Flashable ZIP to replace Android emoji set with EmojiOne. This also includes an OTA survival addon.d script.
EmojiOne v2 is an emoji set more comprehensible than Android's one before Marshmallow.
Version 2 of EmojiOne is the last open and free version of EmojiOne. EmojiOne v3 and later are not open to the public anymore.
The flashable ZIP saves a copy of the previous installed emoji on your device at /system/fonts/NotoColorEmoji.ttf.old.
Run:
make build
This will generate a emojione.zip in the build/ folder.
To make a public release, run:
make release
This will generate a emojione_YYYY-MM-DD.zip file in the releases/ folder.
You'll need a custom recovery installed on your device, such as TWRP.
Restart your device into recovery and start ADB sideload. Then run:
adb sideload <flashable-zip-name>
Alternatively, copy the resulting ZIP to your device storage, restart your device into recovery and use the GUI Install or Install ZIP option.