This is a sample IME for use with a rotary controller. It is intentionally very basic so that it‘s easy to understand the code. It doesn’t support multiple locales / layouts. It doesn't support password fields, numeric fields, etc.
make RotaryIME
adb install out/target/product/[hardware]/system/app/RotaryIME/RotaryIME.apk
Then build and install CarRotaryController
. There is no need to enable this IME or select it; the RotaryService
will select it automatically in rotary mode.