Android U+2764 (❤) Emoji

on YouTube ↗23m

" summary

Covers where emoji originate (the original 176 pictographs from 1999), why Java chars overflow at 65,536 so use codePointAt and codePointCount, and how Twitter builds its own 872-image set to avoid missing glyphs. Shows reverse engineering of Android’s EmojiCompat behavior: dumping fonts with TTX, adding CBDT/CBLC metadata and running create_font.py to inject the table so Twitter’s font renders on older Android releases — and confirms the approach works across versions.

AI-written summary · about

" chapters (6)

1. 0:00Introduction to emoji
2. 1:12History of emoji
3. 5:59Unicode and emoji
4. 10:59Emoji on Android
5. 13:39Hacking Twitter emoji
6. 20:46Q&A and stickers

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