ViewPager2.OnPageChangeCallback
public abstract class ViewPager2.OnPageChangeCallback
Callback interface for responding to changing state of the selected page.
Summary
Public constructors |
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Public methods |
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void |
onPageScrollStateChanged(int state)Called when the scroll state changes. |
void |
onPageScrolled(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. |
Public constructors
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 SCROLL_STATE_IDLE, SCROLL_STATE_DRAGGING or SCROLL_STATE_SETTLING.
onPageScrolled
public 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 | |
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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
public 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. |