Android app size reduction techniques
1 ) Importance of Reducing App Size
Reducing mobile app size is crucial for enhancing user experience by enabling faster downloads, saving storage space, and improving app performance. Smaller apps encourage more installations and reduce uninstalls related to device storage limitations.
2 ) Remove Unused Resources
Use tools like FengNiao (iOS) and lint (Android) to detect and eliminate unnecessary resources.
Leverage Android App Bundles to optimize resources tailored for different devices, ensuring only relevant assets are included.
3 ) Optimize Images and Media
Adopt efficient image formats such as WebP and HEIC.
Compress images using tools like Imagify, TinyPNG, or ImageOptim, with options for lossless or lossy compression.
Resize images appropriately for each device and platform to avoid unnecessary large assets.
Use efficient video formats like H.264 and H.265 and compress videos effectively.
4 ) Shrink and Obfuscate Code
Utilize ProGuard (Android) and Link Time Optimization (iOS) to remove unused code segments.
Further optimize code by renaming classes, removing debug information, and compressing code to reduce overall size.
5 ) Leverage App Thinning and App Bundles
Implement App Thinning on iOS to deliver device specific optimized assets.
Use Android App Bundles to generate optimized APKs tailored to the user's device configuration.
6 ) Implement On Demand Resources and Dynamic Delivery
For iOS, use On Demand Resources to download assets only when needed by the user.
On Android, employ Dynamic Delivery to modularize apps into downloadable components, reducing initial install size.
7 ) Optimize Third Party Libraries
Assess the necessity of each library and prefer lightweight alternatives where possible.
Use tree shaking techniques to remove unused code from libraries.
Continuously monitor library performance and size impact with tools such as ProGuard, Firebase, and LeakCanary.
8 ) Bitcode and Runtime Optimizations (iOS)
Enable Bitcode to allow Apple to recompile the app per device specifics, optimizing size and performance.
Utilize whole module optimization and swiftc compiler options for efficient code generation.
9 ) Modularize and Lazy Load Features
Break the app into smaller modules or frameworks.
Load modules or features lazily—only when required—to minimize initial app download and storage.
10 ) Optimize Updates and Network Transfers
Use delta updates to transmit only changes made since the last version rather than the full app package.
Compress content and optimize network requests for updates and resource downloads.
11 ) Continuous Monitoring and Optimization
Regularly analyze app size using automated testing and CI pipelines.
Employ analytics tools and conduct code reviews to maintain a lean and efficient codebase over time.
12 ) Additional Android Specific APK Size Tips
Apply ABI filters in the build configuration to exclude unsupported CPU architectures, reducing native code size.
Configure the app manifest to avoid extracting native libraries unnecessarily, lowering APK size on devices.
By consistently applying these techniques, developers can significantly reduce APK and app bundle sizes, resulting in better app performance, quicker downloads, and a superior end user experience.
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