AIR Native Extension on Android emulator

参考
1、官网教程：http://help.adobe.com/en_US/air/extensions/index.html
2、官网教材：http://www.adobe.com/devnet/air/articles/developing-native-extensions-air.html
3、网易博客：http://sswilliam.blog.163.com/blog/#m=0&t=3&c=nativeextension

开发目标
1、在Android模拟器上运行的AIR程序
2、可以调用Native的方法
3、可以接受Native发的事件

开发准备

1、Flash Builder4.5
2、AIRSDK3

FB支持Android开发
1、安装ADT
2、设置Android的SDK目录

准备文件夹
1、总目录：HelloANE
2、存放Native的目录：Native
3、存放Flex库目录：HelloANELibrary
4、存放App目录：HelloANESample

创建Native
1、在FB中创建Android项目：
      1、新建项目时选择Android project
      2、设路径为前面的Native
      3、Build target选择3.2
      4、Package名为：com.mydomain.example.android.helloANE
2、允许该项目使用AS提供的Extension功能
      1、打开该工程属性对话框
      2、在Java Build Path中，右部选择Libraries，点击“Add External JARs”，选择FB的SDK目录中lib/android里的FlashRuntimeExtensions.jar。
3、创建Extension类      

package com.mydomain.example.android.helloANE;

import com.adobe.fre.FREContext;
import com.adobe.fre.FREExtension;

public class Extension implements FREExtension {

	@Override
	public FREContext createContext(String arg0) {
		// TODO Auto-generated method stub
		return new ExtensionContext();
	}

	@Override
	public void dispose() {
		// TODO Auto-generated method stub

	}

	@Override
	public void initialize() {
		// TODO Auto-generated method stub

	}
}

4、创建ExtensionContext类      

package com.mydomain.example.android.helloANE;

import java.util.Map;
import java.util.HashMap;

import com.adobe.fre.FREContext;
import com.adobe.fre.FREFunction;

public class ExtensionContext extends FREContext {

	@Override
	public void dispose() {
		// TODO Auto-generated method stub

	}

	@Override
	public Map<String, FREFunction> getFunctions() {
		// TODO Auto-generated method stub
		Map<String, FREFunction> functionMap = new HashMap<String, FREFunction>();
		
		functionMap.put("initMe", new InitFunction());
		functionMap.put("isSupported", new SupportedFunction());
		functionMap.put("Work", new WorkFunction());
		
		return functionMap;
	}
}

5、创建InitFunction类      

package com.mydomain.example.android.helloANE;

import com.adobe.fre.FREContext;
import com.adobe.fre.FREFunction;
import com.adobe.fre.FREObject;

public class InitFunction implements FREFunction {

	@Override
	public FREObject call(FREContext arg0, FREObject[] arg1) {
		// TODO Auto-generated method stub
		return null;
	}

}

6、创建SupportedFunction类      

package com.mydomain.example.android.helloANE;

import com.adobe.fre.FREContext;
import com.adobe.fre.FREFunction;
import com.adobe.fre.FREObject;
import com.adobe.fre.FREWrongThreadException;

public class SupportedFunction implements FREFunction {

	@Override
	public FREObject call(FREContext arg0, FREObject[] arg1) {
		// TODO Auto-generated method stub
		FREObject result = null;
		
		try
		{
			result = FREObject.newObject(true);
		}
		catch(FREWrongThreadException e)
		{
			e.printStackTrace();
		}
		
		return result;
	}
}

7、创建Work类

package com.mydomain.example.android.helloANE;

import com.adobe.fre.FREContext;
import com.adobe.fre.FREFunction;
import com.adobe.fre.FREObject;
import com.adobe.fre.FREWrongThreadException;
import com.mydomain.example.android.helloANE.MyThread;
import android.util.*;

public class WorkFunction implements FREFunction {

	@Override
	public FREObject call(FREContext arg0, FREObject[] arg1) {
		// TODO Auto-generated method stub
		FREObject result = null;
		
		try
		{
			Log.i("WorkFunction+Call", "Enter");
			
			MyThread thread = new MyThread(arg0);
			thread.start();
			
			result = FREObject.newObject("Native");
		}
		catch(FREWrongThreadException e)
		{
			e.printStackTrace();
		}
		
		return result;
	}
}

8、创建MyThread类

package com.mydomain.example.android.helloANE;
import android.util.*;

import com.adobe.fre.*;

public class MyThread extends Thread {
	private FREContext MyExt = null;
	public MyThread(FREContext ext)
	{
		Log.i("MyThread Constructor", "Enter");
		MyExt = ext;		
	}
	
	public void run()
	{
		Log.i("MyThread run", "Enter");
		MyExt.dispatchStatusEventAsync("BACK", "");
	}
}

9、导出JAR

创建AS库
1、创建Flex Library工程，名称为HelloANELibrary，确保Include AIR
2、创建一个AS的Class

package com.mydomain.nativeExtension.Work2
{
	import flash.events.EventDispatcher;
	import flash.events.IEventDispatcher;
	import flash.external.ExtensionContext;
	import flash.events.StatusEvent;
	
	public class Work extends EventDispatcher
	{
		private static var extContext:ExtensionContext = null;
		private static var isCallBack:Boolean = false;
		public function Work(target:IEventDispatcher=null)
		{
			super(target);
			if(!extContext)
			{
				extContext = ExtensionContext.createExtensionContext("com.mydomain.example","");
				extContext.addEventListener(StatusEvent.STATUS, OnStatus);
				extContext.call("initMe", null);
			}
		}
		
		public static function get isSupported():Boolean
		{
			return extContext.call("isSupported", null) as Boolean;
		}
		
		public static function OnStatus(event:StatusEvent):void
		{
			isCallBack = true;
		}
		
		public function Action():String
		{
			if(isCallBack)
			{
				return "isCallBack is true";
			}
			else
			{
				return extContext.call("Work", null) as String;
			}
		}
	}
}

打包ANE
1、在Flex Library的bin目录下建立一个文件夹“Android-ARM”。这个文件夹用于存放针对Android的ANE文件，因为有可能一份AS库代码产生多种平台的代码。
2、提取SWF。用WINRAR打开SWC，把Library.swf提取出来，和swc放在同一目录下
3、准备extension.xml，描述native

<extension xmlns="http://ns.adobe.com/air/extension/2.5">
	<id>com.mydomain.example</id>
	<versionNumber>1</versionNumber>
	<platforms>
		<platform name="Android-ARM">
			<applicationDeployment>
				<nativeLibrary>HelloANENative.jar</nativeLibrary>
				<initializer>com.mydomain.example.android.helloANE.Extension</initializer>
			</applicationDeployment>
		</platform>
	</platforms>
</extension>

4、在bin目录下准备证书文件
5、在bin目录下准备批处理如下

set adt_dir="D:\Program Files\Adobe\Adobe Flash Builder 4.5\sdks\AIRSDK3\bin"
set sign=-storetype pkcs12 -keystore wvw.p12 -storepass geheim

%adt_dir%\adt -package %sign% -tsa none -target ane Android-ARM\Helloane.ane extension.xml -swc HelloANELibrary.swc -platform Android-ARM library.swf HelloANENative.jar

6、运行批处理，如正常，将在Android-ARM下产生ane文件

创建使用Extension的App
1、创建一个Flex Mobile工程，名称为HelloANESample，Mobile Setting选择Blank，Target为Android，第四步中通过“Add Project”加入前面的Flex库工程
2、在App描述文件中（HelloANESample-app.xml）加入对extension的描述，如下

<extensions>
		<extensionID>com.mydomain.example</extensionID>
</extensions>

3、界面代码如下

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
			   xmlns:s="library://ns.adobe.com/flex/spark">
	<fx:Script>
		<![CDATA[
			import com.mydomain.nativeExtension.Work2.Work;
			
			import mx.events.FlexEvent;
			
			private var Ext:Work = null;
			protected function button1_clickHander(event:MouseEvent):void
			{
				if(Ext == null)
				{
					Ext = new Work();
				}
				this.output.text = Ext.Action();
			}
		]]>
	</fx:Script>
	
	<fx:Declarations>
		<!-- Place non-visual elements (e.g., services, value objects) here -->
	</fx:Declarations>
	<s:Button x="370" y ="10" label="Button" click ="button1_clickHander(event)"/>
	<s:Label x="370" y ="10" width="100" id="output" text="label" />
</s:Application>

打包APK
1、把证书拷贝至App的输出目录
2、提供批处理如下

set adt_dir="D:\Program Files\Adobe\Adobe Flash Builder 4.5\sdks\AIRSDK3\bin"
set sign=-storetype pkcs12 -keystore wvw.p12 -storepass geheim

%adt_dir%\adt -package -target apk-emulator %sign% myApp.apk HelloANESample-app.xml HelloANESample.swf -extdir D:\Code\HelloANE\HelloANELibrary\bin\Android-ARM

3、成功运行会在当前目录下生成myApp.apk

在模拟器上安装运行
1、启动3.2的模拟器
2、安装apk
3、运行，第一次按按钮，界面上文字会显示Native，第二次之后则显示“isCallBack is true”。