service和intentservice之间的通信

Question

我是 Android 开发的新手，我尝试对 service 和 intentservice 进行一些练习。

这是我的服务class:

public class MyBaseService extends Service {

private double[] returnData;

public MyBaseService() {
}

@Override
public void onCreate() {
    returnData = new double[//dataSise];
}

/** The service is starting, due to a call to startService() */
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    try {
        for (Map.Entry<Integer, Double[]> mapEntry : dataMap.entrySet()) {

            doXYZ(mapEntry.getValue());
            Arrays.sort(returnData);
        }
    } catch (IOException e) {
        e.printStackTrace();
    }

    Intent intents = new Intent();
    intents.setAction(ACTION_SEND_TO_ACTIVITY);
    sendBroadcast(intents);
    return START_STICKY;
}

/** A client is binding to the service with bindService() */
@Override
public IBinder onBind(Intent arg0) {
    return mBinder;
}

public class MyBinder extends Binder {
    public MyBaseService getService() {
        return MyBaseService.this;
    }
}

/** Called when a client is binding to the service with bindService()*/
@Override
public void onRebind(Intent intent) {

}

/** Called when The service is no longer used and is being destroyed */
@Override
public void onDestroy() {
    super.onDestroy();
}


private void doXYZ(double[] data) {
    int gallerySize = galleryFiles.length;

    for (int i=0; i<data.length; ++i) {
        Intent cfIntent = new Intent(this, MyIntentService.class);
        compareFeatureIntent.putExtra(MyIntentService.COMPARING_INDEX, i);
        startService(cfIntent);
    }

}

BroadcastReceiver mReceiver;

// use this as an inner class like here or as a top-level class
public class MyReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        int index = intent.getIntExtra(MyIntentService.COMPARING_INDEX, 0);
        double scores = intent.getDoubleArrayExtra(MyIntentService.COMPARING_SCORE);
        data[index] = scores[0];
    }

    // constructor
    public MyReceiver(){
    }
}

}

这是 intentservice class:

public class MyIntentService extends IntentService {
protected static final String ACTION_COMPARE_FEATURES = "CompareFeatures";
protected static final String COMPARING_SCORE = "Score";
protected static final String COMPARING_INDEX = "Index";

public MyIntentService() {
    super("MyIntentService");
}

@Override
protected void onHandleIntent(Intent intent) {

    int index = (int)intent.getLongExtra(COMPARING_INDEX, 0);

    // This is long operation
    double[] scores = getScores(index);

    Intent intents = new Intent();
    intents.setAction(ACTION_COMPARE_FEATURES);
    intent.putExtra(COMPARING_SCORE, scores);
    intent.putExtra(COMPARING_INDEX, index);
    sendBroadcast(intents);
}

}

场景是我想在 main activity 中启动 MyBaseService class。在 MyBaseService 内部，我需要做一个很长的运行操作，并且需要多次迭代该操作。所以，我把那个长操作放在 MyIntentService 中，然后循环启动 MyIntentService。

MyIntentService 会产生一些数据，我想在 MyBaseService class 中取回这些数据以做一些进一步的操作。

我在 MyBaseService 和 MyIntentService 之间的通信中遇到的问题。因为MyBaseService会多次启动MyIntentSerice，我最初的解决方案是从MyIntentService中调用sendBroadcast()，在MyBaseService中注册receiver。

那么，我的问题是：

我使用 MyBaseService MyIntentService 的设计是否高效？如果没有，我应该怎么做才能得到我想要的结果？
如果sendBroadcast()是一个正确的方向，我应该如何注册MyBaseService？

Answer 1

您的架构很好。有几种方法可以做到这一点，但这种方法是可行的。

您可以在 MyBaseSerice.onStartCommand() 中注册 BroadcastReceiver 并在 MyBaseService.onDestroy() 中取消注册。

您将需要确定如何关闭 MyBaseService。 Activity 可以做到，或者 MyBaseService 需要跟踪它正在等待 IntentService 的回复数量，一旦它得到最后一个回复，它就可以自行关闭通过调用 stopSelf().

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