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()
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Public methods | |
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void
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onPageScrollStateChanged(int state)
Called when the scroll state changes. |
void
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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
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onPageSelected(int position)
This method will be invoked when a new page becomes selected. |
Inherited methods | |
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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 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.
| 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.
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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.
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