通过 ANE(Adobe Native Extension) 启动Andriod服务 推送消息(二)

着手改造之前，有兴趣可以阅读下官方文档：http://help.adobe.com/zh_CN/air/extensions/index.html

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<String, FREFunction> getFunctions() {

        Map<String, FREFunction> functions = new HashMap<String, FREFunction>();

        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。