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Bugzilla40955.cs
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Bugzilla40955.cs
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using System;
using System.Collections.Generic;
using System.Diagnostics;
using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;
#if UITEST
using Xamarin.Forms.Core.UITests;
using Xamarin.UITest;
using NUnit.Framework;
#endif
namespace Xamarin.Forms.Controls.Issues
{
[Preserve(AllMembers = true)]
[Issue(IssueTracker.Bugzilla, 40955, "Memory leak with FormsAppCompatActivity and NavigationPage", PlatformAffected.Android)]
#if UITEST
[Category(UITestCategories.Performance)]
[NUnit.Framework.Category(Core.UITests.UITestCategories.Bugzilla)]
#endif
public class Bugzilla40955 : TestMasterDetailPage
{
const string DestructorMessage = "NavigationPageEx Destructor called";
const string Page1Title = "Page1";
const string Page2Title = "Page2";
const string Page3Title = "Page3";
const string LabelPage1 = "Open the drawer menu and select Page2";
const string LabelPage2 = "Open the drawer menu and select Page3";
static string LabelPage3 = $"The console should have displayed the text '{DestructorMessage}' at least once. If not, this test has failed.";
static string Success = string.Empty;
static MasterDetailPage Reference;
protected override void Init()
{
var masterPage = new MasterPage();
Master = masterPage;
masterPage.ListView.ItemSelected += (sender, e) =>
{
var item = e.SelectedItem as MasterPageItem;
if (item != null)
{
Detail = new NavigationPageEx((Page)Activator.CreateInstance(item.TargetType));
masterPage.ListView.SelectedItem = null;
IsPresented = false;
}
};
Detail = new NavigationPageEx(new _409555_Page1());
Reference = this;
}
[Preserve(AllMembers = true)]
public class MasterPageItem
{
public string IconSource { get; set; }
public Type TargetType { get; set; }
public string Title { get; set; }
}
[Preserve(AllMembers = true)]
public class MasterPage : ContentPage
{
public MasterPage()
{
Title = "Menu";
ListView = new ListView { VerticalOptions = LayoutOptions.FillAndExpand, SeparatorVisibility = SeparatorVisibility.None };
ListView.ItemTemplate = new DataTemplate(() =>
{
var ic = new ImageCell();
ic.SetBinding(TextCell.TextProperty, "Title");
return ic;
});
Content = new StackLayout
{
Children = { ListView }
};
var masterPageItems = new List<MasterPageItem>();
masterPageItems.Add(new MasterPageItem
{
Title = Page1Title,
TargetType = typeof(_409555_Page1)
});
masterPageItems.Add(new MasterPageItem
{
Title = Page2Title,
TargetType = typeof(_409555_Page2)
});
masterPageItems.Add(new MasterPageItem
{
Title = Page3Title,
TargetType = typeof(_409555_Page3)
});
ListView.ItemsSource = masterPageItems;
}
public ListView ListView { get; }
}
[Preserve(AllMembers = true)]
public class NavigationPageEx : NavigationPage
{
public NavigationPageEx(Page root) : base(root)
{
}
~NavigationPageEx()
{
Debug.WriteLine(DestructorMessage);
Success = DestructorMessage;
}
}
[Preserve(AllMembers = true)]
public class _409555_Page1 : ContentPage
{
public _409555_Page1()
{
Title = Page1Title;
var lbl = new Label
{
Text = LabelPage1
};
lbl.GestureRecognizers.Add(new TapGestureRecognizer
{
Command = new Command(OpenMaster)
});
Content = new StackLayout
{
Children = { lbl }
};
}
}
static void OpenMaster()
{
Reference.IsPresented = true;
}
[Preserve(AllMembers = true)]
public class _409555_Page2 : ContentPage
{
public _409555_Page2()
{
Title = Page2Title;
var lbl = new Label
{
Text = LabelPage2
};
lbl.GestureRecognizers.Add(new TapGestureRecognizer
{
Command = new Command(OpenMaster)
});
Content = new StackLayout { Children = { lbl } };
}
}
[Preserve(AllMembers = true)]
public class _409555_Page3 : ContentPage
{
public _409555_Page3()
{
Title = Page3Title;
var lbl = new Label
{
Text = LabelPage3
};
lbl.GestureRecognizers.Add(new TapGestureRecognizer
{
Command = new Command(async () => await DisplayAlert("Alert", Success, "Ok"))
});
var successLabel = new Label();
Content = new StackLayout
{
Children =
{
lbl
}
};
}
protected override void OnAppearing()
{
base.OnAppearing();
GarbageCollectionHelper.Collect();
}
}
#if UITEST && __ANDROID__
[Test]
public void MemoryLeakInFormsAppCompatActivity()
{
RunningApp.WaitForElement(Page1Title);
RunningApp.Tap(LabelPage1);
RunningApp.WaitForElement(Page1Title);
RunningApp.Tap(Page2Title);
RunningApp.WaitForElement(LabelPage2);
RunningApp.Tap(LabelPage2);
RunningApp.WaitForElement(Page2Title);
RunningApp.Tap(Page3Title);
RunningApp.WaitForElement(LabelPage3);
RunningApp.Tap(LabelPage3);
RunningApp.WaitForElement(Success);
}
#endif
}
}