ViewPager.OnPageChangeListener

public interface ViewPager.OnPageChangeListener

Known direct subclasses
ViewPager.SimpleOnPageChangeListener

Simple implementation of the OnPageChangeListener interface with stub implementations of each method.

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

Summary

Public methods
abstract void

Called when the scroll state changes.
abstract void
onPageScrolled(
    int position,
    float positionOffset,
    @Px 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 1.1.0
abstract 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
int state

The new scroll state.
See also
SCROLL_STATE_IDLE
SCROLL_STATE_DRAGGING
SCROLL_STATE_SETTLING

onPageScrolled

Added in 1.1.0
abstract void onPageScrolled(
    int position,
    float positionOffset,
    @Px 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
int position

Position index of the first page currently being displayed. Page position+1 will be visible if positionOffset is nonzero.
float positionOffset

Value from [0, 1) indicating the offset from the page at position.
@Px int positionOffsetPixels

Value in pixels indicating the offset from position.

onPageSelected

Added in 1.1.0
abstract void onPageSelected(int position)

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

Parameters
int position

Position index of the new selected page.