Droidio to the Rescue!
This is a very short and simple tip, but it is valuable enough to deserve a place in CodeProject's illustrious archives.
When using Droidio (Android Studio), you can see every change you've ever made to the file with which you're currently working by clicking in that file (such as MainActivity.java) and selecting "Local History > Show History" from the context menu.
You will be rewarded with a window showing every change you've made, and color-coded to boot, to indicate whether you deleted (grey), or changed (blue), or inserted (green) the code in question, with the previous version of the code on the left, and the current version of the code on the right:
You can, of course, do all this with fancy-pants version control systems, but these usually require setup and lots of hand-wringing and mind-numbing arcana (IOW, they can be a pain in the Dapple). Droidio makes this "poor man's version control" as easy as pie. It's not really version control per se, but it is "code change examination" that is accomplished with absolutely no effort, or need to remember, anything, or even explicitly save the code - it just happens; it just works!
Hats off to the cats behind Droidio for this!
But this is not all - if you just want to quickly see recent changes of your work, take note of this tip (tips are shown when you start Droidio, until (and if) you opt out of them displaying:
