I recently found out at work we're limiting our Java target to 1.1, because there are supposedly still Android phones that only support up to that version. I've been trying to Google which versions of Java are installed on the different version of Android (unless they do get updated, then what is the minimum version that's included?), and have had no such luck in my search. 

So, I'm trying to find out what is realistically the best minimum target for Java on Android. Know of any good sources detailing the versions of Java used across Android devices? 

[Edit]
For clarification, we're using the Java SDK to build a jar, then packaging it into the apk. So I do need to know a specific Java SDK target, not the Android API level.