Alex Chen

Android performance optimization ensures smooth 60fps UI and efficient resource usage. I use Android Profiler to monitor CPU, memory, network, and energy. Layout Inspector identifies overdraw and deep view hierarchies. Systrace captures system-level t

ProGuard and R8 shrink, obfuscate, and optimize Android apps for release builds. R8 is the default tool, combining shrinking and desugaring. I configure rules in proguard-rules.pro—keeping classes used by reflection, serialization, or native code. -ke

Deep links open specific app content from external sources. I configure intent filters in AndroidManifest with URL schemes—http, https, or custom. App Links verify ownership via assetlinks.json on your domain, providing seamless no-dialog opening. Int

Google Play Billing enables selling digital content and subscriptions. I integrate the Play Billing Library and initialize BillingClient with PurchasesUpdatedListener. Query available products with queryProductDetailsAsync(). Launch purchase flow with

Services run background operations without UI. I extend Service and override onStartCommand() for started services or onBind() for bound services. Foreground services use startForeground() with ongoing notification, required for long-running tasks vis

Notification channels give users granular control over notification types on Android 8+. I create channels with unique IDs, names, and importance levels. Channels group related notifications—messages, reminders, promotions. Users control vibration, so