Android APIs
public class

NestedScrollingParentHelper

extends Object
java.lang.Object
   ↳ android.support.v4.view.NestedScrollingParentHelper

Class Overview

Helper class for implementing nested scrolling parent views compatible with Android platform versions earlier than Android 5.0 Lollipop (API 21).

ViewGroup subclasses should instantiate a final instance of this class as a field at construction. For each ViewGroup method that has a matching method signature in this class, delegate the operation to the helper instance in an overriden method implementation. This implements the standard framework policy for nested scrolling.

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 Constructors
NestedScrollingParentHelper(ViewGroup viewGroup)
Construct a new helper for a given ViewGroup
Public Methods
int getNestedScrollAxes()
Return the current axes of nested scrolling for this ViewGroup.
void onNestedScrollAccepted(View child, View target, int axes)
Called when a nested scrolling operation initiated by a descendant view is accepted by this ViewGroup.
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Inherited Methods
From class java.lang.Object

Public Constructors

public NestedScrollingParentHelper (ViewGroup viewGroup)

Construct a new helper for a given ViewGroup

Public Methods

public int getNestedScrollAxes ()

Return the current axes of nested scrolling for this ViewGroup.

This is a delegate method. Call it from your ViewGroup subclass method/NestedScrollingParent interface method with the same signature to implement the standard policy.

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

Called when a nested scrolling operation initiated by a descendant view is accepted by this ViewGroup.

This is a delegate method. Call it from your ViewGroup subclass method/NestedScrollingParent interface method with the same signature to implement the standard policy.