Becoming a Zero to Hero Android & iOS Developer requires mastering multiple topics, from the fundamentals to advanced concepts. Below is a comprehensive roadmap covering both Android (Kotlin/Java) and iOS (Swift) development.

1. Introduction to Mobile Development

Overview of Mobile App Development

Differences between Android & iOS Development

Native vs. Hybrid vs. Cross-Platform Development

Tools & Software Required (Android Studio, Xcode)

2. Programming Basics (If New to Coding)

Understanding Programming Languages

Java/Kotlin for Android

Swift for iOS

Variables, Data Types, Operators

Control Flow (Loops, Conditionals)

Functions & Methods

Object-Oriented Programming (OOP) Concepts

3. Android Development (Kotlin/Java)

3.1 Setting Up Android Development Environment

Installing Android Studio

Creating First Android Project

Understanding Android Project Structure

Running Apps on Emulator & Real Device

3.2 UI/UX Design in Android

XML Layouts & View Hierarchy

UI Components (TextView, Button, ImageView, etc.)

ConstraintLayout, LinearLayout, RelativeLayout

RecyclerView & ListView

Material Design Principles

3.3 Activities & Fragments

Activity Lifecycle

Intent & Navigation

Fragment Lifecycle

Communication between Fragments

3.4 Working with Data

Shared Preferences (Local Storage)

SQLite Database & Room Database

Firebase Firestore & Realtime Database

API Calls with Retrofit

3.5 Advanced Android Concepts

Background Tasks (WorkManager, Services, BroadcastReceiver)

Dependency Injection (Dagger, Hilt)

MVVM Architecture & ViewModel

Jetpack Compose (Modern UI Toolkit)

Animations & Transitions

3.6 Publishing & Deployment

Debugging & Performance Optimization

Generating Signed APK

Publishing on Google Play Store

4. iOS Development (Swift & SwiftUI)

4.1 Setting Up iOS Development Environment

Installing Xcode & Setting Up Simulator

Creating First iOS Project

Understanding Xcode Project Structure

4.2 UI/UX Design in iOS

Storyboards & Auto Layout

UI Components (UILabel, UIButton, UIImageView, etc.)

TableView & CollectionView

SwiftUI for Modern UI Development

4.3 ViewControllers & Navigation

ViewController Lifecycle

Segues & Navigation Controller

Passing Data between ViewControllers

4.4 Data Management in iOS

UserDefaults & CoreData (Local Storage)

Using Firebase in iOS

API Calls with URLSession & Alamofire

4.5 Advanced iOS Concepts

Background Tasks & Multithreading (GCD, NSOperation)

Dependency Injection

MVVM Architecture in iOS

Animations & Transitions

SwiftUI vs UIKit

4.6 Publishing & Deployment

Debugging & Performance Optimization

Generating IPA File

Publishing on Apple App Store

5. Cross-Platform Development (Optional, but Useful)

Flutter (Dart)

React Native (JavaScript)

Kotlin Multiplatform Mobile (KMM)

6. Bonus Topics (To Become an Expert)

Unit Testing & UI Testing

Security Best Practices (Encryption, Authentication)

App Performance Optimization

AI & ML in Mobile Apps

AR/VR Development for Android & iOS