In Android, which Java version should I compile the code for, and how to set it for Ant?

When building an Android application, which Java version should I compile the code for? I'd guess this depends on the "minSdkVersion"? And if so, where can I find the required Java version for each "minSdkVersion"?

And once I determine the Java version I want, how do I set it? I build my project using Ant (from the command line). Currently it seems to always use 1.5 because the "build.xml" file imports "${sdk.dir}/tools/ant/build.xml" which contains:

<property name="java.target" value="1.5" />
<property name="java.source" value="1.5" />
...

<javac ... source="${java.source}" target="${java.target}" ... >

Should I change it there? Is there a way to set it per project?

And is there a way to set the Java version if I build using Eclipse?

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