added in version 22.1.0
belongs to Maven artifact com.android.support:support-compat:28.0.0-alpha1

NestedScrollingParent

public interface NestedScrollingParent

android.support.v4.view.NestedScrollingParent
Known Indirect Subclasses


This interface should be implemented by ViewGroup subclasses that wish to support scrolling operations delegated by a nested child view.

Classes implementing this interface should create a final instance of a NestedScrollingParentHelper as a field and delegate any View or ViewGroup methods to the NestedScrollingParentHelper methods of the same signature.

Views invoking nested scrolling functionality should always do so from the relevant ViewCompat, ViewGroupCompat or ViewParentCompat compatibility shim static methods. This ensures interoperability with nested scrolling views on Android 5.0 Lollipop and newer.

Summary

Public methods

abstract int getNestedScrollAxes()

Return the current axes of nested scrolling for this NestedScrollingParent.

abstract boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed)

Request a fling from a nested scroll.

abstract boolean onNestedPreFling(View target, float velocityX, float velocityY)

React to a nested fling before the target view consumes it.

abstract void onNestedPreScroll(View target, int dx, int dy, int[] consumed)

React to a nested scroll in progress before the target view consumes a portion of the scroll.

abstract void onNestedScroll(View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed)

React to a nested scroll in progress.

abstract void onNestedScrollAccepted(View child, View target, int axes)

React to the successful claiming of a nested scroll operation.

abstract boolean onStartNestedScroll(View child, View target, int axes)

React to a descendant view initiating a nestable scroll operation, claiming the nested scroll operation if appropriate.

abstract void onStopNestedScroll(View target)

React to a nested scroll operation ending.

Public methods

getNestedScrollAxes

added in version 22.1.0
int getNestedScrollAxes ()

Return the current axes of nested scrolling for this NestedScrollingParent.

A NestedScrollingParent returning something other than