ViewConfiguration
public
class
ViewConfiguration
extends Object
java.lang.Object | |
↳ | android.view.ViewConfiguration |
Contains methods to standard constants used in the UI for timeouts, sizes, and distances.
Summary
Public constructors | |
---|---|
ViewConfiguration()
This constructor is deprecated.
Use |
Public methods | |
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static
ViewConfiguration
|
get(Context context)
Returns a configuration for the specified visual |
static
float
|
getAmbiguousGestureMultiplier()
This method was deprecated
in API level 30.
Use |
static
long
|
getDefaultActionModeHideDuration()
|
static
int
|
getDoubleTapTimeout()
|
static
int
|
getEdgeSlop()
This method was deprecated
in API level 15.
Use |
static
int
|
getFadingEdgeLength()
This method was deprecated
in API level 15.
Use |
static
long
|
getGlobalActionKeyTimeout()
This method was deprecated in API level 20. This timeout should not be used by applications |
static
int
|
getJumpTapTimeout()
|
static
int
|
getKeyRepeatDelay()
|
static
int
|
getKeyRepeatTimeout()
|
static
int
|
getLongPressTimeout()
Used for both key and motion events. |
static
int
|
getMaximumDrawingCacheSize()
This method was deprecated
in API level 15.
Use |
static
int
|
getMaximumFlingVelocity()
This method was deprecated
in API level 15.
Use |
static
int
|
getMinimumFlingVelocity()
This method was deprecated
in API level 15.
Use |
static
int
|
getMultiPressTimeout()
|
static
int
|
getPressedStateDuration()
|
float
|
getScaledAmbiguousGestureMultiplier()
The multiplication factor for inhibiting default gestures. |
int
|
getScaledDoubleTapSlop()
|
int
|
getScaledEdgeSlop()
|
int
|
getScaledFadingEdgeLength()
|
int
|
getScaledHandwritingGestureLineMargin()
|
int
|
getScaledHandwritingSlop()
|
float
|
getScaledHorizontalScrollFactor()
|
int
|
getScaledHoverSlop()
|
int
|
getScaledMaximumDrawingCacheSize()
The maximum drawing cache size expressed in bytes. |
int
|
getScaledMaximumFlingVelocity(int inputDeviceId, int axis, int source)
Maximum absolute value of velocity to initiate a fling for a motion generated by an
|
int
|
getScaledMaximumFlingVelocity()
|
int
|
getScaledMinimumFlingVelocity(int inputDeviceId, int axis, int source)
Minimum absolute value of velocity to initiate a fling for a motion generated by an
|
int
|
getScaledMinimumFlingVelocity()
|
int
|
getScaledMinimumScalingSpan()
Retrieves the distance in pixels between touches that must be reached for a gesture to be interpreted as scaling. |
int
|
getScaledOverflingDistance()
|
int
|
getScaledOverscrollDistance()
|
int
|
getScaledPagingTouchSlop()
|
int
|
getScaledScrollBarSize()
|
int
|
getScaledTouchSlop()
|
float
|
getScaledVerticalScrollFactor()
|
int
|
getScaledWindowTouchSlop()
|
static
int
|
getScrollBarFadeDuration()
|
static
int
|
getScrollBarSize()
This method was deprecated
in API level 15.
Use |
static
int
|
getScrollDefaultDelay()
|
static
float
|
getScrollFriction()
The amount of friction applied to scrolls and flings. |
static
int
|
getTapTimeout()
|
static
int
|
getTouchSlop()
This method was deprecated
in API level 15.
Use |
static
int
|
getWindowTouchSlop()
This method was deprecated
in API level 15.
Use |
static
long
|
getZoomControlsTimeout()
The amount of time that the zoom controls should be displayed on the screen expressed in milliseconds. |
boolean
|
hasPermanentMenuKey()
Report if the device has a permanent menu key available to the user. |
boolean
|
shouldShowMenuShortcutsWhenKeyboardPresent()
Check if shortcuts should be displayed in menus. |
Inherited methods | |||||||||||||||||||||||
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|
Public constructors
ViewConfiguration
public ViewConfiguration ()
This constructor is deprecated.
Use get(android.content.Context)
instead.
Public methods
get
public static ViewConfiguration get (Context context)
Returns a configuration for the specified visual Context
. The configuration depends
on various parameters of the Context
, like the dimension of the display or the
density of the display.
Parameters | |
---|---|
context |
Context : A visual Context used to initialize the view configuration. It must
be Activity or other Context created with
Context#createWindowContext(int, Bundle) .
This value cannot be null . |
Returns | |
---|---|
ViewConfiguration |
getAmbiguousGestureMultiplier
public static float getAmbiguousGestureMultiplier ()
This method was deprecated
in API level 30.
Use getScaledAmbiguousGestureMultiplier()
.
The multiplication factor for inhibiting default gestures.
If a MotionEvent has MotionEvent.CLASSIFICATION_AMBIGUOUS_GESTURE
set,
then certain actions, such as scrolling, will be inhibited. However, to account for the
possibility of an incorrect classification, existing gesture thresholds (e.g. scrolling
touch slop and the long-press timeout) should be scaled by this factor and remain in effect.
Returns | |
---|---|
float |
Value is 1.0 or greater |
getDefaultActionModeHideDuration
public static long getDefaultActionModeHideDuration ()
Returns | |
---|---|
long |
the default duration in milliseconds for ActionMode#hide(long) . |
getDoubleTapTimeout
public static int getDoubleTapTimeout ()
Returns | |
---|---|
int |
the duration in milliseconds between the first tap's up event and the second tap's down event for an interaction to be considered a double-tap. |
getEdgeSlop
public static int getEdgeSlop ()
This method was deprecated
in API level 15.
Use getScaledEdgeSlop()
instead.
Returns | |
---|---|
int |
Inset in dips to look for touchable content when the user touches the edge of the screen |
getFadingEdgeLength
public static int getFadingEdgeLength ()
This method was deprecated
in API level 15.
Use getScaledFadingEdgeLength()
instead.
Returns | |
---|---|
int |
the length of the fading edges in dips |
getGlobalActionKeyTimeout
public static long getGlobalActionKeyTimeout ()
This method was deprecated
in API level 20.
This timeout should not be used by applications
The amount of time a user needs to press the relevant key to bring up the global actions dialog.
Returns | |
---|---|
long |
how long a user needs to press the relevant key to bring up the global actions dialog. |
getJumpTapTimeout
public static int getJumpTapTimeout ()
Returns | |
---|---|
int |
the duration in milliseconds we will wait to see if a touch event is a jump tap. If the user does not move within this interval, it is considered to be a tap. |
getKeyRepeatDelay
public static int getKeyRepeatDelay ()
Returns | |
---|---|
int |
the time between successive key repeats in milliseconds. |
getKeyRepeatTimeout
public static int getKeyRepeatTimeout ()
Returns | |
---|---|
int |
the time before the first key repeat in milliseconds. |
getLongPressTimeout
public static int getLongPressTimeout ()
Used for both key and motion events.
Returns | |
---|---|
int |
the duration in milliseconds before a press turns into a long press |
getMaximumDrawingCacheSize
public static int getMaximumDrawingCacheSize ()
This method was deprecated
in API level 15.
Use getScaledMaximumDrawingCacheSize()
instead.
The maximum drawing cache size expressed in bytes.
Returns | |
---|---|
int |
the maximum size of View's drawing cache expressed in bytes |
getMaximumFlingVelocity
public static int getMaximumFlingVelocity ()
This method was deprecated
in API level 15.
Use getScaledMaximumFlingVelocity()
instead.
Returns | |
---|---|
int |
Maximum velocity to initiate a fling, as measured in dips per second. |
getMinimumFlingVelocity
public static int getMinimumFlingVelocity ()
This method was deprecated
in API level 15.
Use getScaledMinimumFlingVelocity()
instead.
Returns | |
---|---|
int |
Minimum velocity to initiate a fling, as measured in dips per second. |
getMultiPressTimeout
public static int getMultiPressTimeout ()
Returns | |
---|---|
int |
the duration in milliseconds between the first tap's up event and the second tap's down event for an interaction to be considered part of the same multi-press. |
getPressedStateDuration
public static int getPressedStateDuration ()
Returns | |
---|---|
int |
the duration in milliseconds of the pressed state in child components. |
getScaledAmbiguousGestureMultiplier
public float getScaledAmbiguousGestureMultiplier ()
The multiplication factor for inhibiting default gestures.
If a MotionEvent has MotionEvent.CLASSIFICATION_AMBIGUOUS_GESTURE
set,
then certain actions, such as scrolling, will be inhibited. However, to account for the
possibility of an incorrect classification, existing gesture thresholds (e.g. scrolling
touch slop and the long-press timeout) should be scaled by this factor and remain in effect.
Returns | |
---|---|
float |
Value is 1.0 or greater |
getScaledDoubleTapSlop
public int getScaledDoubleTapSlop ()
Returns | |
---|---|
int |
Distance in pixels between the first touch and second touch to still be considered a double tap |
getScaledEdgeSlop
public int getScaledEdgeSlop ()
Returns | |
---|---|
int |
Inset in pixels to look for touchable content when the user touches the edge of the screen |
getScaledFadingEdgeLength
public int getScaledFadingEdgeLength ()
Returns | |
---|---|
int |
the length of the fading edges in pixels |
getScaledHandwritingGestureLineMargin
public int getScaledHandwritingGestureLineMargin ()
Returns | |
---|---|
int |
margin in pixels around text line bounds where stylus handwriting gestures should be supported. |
getScaledHandwritingSlop
public int getScaledHandwritingSlop ()
Returns | |
---|---|
int |
Distance in pixels a stylus touch can wander before we think the user is handwriting. |
getScaledHorizontalScrollFactor
public float getScaledHorizontalScrollFactor ()
Returns | |
---|---|
float |
Amount to scroll in response to a horizontal MotionEvent#ACTION_SCROLL event.
Multiply this by the event's axis value to obtain the number of pixels to be scrolled. |
getScaledHoverSlop
public int getScaledHoverSlop ()
Returns | |
---|---|
int |
Distance in pixels a hover can wander while it is still considered "stationary". |
getScaledMaximumDrawingCacheSize
public int getScaledMaximumDrawingCacheSize ()
The maximum drawing cache size expressed in bytes.
Returns | |
---|---|
int |
the maximum size of View's drawing cache expressed in bytes |
getScaledMaximumFlingVelocity
public int getScaledMaximumFlingVelocity (int inputDeviceId, int axis, int source)
Maximum absolute value of velocity to initiate a fling for a motion generated by an
InputDevice
with an id of inputDeviceId
, from an input source
and on
a given motion event axis
.
Similar to getScaledMinimumFlingVelocity(int, int, int)
, but for maximum fling
velocity, instead of minimum. Also, unlike that method which returns
Integer.MAX_VALUE
for bad input device ID, source and/or motion event axis inputs,
this method returns Integer.MIN_VALUE
for such bad inputs.
Parameters | |
---|---|
inputDeviceId |
int |
axis |
int |
source |
int |
Returns | |
---|---|
int |
getScaledMaximumFlingVelocity
public int getScaledMaximumFlingVelocity ()
Returns | |
---|---|
int |
Maximum velocity to initiate a fling, as measured in pixels per second. |
getScaledMinimumFlingVelocity
public int getScaledMinimumFlingVelocity (int inputDeviceId, int axis, int source)
Minimum absolute value of velocity to initiate a fling for a motion generated by an
InputDevice
with an id of inputDeviceId
, from an input source
and on
a given motion event axis
.
Before utilizing this method to get a minimum fling velocity for a motion generated by the input device, scale the velocity of the motion events generated by the input device to pixels per second.
For instance, if you tracked MotionEvent#AXIS_SCROLL
vertical velocities generated
from a InputDevice#SOURCE_ROTARY_ENCODER
, the velocity returned from
VelocityTracker
will be in the units with which the axis values were reported in the
motion event. Before comparing that velocity against the minimum fling velocity specified
here, make sure that the MotionEvent#AXIS_SCROLL
velocity from the tracker is
calculated in "units per second" (see VelocityTracker#computeCurrentVelocity(int)
,
VelocityTracker#computeCurrentVelocity(int, float)
to adjust your velocity
computations to "per second"), and use getScaledVerticalScrollFactor()
to change this
velocity value to "pixels/second".
If the provided inputDeviceId
is not valid, or if the input device whose ID is
provided does not support the given motion event source and/or axis, this method will return
Integer.MAX_VALUE
.
Obtaining the correct arguments for this method call
inputDeviceId: if calling this method in response to a MotionEvent
, use
the device ID that is reported by the event, which can be obtained using
MotionEvent#getDeviceId()
. Otherwise, use a valid ID that is obtained from
InputDevice#getId()
, or from an InputManager
instance
(InputManager#getInputDeviceIds()
gives all the valid input device IDs).
axis: a MotionEvent
may report data for multiple axes, and each axis may
have multiple data points for different pointers. Use the axis for which you obtained the
velocity for (VelocityTracker
lets you calculate velocities for a specific axis. Use
the axis for which you calculated velocity). You can use
InputDevice#getMotionRanges()
to get all the InputDevice.MotionRange
s for the
InputDevice
, from which you can derive all the valid axes for the device.
source: use MotionEvent#getSource()
if calling this method in response to a
MotionEvent
. Otherwise, use a valid source for the InputDevice
. You can use
InputDevice#getMotionRanges()
to get all the InputDevice.MotionRange
s for the
InputDevice
, from which you can derive all the valid sources for the device.
This method optimizes calls over multiple input device IDs, so caching the return value of the method is not necessary if you are handling multiple input devices.
Parameters | |
---|---|
inputDeviceId |
int : the ID of the InputDevice that generated the motion triggering
fling. |
axis |
int : the axis on which the motion triggering the fling happened. This axis should be
a valid axis that can be reported by the provided input device from the provided
input device source. |
source |
int : the input source of the motion causing fling. This source should be a valid
source for the InputDevice whose ID is inputDeviceId . |
Returns | |
---|---|
int |
the minimum velocity, in pixels/second, to trigger fling. |
getScaledMinimumFlingVelocity
public int getScaledMinimumFlingVelocity ()
Returns | |
---|---|
int |
Minimum velocity to initiate a fling, as measured in pixels per second. |
getScaledMinimumScalingSpan
public int getScaledMinimumScalingSpan ()
Retrieves the distance in pixels between touches that must be reached for a gesture to be interpreted as scaling. In general, scaling shouldn't start until this distance has been met or surpassed, and scaling should end when the distance in pixels between touches drops below this distance.
Returns | |
---|---|
int |
The distance in pixels |
Throws | |
---|---|
IllegalStateException |
if this method is called on a ViewConfiguration that was instantiated using a constructor with no Context parameter. |
getScaledOverflingDistance
public int getScaledOverflingDistance ()
Returns | |
---|---|
int |
The maximum distance a View should overfling by when showing edge effects (in pixels). |
getScaledOverscrollDistance
public int getScaledOverscrollDistance ()
Returns | |
---|---|
int |
The maximum distance a View should overscroll by when showing edge effects (in pixels). |
getScaledPagingTouchSlop
public int getScaledPagingTouchSlop ()
Returns | |
---|---|
int |
Distance in pixels a touch can wander before we think the user is scrolling a full page |
getScaledScrollBarSize
public int getScaledScrollBarSize ()
Returns | |
---|---|
int |
The width of the horizontal scrollbar and the height of the vertical scrollbar in pixels |
getScaledTouchSlop
public int getScaledTouchSlop ()
Returns | |
---|---|
int |
Distance in pixels a touch can wander before we think the user is scrolling |
getScaledVerticalScrollFactor
public float getScaledVerticalScrollFactor ()
Returns | |
---|---|
float |
Amount to scroll in response to a vertical MotionEvent#ACTION_SCROLL event.
Multiply this by the event's axis value to obtain the number of pixels to be scrolled. |
getScaledWindowTouchSlop
public int getScaledWindowTouchSlop ()
Returns | |
---|---|
int |
Distance in pixels a touch must be outside the bounds of a window for it to be counted as outside the window for purposes of dismissing that window. |
getScrollBarFadeDuration
public static int getScrollBarFadeDuration ()
Returns | |
---|---|
int |
Duration of the fade when scrollbars fade away in milliseconds |
getScrollBarSize
public static int getScrollBarSize ()
This method was deprecated
in API level 15.
Use getScaledScrollBarSize()
instead.
Returns | |
---|---|
int |
The width of the horizontal scrollbar and the height of the vertical scrollbar in dips |
getScrollDefaultDelay
public static int getScrollDefaultDelay ()
Returns | |
---|---|
int |
Default delay before the scrollbars fade in milliseconds |
getScrollFriction
public static float getScrollFriction ()
The amount of friction applied to scrolls and flings.
Returns | |
---|---|
float |
A scalar dimensionless value representing the coefficient of friction. |
getTapTimeout
public static int getTapTimeout ()
Returns | |
---|---|
int |
the duration in milliseconds we will wait to see if a touch event is a tap or a scroll. If the user does not move within this interval, it is considered to be a tap. |
getTouchSlop
public static int getTouchSlop ()
This method was deprecated
in API level 15.
Use getScaledTouchSlop()
instead.
Returns | |
---|---|
int |
Distance in dips a touch can wander before we think the user is scrolling |
getWindowTouchSlop
public static int getWindowTouchSlop ()
This method was deprecated
in API level 15.
Use getScaledWindowTouchSlop()
instead.
Returns | |
---|---|
int |
Distance in dips a touch must be outside the bounds of a window for it to be counted as outside the window for purposes of dismissing that window. |
getZoomControlsTimeout
public static long getZoomControlsTimeout ()
The amount of time that the zoom controls should be displayed on the screen expressed in milliseconds.
Returns | |
---|---|
long |
the time the zoom controls should be visible expressed in milliseconds. |
hasPermanentMenuKey
public boolean hasPermanentMenuKey ()
Report if the device has a permanent menu key available to the user.
As of Android 3.0, devices may not have a permanent menu key available. Apps should use the action bar to present menu options to users. However, there are some apps where the action bar is inappropriate or undesirable. This method may be used to detect if a menu key is present. If not, applications should provide another on-screen affordance to access functionality.
Returns | |
---|---|
boolean |
true if a permanent menu key is present, false otherwise. |
shouldShowMenuShortcutsWhenKeyboardPresent
public boolean shouldShowMenuShortcutsWhenKeyboardPresent ()
Check if shortcuts should be displayed in menus.
Returns | |
---|---|
boolean |
True if shortcuts should be displayed in menus. |