通过接口将数据从活动传递到服务 [英] Passing data from activity to service through interface

问题描述

我正在尝试将数据从Android活动传递到服务。我试图通过调用包含接口的另一个类中的方法来实现，该接口由服务实现。

I am trying to pass data from an Android Activity to a Service. I am attempting to do so by calling a method within another class which contains an interface,this interface is implemented by the Service.

MQTTNotifier（Activity）>> MQTTServiceDelegate（Middle男人，有接口）>> MQTTService（Implements Interface）

MQTTNotifier(Activity) >> MQTTServiceDelegate(Middle Man, Has Interface) >> MQTTService (Implements Interface)

这可能吗？我似乎无法获得比MQTTServiceDelegate subscribeToTopic（）方法更多的String主题，我现在想将它转发给服务。

MQTTNotifier活动

这是我对MQTTServiceDelegate中的方法进行的调用，我传给它一个String topicName。

Here is the call I am making to a method inside MQTTServiceDelegate, and I am passing it a String topicName.

MQTTServiceDelegate.subscribeToTopic(topicName);

MQTTServiceDelegate（中间人）

这是接口

public interface SubscribeHandler {
    public void handleSubscribe(String topic);
}

这里我试图获取String主题，并将其传递给界面，我希望服务接收并做一些事情。

Here I am attempting to take the String topic, and pass it to the interface, which I would like the Service to receive and do something with.

  public static void subscribeToTopic(String topic) {
  SubscribeHandler subscribeHandler = new SubscribeHandler() {

    @Override
    public void handleSubscribe(String topic) {
      // TODO Auto-generated method stub

      // WHAT DO I DO HERE?


    }
  }; 
}

MQTTService

这是服务中的接口方法实现

This is the interface method implementation inside the Service

  @Override
  public void handleSubscribe(String topic) {
    // TODO Auto-generated method stub
    if (isOnline()) {

      if (connectToBroker()) {

        Log.e("SUBSCRIBE TO ANOTHER TOPIC", "SUBSCRIBE TO ANOTHER TOPIC");
        subscribeToTopic(topic);
      }
    }

  }

推荐答案

通过接口将数据从活动传递到服务

Passing data from activity to service through interface

用于从中获取数据使用我们在Service中获取接口对象的接口的服务活动，我们正在Service中实现。

For getting data from Activity to service using interface we need to get interface object in Actvity which we are implementing in Service.

例如，仅用于测试：

1。创建静态参考服务：

public static SubscribeHandler subscribeHandler;

2。在 onStartCommand（）服务方法将此分配给subscribeHandler：

2. In onStartCommand() method of Service assign this to subscribeHandler:

subscribeHandler=this;

现在，在Activity中启动服务访问 subscribeHandler 来自发送数据的服务：

Now after starting Service access subscribeHandler in Activity from Service for sending data:

subscribeHandler.handleSubscribe("Message");

但不是很好的方法使用静态对象在应用程序组件之间发送数据

But not good approach use static objects for sending data between to components of application

因此，对于服务和活动之间的通信，使用 LocalBroadcastManager

So for communicating between Service and Activity use LocalBroadcastManager

如何使用LocalBroadcastManager？

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