Reference: Platform primitivesTopics: 3 chaptersPrerequisites: Compose + lifecycle fundamentals

Graphics, Media & Performance Primitives

Three topics that don't fit neatly into the numbered modules but every serious Android app needs: custom graphics (Canvas, AGSL shaders), media playback (Media3 / ExoPlayer), and battery / power optimization. Each is a full chapter here.

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Graphics & Rendering

Canvas, AGSL shaders, drawWithCache, animated vector drawables, and custom drawing for performance.

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Media3 / ExoPlayer

The full media stack — playback, DRM, adaptive streaming, MediaSession, lockscreen + Android Auto.

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Battery & Power

Doze, App Standby, background execution limits, Battery Historian, and the optimization playbook.

When you'll reach for these

• Graphics: bespoke data visualization, game UI, custom chart libraries, realtime video effects, branded loading animations that Lottie can't handle.
• Media3: music/video/audio playback, podcasts, livestreams, recorded content, any app with audio that must survive screen off / background.
• Battery: every fitness / tracking / streaming app — once you have real users, the one-star reviews about battery drain come fast unless you've been disciplined from day one.

How these relate to existing modules

• Jetpack Compose — Custom Layouts & Gestures covers Compose Canvas and basic drawing. This section goes deeper into Skia API, AGSL, and native rendering.
• Advanced Components — CameraX & Sensors covers camera pipelines. Media3 extends into video playback.
• Module 10 — Performance covers startup, macrobenchmark, and baseline profiles. This section covers battery specifically.

Chapters

• Graphics & Rendering — Canvas, AGSL, drawWithCache, Skia, AnimatedVectorDrawable
• Media3 / ExoPlayer — playback, DRM, adaptive streaming, MediaSession, Android Auto integration
• Battery & Power Optimization — Doze, App Standby, JobScheduler vs WorkManager, Battery Historian, profiling