AntでAndroidのpackageをビルド時に変更する ref: http://qiita.com/gin0606/items/c017f60b7276c882dc70

file0.xml

<target name="-package-resources" depends="-crunch">
  <exec executable="${aapt}" failonerror="true">
    <arg value="package" />
    <arg value="-f" />
    <arg value="--auto-add-overlay" />
    <arg value="-M" />
    <arg path="${basedir}/AndroidManifest.xml" />
    <arg value="-S" />
    <arg path="${resource.absolute.dir}" />
    <arg value="-I" />
    <arg path="${project.target.android.jar}" />
    <arg value="-F" />
    <arg path="${out.absolute.dir}/${resource.package.file.name}" />
    <arg value="--rename-manifest-package" />
    <arg value="${your.app.package}" />
  </exec>
</target>