Bug 56272 - [VSfM 15.3] Designer UI throws Null Pointer Exception when API Version 4.0 (v14) is selected.
Summary: [VSfM 15.3] Designer UI throws Null Pointer Exception when API Version 4.0 (v...
Alias: None
Product: Xamarin Studio
Classification: Desktop
Component: Android Designer ()
Version: 7.1 (d15-3)
Hardware: PC Mac OS
: High major
Target Milestone: 15.3
Assignee: Jérémie Laval
: 55228 56559 57406 58106 59713 ()
Depends on:
Reported: 2017-05-12 09:40 UTC by Mohak Barokar
Modified: 2017-09-25 18:24 UTC (History)
10 users (show)

Tags: Shiproom
Is this bug a regression?: Yes
Last known good build:

Designer Logs and Error Stacktrace (9.22 KB, application/zip)
2017-05-12 09:40 UTC, Mohak Barokar

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Description Mohak Barokar 2017-05-12 09:40:33 UTC
Created attachment 22110 [details]
Designer Logs and Error Stacktrace

Designer UI throws Null Pointer Exception when API Version 4.0 (v14) is selected.


Environment Info: https://gist.github.com/mohakbarokar/eb35761f65ca9cb432a96cc97615789a

Pre-Condition: Android 4.0 (API-14) is installed.

1. Create Android Application
2. Navigate to Resources > Layout
3. Open .axml file
4. Click on Version dropdown API's and select Android 4.0
5. Observe UI Rendering of Android Application


Expected Result: Application UI should render properly when API-14(Android 4.0) is selected

Actual Result: Designer window throws Null Pointer exception. 


Screencast Link: http://www.screencast.com/t/J1NzDVCqUx


Reproducible: 100%
Comment 2 Jon Douglas [MSFT] 2017-07-05 21:21:54 UTC
I can CONFIRM this behavior on VS4Mac running even 7.0.1 (build 24).

This also happens on VS 2017 -

mono.android.DesignerException: java.lang.NullPointerException
	at mono.android.DesignerException.fromThrowable(DesignerException.java:46)
	at mono.android.DesignerSession.checkRenderResultForError(DesignerSession.java:187)
	at mono.android.DesignerSession.load(DesignerSession.java:239)
	at mono.android.DesignerSession.processMessage(DesignerSession.java:702)
	at mono.android.MessageListener.executeMessage(MessageListener.java:88)
	at mono.android.MessageListener$Runner.run(MessageListener.java:44)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
	at android.content.res.Resources_Delegate.disposeSystem(Resources_Delegate.java:85)
	at com.android.layoutlib.bridge.android.BridgeContext.disposeResources(BridgeContext.java:264)
	at com.android.layoutlib.bridge.impl.RenderAction.tearDown(RenderAction.java:257)
	at com.android.layoutlib.bridge.impl.RenderAction.release(RenderAction.java:220)
	at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:438)
	at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:368)
	at mono.android.DesignerSession.load(DesignerSession.java:233)
	... 4 more

The limitation seems to be >= API 21 where it does indeed work. Anything below 21 fails with the exception above.
Comment 5 xamarin-release-manager 2017-07-12 19:19:19 UTC
Fixed in version (master)

Pull Request #2198 merged by: Alan McGovern
Author: xamarin
Commit: b43b6cdadff1c5b4f342443bb1c9f76edf845e3c (xamarin/md-addins)
Included in Commit: 41a90e6dffcccb8a23aa2f15543c0d48e3ab8d1b (mono/monodevelop)
Comment 8 Jon Douglas [MSFT] 2017-07-17 17:38:08 UTC
*** Bug 58106 has been marked as a duplicate of this bug. ***
Comment 9 Jon Douglas [MSFT] 2017-07-17 17:39:07 UTC
*** Bug 55228 has been marked as a duplicate of this bug. ***
Comment 10 Jon Douglas [MSFT] 2017-07-17 17:39:36 UTC
*** Bug 57406 has been marked as a duplicate of this bug. ***
Comment 11 Jon Douglas [MSFT] 2017-07-18 16:38:41 UTC
*** Bug 56559 has been marked as a duplicate of this bug. ***
Comment 12 Jon Douglas [MSFT] 2017-09-25 18:24:33 UTC
*** Bug 59713 has been marked as a duplicate of this bug. ***