ant rule to prefix APK version code depending on the native code of the APK being generated. useful for Visual Studio 2015 Android projects.

custom_rules.xml

<?xml version="1.0" encoding="utf-8"?>
<project name="custom_rules">

  <available file="libs/x86" property="x86Dir.exists"/>
  <available file="libs/armeabi-v7a" property="armDir.exists"/>

  <target name="-pre-build-x86" if="x86Dir.exists" unless="armDir.exists">
    <echo>prefixing version code with 5 (for x86 ABI).</echo>
    <replaceregexp file="AndroidManifest.xml" match="android:versionCode.*([0-9]+).*"
        replace='android:versionCode="5\1"'/>
  </target>

  <target name="-pre-build-arm" if="armDir.exists" unless="x86Dir.exists">
    <echo>prefixing version code with 3 (for armeabi-v7a ABI).</echo>
    <replaceregexp file="AndroidManifest.xml" match="android:versionCode.*([0-9]+).*"
        replace='android:versionCode="3\1"'/>
  </target>

  <target name="-pre-build" depends="-pre-build-x86,-pre-build-arm" />

</project>