[爆速開発LT #2] Codex-Powered Mobile Apps Development - Deep Dive Edition -

This is the slide, "Codex-Powered Mobile Apps Development - Deep Dive Edition -" at 爆速開発LT：Codex編 Vol.2.
#Lancers_AI_LT #Codex #aicommunity #techevent

Transcript

1. Kenichi Kambara (@korodroid) November 26, 2025 Codex-Powered Mobile Apps Development - Deep Dive Edition - ര଎։ൃLTɿCodexฤ #2
2. •Mobile App Development •Talks (25 Int’l/100+ Domestic) •Writings (10 Dev/Edu Books) •[Of fi cial] Evangelist at NTT TechnoCross •[Private] iplatform.org About me ਆݪ ݈Ұ (X:@korodroid)
3. Agenda •The Complexity of Mobile Apps Development •“Chat-based AI” vs. “Agent-based AI” •Codex Walkthrough (Mobile Apps Development) •What prompt should we write down?
4. The Complexity of Mobile Apps Development  • Platform Support iOS Android Cross-platform Device diversity Coding Debugging Testing Refactoring Performance Versioning Review guidelines Metadata Release Accessibility Responsive design Localization Usability • Development Process • App Store Requirements • UI/UX
5. Real Pains in Mobile Apps Development  🔁 Repetitive & cross-cutting changes ⚡ Slow iteration loops 🔎 Late discovery of issues 🧪 Thin tests 📱 Device/OS fragmentation
6. Evolving the Developer Work fl ow  $IBUCBTFE
   "* 🧠Gemini 🧠Claude 🧠ChatGPT "HFOUCBTFE
   "* 🛠Cursor 🛠Claude Code 🛠Codex Conversation through Q&A, Snippets, Brainstorming Understands repo context, Edits fi les directly, Runs tests
7. Codex Walkthrough (Mobile Apps Development)
8. Use Case (Add Darkmode Feature)  Before After
9.  Codex Walkthrough (Mobile Apps Development) 1. Launch interactive mode with codex 2. Run /init to create AGENTS.md (project guidelines) 3. Use /approvals to set the approval mode on your preference 4. Prompt Codex: 5.Codex generates the diff → review → approve → automatically applies changes 6.Verify with fl utter run ?
10.  What prompt should we write down? •UIͷ࢓༷ (τάϧͷҐஔ) •ৼΔ෣͍ͷنఆ (୺຤ઃఆͷѻ͍) •ઃఆ಺༰ͷӬଓԽ •ίʔυมߋ࣌ͷςετ #BE
    QSPNQU #FUUFS
    QSPNQU
    JODMVEFT
    μʔΫϞʔυػೳΛ௥Ճ͍ͯͩ͘͠͞ɻ
11.  Good prompt Examples μʔΫϞʔυػೳΛ௥Ճ͍ͯͩ͘͠͞ɻ ཁٻࣄ߲ - AppBar্ʹςʔϚ(ϥΠτ / μʔΫ / γεςϜ) ੾Γସ͑τάϧΛ௥Ճ͍ͯͩ͘͠͞ɻ - Ϣʔβͷબ୒಺༰͸ӬଓԽ͍ͯͩ͘͠͞ɻ - "γεςϜ"͕બ୒͞Εͨ৔߹͸ɺσόΠεઃఆͷςʔϚΛ࠾༻͍ͯͩ͘͠͞ɻ - ฤूޙɺFlutterςετΛ࣮ߦ͍ͯͩ͘͠͞ɻ
12. In-Progress Screenshot 1/2 (Codex)  BQQSPWBMT 6QEBUFE
    1MBO
13.  .PEJ fi FE
    5FTU$BTF In-Progress Screenshot 2/2 (Codex) 5FTU
    3FTVMU
14. 💡Codex: Key Takeaways on Mobile Development •Faster (less repetition) •Smarter (context-aware plans) •Safer (tests + approvals) • 
15. Facebook:http://fb.com/kanbara.kenichi X:@korodroid LinkedIn:http://www.linkedin.com/in/korodroid Thank you so much Feel free to reach out for technical speeches, writing, or other inquiries.