采用Callable的Xamarin Executor(Xamarin Executor that takes Callable)

 第一部分 
 
 嗨，我正在尝试更改以下代码以使用Callable而不是Runnable，因为我希望提供给Executor的函数返回数据。 
 
using Android.App;
using Android.OS;
using Android.Widget;
using Java.Util.Concurrent;
using Java.Lang;

namespace ServiceExecutor {
    [Activity(Label = "SomeActivity")]
    public class SomeActivity : Activity {
        TextView tv1;

        Runnable r;            
        static IExecutorService exe = Executors.NewSingleThreadExecutor();        

        protected override void OnCreate(Bundle savedInstanceState) {
            base.OnCreate(savedInstanceState);

            tv1 = FindViewById<TextView>(Resource.Id.textView1);

            for (int i = 0; i < 4; i++) {
                r = new Runnable(() => function(i));
                exe.Submit(r);
            }
        }

        public void function(int i) {
            RunOnUiThread(() => tv1.Text += "function " + i.ToString() + "\r\n");
            Thread.Sleep(2000);
        }    
    }
}
 
 我在Java中找到了一些例子，但是当我试图在C＃中复制代码时，缺少主类Callable，并且只有ICallable，我无法实例化。 不幸的是，Xamarin文档也提供了Java示例！ 
 
 如果有人能帮忙，我将不胜感激！ 
 
 第二部分 
 
 完整的设计理念是一个Service，它有这个嵌入式Executor来顺序运行任务。 顺序执行是非常重要的，因为该服务将与蓝牙接口具有连续的套接字连接，并且一次只能处理一个蓝牙请求（任务）。 最初我想使用IntentService，但我希望服务在应用程序的整个生命周期中都是活动的，否则对于每个蓝牙请求，套接字必须重新连接。 
 
 任何有关设计方法的建议也将受到赞赏！ 

Part I
 
Hi, I am trying to alter the following piece of code to take Callable instead of Runnable, because I want the functions that are fed to the Executor to return data.
 
using Android.App;
using Android.OS;
using Android.Widget;
using Java.Util.Concurrent;
using Java.Lang;

namespace ServiceExecutor {
    [Activity(Label = "SomeActivity")]
    public class SomeActivity : Activity {
        TextView tv1;

        Runnable r;            
        static IExecutorService exe = Executors.NewSingleThreadExecutor();        

        protected override void OnCreate(Bundle savedInstanceState) {
            base.OnCreate(savedInstanceState);

            tv1 = FindViewById<TextView>(Resource.Id.textView1);

            for (int i = 0; i < 4; i++) {
                r = new Runnable(() => function(i));
                exe.Submit(r);
            }
        }

        public void function(int i) {
            RunOnUiThread(() => tv1.Text += "function " + i.ToString() + "\r\n");
            Thread.Sleep(2000);
        }    
    }
}
 
I have found examples in Java but when I'm trying to replicate the code in C# the main class Callable is missing and there is only ICallable which I can't instantiate. Unfortunately the Xamarin documentation also gives Java examples!
 
I would appreciate if anyone could help!
 
Part II
 
The complete design idea is a Service the has this embedded Executor to run tasks sequentially. The sequential execution is cruicial because the service will have continuous socket connection with the bluetooth interface and only one bluetooth request (task) can be handled at a time. Initially I wanted to use IntentService but I want the service to be alive throughout the life of the application, otherwise for each bluetooth request the socket will have to reconnect. 
 
Any advice for the design approach will also be appreciated!

原文：https://stackoverflow.com/questions/41737154