初始化

CPF.Android/AndroidSynchronizationContext.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using Android.App;
+using Android.Content;
+using Android.OS;
+using Android.Runtime;
+using Android.Views;
+using Android.Widget;
+
+namespace CPF.Android
+{
+    class AndroidSynchronizationContext : SynchronizationContext
+    {
+        private Handler _handler;
+        public AndroidSynchronizationContext()
+        {
+            _handler = new Handler(Application.Context.MainLooper);
+        }
+
+        public override void Post(SendOrPostCallback d, object state)
+        {
+            _handler.Post(() =>
+            {
+                d(state);
+            });
+        }
+
+        public override void Send(SendOrPostCallback d, object state)
+        {
+            if (CPF.Threading.Dispatcher.MainThread.CheckAccess())
+            {
+                d(state);
+            }
+            else
+            {
+                ManualResetEvent manual = new ManualResetEvent(false);
+                _handler.Post(() =>
+                {
+                    d(state);
+                    manual.Set();
+                });
+                manual.WaitOne();
+            }
+        }
+    }
+}