Android Game - Basics

Use Kotlin variables, basic types, operators, and string templates to represent game data.

Implement game rules with Kotlin conditionals, when expressions, ranges, and loops.

Define and call Kotlin functions with parameters, return values, and default arguments.

Handle optional values safely with Kotlin nullable types, safe calls, and the Elvis operator.

Model game entities with Kotlin classes and data classes, and transform groups of entities with collections and lambdas.

Differentiate activities, services, broadcast receivers, and content providers by their responsibilities in an Android app.

Trace an activity through its lifecycle callbacks using Logcat.

Declare app components, required features, and permissions in the Android manifest.

Construct a screen with Jetpack Compose layout, text, image, and button elements.

Manage interactive UI state with Compose state and event handlers.

Use Android resources to provide strings, colors, dimensions, images, and themes.

Launch another app destination with an intent and pass simple data to it.

Store screen and game state in a ViewModel so it survives configuration changes.

Run asynchronous work with Kotlin coroutines without blocking Android's main thread.

Persist preferences and a local high score with Jetpack DataStore.

Diagnose a faulty Android app with Logcat, breakpoints, and stack traces.

Draw the player, obstacles, and play area with the Jetpack Compose Canvas coordinate system.

Convert touch input into bounded player movement on the game canvas.

Implement a frame-driven update loop that uses elapsed time for device-independent movement.

Spawn and update a collection of moving obstacles.

Detect collisions between the player and obstacles using bounding geometry.

Calculate score and increase difficulty according to elapsed play time.

Represent start, running, paused, and game-over behavior with an explicit game-state model.

Pause and resume the game correctly when the Android activity lifecycle changes.

Add lifecycle-aware sound effects and haptic feedback to gameplay events.

Restore game settings and the best local score when the app is relaunched.

Configure the game, credentials, tester access, achievements, and a leaderboard in Google Play Console.

Add the current Play Games Services SDK and required Android configuration to the game project.

Check Play Games Services authentication status and provide a recoverable path when the player is not authenticated.

Unlock, reveal, and increment achievements in response to verified game events.

Submit scores to a leaderboard and open the standard leaderboard interface.

Serialize versioned game progress into a format suitable for a Play Games Services saved-game snapshot.

Load and write saved-game snapshots without blocking gameplay.

Resolve competing local and cloud snapshots with a deterministic conflict policy.

Preserve local progress and present recoverable states when authentication, network, or Play Games API calls fail.

Build a signed Android App Bundle and validate authentication, achievements, leaderboards, and saved games with a Play Console test release.