OnPageChangeListener
interface OnPageChangeListener
| androidx.viewpager.widget.ViewPager.OnPageChangeListener |
Callback interface for responding to changing state of the selected page.
Summary
| Public methods | |
|---|---|
| abstract Unit |
onPageScrollStateChanged(state: Int)Called when the scroll state changes. |
| abstract Unit |
onPageScrolled(position: Int, positionOffset: Float, @Px positionOffsetPixels: Int)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 Unit |
onPageSelected(position: Int)This method will be invoked when a new page becomes selected. |
Public methods
onPageScrollStateChanged
abstract fun onPageScrollStateChanged(state: Int): Unit
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
abstract fun onPageScrolled(
position: Int,
positionOffset: Float,
@Px positionOffsetPixels: Int
): Unit
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. |