Before and after image slider

  <it.marcomirisola.SlideToRevealImage
        android:id="@+id/mySlider"
        android:layout_width="match_parent"
        android:layout_height="300dp"
        app:slider_thumb="@mipmap/white_circle" 
        />

  //Inside java
  
  mySlider.setBeforeImage(imgUrl1).setAfterImage(imgUrl2)  

  //to change slider_thumb programmaticaly
  mySlider.setSliderThumb(yourDrawable)

  <!--  to set images from xml  -->
  app:before_image="@mipmap/image1"
  app:after_image="@mipmap/image2"

Gradle dependency

//add this to your top level build.gradle file
  maven { url 'https://jitpack.io' }
      
//and add this to your module level build.gradle file
 implementation 'com.github.MarcoMirisola:SlideToRevealImage-Android:v2.1.2'

The library uses Glide for image loading

This project is heavy based from before_after_slider from @developer--

iOS version