How do I reference external jar files in a common directory (not libs) to build android project using ant?

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In the sdk, there are ant files under tools/ant. In main_rules.xml, you can find the following code section:

<!-- Directory for the third party java libraries -->
<property name="jar.libs.dir" value="libs" />
<property name="jar.libs.absolute.dir" location="${jar.libs.dir}" />
<!-- create a path with all the jar files, from the main project and the
     libraries -->
<path id="jar.libs.ref">
    <fileset dir="${jar.libs.absolute.dir}" includes="*.jar" />
    <path refid="project.libraries.jars" />
</path>

This is how the ant build code determines where to get the jars from. You could overload the value of jar.libs.dir in your build.properties since that is read before this section and would overload the value. Pointing that at a common directory you intend to use will do what you are suggesting. You may need to play with it some to get it to work the way you want.

One caveat is that I’m not sure if this will negatively impact other build life cycle activities.

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