Jetpack Compose Viewpager

Jetpack Compose Viewpager is a library that provides a ViewPager component for Jetpack Compose. ViewPager is a UI component that allows the user to swipe horizontally through a series of screens or pages. This library provides an easy-to-use and customizable ViewPager component that works seamlessly with Jetpack Compose.

Features

• Easy-to-use API for creating ViewPager component in Jetpack Compose.
• Customizable ViewPager component with many configuration options.
• Supports swipe gestures and page animations.
• Supports both vertical and horizontal orientation.
• Supports infinite scrolling.

Installation

Add the following dependency to your app's build.gradle file:

dependencies {
    implementation 'com.google.accompanist:accompanist-pager:0.12.0'
}

Usage

To use Jetpack Compose Viewpager in your app, you need to create a Pager composable, which works like a regular Composable function, but is used to create the ViewPager component.

@Composable
fun MyPager() {
    val pagerState = rememberPagerState()
    Pager(
        state = pagerState,
        modifier = Modifier.fillMaxSize(),
        orientation = Orientation.Horizontal,
        // other configuration options
    ) {
        // composable function that is called for each page
    }
}

In the Pager composable, you can define the orientation, page content and other configuration options. The state parameter should be a PagerState, which is used to manage the state of the ViewPager component.

To create the content of each page, you can use a composable function that is called for each page. This function should take a pageIndex parameter, which is used to create different content for each page.

Pager(
    state = pagerState,
    modifier = Modifier.fillMaxSize(),
    orientation = Orientation.Horizontal,
) { pageIndex ->
    Column(
        modifier = Modifier.fillMaxSize(),
        verticalArrangement = Arrangement.Center,
        horizontalAlignment = Alignment.CenterHorizontally
    ) {
        Text(text = "Page $pageIndex")
    }
}

Customization

Jetpack Compose Viewpager provides many configuration options to customize the ViewPager component. Here are some of the most commonly used options:

• orientation: Specifies the orientation of the ViewPager, either Horizontal or Vertical.
• pageCount: Specifies the number of pages in the ViewPager.
• offscreenLimit: Specifies the number of pages to keep in memory on either side of the current page.
• peekSize: Specifies the size of the pages that are partially visible on either side of the current page.
• pageTransformer: Specifies a PageTransformer object that is used to animate the pages when they are swiped.
• dragEnabled: Enables or disables the swipe gestures on the ViewPager.
• infiniteLoop: Enables or disables infinite scrolling.

Pager(
    state = pagerState,
    modifier = Modifier.fillMaxSize(),
    orientation = Orientation.Horizontal,
    pageCount = 3,
    offscreenLimit = 1,
    peekSize = 16.dp,
    pageTransformer = { page, position ->
        // page animation logic
    },
    dragEnabled = true,
    infiniteLoop = true
) { pageIndex ->
    // page content
}

Conclusion

Jetpack Compose Viewpager is a great library for creating swipable ViewPager components in Jetpack Compose. It provides an easy-to-use API and many customization options, making it a flexible component for many use cases. With the growing popularity of Jetpack Compose, this library is sure to become an essential tool for Android developers.