在 .net Maui for Android 中创建 IExecutor？

Question

我不确定如何在 .Net Maui 中实现 IExecutor。我需要这个执行器以便能够简单地在 Android 中运行一个函数（它接受 IExecutor 作为参数）。我真的不知道如何实现所有功能，但是这个对象必须实现 IExecutor...

#if ANDROID
using Java.Interop;
using Java.Lang;
using Java.Util.Concurrent;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CellularSignal1
{
    public class Executor : Java.Lang.Object, IExecutor
    {
        public nint Handle => throw new NotImplementedException();

        public int JniIdentityHashCode => throw new NotImplementedException();

        public JniObjectReference PeerReference => new JniObjectReference();

        public JniPeerMembers JniPeerMembers => throw new NotImplementedException();

        public JniManagedPeerStates JniManagedPeerState => throw new NotImplementedException();

        public void Dispose()
        {
            throw new NotImplementedException();
        }

        public void Disposed()
        {
            throw new NotImplementedException();
        }

        public void DisposeUnlessReferenced()
        {
            throw new NotImplementedException();
        }

        public void Execute(IRunnable command)
        {
            command.Run();
        }

        public void Finalized()
        {
            throw new NotImplementedException();
        }

        public void SetJniIdentityHashCode(int value)
        {
            throw new NotImplementedException();
        }

        public void SetJniManagedPeerState(JniManagedPeerStates value)
        {
            throw new NotImplementedException();
        }

        public void SetPeerReference(JniObjectReference reference)
        {
            throw new NotImplementedException();
        }

        public void UnregisterFromRuntime()
        {
            throw new NotImplementedException();
        }
    }
}
#endif

我尝试按原样离开，但开始从中得到一堆“未实现”的异常

Answer 1

只需使用您的上下文（Android.Content.Context）“Executor”或“MainExecutor”即可。
例如，您可以从 MainActivity 中获取主执行器，如下所示

public class MainActivity : ... 
{
    public IExecutor GetExecutor() { return this.MainExecutor; }
}

顺便说一句，您不必重新实现 Java.Lang.Object 的属性。

Answer 2

有多种方法可以获取它。

API >= 28.0

Platform.CurrentActivity.MainExecutor 

或

Platform.AppContext.MainExecutor

还有api < 28.0

ContextCompat.GetMainExecutor(Platform.AppContext)