build.xml

<?xml version="1.0" encoding="UTF-8"?>
<project default="package">
  <property file="local.properties"/>
  <property file="project.properties"/>

  <!-- Package properties -->
  <property name="package.name" value="formvalidation" />
  <property name="package.packagename" value="com.voidberg.formvalidation" />

  <path id="android.antlibs">
    <pathelement path="${sdk.dir}/tools/lib/ant-tasks.jar" />
  </path>

  <target name="get-version">
    <taskdef name="xpath" classname="com.android.ant.XPathTask" classpathref="android.antlibs" />
    <xpath input="./AndroidManifest.xml" expression="/manifest/@android:versionName" output="package.versionname" />
    <echo message="${package.versionname}" />
  </target>
  
  <!-- Standard jar stuff -->
  <property environment="env"/>
  <condition property="android.base" value="${sdk.dir}" else="${env.ANDROID_HOME}">
    <isset property="sdk.dir" />
  </condition>
  <fail message="Please set either the sdk.dir property or the ANDROID_HOME environment variable to point to your Android SDK installation.">
    <condition>
      <not>
        <available file="${android.base}" type="dir"/>
      </not>
    </condition>
  </fail>

  <property name="lib.dir" value="${android.base}/platforms/${target}" />
  <property name="build.dir" value="./build"/>
  <property name="classes.dir"  value="${build.dir}/classes"/>
  <buildnumber file="build.num" />

  <!-- Set up classpath -->
  <path id="classpath">
      <fileset dir="${lib.dir}" includes="**/*.jar" />
  </path>
  
  <!-- Build javadoc -->
  <target name="doc">
      <javadoc 
          classpathref="classpath"
          sourcepath="gen:src"
          destdir="doc"
          packagenames="${package.packagename}"
          linkoffline="http://d.android.com/reference ${android.base}/docs/reference" 
          additionalparam="-author  -version"
          />
  </target>

  <!-- Compile java files into classes -->
  <target name="compile">
      <mkdir dir="${build.dir}" />
      <mkdir dir="${classes.dir}" />

      <javac
          includeantruntime="false"
          srcdir="src"
          destdir="${classes.dir}"
          classpathref="classpath"
          debug="true"
          debuglevel="lines,source" />
  </target>

  <!-- Package a jar from compiled class files -->
  <target name="jar" depends="get-version,compile">
      <manifest file="MANIFEST.MF">
          <attribute name="Built-By" value="${user.name}" />
          <attribute name="Implementation-Version" value="${package.versionname}"/> 
      </manifest>

      <jar destfile="releases/${package.name}-${package.versionname}.jar" basedir="build/classes" includes="com/voidberg/formvalidation/**/*.class" manifest="MANIFEST.MF" />
  </target>

  <!-- Clean out the build files -->
  <target name="clean">
      <delete dir="build" />
      <delete dir="doc" />
      <delete>
          <fileset dir="." includes="*.jar"/>
          <fileset file="MANIFEST.MF"/>
      </delete>
  </target>

  <!-- Compile and package a jar -->
  <target name="package" depends="compile,jar" />
</project>