build.xml

<project name="slf4j-on-android" default="build" basedir=".">
    <description>Build file for SLF4j on Android</description>

    <property name="src" location="src" />
    <property name="tmp" location="tmp" />
    <property name="bin" location="bin" />
    <property name="lib" location="lib" />
    <property name="javadoc" location="javadoc" />
    <property name="external" location="external" />
    <property name="sources" location="sources" />

    <property name="slf-version" value="1.6.2"/>

    <property name="jar" location="${lib}/${ant.project.name}-${slf-version}.jar" />
    <property name="sources-filename" value="${ant.project.name}-${slf-version}" />

    <property environment="env"/>
    <property name="android.home" value="${env.ANDROID_HOME}"/>
	<!-- Default android version is 8 currently.
		This relies on properties being immutable in ant so won't override if set in the env already -->
	<property name="env.ANDROID_VERSION" value="8"/>
	<property name="android.version" value="${env.ANDROID_VERSION}"/>

    <!-- Is the android.jar in an old style SDK or a new one? -->
    <available file="${android.home}/android.jar" property="android.jar" value="${android.home}/android.jar" />
    <available file="${android.home}/platforms/android-${android.version}/android.jar" property="android.jar" value="${android.home}/platforms/android-8/android.jar" />
    <fail message="Unable to find android.jar" unless="android.jar" />

    <path id="external_jars">
        <fileset dir="${external}/slf4j-${slf-version}">
            <include name="slf4j-api-${slf-version}.jar" />
        </fileset>
	<fileset file="${android.jar}" />
    </path>

    <target name="build">
        <!-- Create the build directory structure used by compile -->
        <delete dir="${lib}" />
        <delete dir="${tmp}" />
        <delete dir="${javadoc}" />
        <delete dir="${sources}" />

        <mkdir dir="${tmp}" />
        <mkdir dir="${lib}" />
        <mkdir dir="${javadoc}" />
        <mkdir dir="${sources}" />

        <!-- Compile the java code from ${src} into ${tmp} -->
        <javac srcdir="${src}" destdir="${tmp}" target="1.5" debug="on">
            <classpath refid="external_jars" />
            <compilerarg value="-Xlint:unchecked" />
        </javac>

        <!-- create the javadoc -->
        <javadoc destdir="javadoc" access="public" sourcepath="${src}" >
            <classpath refid="external_jars" />
            <link href="http://www.slf4j.org/apidocs/" />
        </javadoc>

        <!-- Put everything in ${tmp} into the jar file -->
        <jar jarfile="${jar}" basedir="${tmp}" />

        <!-- create a zip file with the sources -->
        <zip destfile="${sources}/${sources-filename}.zip">
            <zipfileset dir="src"
                        includes="**/*.java"
                        prefix="${sources-filename}" />
        </zip>
    </target>

    <target name="clean" description="clean up">
        <delete dir="${lib}" />
        <delete dir="${tmp}" />
        <delete dir="${javadoc}" />
        <delete dir="${sources}" />
	<delete dir="${bin}" />
    </target>

</project>