GamePlay/build.xml

<project name="GamePlay-Android" default="all" basedir=".">
  <macrodef name="build-native">
    <attribute name="location"/>
    <sequential>

      <!-- Non-Windows execs -->
      <exec osfamily="unix" dir="@{location}/android" executable="android">
        <arg value="update"/>
        <arg value="project"/>
        <arg value="-t"/>
        <arg value="1"/>
        <arg value="-p"/>
        <arg value="."/>
        <arg value="-s"/>
      </exec>
      <exec osfamily="unix" dir="@{location}/android" executable="ndk-build"/>

      <!-- Windows execs -->
      <exec osfamily="windows" dir="@{location}/android" executable="cmd">
        <arg value="/c"/>
        <arg value="android.bat"/>
        <arg value="update"/>
        <arg value="project"/>
        <arg value="-t"/>
        <arg value="1"/>
        <arg value="-p"/>
        <arg value="."/>
        <arg value="-s"/>
      </exec>
      <exec osfamily="windows" dir="@{location}/android" executable="cmd">
        <arg value="/c"/>
        <arg value="ndk-build"/>
      </exec>

    </sequential>
  </macrodef>

  <target name="all">
    <build-native location="gameplay"/>
    <build-native location="samples/browser"/>
    <build-native location="samples/character"/>
    <build-native location="samples/lua"/>
    <build-native location="samples/mesh"/>
    <build-native location="samples/particles"/>
    <build-native location="samples/racer"/>
    <build-native location="samples/spaceship"/>
  </target>
</project>