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How to customize ViewPager2 animation in Kotlin Android

How to customize ViewPager2 animation in Kotlin Android.

Here is a detailed step-by-step tutorial on how to customize ViewPager2 animation in Kotlin Android:

Step 1: Create a new project​

Start by creating a new Android project in Android Studio. Choose an empty activity template and set the project name and package name according to your needs.

Step 2: Add ViewPager2 dependency​

Open the build.gradle file for your app module and add the following dependency to the dependencies block:

implementation 'androidx.viewpager2:viewpager2:1.0.0'

Sync the project to download and add the ViewPager2 library to your project.

Step 3: Set up ViewPager2 in the layout file​

Open the activity_main.xml layout file and add a ViewPager2 widget to your layout. Here's an example:

<androidx.viewpager2.widget.ViewPager2
    android:id="@+id/viewPager"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

Step 4: Create a custom PageTransformer​

Create a new Kotlin class called CustomPageTransformer. This class will be responsible for customizing the animation of the ViewPager2. Add the following code to the class:

class CustomPageTransformer : ViewPager2.PageTransformer {
    override fun transformPage(page: View, position: Float) {
        // Customize the animation of the page here
        // You can apply any animations or transformations to the page based on its position
    }
}

Step 5: Set the custom PageTransformer to the ViewPager2​

Open the MainActivity.kt file and add the following code inside the onCreate method:

val viewPager = findViewById<ViewPager2>(R.id.viewPager)
viewPager.adapter = MyPagerAdapter() // Replace MyPagerAdapter with your own adapter
viewPager.setPageTransformer(CustomPageTransformer())

Make sure to replace MyPagerAdapter with your own custom adapter class that extends RecyclerView.Adapter<RecyclerView.ViewHolder>.

Step 6: Customize the animation​

Inside the transformPage method of the CustomPageTransformer class, you can customize the animation of each page based on its position. Here are a few examples:

  • Apply a fade animation:
page.alpha = 1 - abs(position)
  • Apply a scale animation:
val scaleFactor = 0.85f + (1 - abs(position)) * 0.15f
page.scaleX = scaleFactor
page.scaleY = scaleFactor
  • Apply a rotation animation:
page.rotation = 360f * abs(position)

Feel free to experiment with different animations and transformations to achieve the desired effect.

Step 7: Test the custom animation​

Build and run your app on an emulator or a physical device to see the custom animation in action. Swipe through the ViewPager2 to observe the customized animation.

That's it! You have successfully customized the ViewPager2 animation in Kotlin Android.