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

Question

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>
...

Answer 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.

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