ViewPager2.OnPageChangeCallback

public static abstract class ViewPager2.OnPageChangeCallback
extends Object

java.lang.Object
   ↳ androidx.viewpager2.widget.ViewPager2.OnPageChangeCallback

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

Summary

Public constructors

ViewPager2.OnPageChangeCallback()

Public methods

void onPageScrollStateChanged(int state)

Called when the scroll state changes.

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.

void onPageSelected(int position)

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

Inherited methods

Public constructors

ViewPager2.OnPageChangeCallback

public ViewPager2.OnPageChangeCallback ()

Public methods

onPageScrollStateChanged

public void onPageScrollStateChanged (int state)

Called when the scroll state changes. Useful for discovering when the user begins dragging, when the pager is automatically settling to the current page, or when it is fully stopped/idle.

Parameters
state int

onPageScrolled

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

onPageSelected

public void onPageSelected (int position)

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

Parameters
position int: Position index of the new selected page.