the floating actin button brings you one step closer to the professional app feel! check it out
the concept is pretty simple once you try it a few times. place a column on the screen. that becomes your screen now. make the screen not scrollable. make the column scrollable. add any screen content to the column.
now add a row, above the column in the component tree. make the row height 8px. st the row positioning to absolute. position the row where you want it. then add a button.