Adding custom text to the lockscreen

I have an app I made that will display what percent my battery is at (the 32 in the notification bar). I am wondering is it possible to add that information to the lockscreen (maybe under the time, but anywhere would work)? I know I can change the "I can see you" text via Settings -> General -> Screen lock -> Owner info (I am running Android 4.1.1), but I wouldn't be able to update that with the battery percent. From what I can gather I would need to write my own lock screen and add it there. Is that true or is there another way?

Where I would like information added

Solution

You are welcome to write an app widget that can be placed on the lockscreen, for Android 4.2+.