custom_rules.xml

<?xml version="1.0" encoding="UTF-8"?>
<project>

    <available file="assets/app.properties" property="app.properties.present"/>

    <target name="-setup-properties" unless="app.properties.present">
      <copy file="assets/app.properties-prod" tofile="assets/app.properties"/>
    </target>

    <target name="-pre-build" depends="-setup-properties">

      <property name="gmetric4j.absolute.dir" location="gmetric4j"/>
      <subant buildpath="${gmetric4j.absolute.dir}" antfile="build.xml"/>
      <copy file="${gmetric4j.absolute.dir}/gmetric4j.jar" todir="${jar.libs.absolute.dir}"/>
      <copy todir="${jar.libs.absolute.dir}">
        <fileset dir="${gmetric4j.absolute.dir}/lib">
          <include name="**/oncrpc-1.0.7.jar"/>
        </fileset>
      </copy>

      <property name="ice4j.absolute.dir" location="ice4j"/>
      <subant buildpath="${ice4j.absolute.dir}" antfile="build.xml"/>
      <copy file="${ice4j.absolute.dir}/ice4j.jar" todir="${jar.libs.absolute.dir}"/>
      <copy todir="${jar.libs.absolute.dir}">
        <fileset dir="${ice4j.absolute.dir}/lib">
          <include name="**/*.jar"/>
        </fileset>
      </copy>

      <property name="opentelecoms.org-util.absolute.dir" location="opentelecoms.org-util"/>
      <subant buildpath="${opentelecoms.org-util.absolute.dir}" antfile="build.xml"/>
      <copy file="${opentelecoms.org-util.absolute.dir}/opentelecoms.org-util.jar" todir="${jar.libs.absolute.dir}"/>

      <property name="pbkdf2.absolute.dir" location="pbkdf2"/>
      <subant buildpath="${pbkdf2.absolute.dir}" antfile="build.xml"/>
      <copy file="${pbkdf2.absolute.dir}/pbkdf2.jar" todir="${jar.libs.absolute.dir}"/>

      <property name="opentelecoms.org-zrtp.absolute.dir" location="zrtp/zorg-java"/>
      <subant buildpath="${opentelecoms.org-zrtp.absolute.dir}" antfile="build.xml"/>
      <copy file="${opentelecoms.org-zrtp.absolute.dir}/opentelecoms.org-zrtp.jar" todir="${jar.libs.absolute.dir}"/>

        <dependency
                libraryFolderPathOut="project.library.folder.path"
                libraryPackagesOut="project.library.packages"
                libraryManifestFilePathOut="project.library.manifest.file.path"
                libraryResFolderPathOut="project.library.res.folder.path"
                libraryBinAidlFolderPathOut="project.library.bin.aidl.folder.path"
                libraryNativeFolderPathOut="project.library.native.folder.path"
                jarLibraryPathOut="project.all.jars.path"
                targetApi="${project.target.apilevel}"
                verbose="${verbose}" />

    </target>

</project>