Bug 35245 - Xamarin.Designer.DesignerException: You must specifiy a valid layout reference. The layout ID @layout/toolbar is not valid.
Summary: Xamarin.Designer.DesignerException: You must specifiy a valid layout referenc...
Status: RESOLVED NOT_REPRODUCIBLE
Alias: None
Product: Android
Classification: Xamarin
Component: Designer ()
Version: 5.1
Hardware: PC Mac OS
: --- normal
Target Milestone: ---
Assignee: Jérémie Laval
URL:
Depends on:
Blocks:
 
Reported: 2015-10-26 00:34 UTC by Prashant Cholachagudda
Modified: 2017-06-28 15:11 UTC (History)
2 users (show)

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

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Status:
RESOLVED NOT_REPRODUCIBLE

Description Prashant Cholachagudda 2015-10-26 00:34:06 UTC
When we add 

<include android:id="@+id/toolbar" layout="@layout/toolbar"/>

in a layout.axml file, the designer can no longer show the layout in content view, and gives the error "The layout could not be loaded: You must specify a valid layout reference. The layout ID @layout/toolbar is not valid.

The toolbar is saved in the file Resources/layout/toolbar.axml and contains:

<?xml version="1.0" encoding="UTF-8" ?>
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="40dp"
android:layout_alignParentTop="true"
android:minHeight="40dp"
android:background="#FFFF8000"
android:theme="@android:style/ThemeOverlay.Material.Dark.ActionBar"
android:popupTheme="@android:style/ThemeOverlay.Material.Light" />

This is only a designer issue. If we compile the app and run it on a device, the toolbar is shown correctly. If we insert the toolbar tag directly into the layout file instead of using the <include> tag, the designer works correctly, but that limits the ability to re-use it on multiple layouts.

You can find the sample code at - https://blog.xamarin.com/android-tips-hello-material-design-v7-appcompat/

# Stacktrace 

ERROR [2015-10-15 12:19:46Z]: Session initialization failed
Xamarin.Designer.DesignerException: Exception of type 'Xamarin.Designer.DesignerException' was thrown.
   at Xamarin.AndroidDesigner.JavaProcessConnection.GetResponse(BinaryMessage message, Int32 timeout)
   at Xamarin.AndroidDesigner.JavaProcessConnection.SendMessage(BinaryMessage message)
   at Xamarin.AndroidDesigner.AndroidRenderSession.InitSession(DesignerSessionParams refreshConfiguration, String& errorMessage)

# Version information

=== Xamarin Studio ===

Version 5.9.7 (build 22)
Installation UUID: e8c608a8-7812-483f-bc4e-52c93740d711
Runtime:
Microsoft .NET 4.0.30319.42000
GTK+ 2.24.22 (MS-Windows theme)
GTK# 2.12.26

=== Xamarin.Android ===

Version: 5.1.7 (Enterprise Edition)
Android SDK: C:\Program Files (x86)\Android\android-sdk
Supported Android versions:
4.0.3 (API level 15)
4.1 (API level 16)
4.4 (API level 19)
5.0 (API level 21)
5.1 (API level 22)
6.0 (API level 23)
Java SDK: C:\Program Files\Java\jdk1.8.0_60
java version "1.8.0_60"
Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)

=== Xamarin Android Player ===

Version: 0.6.1
Location: C:\Program Files\Xamarin Android Player\DeviceManager.exe

=== Build Information ===

Release ID: 509070022
Git revision: 6bd1f169df44ca96addf8a035316c535a4fa46fa
Build date: 2015-09-30 10:13:51-04
Xamarin addins: 1c3e5c0859bdfec0ecd481a57ad6c03bc22f5536

=== Operating System ===

Windows 6.2.9200.0 (64-bit)
Comment 1 Adam Hartley [MSFT] 2017-06-28 15:11:53 UTC
Unfortunately, we’re unable to reproduce this report. If this issue is still occurring for you, please reopen this issue and attach a reproduction to the bug by starting with a clean Xamarin.Android project adding just the code necessary to demonstrate the issue.