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A Comprehensive Guide to APKs

By Gaurav Parvadiya | Last Updated On March 18th, 2024

APK files are likely a familiar concept for any reasonably informed Android user—they’re the files that autonomously install mobile apps on Android devices. The apps you see on your Android device originate from APK files, a fundamental understanding of their purpose.

However, grasping APK files extends beyond this basic comprehension, especially for those immersed in the dynamic mobile app market. With the rise of DIY app creation tools, many individuals are steering away from the intricacies of code-heavy app development.

The rationale is clear: APKs represent the ultimate destination for every Android app. In this discussion, we’ll delve into the nuanced details surrounding APKs, shedding light on their significance in the broader landscape of mobile app development.

What is APK?

To put it simply, APKs can be thought of as the packaged form of an app that is exclusively compatible with the Android operating system.

This serves as a fundamental understanding of APK files. To be more precise, APKs represent a file format designed for the installation and distribution of mobile apps. If you explore Android repositories beyond the Google Play Store, such as APKPure and APKMirror, you’ll find yourself downloading the APK version of your desired app for subsequent installation.

The terms ‘Android application packages’ and ‘Android package kit’ both serve as accepted full forms for APKs.

It’s noteworthy that the Google Play Store used to install apps on Android devices until 2018, at which point it transitioned to AABs (Android App Bundles). However, even with this shift, the process of APK generation has merely been deferred to the Play Store. Consequently, APKs remain highly relevant in the current app ecosystem.

Benefits of APKs

APKs bring forth several advantages, prompting Google to implement significant changes in the app development process. Here’s a breakdown of the key reasons behind these alterations:

Application Binary Sizes:

Google’s focus on optimizing application binary sizes plays a pivotal role in enhancing the efficiency of the app development process.

Resource Consumption Optimization:

The changes also target the overall reduction of resource consumption, encompassing CPU, battery, and network resources that unused app features may drain.

Dynamic Module and Feature Exposure:

The new approach allows for the gradual exposure and activation, or deactivation, of specific modules and features. This flexibility caters to diverse customer needs, varying requirements across countries, and other considerations.

This revamped methodology benefits not only users who experience a lighter application download onto their devices but also Research and Development (R&D) and engineering teams. These teams can now build and unveil new features dynamically, adapting to the context and specific requirements of the end users. Supported by new APIs, developers can seamlessly push immediate and flexible application updates to their user base.

What’s inside an APK File

What makes up the contents of an APK file? We understand that APKs are a packaged and compressed representation of mobile apps, comprising various code snippets that collectively shape the app on an Android device.

So, what’s inside an APK file? Let’s delve into the key components:

  1. META-INF Directory: This directory holds crucial meta information, including the manifest file and app certificate.
    • MANIFEST.MF: Much like a cargo manifest details shipment components, this file outlines the contents of the APK file.
    • App Certificate: A vital identifier for the app on the Google Play Store, created only once and crucial for all future app iterations.
    • CERT.SF: Lists resources within the APK file and pinpoints their locations in the manifest file.
  1. LIB Directory: This separate directory contains platform-specific resources for processors like ARMv7, ARMv8 arm64, x86, and x86 64.
  2. Resources.arsc: Compiled resources for immediate availability during app runtime, including precompiled resources like binary XML files.
  3. Res: Houses non-compiled resources outside of resources.arsc.
  4. Assets: The code in this file empowers the app to execute specific key tasks by providing essential resources.
  5. Classes.dex: The DEX file where all code and assets are converted into bits and executed by Android Runtime.
  6. AndroidManifest.xml: This manifest file holds vital app information such as name, version number, and permissions, convertible to binary XML for content inspection.

These components collectively define the typical contents of an APK file, each playing a specific role during installation and the overall functioning of an Android app.

How to Open or Install APKs

Unlocking the contents of an Android Package Kit (APK) file is a straightforward process applicable to Android platforms, as well as Windows and Mac operating systems.

  • On Android devices, apps sourced from the Google Play Store seamlessly install and open without any additional user intervention. However, when dealing with manually downloaded APK files, users may need to permit downloads from unknown sources in the Android OS settings. Prior to such downloads, users must ensure the trustworthiness of the file source, as APK files could potentially harbor malware. Opening a manually installed Android app involves downloading it like any other file and initiating the open request.
  • For Windows 11 users, the Windows Subsystem for Android facilitates the manual installation of APK files, allowing the download of Android applications accessible on the Amazon App Store. Alternatively, an Android emulator like BlueStacks can serve the same purpose on both Windows and macOS.
  • It’s worth noting that APK files are incompatible with iOS devices, given that iOS utilizes IPA file extensions, reinforcing Apple’s enclosed ecosystem approach for iOS.

Role of APKs with App Builders – Understanding its Importance

Choosing an online app builder to create mobile applications is no longer an unconventional decision; it’s a practical choice. Not everyone can delve into the intricacies of app development, making DIY app builders an attractive option to streamline the process.

However, it’s essential to recognize that no-code app builders can sometimes shield users from the technical aspects of mobile apps, and APKs fall into this category.

For example, if someone is using a DIY builder to develop an Android app for a WooCommerce website, their focus on APKs might be limited to the submission process on the Play Store. In such cases, one might question the necessity of delving into the specifics of an APK file.

Yet, when users launch an app, they essentially become participants in the mobile app market. Whether they opt for app builders or traditional coding, understanding the market is paramount.

With the recent introduction of Android App Bundles (AABs) by Google to streamline file size on the Play Store, there’s a shift in APK creation dynamics. AABs delegate APK generation to the Play Store, expediting app installations.

Those who overlook these technical details risk missing out on the advantages of AABs, leading to prolonged installation times, increased app churn, and associated issues. Therefore, gaining knowledge about APK files aligns with the broader understanding of the essentials in the mobile app market.


APKs are crucial to app development. The above discussion covered how APKs, packaged Android apps, are vital to installation and distribution. The transformation of app development highlights their importance.

App builders are becoming more popular; thus, safe practices must be promoted. App builders streamline development, but consumers must understand technicalities like APKs to make informed judgments. Responsible app building improves user experience and app ecosystem security.

This journey shows the evolution of mobile app development through APKs and app builders. Both developers and users contribute to a thriving and sustainable app environment by understanding and promoting safe use.

Gaurav Parvadiya

Gaurav is the founder and CEO of Twinr, a tech entrepreneur with a decade of experience and a passion for SaaS. With a Master's degree in Computer Science, he specializes in no-code development, driving innovation in the mobile app industry. When he's not busy growing the company, you'll find him writing about tech, growth, software development, e-commerce, and occasionally sneaking in a game of badminton.

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