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| Android Development Roadmap(Kotlin) |
The roadmap is complete A to Z for professional android development roadmap using kotlin in 2025. It includes everything you need to know from total beginner to advanced.
Android History
Android Architecture
RoadMap
Views (Widgets):
- TextView
ImageView
EditText
ImageButton
ProgressBar
Spinner
SeekBar
RatingBar
AutoCompleteTextView
CardView
Button
TextView
Button
Checkbox
Radio Button
Radio Button Group
Image View
Image Button
Toggle Button
Seek Bar
Rating Bar
CardView
Toast
Animations
ViewGroup (Layouts):
Linear Layout
Relative Layout
Constraint Layout
Frame Layout
ListView
WebView
Table Layout
Grid Layout
ScrollView
NestedScrollView
App Components
Services
Broadcast Receiver
Content Provider
Intent & Intent Filter
Serializable
Parcelable
Bundles
Navigation
Navigation Graph
Actions & Global Actions
Destinations
Fragments & Lifecycle
Fragment Back Stack
Adding Fragments (Static/Dynamic)
Fragment Manager & Transactions
Menus
TabLayout
ViewPager/ViewPager2
Advanced Navigation
Bottom Navigation
Navigation Drawer
DialogFragment
Deep Link
SafeArgs
Back Button Handling
Toolbar
Text Fields:
Plaintext
Password
Email
Phone
Telephony Manager:
IMEI
Number
Data
SMS
Wi-Fi Manager:
Controlling WiFi
Discoverable Networks
Connect WiFi
Animation & Loader
- Progress bar
- Shimmer
Image loading:
Bluetooth
Controlling Bluetooth
Discoverable Networks
Connect Bluetooth
Dialogs
Alert
Date Picker
Time Picker
Android Storage
SharedPreferences
SQLite
Room
Architecture Patterns
- MVVM Architecture (Popular)
- Clean Architecture (advanced)
- Flow, StateFlow, SharedFlow
Asynchronous Programming
Threads
Coroutines
WorkManager
AlarmManager, JobScheduler (special cases)
Threads
Coroutines
WorkManager
AlarmManager, JobScheduler (special cases)
Google Maps:
Google Maps View
Map Fragment
Getting Current Location
Distance Between Two Locations
Google Maps View
Map Fragment
Getting Current Location
Distance Between Two Locations
Networking
- REST APIs with Retrofit
GSON / Moshi for JSON parsing
OkHttp Interceptors
- WebSockets
- GraphQL
- REST APIs with Retrofit
GSON / Moshi for JSON parsing
OkHttp Interceptors
- WebSockets
- GraphQL
Firebase & Google Services
Jetpack Compose
Text, Button, Image, Spacer, Icon, TextField
Layouts & Modifiers
LazyColumn & LazyRow
Composable Lifecycle
State Hoisting
Navigation in Compose
Text, Button, Image, Spacer, Icon, TextField
Layouts & Modifiers
LazyColumn & LazyRow
Composable Lifecycle
State Hoisting
Navigation in Compose
Others
Week 1 — Foundations + MVVM + Room
Project 1: “QuickNotes MVVM” (Notes app) — Views → Room → MVVM
Project 1: “QuickNotes MVVM” (Notes app) — Views → Room → MVVM
Day 1
Kotlin refresh: null-safety, data classes, extensions, coroutines (launch/async), Flow vs LiveData.
Create repo + base Android project, enable ViewBinding.
Deliverables: Kotlin playground file with 15 tiny functions; empty app scaffold commit.
Kotlin refresh: null-safety, data classes, extensions, coroutines (launch/async), Flow vs LiveData.
Create repo + base Android project, enable ViewBinding.
Deliverables: Kotlin playground file with 15 tiny functions; empty app scaffold commit.
Day 2
Activities & Fragments lifecycle, intents, menus.
Build UI screens (list, add/edit).
Deliverables: Add/Edit Note screens navigate via Navigation Component.
Activities & Fragments lifecycle, intents, menus.
Build UI screens (list, add/edit).
Deliverables: Add/Edit Note screens navigate via Navigation Component.
Day 3
RecyclerView + ListAdapter + DiffUtil, item click, long-press delete, search with TextWatcher.
Deliverables: Notes list with search & swipe-to-delete (ItemTouchHelper).
RecyclerView + ListAdapter + DiffUtil, item click, long-press delete, search with
TextWatcher.
Deliverables: Notes list with search & swipe-to-delete (ItemTouchHelper).
Day 4
Room: Entity, DAO, Database.
MVVM: ViewModel, Repository, Flow<List<Note>>.
Deliverables: Full CRUD in Room, list updates via Flow.
Room: Entity, DAO, Database.
MVVM: ViewModel, Repository,
Flow<List<Note>>.
Deliverables: Full CRUD in Room, list updates via Flow.
Day 5
Coroutines: viewModelScope, error handling with try/catch, one-shot events (Snackbar).
Replace SharedPreferences with DataStore for app settings (theme, sort).
Deliverables: Theme toggle + sort order persisted in DataStore.
Coroutines:
viewModelScope, error handling withtry/catch, one-shot events (Snackbar).Replace SharedPreferences with DataStore for app settings (theme, sort).
Deliverables: Theme toggle + sort order persisted in DataStore.
Day 6
WorkManager: daily local backup export/import JSON.
Intro Jetpack Compose: convert Add/Edit screen to Compose (or add one Compose-only screen) via ComposeView.
Deliverables: One Compose screen integrated into fragment app.
WorkManager: daily local backup export/import JSON.
Intro Jetpack Compose: convert Add/Edit screen to Compose (or add one Compose-only screen) via
ComposeView.
Deliverables: One Compose screen integrated into fragment app.
Day 7
Polish + Unit tests for DAO & Repository (JUnit). Add LeakCanary.
Write README (screenshots, features, tech).
Job skills covered: Activities/Fragments, RecyclerView, Navigation, Room, MVVM, DataStore, Coroutines, WorkManager, basic tests.
Polish + Unit tests for DAO & Repository (JUnit). Add LeakCanary.
Write README (screenshots, features, tech).
Job skills covered: Activities/Fragments, RecyclerView, Navigation, Room, MVVM, DataStore, Coroutines, WorkManager, basic tests.
Week 2 — Networking + Paging 3 + Hilt + Compose
Project 2: “NewsRush” (Offline-first news) — Retrofit + Room + Paging3 + Hilt + Compose
Project 2: “NewsRush” (Offline-first news) — Retrofit + Room + Paging3 + Hilt + Compose
Day 8
Retrofit + OkHttp (logging), parse a public news API, model mapping.
Deliverables: Fetch headlines & show basic list (XML or Compose).
Retrofit + OkHttp (logging), parse a public news API, model mapping.
Deliverables: Fetch headlines & show basic list (XML or Compose).
Day 9
Repository pattern with Result<T>. Error states, retry, loading UI.
Cache articles in Room.
Deliverables: Online list + offline cache.
Repository pattern with
Result<T>. Error states, retry, loading UI.Cache articles in Room.
Deliverables: Online list + offline cache.
Day 10
Paging 3 with RemoteMediator (network→db).
Deliverables: Infinite scroll headlines, detail screen.
Paging 3 with RemoteMediator (network→db).
Deliverables: Infinite scroll headlines, detail screen.
Day 11
Hilt DI: modules for Retrofit, Room, Repo, ViewModel injection.
Deliverables: App fully on Hilt, no manual factories.
Hilt DI: modules for Retrofit, Room, Repo, ViewModel injection.
Deliverables: App fully on Hilt, no manual factories.
Day 12
Compose UI: Convert list & detail to Compose (LazyColumn, pull-to-refresh, placeholder shimmer).
Deliverables: Compose-first screens, Material 3 theme, dark mode.
Compose UI: Convert list & detail to Compose (
LazyColumn, pull-to-refresh, placeholder shimmer).
Deliverables: Compose-first screens, Material 3 theme, dark mode.
Day 13
Testing: repository unit tests (fake DAO/service), UI test (Espresso for legacy view or Compose testing).
Crashlytics integration.
Deliverables: CI-ready tests, crash reporting working.
Testing: repository unit tests (fake DAO/service), UI test (Espresso for legacy view or Compose testing).
Crashlytics integration.
Deliverables: CI-ready tests, crash reporting working.
Day 14
Performance pass: images via Coil, diffing, strict mode, startup time check.
Release internal test build, ProGuard/R8 basic rules.
Skills covered: Retrofit, Room cache, Paging3 RemoteMediator, Hilt, Compose, testing, performance, release prep.
Performance pass: images via Coil, diffing, strict mode, startup time check.
Release internal test build, ProGuard/R8 basic rules.
Skills covered: Retrofit, Room cache, Paging3 RemoteMediator, Hilt, Compose, testing, performance, release prep.
Week 3 — Realtime + Firebase + Notifications
Project 3: “PingChat” (1-to-1 chat) — Firebase Auth/Firestore/Storage + FCM + Compose
Project 3: “PingChat” (1-to-1 chat) — Firebase Auth/Firestore/Storage + FCM + Compose
Day 15
Setup Firebase project: Auth (Email/Google). User profile model.
Deliverables: Login/Sign-up flows with validation.
Setup Firebase project: Auth (Email/Google). User profile model.
Deliverables: Login/Sign-up flows with validation.
Day 16
Firestore: chats & messages collections, indexes, security rules (read/write).
Deliverables: Send/receive text messages (create chat thread on first message).
Firestore: chats & messages collections, indexes, security rules (read/write).
Deliverables: Send/receive text messages (create chat thread on first message).
Day 17
Realtime updates with snapshot listeners; offline persistence.
Chat list with last message & timestamp.
Deliverables: Live chat list + message screen in Compose.
Realtime updates with snapshot listeners; offline persistence.
Chat list with last message & timestamp.
Deliverables: Live chat list + message screen in Compose.
Day 18
Firebase Storage: image upload with progress + preview; send image message.
Deliverables: Image messages + compression.
Firebase Storage: image upload with progress + preview; send image message.
Deliverables: Image messages + compression.
Day 19
FCM push notifications (new message). Foreground handling, action intents (reply).
Deliverables: Receive push while app closed; tap opens thread.
FCM push notifications (new message). Foreground handling, action intents (reply).
Deliverables: Receive push while app closed; tap opens thread.
Day 20
Analytics events, error reporting, WorkManager retry for failed sends.
Deliverables: Robust send pipeline, analytics dashboard events.
Analytics events, error reporting, WorkManager retry for failed sends.
Deliverables: Robust send pipeline, analytics dashboard events.
Day 21
Clean architecture refactor (domain/data/ui), Hilt modules tidy, UI tests for login/chat.
README + short demo video.
Skills covered: Auth, Firestore, Storage, FCM, realtime listeners, offline-first, Compose chat UI.
Clean architecture refactor (domain/data/ui), Hilt modules tidy, UI tests for login/chat.
README + short demo video.
Skills covered: Auth, Firestore, Storage, FCM, realtime listeners, offline-first, Compose chat UI.
Week 4 — Capstone + Payments + Multi-module polish
Project 4: “ShopSmart” (E-commerce capstone) — Clean Architecture + Compose + Hilt + Paging + Room + Razorpay/Stripe (test)
Project 4: “ShopSmart” (E-commerce capstone) — Clean Architecture + Compose + Hilt + Paging + Room + Razorpay/Stripe (test)
Day 22
Plan features & schema: products (API or local JSON), cart (Room), orders, profile.
Setup multi-module (optional): app, core, feature:catalog, feature:cart.
Deliverables: Project scaffold, navigation graph.
Plan features & schema: products (API or local JSON), cart (Room), orders, profile.
Setup multi-module (optional):
app,core,feature:catalog,feature:cart.
Deliverables: Project scaffold, navigation graph.
Day 23
Catalog list with Paging3 from API (or local source paged).
Product detail screen (images, specs).
Deliverables: Catalog → Detail flow, wishlist in Room.
Catalog list with Paging3 from API (or local source paged).
Product detail screen (images, specs).
Deliverables: Catalog → Detail flow, wishlist in Room.
Day 24
Cart: add/update/remove, totals, price rules, promo code mock.
Deliverables: Cart screen backed by Room + StateFlow.
Cart: add/update/remove, totals, price rules, promo code mock.
Deliverables: Cart screen backed by Room + StateFlow.
Day 25
Checkout: address form validation, order summary.
Integrate Razorpay/Stripe test mode (mock success/failure).
Deliverables: Payment flow (test), order creation & persistence.
Checkout: address form validation, order summary.
Integrate Razorpay/Stripe test mode (mock success/failure).
Deliverables: Payment flow (test), order creation & persistence.
Day 26
Profile & Orders: order history, reorder, settings (DataStore).
Deep links (product link opens detail), Share sheet.
Deliverables: Orders list + deep links + share.
Profile & Orders: order history, reorder, settings (DataStore).
Deep links (product link opens detail), Share sheet.
Deliverables: Orders list + deep links + share.
Day 27
Accessibility (content descriptions, talkback), animation polish (Motion/Compose animations), skeletons.
Performance: StrictMode, leaks, startup, jank tracing.
Deliverables: Smooth 60fps lists, no leaks.
Accessibility (content descriptions, talkback), animation polish (Motion/Compose animations), skeletons.
Performance: StrictMode, leaks, startup, jank tracing.
Deliverables: Smooth 60fps lists, no leaks.
Day 28
Tests: DAO, repository, a few Compose UI tests.
Final Play-ready build, screenshots, store-listing draft, full README.
Skills covered: End-to-end product app, payments, multi-module, clean architecture, Compose mastery.
Tests: DAO, repository, a few Compose UI tests.
Final Play-ready build, screenshots, store-listing draft, full README.
Skills covered: End-to-end product app, payments, multi-module, clean architecture, Compose mastery.
Days 29–30 (Bonus Job Prep)
Portfolio polish: pin 4 repos (QuickNotes, NewsRush, PingChat, ShopSmart). Each has README with features, tech stack, screenshots, APK link, and a 60-sec demo video.
Interview prep (2h/day): lifecycle, threading, coroutines, Flow vs LiveData, DI, Room, Paging, Compose state, WorkManager, Firebase basics, app release.
DSA (1–2h/day): arrays, strings, hashmaps, two-pointers, simple sorting—solve 20–30 easy/mid in Kotlin.
Portfolio polish: pin 4 repos (QuickNotes, NewsRush, PingChat, ShopSmart). Each has README with features, tech stack, screenshots, APK link, and a 60-sec demo video.
Interview prep (2h/day): lifecycle, threading, coroutines, Flow vs LiveData, DI, Room, Paging, Compose state, WorkManager, Firebase basics, app release.
DSA (1–2h/day): arrays, strings, hashmaps, two-pointers, simple sorting—solve 20–30 easy/mid in Kotlin.
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