plugin.xml

<?xml version="1.0" encoding="UTF-8"?>
<plugin xmlns="http://www.phonegap.com/ns/plugins/1.0" id="cordova-plugin-proguard" version="2.2.0">
  <name>Cordova plugin ProGuard</name>
  <description>Activated ProGuard for Android</description>

  <platform name="android">
    <framework src="build.gradle" custom="true" type="gradleReference" />
    <asset src="proguard-custom.txt" target="proguard-custom.txt" />
    <hook type="before_plugin_install" src="scripts/androidBeforeInstall.js" />
  </platform>
</plugin>