add Android version

Pixiview.Android/Effects/LongPressEffectImplement.cs

@@ -0,0 +1,49 @@
+using Pixiview.Droid.Effects;
+using Pixiview.Utils;
+using Xamarin.Forms;
+using Xamarin.Forms.Platform.Android;
+using static Android.Views.View;
+
+[assembly: ResolutionGroupName("Pixiview")]
+[assembly: ExportEffect(typeof(LongPressEffectImplement), "LongPressEffect")]
+namespace Pixiview.Droid.Effects
+{
+    public class LongPressEffectImplement : PlatformEffect
+    {
+        private bool attached;
+
+        protected override void OnAttached()
+        {
+            if (!attached)
+            {
+                attached = true;
+                Control.LongClick += Container_LongClick;
+            }
+        }
+
+        protected override void OnDetached()
+        {
+            if (attached)
+            {
+                attached = false;
+                Control.LongClick -= Container_LongClick;
+            }
+        }
+
+        private void Container_LongClick(object sender, LongClickEventArgs e)
+        {
+            var element = Element;
+            if (element != null)
+            {
+                var command = LongPressEffect.GetCommand(element);
+                if (command != null)
+                {
+                    e.Handled = true;
+
+                    var o = LongPressEffect.GetCommandParameter(element);
+                    command.Execute(o);
+                }
+            }
+        }
+    }
+}