Xamarin build ERROR : error APT0000: In ..., unable to find attribute

Question

I received a project from another developer. I setup my machine. VS-2017 with the required components was already configured.

Android SDK-Manager has the corresponding version installed. Project is configured to compile with Android 7.1 (Nougat).

Starting the build I get one error

1>ERROR : error APT0000: In <declare-styleable> AppBarLayout, unable to find attribute android:keyboardNavigationCluster

It is unclear to me, were I need to set this information, or were this information is needed.

I rececked ERROR: In MenuView, unable to find attribute android:preserveIconSpacing and Error:In SherlockSpinner, unable to find attribute android:popupPromptView. Both articles don't help.

I rechecked the SDK-Tools, I deleted the folder C:\Users\<user>\AppData\Local\Xamarin.

As far as I understand the message there is an attribute missing, that needs to be set.

In a project file Resource.designer.cs I found

public const int AppBarLayout_android_keyboardNavigationCluster = 2;

The name seams to match exactly.

Can someone explain me this error?

Can someone explain how I get rid of it and how to fix similar problems in future?

I mentioned this already in my post. I didn't see any solution for me. What point I should try. (Even I think I checked all)... — xMRi, Oct 27 '17 at 12:05
Have you tried restarting `Visual Studio` ? What version of support libraries are you using? — Nongthonbam Tonthoi, Oct 27 '17 at 12:27
Yes. Surely I tried a restart. Android Versions 25, 26, 27 are installed (and more). — xMRi, Oct 27 '17 at 13:32
I meant what versions of support libraries are you using, you may need to update that. — Nongthonbam Tonthoi, Oct 27 '17 at 13:41
I updated all what is required and offered by the SDK-Manager. — xMRi, Oct 27 '17 at 13:42
Please refer to : https://forums.xamarin.com/discussion/105287/what-is-error-apt0000-cannot-find-attr-android-keyboardnavigationcluster-apt0000 — York Shen, Oct 30 '17 at 06:03

score 8 · Answer 1 · edited Dec 01 '17 at 12:28

8

I had this error and after some research I just installed the Android OREO 8.0 SDK in the Android SDK Manager and than I select Android Project > Properties > Application > Use latest Platform (Android 8.0 (Oreo)). And it worked for me.

edited Dec 01 '17 at 12:28

Ankit Patidar

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answered Dec 01 '17 at 12:19

canvee

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score 3 · Answer 2 · answered Dec 05 '17 at 11:01

3

I fixed it by setting the Target Android Version to API Level 26.

answered Dec 05 '17 at 11:01

Abdullah Tahan

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score 2 · Answer 3 · answered Jan 11 '18 at 03:28

2

You have to update the target of your project, It seems that the solution was created with a higher target (Oreo API Level 26)

answered Jan 11 '18 at 03:28

edgarmtze

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score 0 · Answer 4 · answered Nov 09 '17 at 16:56

Thsi is what I did, I don't know what of the steps fixed the problems.

Uninstalled all Android SDKs with the SDK manager
Uninstalled the Xamarin components.

1.+2. Was done by uninstalling the App-Development features from VS-2017

Install Xamarin and current SDKs.

After this I was able to select "Use latest platform (Android 8.0 Oreo)" in the Android project section in the Solution.

This wasn't possible before. I just could select "Android 7.1 (Nougat)" and 8.0 didn't showed up (but was installed). Now the error is gone.

score 0 · Answer 5 · answered Dec 08 '17 at 08:55

In my case I'd moved from Enterprise to Professional and found that there was a mismatch in the Xamarin options (Tools -> Options -> Xamarin) and the android SDK location needed to be changed to "C:\Users\YourMum\AppData\Local\Android\android-sdk".

Can't remember exactly what it was originally but think it was in Programs.

Xamarin build ERROR : error APT0000: In ..., unable to find attribute

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