Android: class not found exception: android.support.v4.app.FragmentPager

问题

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>
...

回答1:

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.

回答2:

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

File -> Project Structure

回答3:

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).

回答4:

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..

回答5:

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

回答6:

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

回答7:

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 :D

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

来源：https://stackoverflow.com/questions/10199430/android-class-not-found-exception-android-support-v4-app-fragmentpager

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android

classnotfoundexception