Mobile Development Guide

Master native and cross-platform mobile development for iOS and Android platforms.

Quick Start

iOS with Swift

import SwiftUI

struct ContentView: View {
    @State private var todos: [String] = []
    @State private var newTodo = ""

    var body: some View {
        VStack {
            TextField("Add todo", text: $newTodo)
            Button("Add") {
                todos.append(newTodo)
                newTodo = ""
            }

            List {
                ForEach(todos, id: \.self) { todo in
                    Text(todo)
                }
            }
        }
    }
}

Android with Kotlin

import androidx.compose.material3.Button
import androidx.compose.material3.TextField
import androidx.compose.runtime.mutableStateOf

@Composable
fun TodoApp() {
    var todos by remember { mutableStateOf(listOf<String>()) }
    var newTodo by remember { mutableStateOf("") }

    Column {
        TextField(
            value = newTodo,
            onValueChange = { newTodo = it },
            label = { Text("Add todo") }
        )
        Button(onClick = {
            todos = todos + newTodo
            newTodo = ""
        }) {
            Text("Add")
        }

        LazyColumn {
            items(todos) { todo ->
                Text(todo)
            }
        }
    }
}

React Native

import React, { useState } from 'react';
import { View, TextInput, TouchableOpacity, FlatList, Text } from 'react-native';

export default function TodoApp() {
  const [todos, setTodos] = useState([]);
  const [input, setInput] = useState('');

  const addTodo = () => {
    setTodos([...todos, input]);
    setInput('');
  };

  return (
    <View>
      <TextInput
        placeholder="Add todo"
        value={input}
        onChangeText={setInput}
      />
      <TouchableOpacity onPress={addTodo}>
        <Text>Add</Text>
      </TouchableOpacity>

      <FlatList
        data={todos}
        renderItem={({ item }) => <Text>{item}</Text>}
      />
    </View>
  );
}

Flutter

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class TodoApp extends StatefulWidget {
  const TodoApp({Key? key}) : super(key: key);

  @override
  State<TodoApp> createState() => _TodoAppState();
}

class _TodoAppState extends State<TodoApp> {
  List<String> todos = [];
  TextEditingController controller = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        children: [
          TextField(controller: controller),
          ElevatedButton(
            onPressed: () {
              setState(() => todos.add(controller.text));
              controller.clear();
            },
            child: const Text('Add'),
          ),
          Expanded(
            child: ListView.builder(
              itemCount: todos.length,
              itemBuilder: (context, index) => Text(todos[index]),
            ),
          ),
        ],
      ),
    );
  }
}

iOS Development Path

Swift Basics

• Variables & Types: var, let, type safety
• Functions: Parameters, return types, closures
• Structs & Classes: Value vs reference types
• Error Handling: try/catch, Result type
• Concurrency: async/await, actors

UI Frameworks

• SwiftUI: Modern declarative UI (recommended)

  • Views, state management, modifiers
  • Navigation, animation, gestures
  • Data binding with @State, @ObservedObject

• UIKit: Older imperative framework

  • View controllers, navigation stack
  • Delegates and data sources
  • Auto Layout constraints

iOS Architecture

• MVC: Model-View-Controller
• MVVM: Model-View-ViewModel with observable
• CLEAN: Entity, Use Case, Interface
• Coordinator Pattern: Navigation management

Key Frameworks

• Foundation: Core utilities and data types
• CoreData: Local persistence
• Networking: URLSession for API calls
• CoreLocation: Location services
• AVFoundation: Camera and media

Android Development Path

Kotlin Basics

• Variables & Functions: val, var, fun
• Classes & Objects: Data classes, sealed classes
• Extension Functions: Adding methods to types
• Coroutines: async/await equivalent
• Flow: Reactive streams

UI Frameworks

• Jetpack Compose: Modern declarative UI (recommended)

  • Composables, state hoisting
  • Layouts and modifiers
  • Navigation, animation

• XML Layouts: Traditional approach

  • Activity, Fragment architecture
  • View binding, data binding

Android Architecture

• MVC: Model-View-Controller
• MVVM: ViewModel, LiveData, Data Binding
• CLEAN: Separation of concerns
• Repository Pattern: Data abstraction

Key Libraries

• Jetpack Components: Room, Lifecycle, ViewModel
• Retrofit: HTTP client
• Hilt: Dependency injection
• Firebase: Analytics, push notifications

Cross-Platform: React Native

Setup & Development

• Expo: Managed development environment
• React Native CLI: Full control
• Navigation: React Navigation
• State Management: Redux, Context API

Advantages & Tradeoffs

• Pros: Code sharing, JavaScript ecosystem
• Cons: Performance, native feel, tooling maturity

Best Practices

• Platform-specific code separation
• Native module development
• Performance optimization
• Bridge communication with native

Cross-Platform: Flutter

Setup & Development

• Dart Language: Flutter's language
• Widget Tree: UI composition
• State Management: Provider, Riverpod, Bloc
• Navigation: Named routes, deep linking

Advantages

• Performance: Compiled to native
• Hot Reload: Fast development
• Beautiful UI: Rich widget library
• Single Codebase: iOS and Android

Ecosystem

• Pub.dev: Package registry
• Popular Packages: http, provider, get
• Plugins: Native functionality access
• Firebase Integration: Easy setup

Mobile Development Essentials

Networking

• REST APIs: JSON parsing, error handling
• GraphQL: Mobile query language
• Offline Sync: Local storage, sync strategies
• SSL Pinning: Security

Local Data

• SQLite: Structured data
• Key-Value Storage: SharedPreferences, UserDefaults
• File System: Documents, cache directories

Authentication

• OAuth 2.0: Third-party login
• JWT: Token-based auth
• Biometric: Face ID, fingerprint
• Session Management: Token refresh

Testing

• Unit Tests: Business logic
• Widget/Component Tests: UI testing
• Integration Tests: Full app flows
• UI Automation: End-to-end testing

Deployment

iOS

1. Apple Developer Account registration
2. Create certificates and identifiers
3. Build and archive app
4. Submit to App Store
5. Review and approval (1-3 days)

Android

1. Google Play Account registration
2. Create signing certificate
3. Build release APK/AAB
4. Upload to Google Play
5. Testing and release (instant)

Publishing Best Practices

• App Store Optimization (ASO)
• Beta testing programs
• Update strategy
• Versioning and release notes

Projects

1. Todo App - Basic CRUD, storage
2. Weather App - API integration, UI
3. Chat Application - Real-time, networking
4. E-commerce App - Complex UI, payments
5. Fitness Tracker - Sensors, data analysis

Resources

Learning Platforms

• Udemy: Framework-specific courses
• Pluralsight: In-depth iOS/Android paths
• Google Codelabs: Official Android tutorials
• Apple Developer: Official iOS resources

Documentation

• Swift.org
• Android Developers
• React Native
• Flutter

Communities

• Stack Overflow: Question and answers
• Reddit: r/iOSProgramming, r/android, r/flutterdev
• GitHub: Open source projects
• Local Meetups: Developer communities

Roadmap.sh Reference: https://roadmap.sh/mobile

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Status: ✅ Production Ready | SASMP: v1.3.0 | Bonded Agent: 05-mobile-specialist