Android Cannot resolve symbol '?attr/selectableItemBackground'
AndroidAndroid XmlAndroid Problem Overview
<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:
Android Solutions
Solution 1 - Android
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
- LOCATE the
Gradle__com_android_support_xxx.xml
files - DELETE those files
- SYNC IDE with file system
- SYNC project with Gradle files
- 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.
Solution 2 - Android
For version Lollipop
and higher use this:
android:foreground="?android:attr/selectableItemBackground"
for Pre-Lollipop
use this:
android:foreground="?attr/selectableItemBackground"
Solution 3 - Android
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
Solution 4 - Android
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.)
Solution 5 - Android
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"
}
Solution 6 - Android
I have solved by,
- Deleting the .idea folder in project explorer.
- Invalidate Caches/Restart
- Refresh Project Gradle
Solution 7 - Android
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()
Solution 8 - Android
This is what solved to me:
- Close Android Studio
- Delete .idea directory in the root project directory
- Reimport the project
Solution 9 - Android
I updated my gradle version to 4.10.1 and fix and reimport repaired it. There were no libraries folder under .idea before.
Solution 10 - Android
If you use applicationContext
for LayoutInflater
, then replace it to normal context
. It works for me.