着手改造之前，有兴趣可以阅读下官方文档：

新建工程 NavService 并创建包 nav.wenbo.service, 这些都可以自定义，但要记住你的包名。

注意最下方那个jar包，这个是必需的，打开项目的构建目录(buildPath)，引用外部jar包, 目录在你在Flex sdk目录下

 %FlexSDK%\4.x.x\lib\android\FlashRuntimeExtensions.jar

我的本地目录是:F:\Program Files\Adobe\Adobe Flash Builder 4.7\sdks\4.6.0\lib\android\FlashRuntimeExtensions.jar

首先创建air调用的入口类 ServiceExtension 这个类必需在ane包里面的extension.xml里指定（后面会介绍）

package nav.wenbo.service;import android.content.Context;import android.content.Intent;import android.util.Log;import com.adobe.fre.FREContext;import com.adobe.fre.FREExtension;public class ServiceExtension implements FREExtension {    public static final String TAG = "ServiceExtension";    public static Context appContext;    public static FREContext extensionContext;    public static String Msg = "none";        @Override    public FREContext createContext(String contextType) {        // TODO Auto-generated method stub        return new ServiceExtensionContext();    }    @Override    public void dispose() {        // TODO Auto-generated method stub        Log.d(TAG, "Extension disposed.");    }    @Override    public void initialize() {        // TODO Auto-generated method stub        Log.d(TAG, "Extension initialized.");    }}

 

ServiceExtension中关键是 createContext 方法，这个方法返回一个可连通air及本地Java代码的上下文。并在该上下文中定义可供air调用的方法。

下面是ServiceExtensionContext类

package nav.wenbo.service;import java.util.HashMap;import java.util.Map;import nav.wenbo.service.functions.InitFunction;import nav.wenbo.service.functions.SendFunction;import nav.wenbo.service.functions.StartFunction;import android.util.Log;import com.adobe.fre.FREContext;import com.adobe.fre.FREFunction;public class ServiceExtensionContext extends FREContext {    public static final String TAG = "ServiceExtensionContext";    @Override    public void dispose() {        // TODO Auto-generated method stub        Log.d(TAG,"Context disposed.");    }    @Override    public Map
     
       getFunctions() {        Map
      
        functions = new HashMap
       
        ();        functions.put("init", new InitFunction());        functions.put("service", new StartFunction());        functions.put("send", new SendFunction());                return functions;    }}
       
      
     

 

functions.put相当注册调用逻辑的调用名， 这里把你所有调用方法都填上。init 用于初始化上下文，service用来启动和关闭服务, send用于发送消息。 在编写对应方法之前，

先把上一节的Backgroundservice 移植过来

package nav.wenbo.service;import com.wenbo.navservice.R;import android.app.Activity;import android.app.Notification;import android.app.NotificationManager;import android.app.PendingIntent;import android.app.Service;import android.content.Intent;import android.os.IBinder;import android.util.Log;public class NotificationService extends Service {    private NotificationManager notificationMgr;    private Thread mthr;    private int mCount=0;    private Boolean mSend=true;        @Override    public void onCreate() {        super.onCreate();        notificationMgr = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);        displayNotificationMessage("starting Background Service");                if(mthr == null || mSend == false)         {            mSend=true;            mthr = new Thread(null, new ServiceWorker(), "BackgroundSercie");            mthr.start();        }        if(null != ServiceExtension.extensionContext) ServiceExtension.extensionContext.dispatchStatusEventAsync("start", "1");    }        @Override    public void onDestroy()    {        super.onDestroy();        mSend = false;    }        @Override    public IBinder onBind(Intent intent) {        // TODO Auto-generated method stub        return null;    }    class ServiceWorker implements Runnable {        @Override        public void run() {            // do background processing here.....            // stop the service when done...            // BackgroundService.this.stopSelf()            while(mSend)            {                try{                    Thread.sleep(1000);                    Log.d("", "runnable" + mCount);                    displayNotificationMessage(ServiceExtension.Msg);                }                catch (InterruptedException e)                {                    e.printStackTrace();                }            }        }    }        private void displayNotificationMessage(String message) {        if(message == "none") return;                Log.d("", message);        mCount++;        Notification notification = new Notification(R.drawable.ic_launcher, message,                System.currentTimeMillis());                PendingIntent contentIntent = PendingIntent.getActivity(this, 0, new Intent(this, Activity.class), 0);                notification.setLatestEventInfo(this, "女神之贱", message, contentIntent);                notificationMgr.notify(1000, notification);    }}

 

这里改动很小，发送的消息从ServiceExtension类里面取，当message != none时显示该通知，另ServiceExtension.extensionContext.dispatchStatusEventAsync 是用来给air程序发消息， 在air中监听StatusEvent.STATUS 可以捕获这条消息并获取对应参数。在这里用处是通知服务启动成功。

下面就剩下实际调用的方法了。

首先是初始化上下文，这里主要是ServiceExtension.extensionContext 主要用于往air发消息。

package nav.wenbo.service.functions;import nav.wenbo.service.ServiceExtension;import android.content.Context;import android.util.Log;import com.adobe.fre.FREContext;import com.adobe.fre.FREFunction;import com.adobe.fre.FREObject;public class InitFunction implements FREFunction {    public static final String TAG = "InitFunction";    @Override    public FREObject call(FREContext context, FREObject[] args) {        ServiceExtension.extensionContext = context;                Context appContext = context.getActivity().getApplicationContext();        ServiceExtension.appContext = appContext;                        Log.i(TAG, "in init");                return null;    }}

这里注意了，因为我们没有独立的Android入口文件，我们 只能从 FREContext.getActivity() 来取得我们所需的上下文，并用这上下文启动我们的服务，这是跟前一节例子最大不同的地方。

执行后通知air：context.dispatchStatusEventAsync("start", "2");

package nav.wenbo.service.functions;import nav.wenbo.service.NotificationService;import android.content.Context;import android.content.Intent;import com.adobe.fre.FREContext;import com.adobe.fre.FREFunction;import com.adobe.fre.FREObject;public class StartFunction implements FREFunction {    @Override    public FREObject call(FREContext context, FREObject[] args) {        Context appContext = context.getActivity().getApplicationContext();        Boolean isStart=true;        try {            isStart = args[0].getAsBool();        } catch (Exception e) {                    }        if(isStart) context.getActivity().startService(new Intent(appContext, NotificationService.class));        else context.getActivity().stopService(new Intent(appContext, NotificationService.class));                context.dispatchStatusEventAsync("start", "2");        return null;    }}

 

最后这个最简单，仅仅设置下所要推送的消息.

package nav.wenbo.service.functions;import nav.wenbo.service.ServiceExtension;import com.adobe.fre.FREContext;import com.adobe.fre.FREFunction;import com.adobe.fre.FREObject;public class SendFunction implements FREFunction {    @Override    public FREObject call(FREContext context, FREObject[] args) {        // TODO Auto-generated method stub        String msg="none";        try        {            msg = args[0].getAsString();        }        catch(Exception e)        {                    }        ServiceExtension.Msg = msg;        return null;    }}

做完这些，并设置好权限后，把项目导出jar包, 命名为 libAndroidServiceLib.jar

下一节我将介绍air中跟此jar包对接。