build.xml

<project name="GoodreadsAPI" default="jar" basedir=".">
  <description>Goodreads Web Service API Interface</description>

	<property name="src.dir" location="src" />
	<property name="lib.dir" location="lib" />
	<property name="build.dir" location="build" />

  <!-- The local.properties file is created and updated by the 'android' tool.
       It contains the path to the SDK. It should *NOT* be checked into
       Version Control Systems. -->
  <property file="local.properties" />

  <!-- if sdk.dir was not set from one of the property file, then
       get it from the ANDROID_HOME env var.
       This must be done before we load project.properties since
       the proguard config can use sdk.dir -->
  <property environment="env" />
  <condition property="sdk.dir" value="${env.ANDROID_HOME}">
      <isset property="env.ANDROID_HOME" />
  </condition>

  <!-- quick check on sdk.dir -->
  <fail
          message="sdk.dir is missing. Make sure to generate local.properties using 'android update project' or to inject it through the ANDROID_HOME environment variable."
          unless="sdk.dir"
  />

	<path id="build.classpath">
		<fileset dir="${lib.dir}">
			<include name="**/*.jar" />
		</fileset>
		<fileset dir="${sdk.dir}">
			<include name="platforms/android-8/android.jar"/>
		</fileset>
	</path>


  <!-- set global properties for this build -->
  <property name="src" location="." />
  <property name="bin" location="bin" />

	<target name="init">
		<tstamp/>
		<mkdir dir="${build.dir}"/>
	</target>
	
	<target name="compile" depends="init">
		<javac srcdir="${src.dir}" destdir="${build.dir}" classpathref="build.classpath" includeantruntime="false" />
	</target>

  <target name="jar" depends="compile" description="Generate a jar">
	
		<mkdir dir="${build.dir}/lib"/>
    <jar destfile="${build.dir}/lib/goodreads-api.jar" basedir="${build.dir}">
		<!-- replace 'com' by what ever you are using -->
		<!-- as first part of the package name -->
		<!-- e.g. de, org, ... -->
		<!-- the ** is important to include the directory recursively -->
			<include name="com/**" />
    </jar>
  </target>

	<target name="clean" description="clean up">
		<delete dir="${build.dir}"/>
	</target>
</project>