java.lang.ClassNotFoundException: Didn't find class "androidx.core.view.ViewPager" on path

Question

I just migrated my project to androidx and i am getting an inflation error for inflating viewpager component...I replaced android.support.v4.view.ViewPager with androidx.viewpager.widget.ViewPager

This my xml file

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="fill_parent"
      android:padding="@dimen/_1dp"
      android:layout_height="wrap_content"
      android:background="@color/banner_border_color">

      <androidx.viewpager.widget.ViewPager
           android:id="@+id/vp_slider"
           android:layout_width="match_parent"
           android:layout_height="@dimen/_140dp"
           android:background="@drawable/thumb_new_background" />

           <RelativeLayout
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:layout_gravity="bottom">

               <TextView
                   android:id="@+id/tv_banner_view_more"
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:layout_centerVertical="true"
                   android:layout_marginLeft="@dimen/_16dp"
                   android:background="@drawable/drawable_btn_curved"
                   android:paddingBottom="@dimen/_6dp"
                   android:paddingLeft="@dimen/_8dp"
                   android:paddingRight="@dimen/_8dp"
                   android:paddingTop="@dimen/_6dp"
                   android:visibility="gone"
                   android:text="@string/text_view_more"
                   android:textColor="@color/c_white"
                   android:textSize="@dimen/_8sp" />

     </RelativeLayout>

</FrameLayout>

The Error i'm getting :

Caused by: android.view.InflateException: Binary XML file line #329: Binary XML file line #8: Error inflating class androidx.core.view.ViewPager
         Caused by: android.view.InflateException: Binary XML file line #8: Error inflating class androidx.core.view.ViewPager
         Caused by: java.lang.ClassNotFoundException: Didn't find class "androidx.core.view.ViewPager" on path: DexPathList[

Auditorium

look like the error is in different xml file, search whole your project about androidx.core.view.ViewPager. if you don't find any place use androidx.core.view.ViewPager, then just need to clean project – Endermic

post your app build.gradle file. Hope you have not included it in any aar library – Polly

Have u added below implementation 'com.google.android.material:material:1.1.0-alpha06' dependencies in your build.gradle` file – Rehnberg

@SantanuSur yes my project have external aar file – Auditorium

@NileshRathod no this dependency not added – Auditorium

@Auditorium you need to add that dependencies in your build.gradle file – Rehnberg

Answer 1

You need to below dependencies in your build.gradle file

implementation 'com.google.android.material:material:1.1.0

Rehnberg

alpha08 is lattes avilable or need to stick with 06? – Auditorium

@Auditorium it's your choice if you want to use alpha08 or alpha06 I'm currently using alpha06 – Rehnberg

app still crashing after adding dependency :( – Auditorium

@Auditorium can u share latest crash log with question after adding these dependencies – Rehnberg

Answer 2

I figure out problem, When we merger to androidx then android studio convert viewpager, swipe to refresh layout and some other views to androidx.core for example viewpager its looks like androidx.core.view.ViewPager but correct is androidx.viewpager.widget.ViewPager please check in your xml layouts and see there is right component is added or not if there is androidx.core then check for right one and replace it. And also import dependency

implementation 'com.google.android.material:material:1.1.0-alpha08

Auditorium

@Auditorium Thanks a ton. for the catch in the XML layout – Shanta

Answer 3

You need to add below dependencies in your build.gradle file

implementation 'com.google.android.material:material:1.4.0

Bacciferous

Answer 4

I think you need to Invalidate caches and restart

Go to File > Invalidate caches/Restart > ** Invalidate

Then rebuild project

Sama

Answer 5

Upgrade build.gradle and gradle wrapper version

     classpath 'com.android.tools.build:gradle:4.2.1'
     distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-all.zip

Bulwark