将纯文本从Android库发送到Android项目 [英] Send plain text from an Android library to an Android project

问题描述

我正在尝试从库中向项目android发送一些文本.它们是连接在一起的，我可以从项目中启动意图，但是我不了解如何将数据从库发送到主项目.我的问题:有可能吗?

I am trying to send some text from my library to the project android. They are connected, i can start an intent from the project but i dont understand how to send data from library to the main project. My question: is it possible?

谢谢.

推荐答案

您可以借助接口来实现这种通信.
这个想法是创建一个回调方法，该方法将在您的活动中实现，并由项目库调用以将文本发送回给您(在android项目中).

You could achieve this communication with the aid of interfaces.
The idea is to crate a callback method that will be implemented in your activity, and will be called by the project library to send text back to you (in android project).

例如，创建一个接口:

public interface OnTaskFinishedListener(){
   void onTaskFinished(String text);
}

让我们假设您的项目库中有一个名为Task的类，该类具有方法doTask()，您可以在Android项目中使用该类执行某些任务，然后将结果发送回给您.

Let assume that in your project library you have a class named Task with a method doTask() that you use in your Android project to perform some task and then send the result back to you.

然后Task的实现将如下所示:

Then the implementation of Task will look like this:

public class Task{
   // ......

   public void doTask(OnTaskFinishedListener listener){
      // Do the task...

      String textToSend = // some text to send to caller activity
      listener.onTaskFinished(textToSend);
   }
}

现在让您的活动实现OnTaskFinishedListner:

public class MainActivity extends Activity implements OnTaskFinishedListener{

   @Override
   public void onCreate(Bundle savedInstanceState){
       // .........
       Task task = new Task();
       task.doTask(this); //pass the current activity as the listener.
   }

   @Override
   public void onTaskFinished(String result){
      // do what you need to do with "result"
      // the method will be called when "doTask()" will finish its job.
   }
} 

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