Android

roadmap.sh: https://roadmap.sh/android

Suggested path through the Android nodes. Each node links to its lesson when written.

Nodes

Languages & fundamentals

• Basics of Kotlin
• Kotlin
• Java
• Basics of OOP
• Functional programming
• Coroutines
• Flow
• RxJava

Tooling & environment

• Development IDE (Android Studio)
• Gradle build system
• Android SDK & SDK Manager
• Emulator & AVD Manager
• ADB (Android Debug Bridge)
• Version control with Git
• GitHub
• GitLab

App components

• App components overview
• Activity
• Activity lifecycle
• Fragments
• Services
• Broadcast receivers
• Content providers
• Intents & intent filters
• App shortcuts
• App manifest
• Permissions

UI with Views

• XML layouts
• ConstraintLayout
• RecyclerView
• ImageView
• ViewBinding
• DataBinding
• Material Design components

UI with Jetpack Compose

• Composable functions
• Column & Row
• Box
• Button
• Card
• Image
• Icon
• Dialog
• BottomSheet
• State & recomposition
• Theming & Material 3

Architecture

• Design & architecture principles
• MVC
• MVP
• MVVM
• MVI
• Repository pattern
• Observer pattern
• Factory pattern
• Builder pattern
• Clean architecture

Jetpack & lifecycle

• ViewModel
• LiveData
• Lifecycle-aware components
• Navigation component
• WorkManager
• Paging

Data & persistence

• SharedPreferences
• DataStore
• Room database
• File system
• SQLite

Networking & async

• Networking (Retrofit / OkHttp)
• REST APIs
• JSON parsing (Moshi / Gson)
• Asynchronism
• Authentication
• Caching

Dependency injection

• Dependency injection concepts
• Hilt
• Dagger
• Koin

Firebase & services

• Firebase overview
• Firestore
• Cloud Messaging (FCM)
• Crashlytics
• Remote Config
• Google Play Services
• Google Maps
• Google AdMob

Testing & quality

• Debugging
• JUnit
• Espresso
• Linting
• ktlint
• detekt
• LeakCanary

Distribution

• Google Play Store
• App signing
• App Bundles
• CI/CD for Android

Resources

See resources.md.

Project ideas

• Build an offline-first notes app using Jetpack Compose, Room, and a Repository-pattern MVVM architecture.
• Create a weather app that pulls a REST API with Retrofit + Coroutines, caches with DataStore, and shows a Compose UI.
• Ship a small habit-tracker to the Play Store with WorkManager reminders, Firebase Crashlytics, and a signed App Bundle.