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added in version 22.1.0
belongs to Maven artifact com.android.support:viewpager:28.0.0-alpha1

ViewPager.OnPageChangeListener

public static interface ViewPager.OnPageChangeListener

android.support.v4.view.ViewPager.OnPageChangeListener
Known Indirect Subclasses


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

Summary

Public methods

abstract void onPageScrollStateChanged(int state)

Called when the scroll state changes.

abstract 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.

abstract void onPageSelected(int position)

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

Public methods

onPageScrollStateChanged

added in version 22.1.0
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: The new scroll state.

onPageScrolled

added in version 22.1.0
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

added in version 22.1.0
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.