Make an android keyboard app with a new design

I have a new design keyboard i wish to make an app ofI wish the graphics to be sharp and pleasing like a conventional keyboard, I wish the usual keyboard functions which need to integrate with the devises android os, spell check, suggestion, auto capitalise, auto correct, predict , etc standard features, upper case lower case, symbols emoji pages, dictation key, key bubble etc These are specific functionalities i wish incorporated First key touched last key touched, most percent of key touched. Other than the wire frame which is simple enough, the key press is very important. If i press a key i need the largest area pressed for the largest time. For example if i am pressing 75 percent of the "a" key for 0.5 seconds, 25 percent of the "s" key for 1 second and 33 percent of the "w" key for 0.75 seconds the "a" key would register, mathmatecally this adds up (0.375 versus 0.24 versus 0.25). There are specifics like this that I wish, how easy is your coding to alter things like this ? Lots of tweaks until i like it ? I know it seems simple just altering he wire frame but to make it usable is another thing. Landscape/ portrate mode. The keyboard will switch aspect. Buffer to become non registering inert, ie if touched before key key still registers. Ie it is supposed to be a non entity as if the keys where surrounded by a void. The buffer zone could be dispensed with altogether and have a different wireframe to the keyboard graphics. Height adjustable and Width adjustable the dimensions of the keyboard. I wish to be adjustable as different device sizes mean the keyboard varies in size where as the thumbs stay the same, meaning the keyboard can be uncomfortable to use. Movable keyboard. The keyboard could do with being repositionable due to smartphones getting longer, the base of the keyboard could move up to the middle of the device, perhaps in 5 increments of 1/10 ths Key font size adjustable )for different device sizes How are the preferences going to be adjusted from app screen or as a mixture of on keyboard adjustments and from the original on devce controls ? Height adjustable (separate settings for landscape and portrate) Width adjustable(separate settings for landscape and portrate) Auto correct prediction Key bubble etc Keyboardposition(separate for landscape and portrate)