Alex Chen

CameraX simplifies camera implementation with consistent behavior across devices. I bind use cases—Preview, ImageCapture, ImageAnalysis, VideoCapture—to lifecycle. ProcessCameraProvider manages camera instances. Preview displays viewfinder, ImageCaptu

ExoPlayer is a flexible media player supporting diverse formats and protocols. I create instances with ExoPlayer.Builder(context).build() and configure with MediaItem. Setting player.setMediaItem() and player.prepare() initializes playback. PlayerView

DataStore replaces SharedPreferences with coroutine and Flow support. Preferences DataStore stores key-value pairs with type safety using preferencesDataStore delegate. Proto DataStore stores typed objects using Protocol Buffers. I use dataStore.data

Glide efficiently loads and caches images from network, disk, or resources. I use Glide.with(context).load(url).into(imageView) for basic loading. Transformations apply effects—centerCrop(), circleCrop(), RoundedCorners(). Placeholders show during loa

Firebase Cloud Messaging (FCM) delivers push notifications across platforms. I extend FirebaseMessagingService and override onMessageReceived() to handle incoming messages. Device tokens obtained via FirebaseMessaging.getInstance().token register with

Unit testing verifies individual components in isolation. I use JUnit 5 or JUnit 4 as the test framework with @Test annotations. MockK provides Kotlin-friendly mocking—mockk<T>() creates mocks, every { } stubs behavior, verify { } confirms calls

EncryptedSharedPreferences secures simple key-value data using Android Keystore. I create instances with EncryptedSharedPreferences.create() specifying encryption schemes. The master key uses MasterKeys or MasterKey.Builder for automatic key generatio

Paging 3 loads large datasets incrementally with network and database support. I create a PagingSource implementing load() method to fetch pages. RemoteMediator orchestrates network and database, fetching from API and caching locally. Pager configurat

Material Design 3 (Material You) brings dynamic theming to Android. I define color schemes with primary, secondary, tertiary colors and their variants. MaterialTheme composable wraps the app with colorScheme, typography, and shapes. Dynamic colors use

WorkManager schedules deferrable, guaranteed background work. I create Worker or CoroutineWorker subclasses with doWork() method. Constraints specify when work runs—network type, charging status, battery level. One-time requests use OneTimeWorkRequest

RecyclerView displays large datasets efficiently with view recycling. I create a ViewHolder to cache view references and an Adapter to bind data. DiffUtil calculates minimal updates using areItemsTheSame and areContentsTheSame callbacks, improving per

Navigation Component provides consistent navigation with type-safe argument passing. I define navigation graph in XML with destinations and actions. NavController handles navigation with navigate() and popBackStack(). Safe Args plugin generates type-s