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Just need two tabs: keyboard and settings

Keyboard

where user types

qwerty keyboard

1-9 hide behind q row

symbol tab * 2

emoji

For better UX, layout should be similar to Gboard shown below.

GboardTheme

Setting

where user adjust the feedback speed and etc.

Setting
Feedback style: flash/sound/vibration(strength);
Feedback per: char/word/sentence
WPM adjuster: slider 0 - 18 and 18 -

Java

Visual/Audio/Haptic feedback

Timing

< 18 WPM: Farnsworth timing

>= 18 WPM: standard

dit = 1 unit
dah = 3 units
Intra-character space (the gap between dits and dahs within a character): 1 unit
Inter-character space (the gap between the characters of a word): 3 Farnsworth-units
Word space (the gap between two words): 7 Farnsworth-units

Keypad typing

! KeybaordView deprecated in API 29

Candidate view section

Character/symbol section

set each key as buttons -> bind all keys to onClick() -> transfer the content to input

exception: backspace, shift, switch to numpad, setting, done, emoji, (?)space

Implantation

Detailed Class design

Translator.java: convert string to morse code, vice versa.

Feedback.java: output morse code into visual/audio/haptic. Tune timing if output speed is lower 18 WPM.

MorseCode.java: Wrap Signal into SignalSequence, similar to CharSequence.