public abstract class

ViewPager2.OnPageChangeCallback

extends java.lang.Object

 java.lang.Object

↳androidx.viewpager2.widget.ViewPager2.OnPageChangeCallback

Overview

Callback interface for responding to changing state of the selected page.

Summary

Constructors
publicOnPageChangeCallback()

Methods
public voidonPageScrolled(int position, float positionOffset, int positionOffsetPixels)

This method will be invoked when the current page is scrolled, either as part of a programmatically initiated smooth scroll or a user initiated touch scroll.

public voidonPageScrollStateChanged(int state)

Called when the scroll state changes.

public voidonPageSelected(int position)

This method will be invoked when a new page becomes selected.

from java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructors

public OnPageChangeCallback()

Methods

public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels)

This method will be invoked when the current page is scrolled, either as part of a programmatically initiated smooth scroll or a user initiated touch scroll.

Parameters:

position: Position index of the first page currently being displayed. Page position+1 will be visible if positionOffset is nonzero.
positionOffset: Value from [0, 1) indicating the offset from the page at position.
positionOffsetPixels: Value in pixels indicating the offset from position.

public void onPageSelected(int position)

This method will be invoked when a new page becomes selected. Animation is not necessarily complete.

Parameters:

position: Position index of the new selected page.

public void onPageScrollStateChanged(int state)

Called when the scroll state changes. Useful for discovering when the user begins dragging, when a fake drag is started, when the pager is automatically settling to the current page, or when it is fully stopped/idle. state can be one of ViewPager2.SCROLL_STATE_IDLE, ViewPager2.SCROLL_STATE_DRAGGING or ViewPager2.SCROLL_STATE_SETTLING.

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