Hey, I thought I might help out. I made a class in Java that extends the LCD20x4 Bricklet allowing you to write text without having to specify the lines. I plan to add more functions to it though (word wrap etc).
This allows you to use all the functions of the standard class as well as the new ones.
Usage:
Bricklet20x4Writer LCD = new Bricklet20x4Writer("UIDHERE");
ipcon.addDevice(LCD);
LCD.clearDisplay();
LCD.writeText("The maximum this screen can hold is 80 characters anything over will be removed!");
EDIT: https://github.com/samvaughton/TinkerTools -> This is where I'm working on it, up to date version there.
Link to the class (call your class file "BrickletLCD20x4Writer.java")
http://pastebin.com/vZ2E728y