Android Cannot resolve symbol '?attr/selectableItemBackground'-ThrowExceptions

Exception or error:
<android.support.v7.widget.CardView
    android:id="@+id/card_view"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginLeft="@dimen/card_outer_padding"
    android:layout_marginTop="@dimen/card_outer_padding"
    android:layout_marginRight="@dimen/card_outer_padding"
    android:layout_marginBottom='@{model.cardBottomMargin}'
    android:foreground="?attr/selectableItemBackground"
    android:onClick="@{model::onCardClick}"
    app:cardElevation="2dp"
    app:cardCornerRadius="2dp"
    app:cardUseCompatPadding="true">
</android.support.v7.widget.CardView>

I got this error message

Cannot resolve symbol ?attr/selectableItemBackground
Validates resource references inside Android XML files.

<TextView
    android:id="@+id/country_name"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginRight="40dp"
    android:text="@{model.name}"
    style="@style/TextAppearance.AppCompat.Headline"
    tools:text="Country"/>

And, I got a similar error for the above as well

Cannot resolve symbol ‘@style/TextAppearance.AppCompat.Headline’
Validates resource references inside Android XML files.

Any pointer would be great! Thank you!
It seems to be related to this thread but no solution was provided:

How to solve:

I believe this is a communication problem with the IDE and Android Gradle Plugin. In any case, the only way I’ve reliably found to resolve this is to delete the problematic libs in the .idea/libraries/ folder.

So, for you, since the lint checks aren’t recognizing ?attr/selectableItemBackground

  1. LOCATE the Gradle__com_android_support_xxx.xml files
  2. DELETE those files
  3. SYNC IDE with file system
  4. SYNC project with Gradle files
  5. REBUILD your project

You can sync by clicking on ‘File’ at the top by the toolbar and selecting “Sync with File System” and then afterwards selecting “Sync project with gradle files”.

I’ve tried other suggested solutions – had the appcompat-v7 dependency in my module build.gradle file & the google() repository as the first line in the project build.gradle dependencies. Nada.

These solutions also haven’t helped…

  • Invalidating the caches/restarting didn’t work.
  • Cleaning/Rebuilding the project.

###

For version Lollipop and higher use this:

android:foreground="?android:attr/selectableItemBackground"

for Pre-Lollipop use this:

android:foreground="?attr/selectableItemBackground"

###

2 options:

Option 1

Another possible reason is: Google’s maven repository is not set for
the build script.

Open your project’s main build.gradle add this line:

buildscript {
    repositories {
        google()  <-- this
        // Be also sure that google() is before jcenter()
    }
}

Without this, it may not be able to download the Android Studio Gradle
plugin 3.0+. It’s not distributed in jCenter but in the Google’s maven
repository.

Option 2

Run this command in root of project and resync project

Linux:

rm .idea/libraries/Gradle__com_android_support_*.xml

Windows:

del .idea\libraries\Gradle__com_android_support_*.xml

###

I faced with same error after updating Kotlin. Solved with “Invalidate caches/Restart”


UPDATE
Today this solution did not helped me. But the solution of this question did: Android Studio 3.1 Cannot Resolve Symbol (Themes, Widget, attr, etc.)

###

Both resources are defined with the Android Support Library and since these symbols cannot be resolved, it seems like you’re missing to define the support dependency.

dependencies {
    compile "com.android.support:appcompat-v7:$androidSupportVersion"
}

###

In my case help adding maven to build.gradle Project in buildscripts.repositories AND allprojects.repositories. It looks like this:

google()
maven { url 'https://maven.google.com' }
jcenter()

###

I have solved by,

  • Deleting the .idea folder in project explorer.
  • Invalidate Caches/Restart
  • Refresh Project Gradle

###

This is what solved to me:

  1. Close Android Studio
  2. Delete .idea directory in the root project directory

enter image description here

  1. Reimport the project

enter image description here

###

I updated my gradle version to 4.10.1 and fix and reimport repaired it. There were no libraries folder under .idea before.

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