learn this topic (theory + diagrams) →
android-developer-roadmap
The complete, stage-by-stage map to becoming an Android engineer — from Hello World to shipping on the Play Store.
AndroidKotlinRoadmapDocs
High-level design
A dependency-ordered roadmap rather than a flat topic list — every stage assumes the ones before it, so you're never asked to understand a ViewModel before the Activity lifecycle.
Foundation
Java, Kotlin, Android Studio, project structure
↓
Core concepts
components, Intents, lifecycles
↓
UI
Views, ViewGroups, RecyclerView, Fragments
↓
Persistence
SharedPrefs, DataStore, Room, files
↓
Threading
threads, Coroutines, Flow, WorkManager
↓
Networking
Retrofit, OkHttp, JSON, OAuth2
↓
Architecture
MVVM/MVI, DI, Clean Architecture
↓
Testing & release
unit/instrumentation, debugging, signing, Play Store
The nine stages
Each stage assumes the ones before it. The stages that map to a runnable repo in this collection link straight to it.
- 1FoundationJava → Kotlin cheat sheet →
Java, Kotlin, Android Studio — the language and the tool.
- 2Core conceptsHow an app launches →
Components, Intents, and the Activity lifecycle.
- 3User interface
Views, ViewGroups, RecyclerView, Fragments.
- 4Persistence
SharedPreferences, DataStore, Room, files.
- 5Threading & concurrencyLearn Coroutines →Learn Flow →
Threads, then Coroutines, then Flow, then WorkManager.
- 6Networking
OkHttp, Retrofit, JSON, OAuth, status codes.
- 7ArchitectureMVVM sample app →
MVVM / MVI, dependency injection, Clean Architecture.
- 8Testing & quality
Unit and instrumentation tests, debugging, memory.
- 9Advanced & release
Compose, Firebase, security, signing, the Play Store.
Low-level design
The roadmap's value is the arrows, not the boxes — the order is the content.
- –Nine stages in strict dependency order, each rendered as a collapsible topic table
- –A timeline diagram maps the stages onto a week-by-week progression
- –The repos in this collection map one-to-one onto stages 1–7, so 'learn it' always means 'build and run it'