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Mobile applications

Overview​

Mobile apps run on phones and tablets, either as native (Swift/Kotlin), cross-platform (Flutter, React Native), or hybrid/web (WebView). Distribution usually goes through Apple App Store and Google Play, with platform-specific guidelines, signing, and review processes.

Key concepts​

  • Native vs cross-platform — Performance, access to OS APIs, and team skills trade off.
  • Offline & sync — Local storage, background tasks, and conflict resolution.
  • Push notifications — Device tokens, provider APIs (APNs, FCM).
  • App lifecycle — Foreground, background, low-memory kills, deep links.
  • Store policies — Privacy labels, permissions, and content rules.

Release pipeline (conceptual)​

Sample: React Native functional screen (sketch)​

import { View, Text, Pressable } from 'react-native';

export function HomeScreen() {
  return (
    <View style={{ padding: 16 }}>
      <Text accessibilityRole="header">Hello</Text>
      <Pressable accessibilityRole="button" onPress={() => {}}>
        <Text>Continue</Text>
      </Pressable>
    </View>
  );
}

References​