ProGuard and R8 optimization in Android Kotlin - Build, Publish & Deploy

Build & Publish - ProGuard and R8 optimization

Performance Impact

Using ProGuard and R8 helps your Android app run faster and use less memory. They remove unused code and shrink your app, which means the app loads quicker and uses less battery. This helps keep your app smooth at 60 frames per second, especially on older devices.

💻

How to Optimize for 60fps Rendering

Enable R8 in your build to automatically shrink and optimize your code. Use minifyEnabled true in your build.gradle. Keep your ProGuard rules simple and only keep what you need. Avoid keeping large libraries if unused. Test your app after shrinking to catch any missing code that might cause crashes.

Impact on App Bundle Size and Startup Time

ProGuard and R8 reduce your app size by removing unused classes and methods. Smaller apps download faster and start quicker. This improves user experience and reduces data usage. A smaller app bundle also means faster installation and less storage used on the device.

iOS vs Android Differences

ProGuard and R8 are Android-specific tools. iOS apps use different tools like Bitcode and Swift compiler optimizations. Android requires code shrinking because apps often include many libraries. iOS apps are usually smaller by default but use different app thinning methods.

Store Review Guidelines and Requirements

Google Play requires apps to be signed and optimized for performance. Using R8 and ProGuard helps meet performance guidelines by reducing app size and improving speed. Make sure your app does not remove code needed for Google Play services or analytics, or it may fail review.

Self Check

Your app takes 5 seconds to load this screen. What's likely wrong?

• You might not have enabled R8 or ProGuard, so your app is too large and slow to start.
• Your ProGuard rules might be too strict, removing needed code causing crashes or delays.
• You could have unused libraries bloating your app size and slowing startup.

Key Result

Using ProGuard and R8 in Android Kotlin projects reduces app size and memory use, improving startup speed and smooth 60fps UI performance. Proper configuration ensures faster downloads and passes Google Play performance guidelines.