[Solved] could not be found (Android Studio 1.1 Preview)

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I’m trying to add CardView to my activity as the official sample. But it doesn’t work.

If I run my project directly, it would lead to java.lang.ClassNotFoundException: .

Enquirer: WildCat


Solution #1:

You should add it to your build.gradle:

dependencies {
    implementation ''
    implementation ''
Respondent: Eun

Solution #2:

With the release of Android 9.0 (API level 28) there is a new version of the support library called AndroidX

And the support library will be discontinued…

Add the following to buld.gradle:app

dependencies {
    implementation 'androidx.recyclerview:recyclerview:1.0.0'
    implementation 'androidx.cardview:cardview:1.0.0'
Respondent: Then Enok

Solution #3:

Writing my answer to provide:

1) updated version for compileSdkVersion 27.

2) usage of implementation instead of compileWhat’s the difference between implementation and compile in Gradle?.

3) a complete version number to heed the Avoid using + in version numbers; can lead to unpredictable and unrepeatable builds.., warning shown by Android Studio.

4) a visual for location of build.gradle (Module:app).

5) And because I was not able to write a comment below @Eun’s answer.

You need to paste implementation '' in build.gradle [Module:app] located at, for example: MyFirstApplication -> app -> build.gradle

Paste in following dependencies clause:

dependencies {
   implementation fileTree(dir: 'libs', include: ['*.jar'])
   implementation ''

   implementation ''


To open from Android studio itself: (From left side) 1:Project -> Select Android view -> Gradle Scripts -> build.gradle (Module: app)

That is:
(If the image below is not shown You can find the image here.

Using Android Studio 3.1.4

Edit: Updated version numbers.

Respondent: Vinay Vissh

Solution #4:

dependencies {
    compile ''
    compile ''
Respondent: Vivek Hirpara

Solution #5:

I was facing this issue because of the corruption of cached cardview aar.

Gradle was picking local cached version of cardview. Also works by changing the library version but make sure you are not overriding configurations.all


Close Android Studio,
In windows goto C:UsersQamar.gradlecaches and search cardview delete your version folder, clean and rebuild.

Using: Android Studio 3.3 and gradle:3.2.1

Respondent: Qamar

Solution #6:

It is all because of dependency and android version problems.


For RecyclerView:


Instead of: <

For CardView:


Instead of: <

**Or simply search for and drag and drop, CardView, RecyclerView ..etc from palette panel.

For dependencies that supports AndroidX:

implementation 'androidx.recyclerview:recyclerview:1.1.0'
implementation 'androidx.cardview:cardview:1.0.0'

Go To this Article for full description:

Respondent: Salah

Solution #7:

In your xml file change

Respondent: Sanket Kushwaha

Solution #8:

Just click on sync now at right top side

Respondent: Bhushan

Solution #9:

To avoid mistakes during adding CardView, you can use Android Studio tools. In the main menu open “Project structure…“, then “Dependencies“, “+” and “cardview” in the search line.

At the moment Android Studio adds ‘androidx.cardview:cardview:1.0.0’ line to your build.gradle file. Then you can use “<androidx.cardview.widget.CardView>” in your layouts.

Maybe after a year or two the version or the package name will change.

Respondent: Verter

The answers/resolutions are collected from stackoverflow, are licensed under cc by-sa 2.5 , cc by-sa 3.0 and cc by-sa 4.0 .

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