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Added in API level 9

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OverScroller

public class OverScroller
extends Object

java.lang.Object
↳	android.widget.OverScroller

这个类封装了滚动功能，可以超越滚动操作的范围。在大多数情况下，此课程是Scroller替代品。

Summary

Public constructors
`OverScroller(Context context)` 使用粘性流体滚动内插器和飞轮创建OverScroller。
`OverScroller(Context context, Interpolator interpolator)` 创建启用飞轮的OverScroller。
`OverScroller(Context context, Interpolator interpolator, float bounceCoefficientX, float bounceCoefficientY)` 创建启用飞轮的OverScroller。
`OverScroller(Context context, Interpolator interpolator, float bounceCoefficientX, float bounceCoefficientY, boolean flywheel)` 创建一个OverScroller。

Public methods
`void`	`abortAnimation()` 停止动画。
`boolean`	`computeScrollOffset()` 当你想知道新的位置时调用它。
`void`	`fling(int startX, int startY, int velocityX, int velocityY, int minX, int maxX, int minY, int maxY)`
`void`	`fling(int startX, int startY, int velocityX, int velocityY, int minX, int maxX, int minY, int maxY, int overX, int overY)` 基于一个扔手势开始滚动。
`final void`	`forceFinished(boolean finished)` 强制完成的字段为特定值。
`float`	`getCurrVelocity()` 返回当前速度的绝对值。
`final int`	`getCurrX()` 返回滚动中的当前X偏移量。
`final int`	`getCurrY()` 返回滚动中的当前Y偏移量。
`final int`	`getFinalX()` 返回滚动结束的位置。
`final int`	`getFinalY()` 返回滚动结束的位置。
`final int`	`getStartX()` 返回滚动中的起始X偏移量。
`final int`	`getStartY()` 返回滚动中的起始Y偏移量。
`final boolean`	`isFinished()` 返回滚动器是否完成滚动。
`boolean`	`isOverScrolled()` 返回当前Scroller当前是否返回有效位置。
`void`	`notifyHorizontalEdgeReached(int startX, int finalX, int overX)` 通知滚动条我们已经达到了水平边界。
`void`	`notifyVerticalEdgeReached(int startY, int finalY, int overY)` 通知滚动器我们已达到垂直边界。
`final void`	`setFriction(float friction)` 施加在fl上的摩擦量。
`boolean`	`springBack(int startX, int startY, int minX, int maxX, int minY, int maxY)` 当你想'回弹'到有效的坐标范围内时调用它。
`void`	`startScroll(int startX, int startY, int dx, int dy, int duration)` 通过提供起始点和距离来开始滚动。
`void`	`startScroll(int startX, int startY, int dx, int dy)` 通过提供起始点和距离来开始滚动。

Inherited methods

From class java.lang.Object

Public constructors

OverScroller

Added in API level 9

OverScroller (Context context)

使用粘性流体滚动内插器和飞轮创建OverScroller。

OverScroller

Added in API level 9

OverScroller (Context context, 
                Interpolator interpolator)

创建启用飞轮的OverScroller。

Parameters
`context`	`Context`: The context of this application.
`interpolator`	`Interpolator`: The scroll interpolator. If null, a default (viscous) interpolator will be used.

OverScroller

Added in API level 9

OverScroller (Context context, 
                Interpolator interpolator, 
                float bounceCoefficientX, 
                float bounceCoefficientY)

创建启用飞轮的OverScroller。

Parameters
`context`	`Context`: The context of this application.
`interpolator`	`Interpolator`: The scroll interpolator. If null, a default (viscous) interpolator will be used.
`bounceCoefficientX`	`float`: A value between 0 and 1 that will determine the proportion of the velocity which is preserved in the bounce when the horizontal edge is reached. A null value means no bounce. This behavior is no longer supported and this coefficient has no effect.
`bounceCoefficientY`	`float`: Same as bounceCoefficientX but for the vertical direction. This behavior is no longer supported and this coefficient has no effect. !deprecated Use {!link #OverScroller(Context, Interpolator, boolean)} instead.

OverScroller

Added in API level 11

OverScroller (Context context, 
                Interpolator interpolator, 
                float bounceCoefficientX, 
                float bounceCoefficientY, 
                boolean flywheel)

创建一个OverScroller。

Parameters
`context`	`Context`: The context of this application.
`interpolator`	`Interpolator`: The scroll interpolator. If null, a default (viscous) interpolator will be used.
`bounceCoefficientX`	`float`: A value between 0 and 1 that will determine the proportion of the velocity which is preserved in the bounce when the horizontal edge is reached. A null value means no bounce. This behavior is no longer supported and this coefficient has no effect.
`bounceCoefficientY`	`float`: Same as bounceCoefficientX but for the vertical direction. This behavior is no longer supported and this coefficient has no effect.
`flywheel`	`boolean`: If true, successive fling motions will keep on increasing scroll speed. !deprecated Use {!link OverScroller(Context, Interpolator, boolean)} instead.

Public methods

abortAnimation

Added in API level 9

void abortAnimation ()

停止动画。与forceFinished(boolean)相反，放弃动画会导致滚动条移动到最终的x和y位置。

也可以看看：

forceFinished(boolean)

computeScrollOffset

Added in API level 9

boolean computeScrollOffset ()

当你想知道新的位置时调用它。如果它返回true，那么动画还没有完成。

Returns
`boolean`

fling

Added in API level 9

void fling (int startX, 
                int startY, 
                int velocityX, 
                int velocityY, 
                int minX, 
                int maxX, 
                int minY, 
                int maxY)

Parameters
`startX`	`int`
`startY`	`int`
`velocityX`	`int`
`velocityY`	`int`
`minX`	`int`
`maxX`	`int`
`minY`	`int`
`maxY`	`int`

fling

Added in API level 9

void fling (int startX, 
                int startY, 
                int velocityX, 
                int velocityY, 
                int minX, 
                int maxX, 
                int minY, 
                int maxY, 
                int overX, 
                int overY)

基于一个扔手势开始滚动。行进的距离将取决于投掷的初始速度。

Parameters
`startX`	`int`: Starting point of the scroll (X)
`startY`	`int`: Starting point of the scroll (Y)
`velocityX`	`int`: Initial velocity of the fling (X) measured in pixels per second.
`velocityY`	`int`: Initial velocity of the fling (Y) measured in pixels per second
`minX`	`int`: Minimum X value. The scroller will not scroll past this point unless overX > 0. If overfling is allowed, it will use minX as a springback boundary.
`maxX`	`int`: Maximum X value. The scroller will not scroll past this point unless overX > 0. If overfling is allowed, it will use maxX as a springback boundary.
`minY`	`int`: Minimum Y value. The scroller will not scroll past this point unless overY > 0. If overfling is allowed, it will use minY as a springback boundary.
`maxY`	`int`: Maximum Y value. The scroller will not scroll past this point unless overY > 0. If overfling is allowed, it will use maxY as a springback boundary.
`overX`	`int`: Overfling range. If > 0, horizontal overfling in either direction will be possible.
`overY`	`int`: Overfling range. If > 0, vertical overfling in either direction will be possible.

forceFinished

Added in API level 9

void forceFinished (boolean finished)

强制完成的字段为特定值。与abortAnimation()相反，强制动画完成并不会导致滚动条移动到最终的x和y位置。

Parameters
`finished`	`boolean`: The new finished value.

getCurrVelocity

Added in API level 14

float getCurrVelocity ()

返回当前速度的绝对值。

Returns
`float`	The original velocity less the deceleration, norm of the X and Y velocity vector.

getCurrX

Added in API level 9

int getCurrX ()

返回滚动中的当前X偏移量。

Returns
`int`	The new X offset as an absolute distance from the origin.

getCurrY

Added in API level 9

int getCurrY ()

返回滚动中的当前Y偏移量。

Returns
`int`	The new Y offset as an absolute distance from the origin.

getFinalX

Added in API level 9

int getFinalX ()

返回滚动结束的位置。仅适用于“一瞥”卷轴。

Returns
`int`	The final X offset as an absolute distance from the origin.

getFinalY

Added in API level 9

int getFinalY ()

返回滚动结束的位置。仅适用于“一瞥”卷轴。

Returns
`int`	The final Y offset as an absolute distance from the origin.

getStartX

Added in API level 9

int getStartX ()

返回滚动中的起始X偏移量。

Returns
`int`	The start X offset as an absolute distance from the origin.

getStartY

Added in API level 9

int getStartY ()

返回滚动中的起始Y偏移量。

Returns
`int`	The start Y offset as an absolute distance from the origin.

isFinished

Added in API level 9

boolean isFinished ()

返回滚动器是否完成滚动。

Returns
`boolean`	True if the scroller has finished scrolling, false otherwise.

isOverScrolled

Added in API level 9

boolean isOverScrolled ()

返回当前Scroller当前是否返回有效位置。有效边界由fling(int, int, int, int, int, int, int, int, int, int)方法提供。在调用startScroll(int, int, int, int)前应检查该值，因为当前正在进行的插值将恢复有效位置，然后停止。来电者必须考虑到开始滚动将从超滚动位置开始的事实。

Returns
`boolean`	true when the current position is overscrolled and in the process of interpolating back to a valid value.

notifyHorizontalEdgeReached

Added in API level 9

void notifyHorizontalEdgeReached (int startX, 
                int finalX, 
                int overX)

通知滚动条我们已经达到了水平边界。通常情况下，动画启动时已经知道处理这些信息，例如在对其中一个函数的调用中。但有些情况下，这种情况不能预先知道。此功能将根据需要将当前动作和动画从startX转换为finalX。

Parameters
`startX`	`int`: Starting/current X position
`finalX`	`int`: Desired final X position
`overX`	`int`: Magnitude of overscroll allowed. This should be the maximum desired distance from finalX. Absolute value - must be positive.

notifyVerticalEdgeReached

Added in API level 9

void notifyVerticalEdgeReached (int startY, 
                int finalY, 
                int overY)

通知滚动器我们已达到垂直边界。通常情况下，动画启动时已经知道处理这些信息，例如在对其中一个函数的调用中。但有些情况下，这种情况不能预先知道。此函数将动画从startY到finalY的抛物线运动。

Parameters
`startY`	`int`: Starting/current Y position
`finalY`	`int`: Desired final Y position
`overY`	`int`: Magnitude of overscroll allowed. This should be the maximum desired distance from finalY. Absolute value - must be positive.

setFriction

Added in API level 11

void setFriction (float friction)

施加在fl上的摩擦量。默认值是getScrollFriction() 。

Parameters
`friction`	`float`: A scalar dimension-less value representing the coefficient of friction.

springBack

Added in API level 9

boolean springBack (int startX, 
                int startY, 
                int minX, 
                int maxX, 
                int minY, 
                int maxY)

当你想'回弹'到有效的坐标范围内时调用它。

Parameters
`startX`	`int`: Starting X coordinate
`startY`	`int`: Starting Y coordinate
`minX`	`int`: Minimum valid X value
`maxX`	`int`: Maximum valid X value
`minY`	`int`: Minimum valid Y value
`maxY`	`int`: Minimum valid Y value

Returns
`boolean`	true if a springback was initiated, false if startX and startY were already within the valid range.

startScroll

Added in API level 9

void startScroll (int startX, 
                int startY, 
                int dx, 
                int dy, 
                int duration)

通过提供起始点和距离来开始滚动。

Parameters
`startX`	`int`: Starting horizontal scroll offset in pixels. Positive numbers will scroll the content to the left.
`startY`	`int`: Starting vertical scroll offset in pixels. Positive numbers will scroll the content up.
`dx`	`int`: Horizontal distance to travel. Positive numbers will scroll the content to the left.
`dy`	`int`: Vertical distance to travel. Positive numbers will scroll the content up.
`duration`	`int`: Duration of the scroll in milliseconds.

startScroll

Added in API level 9

void startScroll (int startX, 
                int startY, 
                int dx, 
                int dy)

通过提供起始点和距离来开始滚动。滚动将在持续时间内使用默认值250毫秒。

Parameters
`startX`	`int`: Starting horizontal scroll offset in pixels. Positive numbers will scroll the content to the left.
`startY`	`int`: Starting vertical scroll offset in pixels. Positive numbers will scroll the content up.
`dx`	`int`: Horizontal distance to travel. Positive numbers will scroll the content to the left.
`dy`	`int`: Vertical distance to travel. Positive numbers will scroll the content up.

Annotations

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Exceptions

Most visited

Recently visited

Results for

OverScroller

Summary

Public constructors

Public methods

Inherited methods

Public constructors

OverScroller

OverScroller

OverScroller

OverScroller

Public methods

abortAnimation

computeScrollOffset

fling

fling

forceFinished

getCurrVelocity

getCurrX

getCurrY

getFinalX

getFinalY

getStartX

getStartY

isFinished

isOverScrolled

notifyHorizontalEdgeReached

notifyVerticalEdgeReached

setFriction

springBack

startScroll

startScroll