I use native emacs on android. Besides using "Unexpected Keyboard" i also show a row of mod keys
(add-hook 'after-init-hook
(lambda ()
(when (fboundp 'tool-bar-mode)
(tool-bar-mode 1)
(set-frame-parameter nil 'tool-bar-position 'bottom))
(when (fboundp 'modifier-bar-mode)
(modifier-bar-mode 1))))
