Validators for android by Ruswizards (ruswizards.com).
Simple and minimalistic validators that allow to validate multiple condition by one validator, check multiple validators by one call.
Easily extendable.
To build your own jar:
1. clone progect from gitHub
2. open ".classpath" file and change line <classpathentry kind="lib" path="C:/Program Files (x86)/Android/android-sdk/platforms/android-7/android.jar"/> to correspond your SDK location like
 <classpathentry kind="lib" path="%MY_ANDOID_PLATFORM_JAR%"/>. 
3. Import project into eclipse
4. Build
You could also change path to jar directly from project properties in Eclipse after import.