You don't need a full-blown word processor to edit plain text files since a simple text editor fits the bill with less distraction. More so when we are using a mobile device that has a limited screen size. JotterPad reviewed a text editor for Android with a minimalist user interface, but now it has an advertisement banner taking up the screen real estate to aggressively promote its paid-for version. If you dislike such advertisement, it is time to look for a good alternative like Writer Plus, which is an enhanced version of James McMinnin's Writer and yet it is free of cost and distraction.