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Android Kotlinmobile~5 mins

APK vs App Bundle in Android Kotlin

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Introduction

APK and App Bundle are two ways to package your Android app for users. They help deliver your app to phones in the best way.

When you want to publish your Android app to the Google Play Store.
When you want to reduce the app size users download.
When you want to support many device types with one app package.
When you want to test your app on a device before publishing.
When you want to control how your app is delivered and installed.
Syntax
Android Kotlin
APK: Android Package Kit file (.apk) - a single file containing all app code and resources.
App Bundle: Android App Bundle file (.aab) - a publishing format that Google Play uses to generate optimized APKs for each device.
APK is the actual file installed on devices.
App Bundle is used to upload your app to Google Play, which then creates APKs for users.
Examples
An APK file ready to be installed on any compatible Android device.
Android Kotlin
app-release.apk
An App Bundle file uploaded to Google Play for optimized app delivery.
Android Kotlin
app-release.aab
Sample App

This example shows the commands to build an APK and an App Bundle in Android using Gradle. The App Bundle is uploaded to Google Play, which then creates smaller APKs for each user device.

Android Kotlin
/* This is a conceptual example, not runnable code */

// Step 1: Build APK
// ./gradlew assembleRelease

// Step 2: Build App Bundle
// ./gradlew bundleRelease

// Step 3: Upload app-release.aab to Google Play Console

// Google Play generates device-specific APKs from the App Bundle

// Users download smaller APKs optimized for their device
OutputSuccess
Important Notes

APK files are simple and can be installed directly on devices or shared.

App Bundles help reduce app size for users by only sending what their device needs.

Google Play requires App Bundles for new apps since August 2021.

Summary

APK is the full app file installed on devices.

App Bundle is a publishing format that creates optimized APKs for each device.

Use App Bundles to save space and improve user experience when publishing on Google Play.