classnotfoundexception – Android: class not found exception: android.support.v4.app.FragmentPager-ThrowExceptions

Exception or error:

In my code I
import android.support.v4.view.ViewPager
but I get a ClassNotFoundException: android.support.v4.view.ViewPager when I set content view to this xml file:

...
 <android.support.v4.app.FragmentPager 
     android:layout_height="0px" 
     android:layout_width="match_parent" 
     android:layout_weight="1" 
     android:id="@+id/pager"> 
     </android.support.v4.app.FragmentPager>
...
How to solve:

You have to add compatibility library by right clicking your project and selecting Android Tools -> Add Compatibility Library. Once its added, clean your project and build again.


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i’m using Android Studio Beta 0.8.6 and i had to do it this way


File -> Project Structure
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Go to <Your android apk folder>\sdk\extras\android\support\v4 folder and add android-support-v4.jar to app library (or whole sdk library).

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Add Support library by right clicking your project and selecting Android Tools -> Add Compatibility Library.
After adding Support Library clean your project and Go to Java Build Path, Go to Order and Export [Last tab] click all currently added Jar files and libraries..press Ok and refresh your Project..
It works fine for me..

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You should add android.support.v4 jar to your app.

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If it is not gradle based then You should Migrate Eclipse ADT based project to Gradle based..
Import Project into android studio..

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I had this problem please right click on your project and click Android Tools and now click Support Libraries and then Accept License Now Run your Project It will Work 😀

RightClick==>Android Tools==>Support Libraries ==>Accept License

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