android ViewPager onPageChangeListener
16lz
2021-01-25
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ViewPager.OnPageChangeListener
public 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
| The new scroll state. |
See Also
SCROLL_STATE_IDLE 0SCROLL_STATE_DRAGGING 1SCROLL_STATE_SETTLING 2
public abstract 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
Position index of the first page currently being displayed. Page position+1 will be visible if positionOffset is nonzero.
positionOffset
Value from [0, 1) indicating the offset from the page at position.
positionOffsetPixels
Value in pixels indicating the offset from position.
public abstract void onPageSelected (int position)
This method will be invoked when a new page becomes selected. Animation is not necessarily complete.
Parameters
| Position index of the new selected page. |
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