Android Developer – A Complete Roadmap

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The Android ecosystem is always advancing: new libraries and materials are released every day with the goal of speeding up development and making our lives as developers easier.

Android is an open-source operating system based on the Linux kernel that runs on smartphones, tablets, and other mobile devices. It was also created for smart watches and Android TV. Each one has its own user interface. Android is one of the most popular smartphone operating systems. Android OS was created by Android Inc., which was purchased by Google in 2005. Various Android applications, such as games, music players, and cameras, are developed for these cellphones. There are over 3.3 million apps in the Google Play Store. On a worldwide scale, Android still reigns supreme. Android is used by around 75% of the world’s population, whereas iOS is used by 15%. It is an operating system with a large app market.

Android Developer Roadmap 2022 suggests learning paths to understanding Android development. You can read the roadmap following the line path in the middle of the map.

Why Android? (Decide the Goal First?)

So, before diving into the Android Roadmap in its entirety, one needs to have a clear aim in mind as to why they want to study Android. Is it for your academic projects in college? Is it for your long-term career, or is it just for fun? or do you want to create a business by developing your own apps? So first make a clear goal. Why do you want to learn Android? For example, if you want to learn Android for your college Academic projects then it’s enough to just learn the beginner things in Android. Similarly, if you want to build your long term career then you should learn the professional or advanced things too. So it’s on your hand and it’s your decision why you want to learn Android.

How to Learn Android?

In Android, programming is done in two languages JAVA or Kotlin and XML (Extension Markup Language). The XML file (as a front-end) deals with design, presentation, layouts, blueprints, and so on, whereas the JAVA or KOTLIN file (as a back-end) deals with button functionality, variables, storage, and so on ( as a back-end). And for an Android newbie, the most perplexing issue is deciding between Java and Kotlin. So let me begin by attempting to resolve the ambiguity.

Java or Kotlin?

Java is the official language for developing Android apps, and as a result, it is also the most popular. Many of the apps in the Play Store are written in Java, which is also Google’s most widely supported programming language.

Kotlin is a cross-platform programming language that may be used as an alternative to Java for Android App Development. It has also been introduced as a secondary “official” Java language in 2017. The only sizable difference is that Kotlin removes the superfluous features of Java such as null pointer exceptions. It also removes the necessity of ending every line with a semicolon. In short, Kotlin is much simpler for beginners to try as compared to Java and it can also be used as an “entry point” for Android App Development.

So my recommendation for a beginner is to go with Java first, then jump to Kotlin. Why Kotlin? Because Google has already declared Kotlin as the first-class language. And then Why Java? So in order to get the most out of Kotlin, we must have a knowledge of Java. So start with the Java basics then the Kotlin basics then go for Android Studio.

Android Development Roadmap

Start with the Overview of Android. Read some android related blogs and also research some Android-related things. For example read blogs on Introduction to Android Development, History of Android, Different Versions of Android, and also topics like Why Kotlin will replace Java for Android App Development, etc. etc. and make a complete mind makeup to start your journey on Android. Make yourself self-motivated to learn Android and build some awesome projects on Android. Do it regularly and also start learning one by one new concept on Android. It will be very better to join some workshops or conferences on Android before you start your journey. Make your goal clear and move on toward your goal.

1) Programming

One may consider this step as a prerequisite. Learn these programming languages ​​before you start learning Android.

  • Java is a general-purpose, statically typed, object-oriented programming language designed to be used in conjunction with the Java Virtual Machine (JVM).
  • Android is Google’s mobile operating system, used for programming or developing digital devices (Smartphones, Tablets, Automobiles, TVs, Wear, Glass, IoT).
  • XML is the language used for Developing Android User Interface.Extensible Markup Language (XML) is a flexible, structured document format that defines human- and machine-readable encoding rules.

After Google Io 2019, Kotlin Is the preferred and Official Language for Android Development.

2) Android Studio

It’s better to know your tools before you are going to use it. Android Studio is the official Integrated Development Environment for Google’s Android operating system, built on JetBrains’ IntelliJ IDEA software and designed specifically for Android development.

  • File Structure:
    • AndroidManifest.xml file
    • Java file
    • Drawable file
    • File layout
    • mipmap file
    • colors.xml file
    • strings.xml file
    • styles.xml file
    • build.gradle (Module: app) file
  • Android Studio Overview:
    • Create a new project
    • Reopen, close, save the project
    • Create a new activity, classes, drawable resource files
    • Run the app on AVD of Emulator or in a real device etc.

3) Android Components

There are some necessary building blocks that an Android application consists of. These loosely coupled components are bound by the application manifest file which contains a description of each component and how they interact.

  • Activity:
    • Activity life cycle
    • Handle Activity State Changes
    • Understand Tasks and Back Stack
    • Processes and Application Lifecycle
  • Services:
    • Types of Android Services
    • The Life Cycle of Android Services
  • Content Provider:
    • Content URI
    • Operations in Content Provider
    • Working of the Content Provider
    • Creating a Content Provider
  • Broadcast Receiver:
    • Implicit Broadcast Exceptions

4) Simple UI Design

After you got an idea about the different components of Android then start exploring some simple UI design which is given below.

  • Explore different layouts:
    • Frame
    • Linear
    • Relative
    • Constraint
  • View Elements:
    • TextView
    • EditText
    • Buttons
    • ImageView
  • Intent:
    • Implicit
    • Explicit
    • Intent Filter

5) Complex UI Design

Once you have a command on simple UI design then solely move to the complex UI design part such as:

  • ListView
  • RecycleVIew
  • Fragments
  • Dialogs
  • Toast
  • Bottom Sheets
  • Navigation Drawer
  • Tabs
  • Material Design
  • Some inserting Animations

6) Storage

In Android, there are three types of the storage system:

  • Shared Preferences
  • File System
  • Database

7) .Architecture

A set of libraries that aid in the development of robust, tested, and maintained apps. Begin with classes for controlling the lifespan of your user interface components and data persistence.

The main parts of Architecture are:

  • Code Architecture
  • Dependency Injection
  • Quality Assurance

The Model-View-Controller (MVC) architectural pattern divides an application into three logical components: model, view, and controller. Each of these components is designed to handle specific parts of application development.

The Model – view – presenter (MVP) architectural pattern is a descendant of the model – view – controller (MVC) architectural pattern, which is mostly used to create user interfaces. In MVP, the presenter takes on the role of the “middleman.” In MVP, the presenter is in charge of all presentation logic.

The Mode-View-ViewModel pattern employs Data Binding to ensure that each view contains precisely one variable, vm, which stands for ViewModel. The idea is that the ViewModel should contain all of the information needed to display the View. A single view model can be shared by multiple views. This allows functionality to be reused for a different layout.

Dependency injection is a technique whereby one object supplies the dependencies of another object. A dependency is an object that can be used. An injection is the passing of a dependency to a dependent object that would use it.

Quality assurance is a method of avoiding problems when delivering products or services to clients by preventing faults and defects in manufactured products.

8) Build

  • Gradle
  • Debug / Release Configuration

9) Threading

10) Debugging

One of the most important skills of a developer is debugging skills. So the developer must learn these things:

  • Exceptions
  • Error Handling
  • Logging
  • Memory Profiling

11) Memory Leaks

  • Cause of memory leaks
  • Detecting and fixing memory leaks
  • Context

12) Third-Party Libraries

  • Image Loading Libraries
  • Dependency Injection

13) Android Jetpack

On its official site, it says Android Jetpack is a set of libraries, tools, and architectural guidance to help make it quick and easy to build great Android apps. It provides common infrastructure code so you can focus on what makes your app unique.

  • AppCompat library
  • Architecture components,
  • Animation and transitions
  • Android Ktx
  • Navigation
  • Paging
  • Slices
  • WorkManager

14) Android Architecture

The three famous architecture in the Android world are:

  • MVVM (Model – View – ViewModel)
  • MVI (Model-View-Intent)
  • MVP (Model View Presenter)

15) Firebase

  • FCM (Firebase Cloud Messaging)
  • Analytics
  • Remote Config
  • App Indexing

16) Testing Unit

  • Local Unit Testing
  • Instrumentation Testing

17) Security

  • Encrypt / Decrypt
  • Proguard

18) App Release

19) Keep Practicing and Read Some Android Tips

“Practice makes a man perfect” which tells the importance of continuous practice in any subject to learn anything.

Android Developer Salary

The estimated total pay for an Android Developer is $ 100,522 per year in the United States area, with an average salary of $ 89,484 per year.

Frequently Asked Questions

  • How long does it take to build an android app?

On average, it takes 3 to 4 months to build an android app. Some of the complex apps need more than 6 months.

You can also take this time as the duration of the Android Development Roadmap.

Building an application, however, is dependent on developer teams and team size. Meanwhile, some Android applications may be created in a single day.

  • Can we build applications from python?

Yes, we can build applications from python. Python is a versatile language and it is cross-platform which we can build on iOS and android.

  • Can Python be used for mobile app development?

Python does not have built-in mobile development capabilities. But there are some packages to create mobile applications like Kivy, Beeware’s Toga library.

Thus, with the help of libraries, we can use them to create mobile applications.

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