list input methods on android

adb shell
~$ ime
usage: ime list [-a] [-s]
ime enable ID
ime disable ID
ime set ID

The list command prints all enabled input methods. Use
the -a option to see all input methods. Use
the -s option to see only a single summary line of each.

The enable command allows the given input method ID to be used.

The disable command disallows the given input method ID from use.

The set command switches to the given input method ID.
~$ ime list -s
com.google.android.inputmethod.latin/com.android.inputmethod.latin.LatinIME
com.google.android.apps.handwriting.ime/.HandwritingIME
com.google.android.googlequicksearchbox/com.google.android.voicesearch.ime.VoiceInputMethodService
~$ ^D