Simple Task List (com.rofaxen.simpletasklist) on Google Play
This is an extremely simple task list. This is the support version, if you like the free consider buying this so I can create more apps like it, if you have not tried the free version feel free to check that out first. This task list is not for people who like features and extra widgets, it is a bare bones version of a task list, you only have one list and the only option is to add items and then mark them done. I like google keep for a full featured task list but I wanted this for the times I needed to make a list real quick and then check everything off equally quickly and I didn't want to deal with all those extra features. I hope you'll find it useful.