The first letter is the code name of the release family, e.g. F is Froyo. The second letter is a branch code that allows Google to identify the exact code branch that the build was made from, and R is by convention the primary release branch. The next letter and two digits are a date code.

What is build version in Android?

versionCode is a number, and every version of the app you submit to the market needs to have a higher number than the last. VersionName is a string and can be anything you want it to be. This is where you define your app as “1.0” or “2.5” or “2 Alpha EXTREME!” or whatever.

Where is build number in Android?

Go to Settings > System > About phone. Tap Software info > Build number. Tap Build number seven times. After the first few taps, you should see the steps counting down until you unlock the developer options.