[Android] Fix CollectionView EmptyView not displayed correctly by KarthikRajaKalaimani · Pull Request #34956 · dotnet/maui

KarthikRajaKalaimani · 2026-04-14T11:43:28Z

Note

Are you waiting for the changes in this PR to be merged?
It would be very helpful if you could test the resulting artifacts from this PR and let us know in a comment if this change resolves your issue. Thank you!

Issue Details:

When a CollectionView with a GridItemsLayout (span > 1) has both a Header and an EmptyView, the EmptyView appeared beside the Header instead of below it.

Root Cause:

The root cause is in GridLayoutSpanSizeLookup.GetSpanSize(), which determines how many grid columns each item should occupy. Normally it checks ItemViewType constants (like Header = 43, Footer = 44) to give those items full-width span. However, when the collection is empty, Android uses an EmptyViewAdapter that assigns its items private incrementing IDs (1, 2, 3…) which never match those constants — so everything falls through to return 1, giving each item only a single column.

Description of Change:

The fix adds a simple early check: if the current adapter is an EmptyViewAdapter, immediately return the full _gridItemsLayout.Span for every position, skipping the view-type matching entirely. This ensures that when
the collection is empty, all items (header, empty view, footer) always span the full grid width and stack vertically as expected.

Tested the behavior in the following platforms:

Android
Windows
iOS
Mac

Reference:

N/A

Issues Fixed:

Fixes #34861

Screenshots

Before	After

github-actions · 2026-04-14T11:43:37Z

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/dotnet/maui/main/eng/scripts/get-maui-pr.sh | bash -s -- 34956

Or

Run remotely in PowerShell:

iex "& { $(irm https://raw.githubusercontent.com/dotnet/maui/main/eng/scripts/get-maui-pr.ps1) } 34956"

dotnet-policy-service · 2026-04-14T11:43:49Z

Hey there @@KarthikRajaKalaimani! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

Copilot

Pull request overview

Fixes an Android CollectionView/GridItemsLayout edge case where, when the list is empty and an EmptyView + Header are set, the EmptyView could be laid out beside the header instead of below it due to EmptyViewAdapter view-type handling.

Changes:

Android: Update GridLayoutSpanSizeLookup.GetSpanSize() to treat EmptyViewAdapter items as full-span.
Tests: Add a new HostApp repro page for Issue 34861 (header + empty view + span=2).
Tests: Add an Appium/NUnit UI test validating the EmptyView renders below the header (Android-only execution).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/Controls/src/Core/Handlers/Items/Android/GridLayoutSpanSizeLookup.cs	Ensures `EmptyViewAdapter` items always occupy the full grid span to prevent side-by-side header/empty layout.
src/Controls/tests/TestCases.HostApp/Issues/Issue34861.cs	Adds a minimal repro page for the scenario (Grid span > 1 with Header + EmptyView and no items).
src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue34861.cs	Adds an Appium UI test that asserts EmptyView is positioned below the header (Android-only).

Copilot · 2026-04-14T12:36:09Z

@@ -0,0 +1,34 @@
+#if TEST_FAILS_ON_IOS && TEST_FAILS_ON_WINDOWS && TEST_FAILS_ON_CATALYST // Test fails on iOS, Windows and Catalyst because of Header is not visible https://github.com/dotnet/maui/issues/34897


The preprocessor guard here is effectively being used to make this test run only on Android. That intent would be clearer and less coupled to the test-runner projects’ custom TEST_FAILS_ON_* constants if it used the standard #if ANDROID platform symbol instead (and kept the note about excluding iOS/Windows/MacCatalyst in a comment or via runtime Assert.Ignore where appropriate).

Suggested change

#if TEST_FAILS_ON_IOS && TEST_FAILS_ON_WINDOWS && TEST_FAILS_ON_CATALYST // Test fails on iOS, Windows and Catalyst because of Header is not visible https://github.com/dotnet/maui/issues/34897

#if ANDROID // Test fails on iOS, Windows and Catalyst because of Header is not visible https://github.com/dotnet/maui/issues/34897

MauiBot · 2026-04-15T11:08:32Z

🚦 Gate — Test Before and After Fix

👋 @KarthikRajaKalaimani — new gate results are available. Please review the latest session below.

🚦 Gate Session — 9e3f22c · Commemt added · 2026-04-15 11:08 UTC

Gate Result: ⚠️ ENV ERROR

Platform: ANDROID · Base: main · Merge base: b43bdad1

Test	Without Fix (expect FAIL)	With Fix (expect PASS)
🖥️ Issue34861 `Issue34861`	✅ FAIL — 901s	⚠️ ENV ERROR

🔴 Without fix — 🖥️ Issue34861: FAIL ✅ · 901s

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Build succeeded.
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Time Elapsed 00:08:28.08
Broadcasting: Intent { act=android.intent.action.CLOSE_SYSTEM_DIALOGS flg=0x400000 }
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Test run for /home/vsts/work/1/s/artifacts/bin/Controls.TestCases.Android.Tests/Debug/net10.0/Controls.TestCases.Android.Tests.dll (.NETCoreApp,Version=v10.0)
VSTest version 18.0.1 (x64)

Starting test execution, please wait...
A total of 1 test files matched the specified pattern.
/home/vsts/work/1/s/artifacts/bin/Controls.TestCases.Android.Tests/Debug/net10.0/Controls.TestCases.Android.Tests.dll
[xUnit.net 00:00:00.00] xUnit.net VSTest Adapter v2.8.2+699d445a1a (64-bit .NET 10.0.0)
[xUnit.net 00:00:00.22]   Discovering: Controls.TestCases.Android.Tests
[xUnit.net 00:00:00.83]   Discovered:  Controls.TestCases.Android.Tests
NUnit Adapter 4.5.0.0: Test execution started
Running selected tests in /home/vsts/work/1/s/artifacts/bin/Controls.TestCases.Android.Tests/Debug/net10.0/Controls.TestCases.Android.Tests.dll
   NUnit3TestExecutor discovered 1 of 1 NUnit test cases using Current Discovery mode, Non-Explicit run
>>>>> 04/15/2026 10:42:11 FixtureSetup for Issue34861(Android)
>>>>> 04/15/2026 10:42:14 EmptyViewShouldAppearBelowHeaderInGridLayout Start
>>>>> 04/15/2026 10:43:20 EmptyViewShouldAppearBelowHeaderInGridLayout Stop
>>>>> 04/15/2026 10:43:25 Log types: logcat, bugreport, server
>>>>> 04/15/2026 10:43:40 SaveUIDiagnosticInfo timed out — app may be unresponsive, skipping UI diagnostics
  Failed EmptyViewShouldAppearBelowHeaderInGridLayout [1 m 25 s]
  Error Message:
     EmptyView should appear below the Header, not beside it
Assert.That(emptyViewRect.Y, Is.GreaterThanOrEqualTo(headerRect.Y + headerRect.Height))
  Expected: greater than or equal to 334
  But was:  209

  Stack Trace:
     at Microsoft.Maui.TestCases.Tests.Issues.Issue34861.EmptyViewShouldAppearBelowHeaderInGridLayout() in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue34861.cs:line 26

1)    at Microsoft.Maui.TestCases.Tests.Issues.Issue34861.EmptyViewShouldAppearBelowHeaderInGridLayout() in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue34861.cs:line 26


  Standard Error Messages:
 >>>>> 04/15/2026 10:43:40 SaveUIDiagnosticInfo timed out — app may be unresponsive, skipping UI diagnostics

NUnit Adapter 4.5.0.0: Test execution complete

Total tests: 1
     Failed: 1
Test Run Failed.
 Total time: 3.2789 Minutes

🟢 With fix — 🖥️ Issue34861: ⚠️ ENV ERROR · 1466s

(truncated to last 15,000 chars)

ns.PushAndInstallPackageAsync(AndroidDevice device, PushAndInstallCommand command, CancellationToken token) [/home/vsts/work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]
/home/vsts/work/1/s/.dotnet/packs/Microsoft.Android.Sdk.Linux/36.1.2/tools/Xamarin.Android.Common.Debugging.targets(333,5): error ADB0010:    at AndroidDeviceExtensions.PushAndInstallPackageAsync(AndroidDevice device, PushAndInstallCommand command, CancellationToken token) [/home/vsts/work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]
/home/vsts/work/1/s/.dotnet/packs/Microsoft.Android.Sdk.Linux/36.1.2/tools/Xamarin.Android.Common.Debugging.targets(333,5): error ADB0010:    at Xamarin.Android.Tasks.FastDeploy.InstallPackage(Boolean installed) [/home/vsts/work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]
/home/vsts/work/1/s/.dotnet/packs/Microsoft.Android.Sdk.Linux/36.1.2/tools/Xamarin.Android.Common.Debugging.targets(333,5): error ADB0010:    at Xamarin.Android.Tasks.FastDeploy.InstallPackage(Boolean installed) [/home/vsts/work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]
/home/vsts/work/1/s/.dotnet/packs/Microsoft.Android.Sdk.Linux/36.1.2/tools/Xamarin.Android.Common.Debugging.targets(333,5): error ADB0010:    at Xamarin.Android.Tasks.FastDeploy.RunInstall() [/home/vsts/work/1/s/src/Controls/tests/TestCases.HostApp/Controls.TestCases.HostApp.csproj::TargetFramework=net10.0-android]
    0 Warning(s)
    1 Error(s)

Time Elapsed 00:11:23.69
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  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13842627
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13842627
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  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13842627
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  Controls.Xaml -> /home/vsts/work/1/s/artifacts/bin/Controls.TestCases.HostApp/Debug/net10.0-android/Microsoft.Maui.Controls.Xaml.dll

Build succeeded.
    0 Warning(s)
    0 Error(s)

Time Elapsed 00:09:35.98
Broadcasting: Intent { act=android.intent.action.CLOSE_SYSTEM_DIALOGS flg=0x400000 }
Broadcast completed: result=0
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  Determining projects to restore...
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  Essentials -> /home/vsts/work/1/s/artifacts/bin/Essentials/Debug/net10.0/Microsoft.Maui.Essentials.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13842627
  Core -> /home/vsts/work/1/s/artifacts/bin/Core/Debug/net10.0/Microsoft.Maui.dll
  Controls.BindingSourceGen -> /home/vsts/work/1/s/artifacts/bin/Controls.BindingSourceGen/Debug/netstandard2.0/Microsoft.Maui.Controls.BindingSourceGen.dll
  ##vso[build.updatebuildnumber]10.0.60-ci+azdo.13842627
  Controls.Core -> /home/vsts/work/1/s/artifacts/bin/Controls.Core/Debug/net10.0/Microsoft.Maui.Controls.dll
  UITest.Core -> /home/vsts/work/1/s/artifacts/bin/UITest.Core/Debug/net10.0/UITest.Core.dll
  VisualTestUtils -> /home/vsts/work/1/s/artifacts/bin/VisualTestUtils/Debug/netstandard2.0/VisualTestUtils.dll
  UITest.NUnit -> /home/vsts/work/1/s/artifacts/bin/UITest.NUnit/Debug/net10.0/UITest.NUnit.dll
  VisualTestUtils.MagickNet -> /home/vsts/work/1/s/artifacts/bin/VisualTestUtils.MagickNet/Debug/netstandard2.0/VisualTestUtils.MagickNet.dll
  UITest.Appium -> /home/vsts/work/1/s/artifacts/bin/UITest.Appium/Debug/net10.0/UITest.Appium.dll
  UITest.Analyzers -> /home/vsts/work/1/s/artifacts/bin/UITest.Analyzers/Debug/netstandard2.0/UITest.Analyzers.dll
  Controls.TestCases.Android.Tests -> /home/vsts/work/1/s/artifacts/bin/Controls.TestCases.Android.Tests/Debug/net10.0/Controls.TestCases.Android.Tests.dll
Test run for /home/vsts/work/1/s/artifacts/bin/Controls.TestCases.Android.Tests/Debug/net10.0/Controls.TestCases.Android.Tests.dll (.NETCoreApp,Version=v10.0)
VSTest version 18.0.1 (x64)

Starting test execution, please wait...
A total of 1 test files matched the specified pattern.
/home/vsts/work/1/s/artifacts/bin/Controls.TestCases.Android.Tests/Debug/net10.0/Controls.TestCases.Android.Tests.dll
[xUnit.net 00:00:00.00] xUnit.net VSTest Adapter v2.8.2+699d445a1a (64-bit .NET 10.0.0)
[xUnit.net 00:00:00.12]   Discovering: Controls.TestCases.Android.Tests
[xUnit.net 00:00:00.31]   Discovered:  Controls.TestCases.Android.Tests
NUnit Adapter 4.5.0.0: Test execution started
Running selected tests in /home/vsts/work/1/s/artifacts/bin/Controls.TestCases.Android.Tests/Debug/net10.0/Controls.TestCases.Android.Tests.dll
   NUnit3TestExecutor discovered 1 of 1 NUnit test cases using Current Discovery mode, Non-Explicit run
>>>>> 04/15/2026 11:07:15 FixtureSetup for Issue34861(Android)
>>>>> 04/15/2026 11:07:30 The FixtureSetup threw an exception. Attempt 0/1.
Exception details: System.TimeoutException: [Android] CollectionView EmptyView not displayed correctly with GridItemsLayout span > 1
   at UITest.Appium.HelperExtensions.Wait(Func`1 query, Func`2 satisfactory, String timeoutMessage, Nullable`1 timeout, Nullable`1 retryFrequency) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 2757
   at UITest.Appium.HelperExtensions.WaitForAtLeastOne(Func`1 query, String timeoutMessage, Nullable`1 timeout, Nullable`1 retryFrequency) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 2784
   at UITest.Appium.HelperExtensions.WaitForElement(IApp app, String marked, String timeoutMessage, Nullable`1 timeout, Nullable`1 retryFrequency, Nullable`1 postTimeout) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 793
   at Microsoft.Maui.TestCases.Tests._IssuesUITest.NavigateToIssue(String issue) in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/_IssuesUITest.cs:line 54
   at Microsoft.Maui.TestCases.Tests._IssuesUITest.TryToResetTestState() in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/_IssuesUITest.cs:line 25
   at Microsoft.Maui.TestCases.Tests.UITest.FixtureSetup() in /_/src/Controls/tests/TestCases.Shared.Tests/UITest.cs:line 576
>>>>> 04/15/2026 11:07:33 FixtureSetup for Issue34861(Android)
>>>>> 04/15/2026 11:07:49 The FixtureSetup threw an exception. Attempt 1/1.
Exception details: System.TimeoutException: [Android] CollectionView EmptyView not displayed correctly with GridItemsLayout span > 1
   at UITest.Appium.HelperExtensions.Wait(Func`1 query, Func`2 satisfactory, String timeoutMessage, Nullable`1 timeout, Nullable`1 retryFrequency) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 2757
   at UITest.Appium.HelperExtensions.WaitForAtLeastOne(Func`1 query, String timeoutMessage, Nullable`1 timeout, Nullable`1 retryFrequency) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 2784
   at UITest.Appium.HelperExtensions.WaitForElement(IApp app, String marked, String timeoutMessage, Nullable`1 timeout, Nullable`1 retryFrequency, Nullable`1 postTimeout) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 793
   at Microsoft.Maui.TestCases.Tests._IssuesUITest.NavigateToIssue(String issue) in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/_IssuesUITest.cs:line 54
   at Microsoft.Maui.TestCases.Tests._IssuesUITest.TryToResetTestState() in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/_IssuesUITest.cs:line 25
   at Microsoft.Maui.TestCases.Tests.UITest.FixtureSetup() in /_/src/Controls/tests/TestCases.Shared.Tests/UITest.cs:line 576
>>>>> 04/15/2026 11:07:49 Log types: logcat, bugreport, server
>>>>> 04/15/2026 11:07:49 Log types: logcat, bugreport, server
  Failed EmptyViewShouldAppearBelowHeaderInGridLayout [45 s]
  Error Message:
   OneTimeSetUp: System.TimeoutException : [Android] CollectionView EmptyView not displayed correctly with GridItemsLayout span > 1
  Stack Trace:
     at UITest.Appium.HelperExtensions.Wait(Func`1 query, Func`2 satisfactory, String timeoutMessage, Nullable`1 timeout, Nullable`1 retryFrequency) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 2757
   at UITest.Appium.HelperExtensions.WaitForAtLeastOne(Func`1 query, String timeoutMessage, Nullable`1 timeout, Nullable`1 retryFrequency) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 2784
   at UITest.Appium.HelperExtensions.WaitForElement(IApp app, String marked, String timeoutMessage, Nullable`1 timeout, Nullable`1 retryFrequency, Nullable`1 postTimeout) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 793
   at Microsoft.Maui.TestCases.Tests._IssuesUITest.NavigateToIssue(String issue) in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/_IssuesUITest.cs:line 54
   at Microsoft.Maui.TestCases.Tests._IssuesUITest.TryToResetTestState() in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/_IssuesUITest.cs:line 25
   at Microsoft.Maui.TestCases.Tests.UITest.FixtureSetup() in /_/src/Controls/tests/TestCases.Shared.Tests/UITest.cs:line 576
   at UITest.Appium.NUnit.UITestBase.OneTimeSetup() in /_/src/TestUtils/src/UITest.NUnit/UITestBase.cs:line 221
   at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args)
   at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)

Setup failed for test fixture Microsoft.Maui.TestCases.Tests.Issues.Issue34861(Android)
System.TimeoutException : [Android] CollectionView EmptyView not displayed correctly with GridItemsLayout span > 1
StackTrace:    at UITest.Appium.HelperExtensions.Wait(Func`1 query, Func`2 satisfactory, String timeoutMessage, Nullable`1 timeout, Nullable`1 retryFrequency) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 2757
   at UITest.Appium.HelperExtensions.WaitForAtLeastOne(Func`1 query, String timeoutMessage, Nullable`1 timeout, Nullable`1 retryFrequency) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 2784
   at UITest.Appium.HelperExtensions.WaitForElement(IApp app, String marked, String timeoutMessage, Nullable`1 timeout, Nullable`1 retryFrequency, Nullable`1 postTimeout) in /_/src/TestUtils/src/UITest.Appium/HelperExtensions.cs:line 793
   at Microsoft.Maui.TestCases.Tests._IssuesUITest.NavigateToIssue(String issue) in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/_IssuesUITest.cs:line 54
   at Microsoft.Maui.TestCases.Tests._IssuesUITest.TryToResetTestState() in /_/src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/_IssuesUITest.cs:line 25
   at Microsoft.Maui.TestCases.Tests.UITest.FixtureSetup() in /_/src/Controls/tests/TestCases.Shared.Tests/UITest.cs:line 576
   at UITest.Appium.NUnit.UITestBase.OneTimeSetup() in /_/src/TestUtils/src/UITest.NUnit/UITestBase.cs:line 221
   at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args)
   at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)
NUnit Adapter 4.5.0.0: Test execution complete

Test Run Failed.
Total tests: 1
     Failed: 1
 Total time: 56.8283 Seconds

⚠️ Issues found

⚠️ Issue34861 with fix: Exception calling "Matches" with "2" argument(s): "Value cannot be null. (Parameter 'input')"

📁 Fix files reverted (2 files)

eng/pipelines/ci-copilot.yml
src/Controls/src/Core/Handlers/Items/Android/GridLayoutSpanSizeLookup.cs

MauiBot · 2026-04-15T12:09:35Z

🤖 AI Summary

👋 @KarthikRajaKalaimani — new AI review results are available. Please review the latest session below.

📊 Review Session — 9e3f22c · Commemt added · 2026-04-15 12:09 UTC

🔍 Pre-Flight — Context & Validation

Issue: #34861 - [Android] CollectionView - EmptyView not displayed correctly
PR: #34956 - [Android] Fix CollectionView EmptyView not displayed correctly
Platforms Affected: Android only
Files Changed: 1 implementation, 2 test

Key Findings

When CollectionView uses GridItemsLayout (span > 1) with both a Header and EmptyView, the EmptyView renders beside the Header instead of below it
Root cause: GridLayoutSpanSizeLookup.GetSpanSize() relies on matching ItemViewType constants (Header=43, Footer=44), but EmptyViewAdapter uses private incrementing IDs starting from 1 — never matching those constants
When items list is empty, Android swaps in EmptyViewAdapter; its view types (1, 2, 3) all fall through to return 1 (single column), causing EmptyView and Header to share one row
PR fix: Add if (adapter is EmptyViewAdapter) return _gridItemsLayout.Span check at the top of GetSpanSize() — returns full span for all items when the collection is empty
Inline review comment (copilot-pull-request-reviewer): The #if TEST_FAILS_ON_IOS && TEST_FAILS_ON_WINDOWS && TEST_FAILS_ON_CATALYST guard is confusing; recommends #if ANDROID instead for clarity
- However: The Android test project defines all three TEST_FAILS_ON_* symbols, so the guard is functionally correct (test compiles only for Android). It's a style concern, not a bug.
Gate result: ⚠️ ENV ERROR — test correctly FAILED without fix (proves test catches the bug), but ENV ERROR occurred when running WITH fix (infrastructure issue, not a code issue)

Fix Candidates

#	Source	Approach	Test Result	Files Changed	Notes
PR	PR #34956	Early-return full span when `adapter is EmptyViewAdapter` in `GetSpanSize()`	⚠️ ENV ERROR (Gate)	`GridLayoutSpanSizeLookup.cs`	Clean, minimal fix at correct location

🔧 Fix — Analysis & Comparison

Fix Candidates

#	Source	Approach	Test Result	Files Changed	Notes
PR	PR #34956	Early-return full span when `adapter is EmptyViewAdapter` in `GetSpanSize()`	⚠️ ENV ERROR (Gate)	`GridLayoutSpanSizeLookup.cs`	Clean, minimal fix at correct location
1	try-fix (claude-opus-4.6)	Inverted logic: whitelist data items (TextItem/TemplatedItem) for span=1, everything else defaults to full span	✅ PASS	`GridLayoutSpanSizeLookup.cs`	More future-proof — doesn't need adapter type check
2	try-fix (claude-sonnet-4.6)	Interface contract: `IFullSpanItems` marker interface on EmptyViewAdapter; span lookup checks `adapter is IFullSpanItems`	✅ PASS	`GridLayoutSpanSizeLookup.cs`, `EmptyViewAdapter.cs`, new `IFullSpanItems.cs`	Decoupled design but adds complexity (new file + interface)
3	try-fix (gpt-5.3-codex)	Semantic view-type bucketing in EmptyViewAdapter (stable low-byte type + versioned high-byte), span lookup normalizes via modulo before full-span checks	✅ PASS	`GridLayoutSpanSizeLookup.cs`, `EmptyViewAdapter.cs`	Overly complex — modulo-based ID scheme adds technical debt
4	try-fix (gpt-5.4)	Make EmptyViewAdapter use static ItemViewType.Header/Footer constants so existing span logic works automatically	✅ PASS	`EmptyViewAdapter.cs`	Latent bug: `_headerViewType += 1` increment on content-update breaks constants after first update

Cross-Pollination

Model	Round	New Ideas?	Details
claude-opus-4.6	2	Yes	Override `OnAttachedToRecyclerView` in EmptyViewAdapter to swap in a full-span SpanSizeLookup on the GridLayoutManager
gpt-5.3-codex	2	Yes	`IGridSpanProvider` interface with `GetSpanSizeForPosition` callback
claude-sonnet-4.6	2	Yes	Fix EmptyViewAdapter to use stable fixed IDs + replace `_viewType += 1` trick with `pool.setMaxRecycledViews`
gpt-5.4	2	Yes	Swap to LinearLayoutManager when empty, restore GridLayoutManager when items return

Exhausted: Yes (all models queried × 2 rounds; ideas are increasingly complex; core fix space fully explored)
Selected Fix: Attempt 1 (inverted whitelist) as strongest independent alternative — but PR's fix is also clean and valid

📋 Report — Final Recommendation

⚠️ Final Recommendation: REQUEST CHANGES

Phase Status

Phase	Status	Notes
Pre-Flight	✅ COMPLETE	Android-only bug, 1 fix file, 2 test files
Gate	❌ FAILED	Without-fix: ✅ FAIL (correct). With-fix: ⚠️ ENV ERROR (infrastructure, not code)
Try-Fix	✅ COMPLETE	4 attempts, 4 passing (3 unique valid alternatives + 1 with latent bug)
Report	✅ COMPLETE

Summary

PR #34956 fixes a real Android bug: CollectionView with GridItemsLayout (span > 1) and both a Header + EmptyView shows the EmptyView beside the Header instead of below it. The root cause is well-identified and the fix is logically correct. The Gate ENV ERROR was an infrastructure issue (not a code problem) — the test correctly failed before the fix was applied.

However, there are two actionable issues with the PR that warrant changes before merge:

Preprocessor guard is confusing — the test file uses #if TEST_FAILS_ON_IOS && TEST_FAILS_ON_WINDOWS && TEST_FAILS_ON_CATALYST which is counterintuitive (using "fails on other platforms" to imply "runs on Android"). A copilot reviewer already flagged this with a suggestion to use #if ANDROID instead. This is the standard pattern and clearer for future maintainers.
Missing newline at end of test file — the test file Issue34861.cs in TestCases.Shared.Tests is missing a trailing newline (diff shows \\ No newline at end of file).

Root Cause

GridLayoutSpanSizeLookup.GetSpanSize() checks static ItemViewType constants (Header=43, Footer=44) to determine full-width span. When the collection is empty, Android uses EmptyViewAdapter which initializes private view type IDs as incrementing integers (1, 2, 3). These IDs never match the static constants, so all positions return span=1 (single column), causing header and empty view to share one grid row.

Fix Quality

PR's fix (if (adapter is EmptyViewAdapter) return _gridItemsLayout.Span):

✅ Correct and minimal — single file, 10 lines added
✅ Properly documented with inline comment explaining the why
⚠️ Couples GridLayoutSpanSizeLookup to a specific concrete adapter class (type-coupling concern)
✅ No behavioral change for non-empty collections

Best alternative found (Attempt 1 — inverted whitelist):

- if (itemViewType == ItemViewType.Header || itemViewType == ItemViewType.Footer
-   || itemViewType == ItemViewType.GroupHeader || itemViewType == ItemViewType.GroupFooter)
- {
-   return _gridItemsLayout.Span;
- }
- return 1;
+ if (itemViewType == ItemViewType.TextItem || itemViewType == ItemViewType.TemplatedItem)
+ {
+   return 1;
+ }
+ return _gridItemsLayout.Span;

✅ Single file, comparable simplicity
✅ More future-proof: structural items automatically get full span without needing to enumerate them
✅ No adapter type-check needed
⚠️ Changes the default behavior for any unknown/future view types (they'd get full span instead of span=1)

The PR's fix is simpler and safer (no behavioral change for unknown types). The inverted whitelist is a valid architectural preference but carries a risk of giving unexpected full span to new view types if ItemViewType is extended.

Required Changes

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue34861.cs line 1:
Apply the copilot reviewer's suggestion:

// Before:
#if TEST_FAILS_ON_IOS && TEST_FAILS_ON_WINDOWS && TEST_FAILS_ON_CATALYST // Test fails on iOS, Windows and Catalyst because of Header is not visible https://github.com/dotnet/maui/issues/34897

// After:
#if ANDROID // Test fails on iOS, Windows and Catalyst because of Header is not visible https://github.com/dotnet/maui/issues/34897

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue34861.cs:
Add missing trailing newline at end of file.

Optional Improvements (Non-Blocking)

Consider the inverted whitelist approach (Attempt 1) as an alternative to the adapter is EmptyViewAdapter check if the team prefers no adapter type coupling in GridLayoutSpanSizeLookup
The PR's fix is acceptable as-is for the implementation file — the two test changes above are the only blockers

Selected Fix: PR's fix — after the two required test file corrections are applied

…t#34956)  > [!NOTE] > Are you waiting for the changes in this PR to be merged? > It would be very helpful if you could [test the resulting artifacts](https://github.com/dotnet/maui/wiki/Testing-PR-Builds) from this PR and let us know in a comment if this change resolves your issue. Thank you! ### Issue Details: When a CollectionView with a GridItemsLayout (span > 1) has both a Header and an EmptyView, the EmptyView appeared beside the Header instead of below it. ### Root Cause: The root cause is in GridLayoutSpanSizeLookup.GetSpanSize(), which determines how many grid columns each item should occupy. Normally it checks ItemViewType constants (like Header = 43, Footer = 44) to give those items full-width span. However, when the collection is empty, Android uses an EmptyViewAdapter that assigns its items private incrementing IDs (1, 2, 3…) which never match those constants — so everything falls through to return 1, giving each item only a single column. ### Description of Change: The fix adds a simple early check: if the current adapter is an EmptyViewAdapter, immediately return the full _gridItemsLayout.Span for every position, skipping the view-type matching entirely. This ensures that when the collection is empty, all items (header, empty view, footer) always span the full grid width and stack vertically as expected. **Tested the behavior in the following platforms:** - [x] Android - [ ] Windows - [ ] iOS - [ ] Mac ### Reference: N/A ### Issues Fixed: Fixes dotnet#34861 ### Screenshots | Before | After | |---------|--------| | <img src="https://github.com/user-attachments/assets/d1cea6d7-157d-4230-a13e-dc06241176db" Width="300" Height="600"> | <img alt="image" src="https://github.com/user-attachments/assets/653580a4-0c9c-4fc8-b0e2-2712261aa823" Width="300" Height="600"> |

> [!NOTE] > Are you waiting for the changes in this PR to be merged? > It would be very helpful if you could [test the resulting artifacts](https://github.com/dotnet/maui/wiki/Testing-PR-Builds) from this PR and let us know in a comment if this change resolves your issue. Thank you! ### Issue Details: When a CollectionView with a GridItemsLayout (span > 1) has both a Header and an EmptyView, the EmptyView appeared beside the Header instead of below it. ### Root Cause: The root cause is in GridLayoutSpanSizeLookup.GetSpanSize(), which determines how many grid columns each item should occupy. Normally it checks ItemViewType constants (like Header = 43, Footer = 44) to give those items full-width span. However, when the collection is empty, Android uses an EmptyViewAdapter that assigns its items private incrementing IDs (1, 2, 3…) which never match those constants — so everything falls through to return 1, giving each item only a single column. ### Description of Change: The fix adds a simple early check: if the current adapter is an EmptyViewAdapter, immediately return the full _gridItemsLayout.Span for every position, skipping the view-type matching entirely. This ensures that when the collection is empty, all items (header, empty view, footer) always span the full grid width and stack vertically as expected. **Tested the behavior in the following platforms:** - [x] Android - [ ] Windows - [ ] iOS - [ ] Mac ### Reference: N/A ### Issues Fixed: Fixes #34861 ### Screenshots | Before | After | |---------|--------| | <img src="https://github.com/user-attachments/assets/d1cea6d7-157d-4230-a13e-dc06241176db" Width="300" Height="600"> | <img alt="image" src="https://github.com/user-attachments/assets/653580a4-0c9c-4fc8-b0e2-2712261aa823" Width="300" Height="600"> |

KarthikRajaKalaimani added 3 commits April 9, 2026 14:39

Test case and fix implemented

ccdc1b4

removed test case to run in iOS,mac and windows

87d0aa5

Commemt added

9e3f22c

dotnet-policy-service Bot added the community ✨ Community Contribution label Apr 14, 2026

dotnet-policy-service Bot added the partner/syncfusion Issues / PR's with Syncfusion collaboration label Apr 14, 2026

sheiksyedm marked this pull request as ready for review April 14, 2026 12:30

Copilot AI review requested due to automatic review settings April 14, 2026 12:30

sheiksyedm added platform/ios area-controls-collectionview CollectionView, CarouselView, IndicatorView labels Apr 14, 2026

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[repo-status] Daily Repo Status - April 15, 2026 🌟 #34966

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MauiBot added s/agent-changes-requested AI agent recommends changes - found a better alternative or issues s/agent-reviewed PR was reviewed by AI agent workflow (full 4-phase review) labels Apr 15, 2026

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Add daily PR review queue workflow with actionability detection #34818

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[PR Review Queue] 2026-04-17 #35004

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kubaflo approved these changes Apr 17, 2026

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kubaflo changed the base branch from main to inflight/current April 17, 2026 09:19

kubaflo merged commit b349339 into dotnet:inflight/current Apr 17, 2026
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[Android] Fix CollectionView EmptyView not displayed correctly#34956

[Android] Fix CollectionView EmptyView not displayed correctly#34956
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KarthikRajaKalaimani:fix-34861

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Gate Result: ⚠️ ENV ERROR

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Key Findings

Fix Candidates

Fix Candidates

Cross-Pollination

⚠️ Final Recommendation: REQUEST CHANGES

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		@@ -0,0 +1,34 @@
		#if TEST_FAILS_ON_IOS && TEST_FAILS_ON_WINDOWS && TEST_FAILS_ON_CATALYST // Test fails on iOS, Windows and Catalyst because of Header is not visible https://github.com/dotnet/maui/issues/34897

	#if TEST_FAILS_ON_IOS && TEST_FAILS_ON_WINDOWS && TEST_FAILS_ON_CATALYST // Test fails on iOS, Windows and Catalyst because of Header is not visible https://github.com/dotnet/maui/issues/34897
	#if ANDROID // Test fails on iOS, Windows and Catalyst because of Header is not visible https://github.com/dotnet/maui/issues/34897

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KarthikRajaKalaimani commented Apr 14, 2026

Issue Details:

Root Cause:

Description of Change:

Reference:

Issues Fixed:

Screenshots

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MauiBot commented Apr 15, 2026

🚦 Gate — Test Before and After Fix

Gate Result: ⚠️ ENV ERROR

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🤖 AI Summary

Key Findings

Fix Candidates

Fix Candidates

Cross-Pollination

⚠️ Final Recommendation: REQUEST CHANGES

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