Updated Sdk Version, Getting Classnotfoundexception: Android.Support.V4.View.Viewpager

Updated SDK version, getting ClassNotFoundException: android.support.v4.view.ViewPager

Go to Project->Properties->Java Build Path than select Order and export tab.
Set android-support-v4.jar library checked and up it into top of the list.
And then clean and rebuild project.

ClassNotFoundException re android.support.v4.view.ViewPager when inflating

If you are using implementation "androidx.viewpager:viewpager:1.0.0"

Also, change in XML file too

<androidx.viewpager.widget.ViewPager
    android:id="@+id/pager"
    android:layout_width="match_parent"
    android:layout_height="fill_parent"/>

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

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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ClassNotFoundException: android.support.v4.View.ViewPager

Change android.support.v4.View.ViewPager to android.support.v4.view.ViewPager

Error inflating class android.support.v4.view.ViewPager

Make sure that you place your libraries in a common folder such as libs in your project.

Right click on the jar, then select Build Path and click on Add to Build Path.

That will add your library to your project. If everything is correct, you can see it in a generated "folder" in the project called "Referenced Libraries"

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