ViewPager.SimpleOnPageChangeListener
class ViewPager.SimpleOnPageChangeListener : ViewPager.OnPageChangeListener
Simple implementation of the OnPageChangeListener interface with stub implementations of each method. Extend this if you do not intend to override every method of OnPageChangeListener.
Summary
Public constructors |
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Public functions |
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Unit |
onPageScrollStateChanged(state: Int)Called when the scroll state changes. |
Unit |
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. |
Unit |
onPageSelected(position: Int)This method will be invoked when a new page becomes selected. |
Public constructors
Public functions
onPageScrollStateChanged
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 | |
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state: Int |
The new scroll state. |
onPageScrolled
fun onPageScrolled(
position: Int,
positionOffset: Float,
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. |
onPageSelected
fun onPageSelected(position: Int): Unit
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. |