Thanks for the feedback and the screenshot. I agree that having to scroll just to reach OK is inconvenient.
I have reworked the Android color picker for the next update. The HEX input now shares a row with the heading and color preview, while the color wheel is more compact and adapts to the available screen width. The brightness control is positioned vertically beside it.
Most importantly, the Cancel and OK buttons now remain fixed at the bottom and are always accessible without scrolling.