README

1. Created new Android module project.
2. Deleted ExampleProxy.java
3. Added MyWindowProxy.java and edited build.xml and module file.
4. ant clean compile, successful build.

AndroidextensionModule.java

/**
 * This file was auto-generated by the Titanium Module SDK helper for Android
 * Appcelerator Titanium Mobile
 * Copyright (c) 2009-2013 by Appcelerator, Inc. All Rights Reserved.
 * Licensed under the terms of the Apache Public License
 * Please see the LICENSE included with this distribution for details.
 *
 */
package com.example.androidextension;

import org.appcelerator.kroll.KrollModule;
import org.appcelerator.kroll.annotations.Kroll;

import org.appcelerator.titanium.TiApplication;
import org.appcelerator.kroll.common.Log;

@Kroll.module(name="Androidextension", id="com.example.androidextension")
public class AndroidextensionModule extends KrollModule
{

  // Standard Debugging variables
	private static final String TAG = "AndroidextensionModule";
}

build.xml

<project name="androidextension" default="dist">
  <description>
		Ant build script for Titanium Android module AndroidExtension
	</description>

	<property name="ti.module.root" location="${basedir}"/>
	<property file="build.properties" />

  <path id="dependencies">
    <filelist>
      <file name="${titanium.platform}/android/modules/titanium-ui.jar"/>
    </filelist>
  </path> 

	<import file="${titanium.platform}/../module/android/build.xml"/>
</project>

MyWindowProxy.java

package com.example.androidextension;

import ti.modules.titanium.ui.WindowProxy;

public class MyWindowProxy  extends WindowProxy {

    public MyWindowProxy() {
        
    }
}