Here’s my build of LineageOS 20 for Raspberry Pi 4 Model B, Pi 400, and Compute Module 4. It is unofficial and unsupported by the LineageOS team. It’s for advanced users only. Pi 4 model with at least 2GB of RAM is required to run this build.

Important! This image includes parts that are licensed under non-commercial license (Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International). You may use this build freely in personal/educational/etc use. Commercial use is not allowed with this build! You can contact me by email to discuss creating customized Android builds for commercial purposes.

Do not mirror my builds! Please post a link to this page instead.

lineage-20.0-20230505-UNOFFICIAL-KonstaKANG-rpi4.zip
https://www.androidfilehost.com/?fid=10620683726822051678
md5:e1cd1936734ac949ece2447f24054af6

lineage-20.0-20230505-UNOFFICIAL-KonstaKANG-rpi4-ota.zip (TWRP flashable OTA package)
https://www.androidfilehost.com/?fid=10620683726822051675
md5:49b7951f11628d0f16853b490639fc9f

Working:

Audio (HDMI, 3.5mm jack, USB microphones, bluetooth speakers/headphones, etc)
Audio DAC (using GPIO DACs e.g. Hifiberry DAC+)
Bluetooth (and bluetooth tethering)
Camera (using official Pi camera modules & UVC USB webcams)
GPIO
GPS (using external USB modules e.g. U-Blox 7)
Ethernet
Hardware accelerated graphics (V3D, OpenGL & Vulkan)
Hardware video decoding & encoding (H.265 decoding, H.264 decoding & encoding)
HDMI display (and HDMI-CEC)
I2C
IR remotes (using external GPIO IR modules e.g. TSOP4838)
RTC (using external GPIO I2C modules e.g. DS3231)
Sensors (using external GPIO I2C modules e.g. MPU6050, LSM6DS3, LSM303DLHC, BME280/BMP280, and APDS9930 accelerometer, gyroscope, magnetometer, temperature, pressure, humidity, ambient light, and proximity)
Serial console (using external GPIO serial console adapters e.g. PL2303)
SPI
Touchscreen/multi-touch (official 7” touchscreen, USB touchscreens, Waveshare SPI touchscreens)
USB (mouse, keyboard, storage, etc)
USB-C (ADB, MTP, PTP, USB tethering)
Wifi (and wifi tethering)
Issues:

Hardware video decoding performance varies depending on the selected decoder option and video resolution/bitrate/profile/container/etc
Some third party camera apps don’t work with official Pi camera modules (works with UVC USB webcams)
SELinux is in permissive mode
Encrypting userdata is not supported
and more…