mobile Application Development
Whether you are a business looking to develop a mobile app to engage with your audience, mobile app developer building an app for a client or amateur dabbling with mobile app development out of curiosity, here is a step by step guide to walk you through the mobile application development process.
1. Have an App Idea?
Businesses of all sizes, from single-person company to a conglomerate, can benefit from developing apps that focus on different products and services. Whether you are in the retail business or banking and finance or education industry, all you need to build a mobile application is an idea to get you started.
You must brainstorm with your team or mentors so that you have multiple app ideas. Each app idea must be researched for feasibility, viability, and suitability in the target market.
2. Choose Device Platforms
As mentioned earlier, mobile applications have two major platforms – Android and iOS. The platform that you use should depend upon your business goals and what your intended customers are using.
Android platform is more popular than iOS because Google makes it available to companies developing or launching their own mobile phones. In contrast, iOS is available only on Apple’s own devices.
iOS platform provides better security and is perceived premium, so many companies prefer to launch their app first on the Apple Appstore. iOS apps have a higher entry barrier in terms of both entry fees and the expensive Mac devices you need to develop the applications.
3. Develop for both Android and iOS
It is definitely possible to develop for both Android and iOS. If your customers use both Android and iOS phones, you will need to develop an application for both platforms. When developing for both the platform you need to strategize and take an approach that allows you to reuse code, saving time and resources.
4. Select a programming language
After you have chosen the platforms for which you want to develop the app, you need to select a programming language. The most important criteria in selecting the programming language are the type of app you will develop – native, hybrid, cross-platform or progressive web apps.
Here are some popular languages for mobile app development:
- Swift and Objective-C for iOS native apps
- Java and Kotlin for Android native apps
- Xamarin, Flutter, React Native, etc. for cross-platform apps
Besides the type of app, you also need to take stock of existing skills and what can be upgraded quickly. It does not make sense to invest time and money in learning a new language from scratch when there are so many options available.
Depending upon the features of the app to be developed, one language might be more suitable than others. Look into the list of in-built and third-party libraries available to judge what suits you best.
Don’t be in a hurry to zero-in on a language. Weigh the pros and cons of each option before deciding.
Alternatives for Building Mobile Apps
Before the actual development process, you need to take quite a few decisions about the mobile app. The first one usually is the platform to be used to develop the application. After that, you can choose from any of the four different approaches to building mobile apps, all of which are discussed here briefly.
1. Native Mobile Applications
Native mobile applications use the operating system and frameworks provided by the app platform. Apps built using native language boast of:
- Faster development times
- Ability to build more robust applications
- Access to platform-specific features
- Better development experience
2. Cross-Platform Native Mobile Applications
You can also choose to build applications for anyone’s language and then convert the same codebase for other platforms. Such applications are developed using standard frameworks that would work on both Android and iOS platforms. Cross-platform mobile applications are compiled into a native application that runs on the operating system of the mobile device.
3. Hybrid Mobile Applications
Like cross-platform mobile applications, hybrid mobile applications are developed using frameworks that would work equally well on both platforms. They are not compiled into native applications but installed as bundles that run-in web containers when launched by the user.
4. Progressive Web Applications
As the name suggests, progressive web applications are not developed as mobile applications. They are web applications that give a feeling of a mobile application when accessed through smartphones. Progressive web applications are not launched and made available to the people through any of the app stores.
Comparing Native Apps vs. Hybrid Mobile Applications
You have an app idea, but you are confused about whether you should build native apps for both platforms separately or a hybrid one. Understanding your intended audience’s expectations from the app is key to deciding between native and hybrid mobile application development.
Consider the differences between them, which are listed in this table.
|Best runtime performance
|Unable to access native APIs, reducing runtime performance
|Direct access to device hardware
|Accesses device hardware plugins and native modules, which restricts the performance
|Separate codebases for each platform need to be maintained
|A single codebase that runs on each platform
|Uses platform frameworks
|Uses web frameworks
|The higher app-building cost
|Less cost as compared to native application development
Remember that if you prefer native applications, you can focus on one of the platforms and then convert the code to the other platform. You will need to redesign the interface because the two platforms are quite different when it comes to rendering the application on the users’ screens. Otherwise, if you choose your language and framework judiciously, you should be able to reuse most of the code.
How do Hybrid/Cross-platform Frameworks work?
There are two approaches to developing cross-platform applications:
- Use platforms like ReactJS and NativeJS that provide native modules for the cross-platform codes
- Use platforms like Flutter and Xamarin that compile the code into native code
Hybrid applications are best suited for smaller applications that do not need many resources.
Mobile Application Development Lifecycle
Mobile application development life cycle is not much different from software or web application development life cycle. It always starts with an idea that you must research to find its feasibility in the current market scenario. Once you are sure that your app will solve some user problems, you can go ahead with the actual development.
Wireframes and Prototyping
Before the actual coding begins, a lot of thought must go into what the app would bring to your users. Wireframes are a good way of understanding what your app would do and how. There are no design elements included in the wireframe. These are some of the information that must be included in wireframe so that all the stakeholders understand what they are signing up for:
- How the application will help the users
- User journey through the application
- Identify possible pitfalls
- The positioning of important menus and other navigation areas, content areas and other page elements
The wireframe is a two-dimensional depiction of your app. After creating a wireframe, you should include the design elements into it and develop a clickable prototype for the app. Prototyping allows you to get a look and feel of how the application would actually be used by the audience. It should include buttons that you click to go to other screens, as a real user would do for the app.
Defining the Frontend and Backend
Once you have the prototype ready, you need to define the front end and the back end for the app. The initial mobile applications were self-contained units that functioned on the user’s smartphones without any connection to the external world. However, as the availability of internet data increased, some of the data and functions could be offloaded to the back end on the cloud.
This need arose primarily because smartphones have fewer resources as compared to web applications. The mobile applications were shortened versions of web applications. But, if some of the features could be offloaded to the cloud, a fully featured mobile app could be a reality. And this is what happened with the increased availability of the internet and cloud storage space.
To improve their own efficiency and performance, developers started defining tasks that could be relegated to the cloud as backend.
Mobile Application Front-End
Mobile application front end is typically the user interface. The front end focuses on interface design and user experiences through awesome visual and interactive elements. When a user downloads the app, it is the front end that gets downloaded. It resides on the user’s mobile and can be accessed by clicking on an icon on the screen.
What a Front-end Development Workflow Looks Like?
Front end development goes through
Analyze –> Develop –> Test –> Release –> Monitor cycle.
The number of people involved in this workflow depends upon the size of the application. In case of a very small application all the stages could be handled by just one or two developers. But for enterprise-wide apps, dedicated teams could be handling each stage of the workflow.
Mobile Application Back-End
The back end of a mobile application could be maintained by the app owners or a third-party cloud service provider. With organizations adopting lean and agile development methodologies, developers prefer outsourcing backend to third-party service providers who are responsible for providing the infrastructure and maintaining it.
Back end development goes through
Analyze –> Develop –> Test –> Deploy –> Monitor cycle.
How Mobile Apps Integrate with the Backend?
The front end typically uses a programming interface is called APIs to connect with the backend. These APIs could be provided by the back-end service provider or developed in-house. Developing in the house is becoming rarer as fully customizable software development kits (SDKs) are easily available for use. There are a wide range of APIs available and even more variety of ways in which they are accessed.
How to Interact with the Backend Data?
Back end data typically stores user information on the cloud rather than the device itself. This makes the app lightweight but increases the time lag between request and response. Developers need to program the APIs in such a way that users do not feel the lag due to the data source being away from the device itself.
Test Locally, Test Globally
As mobile applications are no longer confined to the users’ device, developers need to test the app both locally and globally. Local testing ensures that local servers are working properly, and users are getting the awesome experience that the app was designed for. It also checks the APIs responsible for the integration of front end and backend.
Global testing is required for applications that offload their backend to cloud, the most common scenario in the current mobile app development ecosystem.
Publish Your App to The App Store
To publish your app to the app store, you must join the App store’s developer program. Once you join the program you get access to native APIs, beta releases and proprietary frameworks. Follow the store guidelines and benchmarks to develop quality applications.
Android developer program can be easily joined if you already have a Google account. Google play store is not very strict about app distribution. You can distribute the apps outside the store and let the users directly download and use them.