[Android] Double tapping on context action should not crash (#609)

* fix double tap nre

* added sample code

* new fix

* added comment

* better fix

* edit position of change

* changes

2 files changed, 67 insertions, 0 deletions

diff --git a/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla45027.cs b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla45027.cs
new file mode 100644
index 00000000..260967be
--- /dev/null
+++ b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla45027.cs
@@ -0,0 +1,66 @@
+using System.Collections.Generic;
+using Xamarin.Forms.CustomAttributes;
+using Xamarin.Forms.Internals;
+
+#if UITEST
+using Xamarin.UITest;
+using NUnit.Framework;
+#endif
+
+namespace Xamarin.Forms.Controls.Issues
+{
+	[Preserve(AllMembers = true)]
+	[Issue(IssueTracker.Bugzilla, 45027, "App crashes when double tapping on ToolbarItem or MenuItem very quickly", PlatformAffected.Android)]
+	public class Bugzilla45027 : TestContentPage // or TestMasterDetailPage, etc ...
+	{
+		protected override void Init()
+		{
+			var list = new List<int>();
+			for (var i = 0; i < 10; i++)
+				list.Add(i);
+
+			var stackLayout = new StackLayout
+			{
+				Orientation = StackOrientation.Vertical,
+				Children =
+				{
+					new Label
+					{
+						Text = "Long tap list items to display context menu. Double tapping each action rapidly should not crash.",
+						HorizontalTextAlignment = TextAlignment.Center
+					}
+				}
+			};
+
+			var listView = new ListView
+			{
+				ItemsSource = list,
+				ItemTemplate = new DataTemplate(() =>
+				{
+					var label = new Label();
+					label.SetBinding(Label.TextProperty, new Binding("."));
+
+					return new ViewCell
+					{
+						View = new ContentView
+						{
+							Content = label,
+						},
+						ContextActions = { new MenuItem
+						{
+							Text = "Action"
+						},
+						new MenuItem
+						{
+							Text = "Delete",
+							IsDestructive = true
+						} }
+					};
+				})
+			};
+			stackLayout.Children.Add(listView);
+
+			Content = stackLayout;
+		}
+	}
+}
\ No newline at end of file
diff --git a/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Xamarin.Forms.Controls.Issues.Shared.projitems b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Xamarin.Forms.Controls.Issues.Shared.projitems
index 742c29a7..c69e1a31 100644
--- a/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Xamarin.Forms.Controls.Issues.Shared.projitems
+++ b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Xamarin.Forms.Controls.Issues.Shared.projitems
@@ -157,6 +157,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla42832.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla44044.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla44338.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Bugzilla45027.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla45330.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla45743.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Bugzilla46494.cs" />