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AppBarLayout.Behavior

public static class AppBarLayout.Behavior
extends Behavior<AppBarLayout>

java.lang.Object
↳	android.support.design.widget.CoordinatorLayout.Behavior<android.support.design.widget.AppBarLayout>
	↳	android.support.design.widget.AppBarLayout.Behavior

默认AppBarLayout.Behavior为AppBarLayout 。通过偏移实现必要的嵌套滚动处理。

Summary

Nested classes
`class`	`AppBarLayout.Behavior.DragCallback` 回调以允许控制任何`AppBarLayout`拖动。
`class`	`AppBarLayout.Behavior.SavedState`

Public constructors
`AppBarLayout.Behavior()`
`AppBarLayout.Behavior(Context context, AttributeSet attrs)`

Public methods
`int`	`getLeftAndRightOffset()`
`int`	`getTopAndBottomOffset()`
`boolean`	`onInterceptTouchEvent(CoordinatorLayout parent, V child, MotionEvent ev)` 在分派给子视图之前，响应CoordinatorLayout触摸事件。
`boolean`	`onLayoutChild(CoordinatorLayout parent, V child, int layoutDirection)` 当父母CoordinatorLayout关于布置给定子视图时调用。
`boolean`	`onLayoutChild(CoordinatorLayout parent, AppBarLayout abl, int layoutDirection)` 当父母CoordinatorLayout关于布置给定子视图时调用。
`boolean`	`onMeasureChild(CoordinatorLayout parent, AppBarLayout child, int parentWidthMeasureSpec, int widthUsed, int parentHeightMeasureSpec, int heightUsed)` 父母CoordinatorLayout即将测量给定子视图时调用。
`boolean`	`onNestedFling(CoordinatorLayout coordinatorLayout, AppBarLayout child, View target, float velocityX, float velocityY, boolean consumed)` 当嵌套滚动的小孩正在开始一个投射或一个将是一个投掷的动作时调用。
`void`	`onNestedPreScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, View target, int dx, int dy, int[] consumed)` 在目标已消耗任何滚动距离之前，正在进行嵌套滚动更新时调用。
`void`	`onNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, View target, int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed)` 当正在进行嵌套滚动更新并且目标已滚动或尝试滚动时调用。
`void`	`onRestoreInstanceState(CoordinatorLayout parent, AppBarLayout appBarLayout, Parcelable state)` 挂钩允许行为重新应用其以前由 `onSaveInstanceState(CoordinatorLayout, V)`生成的内部状态的表示。
`Parcelable`	`onSaveInstanceState(CoordinatorLayout parent, AppBarLayout appBarLayout)` Hook允许一个行为生成一个内部状态的表示，以后可以用它来创建一个具有相同状态的新实例。
`boolean`	`onStartNestedScroll(CoordinatorLayout parent, AppBarLayout child, View directTargetChild, View target, int nestedScrollAxes)` 当CoordinatorLayout的后代尝试启动嵌套滚动时调用。
`void`	`onStopNestedScroll(CoordinatorLayout coordinatorLayout, AppBarLayout abl, View target)` 当嵌套滚动结束时调用。
`boolean`	`onTouchEvent(CoordinatorLayout parent, V child, MotionEvent ev)` 在行为开始 `intercepting`之后，对CoordinatorLayout触摸事件 `intercepting` 。
`void`	`setDragCallback(AppBarLayout.Behavior.DragCallback callback)` 设置回调以控制任何 `AppBarLayout`拖动。
`boolean`	`setLeftAndRightOffset(int offset)`
`boolean`	`setTopAndBottomOffset(int offset)`

Protected methods
`void`	`layoutChild(CoordinatorLayout parent, V child, int layoutDirection)`

Inherited methods

From class android.support.design.widget.CoordinatorLayout.Behavior

From class java.lang.Object

Public constructors

AppBarLayout.Behavior

AppBarLayout.Behavior ()

AppBarLayout.Behavior

AppBarLayout.Behavior (Context context, 
                AttributeSet attrs)

Parameters
`context`	`Context`
`attrs`	`AttributeSet`

Public methods

getLeftAndRightOffset

int getLeftAndRightOffset ()

Returns
`int`

getTopAndBottomOffset

int getTopAndBottomOffset ()

Returns
`int`

onInterceptTouchEvent

boolean onInterceptTouchEvent (CoordinatorLayout parent, 
                V child, 
                MotionEvent ev)

在分派给子视图之前，响应CoordinatorLayout触摸事件。

行为可以使用它来监控入站触摸事件，直到决定拦截事件流的其余部分以对其关联的子视图执行操作为止。此方法将返回false直到它检测到正确的拦截条件，然后在发生这些条件后返回true。

一旦行为截取触摸事件，事件流的其余部分将被发送到 onTouchEvent(CoordinatorLayout, V, MotionEvent)方法。

此方法的默认实现始终返回false。

Parameters
`parent`	`CoordinatorLayout`: the parent view currently receiving this touch event
`child`	`V`: the child view associated with this Behavior
`ev`	`MotionEvent`: the MotionEvent describing the touch event being processed

Returns
`boolean`	true if this Behavior would like to intercept and take over the event stream. The default always returns false.

onLayoutChild

boolean onLayoutChild (CoordinatorLayout parent, 
                V child, 
                int layoutDirection)

当父母CoordinatorLayout关于布置给定子视图时调用。

此方法可用于执行子视图的自定义或修改布局，以取代默认子布局行为。行为的实现可以通过调用parent.onLayoutChild委托给标准CoordinatorLayout测量行为。

如果行为实现onDependentViewChanged(CoordinatorLayout, android.view.View, android.view.View)以响应相关视图更改而更改视图的位置，则还应该以尊重这些相关视图的方式实现onLayoutChild 。 onLayoutChild依赖关系后，将始终调用onLayoutChild依赖视图。

Parameters
`parent`	`CoordinatorLayout`: the parent CoordinatorLayout
`child`	`V`: child view to lay out
`layoutDirection`	`int`: the resolved layout direction for the CoordinatorLayout, such as `LAYOUT_DIRECTION_LTR` or `LAYOUT_DIRECTION_RTL`.

Returns
`boolean`	true if the Behavior performed layout of the child view, false to request default layout behavior

onLayoutChild

boolean onLayoutChild (CoordinatorLayout parent, 
                AppBarLayout abl, 
                int layoutDirection)

当父母CoordinatorLayout关于布置给定子视图时调用。

此方法可用于执行子视图的自定义或修改布局，以取代默认子布局行为。行为的实现可以通过调用parent.onLayoutChild委托给标准的CoordinatorLayout测量行为。

如果行为实现onDependentViewChanged(CoordinatorLayout, android.view.View, android.view.View)以响应相关视图更改而更改视图的位置，则还应该以尊重这些相关视图的方式实现onLayoutChild 。 onLayoutChild 在其依赖项已经布局后，将始终调用依赖视图。

Parameters
`parent`	`CoordinatorLayout`: the parent CoordinatorLayout
`abl`	`AppBarLayout`: child view to lay out
`layoutDirection`	`int`: the resolved layout direction for the CoordinatorLayout, such as `LAYOUT_DIRECTION_LTR` or `LAYOUT_DIRECTION_RTL`.

Returns
`boolean`	true if the Behavior performed layout of the child view, false to request default layout behavior

onMeasureChild

boolean onMeasureChild (CoordinatorLayout parent, 
                AppBarLayout child, 
                int parentWidthMeasureSpec, 
                int widthUsed, 
                int parentHeightMeasureSpec, 
                int heightUsed)

父母CoordinatorLayout即将测量给定子视图时调用。

此方法可用于执行自定义或修改的子视图测量，以代替默认的子测量行为。行为的实现可以通过调用parent.onMeasureChild委托给标准CoordinatorLayout测量行为。

Parameters
`parent`	`CoordinatorLayout`: the parent CoordinatorLayout
`child`	`AppBarLayout`: the child to measure
`parentWidthMeasureSpec`	`int`: the width requirements for this view
`widthUsed`	`int`: extra space that has been used up by the parent horizontally (possibly by other children of the parent)
`parentHeightMeasureSpec`	`int`: the height requirements for this view
`heightUsed`	`int`: extra space that has been used up by the parent vertically (possibly by other children of the parent)

Returns
`boolean`	true if the Behavior measured the child view, false if the CoordinatorLayout should perform its default measurement

onNestedFling

boolean onNestedFling (CoordinatorLayout coordinatorLayout, 
                AppBarLayout child, 
                View target, 
                float velocityX, 
                float velocityY, 
                boolean consumed)

当嵌套滚动的小孩正在开始一个投射或一个将是一个投掷的动作时调用。

任何与CoordinatorLayout的直接子项关联的行为都可以选择接受嵌套滚动，作为onStartNestedScroll(CoordinatorLayout, V, View, View, int)一部分。每个返回true的行为都将接收该嵌套滚动的后续嵌套滚动事件。

onNestedFling当当前嵌套滚动子视图检测到适合条件的适当条件时调用。它报告孩子本身是否消费了这一招。如果没有，该小孩预计会出现某种过度滚动的指示。如果这个方法消耗了这个方块，那么这个方法应该返回true，这样一个自己没有采取行动的孩子可以选择不显示超出指示。

Parameters
`coordinatorLayout`	`CoordinatorLayout`: the CoordinatorLayout parent of the view this Behavior is associated with
`child`	`AppBarLayout`: the child view of the CoordinatorLayout this Behavior is associated with
`target`	`View`: the descendant view of the CoordinatorLayout performing the nested scroll
`velocityX`	`float`: horizontal velocity of the attempted fling
`velocityY`	`float`: vertical velocity of the attempted fling
`consumed`	`boolean`: true if the nested child view consumed the fling

Returns
`boolean`	true if the Behavior consumed the fling

onNestedPreScroll

void onNestedPreScroll (CoordinatorLayout coordinatorLayout, 
                AppBarLayout child, 
                View target, 
                int dx, 
                int dy, 
                int[] consumed)

在目标已消耗任何滚动距离之前，正在进行嵌套滚动更新时调用。

与CoordinatorLayout的直接子项关联的任何行为都可以选择接受嵌套滚动，作为onStartNestedScroll(CoordinatorLayout, V, View, View, int)一部分。每个返回true的行为都将接收该嵌套滚动的后续嵌套滚动事件。

onNestedPreScroll嵌套滚动更新时，嵌套滚动子组自动消耗滚动距离之前调用onNestedPreScroll 。 每个响应嵌套滚动的行为都会收到相同的值。 CoordinatorLayout将报告消耗的任何方向上的最大像素数，即任何响应嵌套滚动的行为都被报告为已消耗。

Parameters
`coordinatorLayout`	`CoordinatorLayout`: the CoordinatorLayout parent of the view this Behavior is associated with
`child`	`AppBarLayout`: the child view of the CoordinatorLayout this Behavior is associated with
`target`	`View`: the descendant view of the CoordinatorLayout performing the nested scroll
`dx`	`int`: the raw horizontal number of pixels that the user attempted to scroll
`dy`	`int`: the raw vertical number of pixels that the user attempted to scroll
`consumed`	`int`: out parameter. consumed[0] should be set to the distance of dx that was consumed, consumed[1] should be set to the distance of dy that was consumed

onNestedScroll

void onNestedScroll (CoordinatorLayout coordinatorLayout, 
                AppBarLayout child, 
                View target, 
                int dxConsumed, 
                int dyConsumed, 
                int dxUnconsumed, 
                int dyUnconsumed)

当正在进行嵌套滚动更新并且目标已滚动或尝试滚动时调用。

任何与CoordinatorLayout的直接子项关联的行为都可能选择接受嵌套滚动，作为onStartNestedScroll(CoordinatorLayout, V, View, View, int)一部分。每个返回true的行为都将接收该嵌套滚动的后续嵌套滚动事件。

onNestedScroll嵌套滚动更新时，调用onNestedScroll滚动消耗和未消耗的滚动组件都以像素为单位提供。 每个响应嵌套滚动的行为都会收到相同的值。

Parameters
`coordinatorLayout`	`CoordinatorLayout`: the CoordinatorLayout parent of the view this Behavior is associated with
`child`	`AppBarLayout`: the child view of the CoordinatorLayout this Behavior is associated with
`target`	`View`: the descendant view of the CoordinatorLayout performing the nested scroll
`dxConsumed`	`int`: horizontal pixels consumed by the target's own scrolling operation
`dyConsumed`	`int`: vertical pixels consumed by the target's own scrolling operation
`dxUnconsumed`	`int`: horizontal pixels not consumed by the target's own scrolling operation, but requested by the user
`dyUnconsumed`	`int`: vertical pixels not consumed by the target's own scrolling operation, but requested by the user

onRestoreInstanceState

void onRestoreInstanceState (CoordinatorLayout parent, 
                AppBarLayout appBarLayout, 
                Parcelable state)

挂钩允许行为重新应用其以前由onSaveInstanceState(CoordinatorLayout, V)生成的内部状态的表示。这个函数永远不会被调用为null状态。

Parameters
`parent`	`CoordinatorLayout`: the parent CoordinatorLayout
`appBarLayout`	`AppBarLayout`: child view to restore from
`state`	`Parcelable`: The frozen state that had previously been returned by `onSaveInstanceState(CoordinatorLayout, V)`.

onSaveInstanceState

Parcelable onSaveInstanceState (CoordinatorLayout parent, 
                AppBarLayout appBarLayout)

Hook允许一个行为生成一个内部状态的表示，以后可以用它来创建一个具有相同状态的新实例。此状态应仅包含不持久或以后不能重建的信息。

行为状态仅在父级 CoordinatorLayout和使用此行为的视图设置有效ID时才被保存。

Parameters
`parent`	`CoordinatorLayout`: the parent CoordinatorLayout
`appBarLayout`	`AppBarLayout`: child view to restore from

Returns
`Parcelable`	Returns a Parcelable object containing the behavior's current dynamic state.

onStartNestedScroll

boolean onStartNestedScroll (CoordinatorLayout parent, 
                AppBarLayout child, 
                View directTargetChild, 
                View target, 
                int nestedScrollAxes)

当CoordinatorLayout的后代尝试启动嵌套滚动时调用。

与CoordinatorLayout的任何直接子节点相关联的任何行为都可能会响应此事件，并返回true以指示CoordinatorLayout应作为此滚动的嵌套滚动父级。只有从此方法返回true的行为才会接收后续的嵌套滚动事件。

Parameters
`parent`	`CoordinatorLayout`: the CoordinatorLayout parent of the view this Behavior is associated with
`child`	`AppBarLayout`: the child view of the CoordinatorLayout this Behavior is associated with
`directTargetChild`	`View`: the child view of the CoordinatorLayout that either is or contains the target of the nested scroll operation
`target`	`View`: the descendant view of the CoordinatorLayout initiating the nested scroll
`nestedScrollAxes`	`int`: the axes that this nested scroll applies to. See `SCROLL_AXIS_HORIZONTAL`, `SCROLL_AXIS_VERTICAL`

Returns
`boolean`	true if the Behavior wishes to accept this nested scroll

onStopNestedScroll

void onStopNestedScroll (CoordinatorLayout coordinatorLayout, 
                AppBarLayout abl, 
                View target)

当嵌套滚动结束时调用。

与CoordinatorLayout的任何直接子项关联的任何行为都可以选择接受嵌套滚动，作为onStartNestedScroll(CoordinatorLayout, V, View, View, int)一部分。每个返回true的行为都将接收该嵌套滚动的后续嵌套滚动事件。

onStopNestedScroll表示单个嵌套滚动事件序列的结束。这是清理与嵌套滚动相关的任何状态的好地方。

Parameters
`coordinatorLayout`	`CoordinatorLayout`: the CoordinatorLayout parent of the view this Behavior is associated with
`abl`	`AppBarLayout`: the child view of the CoordinatorLayout this Behavior is associated with
`target`	`View`: the descendant view of the CoordinatorLayout that initiated the nested scroll

onTouchEvent

boolean onTouchEvent (CoordinatorLayout parent, 
                V child, 
                MotionEvent ev)

在此行为已启动之后，响应CoordinatorLayout触摸事件 intercepting 。

行为可以拦截触摸事件以帮助CoordinatorLayout操纵其子视图。例如，行为可能允许用户拖动打开或关闭的UI窗格。该方法应该执行视图布局状态的实际突变。

Parameters
`parent`	`CoordinatorLayout`: the parent view currently receiving this touch event
`child`	`V`: the child view associated with this Behavior
`ev`	`MotionEvent`: the MotionEvent describing the touch event being processed

Returns
`boolean`	true if this Behavior handled this touch event and would like to continue receiving events in this stream. The default always returns false.

setDragCallback

void setDragCallback (AppBarLayout.Behavior.DragCallback callback)

设置一个回调来控制任何 AppBarLayout拖动。

Parameters
`callback`	`AppBarLayout.Behavior.DragCallback`: the callback to use, or `null` to use the default behavior.

setLeftAndRightOffset

boolean setLeftAndRightOffset (int offset)

Parameters
`offset`	`int`

Returns
`boolean`

setTopAndBottomOffset

boolean setTopAndBottomOffset (int offset)

Parameters
`offset`	`int`

Returns
`boolean`

Protected methods

layoutChild

void layoutChild (CoordinatorLayout parent, 
                V child, 
                int layoutDirection)

Parameters
`parent`	`CoordinatorLayout`
`child`	`V`
`layoutDirection`	`int`

Annotations

Interfaces

Classes

Most visited

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Results for

AppBarLayout.Behavior

Summary

Nested classes

Public constructors

Public methods

Protected methods

Inherited methods

Public constructors

AppBarLayout.Behavior

AppBarLayout.Behavior

Public methods

getLeftAndRightOffset

getTopAndBottomOffset

onInterceptTouchEvent

onLayoutChild

onLayoutChild

onMeasureChild

onNestedFling

onNestedPreScroll

onNestedScroll

onRestoreInstanceState

onSaveInstanceState

onStartNestedScroll

onStopNestedScroll

onTouchEvent

setDragCallback

setLeftAndRightOffset

setTopAndBottomOffset

Protected methods

layoutChild