Thread by @NandanLohitaksh

Roadmap for learning Android Development by @championswimmer

Thread Summary 🧵👇

1. Expectations from an Android Developer
i. Android Engineer: Knows basics of programming, can work in android team.
ii. Senior Android Engineer: Knows UI-based development, can be responsible for a small app.
iii. Android Lead: Design + Architecture of complex apps.

2. OOPs Concepts
i. Interfaces, Abstract Classes
ii. Collection Framework - ArrayList, HashMap, Iterator
iii. Visibility (public/private/package) and Inheritance
iv. Exceptions, try-catch syntax

3. Basics of Android
i. Activities and Layouts
ii. Project structure (res, src, manifest etc)
iii. Layouts and UI, XML

4. Event-driven programs (Conceptual)
1. event-driven vs procedural programs
2. concept of ‘view state’
3. UI event listnets
4. etc

5. Important Android Concepts
i. Activity Lifestyle
ii. Components: Activity, Service, Recievers, Providers
iii. Intents
iv. Ids, relations, dp/sp measurements in XML
v. onClickListener, findViewById & view-binding
vi. ListView, RecyclerView, dynamic data

vii. Projects: Calculator, TicTacToe

6. Architecture and State Management (Conceptual)
i. MVC, MVP, MVVM, concept of *MV pattern
ii. Synchronising state and data b/w model and view
iii. Separation of concerns
iv. Stateless and stateful components

v. Persistence of state
vi. Propagation of events

7. Android Architecture Components
i. Fragments and fragment lifecycle
ii. ViewModel, LiveData, and Repository Pattern for MVVM Apps
iii. Saving and restoring state across app and activity restarts

iv. Saving data in local DB using SQLite and Room (ORM)
v. Projects: Task List Manager, Notes App

8. Libraries for Internet Driven Apps
i. OkHttp & Retrofit for: Network calls and REST API libraries
ii. Glide for: Image rendering

iii. Moshi/GSON/Jackson: Serialization frameworks for JSON data
iv. Main Thread vs Background Threads and Basic Coroutines
v. Projects: Github Trending Repo Tracker, Instagram Clone with Imgur API

9. Advanced Language/Platform Concepts
i. Multi-threading, Thread-pool executors
ii. Race conditions, Synchronized, Volatile
iii. OOP Design Patterns: Builder, Factory, Singleton
iv. HLD Patterns
a. Clean Architecture
b. Domain Driven Developments

c. Modularization
d. Dependency Injection (Dagger/Koin/Hilt)
v. RxJava and Reactive Programming

10. Advanced Android Concepts
i. Runtime-permission management
ii. Background tasks, WorkManager, AlarmManager

iii. Android OS providers - Contacts, SMS, Storage access APIs
iv. Audio/Video local and streaming with ExoPlayer
v. GPS, LocationManager, Google Maps API
vi. Android Sensor framework, gesture detection
vii. Firebase Analytics, Push Notification, ML Kit

11. Testing & Automation
i. Unit Testing and Instrumentation Testing Projects
ii. Robo Scripts, Espresso Tests
iii. Mockito, Mokka mocking frameworks
iv. CI/CD integrations, build and deploy pipelines

12. Managing Large Android Projects
i. Projects with 100+ gradle modules
ii. Custom gradle build scripts
iii. Gradle alternatives (Buck, Bazel)
iv. Custom View Components (writing views in Kotlin instead of XML)

v. Custom patterns for RecyclerViews, BaseActivity, BaseFragment with common reusable components
vi. Detecting memory leaks with LeakCanary
vii. Performance Optimisation through Android Profiler

13. Being Up-to-date
i. Watch Google I/O
ii. Jetpack Compose

iii. Dynamic Delivery and Feature Modules
iv. Animations with MotionLayout

You can watch the full video from @scaler_official and @championswimmer here: