build.xml

<project default="all">
	<property environment="env"/>
	<property name="src.dir" value="src"/>
	<property name="bin.dir" value="bin"/>
	<property name="test.dir" value="test"/>
	<property name="res.dir" value="resource"/>
	<property name="junit" value="${env.JUNIT_HOME}"/>
	<property name="android.dir" value="${env.ANDROID_HOME}"/>
	<property name="android.version" value="${env.ANDROID_VERSION}"/>
	<property name="android.sdk.dir" value="${android.dir}/platforms/android-${android.version}"/>
	<property name="cp" value="${bin.dir}:${android.sdk.dir}/android.jar"/>

	<target name="dirs">
		<mkdir dir="${bin.dir}"/>
		<mkdir dir="${test.dir}"/>
	</target>

	<target name="all" depends="main,test,jar"/>

	<target name="main" depends="dirs">
		<javac includeantruntime="false" classpath="${cp}" debug="on" srcdir="${src.dir}" destdir="${bin.dir}">
			<compilerarg value="-Xlint:all"/>
		</javac>
	</target>

	<target name="clean">
		<delete dir="${bin.dir}"/>
		<delete file="util.jar"/>
	</target>

	<target name="jar" depends="copyFiles">
		<jar destfile="util.jar" basedir="bin" manifest="manifest.txt">
		</jar>
	</target>
	
	<target name="copyFiles">
	    <!-- Any extra files (resources, etc.) you need in the JAR, copy them here.
		<copy todir="${bin.dir}/resource">
			<fileset dir="${res.dir}" />
		</copy>
		-->
	</target>

	<target name="test">
		<javac includeantruntime="false" classpath="${cp};${junit}/junit-4.8.2.jar" debug="on" srcdir="${test.dir}" destdir="${bin.dir}">
			<compilerarg value="-Xlint:all"/>
		</javac>
	</target>
</project>