If you're using Ant, we've made it very easy to keep building with Crashlytics enabled. Just follow these steps to get up and running.
Add any of these locations to your POM.xml, if you need a bit more of a custom setup.
<property name="crashlytics.project.path" location="PROJECT.ROOT"/>
<property name="crashlytics.manifest.path" location="MANIFEST.PARENT/AndroidManifest.xml"/>
<property name="crashlytics.res.path" location="RES.PARENT/res"/>
Refer to the comments at the top of the crashlytics_build.xml file, if your ant build differs significantly from those provided with the Android SDK.