DrawableWrapper
public
abstract
class
DrawableWrapper
extends Drawable
implements
Drawable.Callback
java.lang.Object | ||
↳ | android.graphics.drawable.Drawable | |
↳ | android.graphics.drawable.DrawableWrapper |
Drawable container with only one child element.
Summary
Public constructors | |
---|---|
DrawableWrapper(Drawable dr)
Creates a new wrapper around the specified drawable. |
Public methods | |
---|---|
void
|
applyTheme(Resources.Theme t)
Applies the specified theme to this Drawable and its children. |
boolean
|
canApplyTheme()
|
void
|
draw(Canvas canvas)
Draw in its bounds (set via setBounds) respecting optional effects such as alpha (set via setAlpha) and color filter (set via setColorFilter). |
int
|
getAlpha()
Gets the current alpha value for the drawable. |
int
|
getChangingConfigurations()
Return a mask of the configuration parameters for which this drawable may change, requiring that it be re-created. |
ColorFilter
|
getColorFilter()
Returns the current color filter, or |
Drawable.ConstantState
|
getConstantState()
Return a |
Drawable
|
getDrawable()
|
void
|
getHotspotBounds(Rect outRect)
Populates |
int
|
getIntrinsicHeight()
Returns the drawable's intrinsic height. |
int
|
getIntrinsicWidth()
Returns the drawable's intrinsic width. |
int
|
getOpacity()
This method is deprecated. This method is no longer used in graphics optimizations |
Insets
|
getOpticalInsets()
Return in insets the layout insets suggested by this Drawable for use with alignment operations during layout. |
void
|
getOutline(Outline outline)
Called to get the drawable to populate the Outline that defines its drawing area. |
boolean
|
getPadding(Rect padding)
Return in padding the insets suggested by this Drawable for placing content inside the drawable's bounds. |
boolean
|
hasFocusStateSpecified()
Indicates whether this drawable has at least one state spec explicitly
specifying |
void
|
inflate(Resources r, XmlPullParser parser, AttributeSet attrs, Resources.Theme theme)
Inflate this Drawable from an XML resource optionally styled by a theme. |
void
|
invalidateDrawable(Drawable who)
Called when the drawable needs to be redrawn. |
boolean
|
isStateful()
Indicates whether this drawable will change its appearance based on state. |
void
|
jumpToCurrentState()
If this Drawable does transition animations between states, ask that it immediately jump to the current state and skip any active animations. |
Drawable
|
mutate()
Make this drawable mutable. |
boolean
|
onLayoutDirectionChanged(int layoutDirection)
Called when the drawable's resolved layout direction changes. |
void
|
scheduleDrawable(Drawable who, Runnable what, long when)
A Drawable can call this to schedule the next frame of its animation. |
void
|
setAlpha(int alpha)
Specify an alpha value for the drawable. |
void
|
setColorFilter(ColorFilter colorFilter)
Specify an optional color filter for the drawable. |
void
|
setDrawable(Drawable dr)
Sets the wrapped drawable. |
void
|
setHotspot(float x, float y)
Specifies the hotspot's location within the drawable. |
void
|
setHotspotBounds(int left, int top, int right, int bottom)
Sets the bounds to which the hotspot is constrained, if they should be different from the drawable bounds. |
void
|
setTintBlendMode(BlendMode blendMode)
Specifies a tint blending mode for this drawable. |
void
|
setTintList(ColorStateList tint)
Specifies tint color for this drawable as a color state list. |
boolean
|
setVisible(boolean visible, boolean restart)
Set whether this Drawable is visible. |
void
|
unscheduleDrawable(Drawable who, Runnable what)
A Drawable can call this to unschedule an action previously
scheduled with |
Protected methods | |
---|---|
void
|
onBoundsChange(Rect bounds)
Override this in your subclass to change appearance if you vary based on the bounds. |
boolean
|
onLevelChange(int level)
Override this in your subclass to change appearance if you vary based on level. |
boolean
|
onStateChange(int[] state)
Override this in your subclass to change appearance if you recognize the specified state. |
Inherited methods | |
---|---|
Public constructors
DrawableWrapper
public DrawableWrapper (Drawable dr)
Creates a new wrapper around the specified drawable.
Parameters | |
---|---|
dr |
Drawable : the drawable to wrap
This value may be null . |
Public methods
applyTheme
public void applyTheme (Resources.Theme t)
Applies the specified theme to this Drawable and its children.
Parameters | |
---|---|
t |
Resources.Theme : This value cannot be null . |
draw
public void draw (Canvas canvas)
Draw in its bounds (set via setBounds) respecting optional effects such as alpha (set via setAlpha) and color filter (set via setColorFilter).
Parameters | |
---|---|
canvas |
Canvas : This value cannot be null . |
getAlpha
public int getAlpha ()
Gets the current alpha value for the drawable. 0 means fully transparent, 255 means fully opaque. This method is implemented by Drawable subclasses and the value returned is specific to how that class treats alpha. The default return value is 255 if the class does not override this method to return a value specific to its use of alpha.
Returns | |
---|---|
int |
Value is between 0 and 255 inclusive |
getChangingConfigurations
public int getChangingConfigurations ()
Return a mask of the configuration parameters for which this drawable
may change, requiring that it be re-created. The default implementation
returns whatever was provided through
setChangingConfigurations(int)
or 0 by default. Subclasses
may extend this to or in the changing configurations of any other
drawables they hold.
getColorFilter
public ColorFilter getColorFilter ()
Returns the current color filter, or null
if none set.
Returns | |
---|---|
ColorFilter |
the current color filter, or null if none set |
getConstantState
public Drawable.ConstantState getConstantState ()
Return a ConstantState
instance that holds the shared state of this Drawable.
Returns | |
---|---|
Drawable.ConstantState |
This value may be null . |
getDrawable
public Drawable getDrawable ()
Returns | |
---|---|
Drawable |
the wrapped drawable
This value may be null . |
getHotspotBounds
public void getHotspotBounds (Rect outRect)
Populates outRect
with the hotspot bounds.
Parameters | |
---|---|
outRect |
Rect : This value cannot be null . |
getIntrinsicHeight
public int getIntrinsicHeight ()
Returns the drawable's intrinsic height.
Intrinsic height is the height at which the drawable would like to be laid out, including any inherent padding. If the drawable has no intrinsic height, such as a solid color, this method returns -1.
Returns | |
---|---|
int |
the intrinsic height, or -1 if no intrinsic height |
getIntrinsicWidth
public int getIntrinsicWidth ()
Returns the drawable's intrinsic width.
Intrinsic width is the width at which the drawable would like to be laid out, including any inherent padding. If the drawable has no intrinsic width, such as a solid color, this method returns -1.
Returns | |
---|---|
int |
the intrinsic width, or -1 if no intrinsic width |
getOpacity
public int getOpacity ()
This method is deprecated.
This method is no longer used in graphics optimizations
Return the opacity/transparency of this Drawable. The returned value is
one of the abstract format constants in
PixelFormat
:
PixelFormat.UNKNOWN
,
PixelFormat.TRANSLUCENT
,
PixelFormat.TRANSPARENT
, or
PixelFormat.OPAQUE
.
An OPAQUE drawable is one that draws all all content within its bounds, completely covering anything behind the drawable. A TRANSPARENT drawable is one that draws nothing within its bounds, allowing everything behind it to show through. A TRANSLUCENT drawable is a drawable in any other state, where the drawable will draw some, but not all, of the content within its bounds and at least some content behind the drawable will be visible. If the visibility of the drawable's contents cannot be determined, the safest/best return value is TRANSLUCENT.
Generally a Drawable should be as conservative as possible with the
value it returns. For example, if it contains multiple child drawables
and only shows one of them at a time, if only one of the children is
TRANSLUCENT and the others are OPAQUE then TRANSLUCENT should be
returned. You can use the method resolveOpacity(int, int)
to perform a
standard reduction of two opacities to the appropriate single output.
Note that the returned value does not necessarily take into account a
custom alpha or color filter that has been applied by the client through
the setAlpha(int)
or setColorFilter(ColorFilter)
methods. Some subclasses,
such as BitmapDrawable
, ColorDrawable
, and GradientDrawable
,
do account for the value of setAlpha(int)
, but the general behavior is dependent
upon the implementation of the subclass.
Returns | |
---|---|
int |
int The opacity class of the Drawable.
Value is PixelFormat.UNKNOWN , PixelFormat.TRANSLUCENT , PixelFormat.TRANSPARENT , or PixelFormat.OPAQUE |
getOpticalInsets
public Insets getOpticalInsets ()
Return in insets the layout insets suggested by this Drawable for use with alignment operations during layout.
Returns | |
---|---|
Insets |
This value cannot be null . |
getOutline
public void getOutline (Outline outline)
Called to get the drawable to populate the Outline that defines its drawing area.
This method is called by the default ViewOutlineProvider
to define
the outline of the View.
The default behavior defines the outline to be the bounding rectangle of 0 alpha. Subclasses that wish to convey a different shape or alpha value must override this method.
Parameters | |
---|---|
outline |
Outline : This value cannot be null . |
getPadding
public boolean getPadding (Rect padding)
Return in padding the insets suggested by this Drawable for placing content inside the drawable's bounds. Positive values move toward the center of the Drawable (set Rect.inset).
Parameters | |
---|---|
padding |
Rect : This value cannot be null . |
Returns | |
---|---|
boolean |
true if this drawable actually has a padding, else false. When false is returned, the padding is always set to 0. |
hasFocusStateSpecified
public boolean hasFocusStateSpecified ()
Indicates whether this drawable has at least one state spec explicitly
specifying R.attr.state_focused
.
Note: A View uses a Drawable
instance as its background and it
changes its appearance based on a state. On keyboard devices, it should
specify its R.attr.state_focused
to make sure the user
knows which view is holding the focus.
Returns | |
---|---|
boolean |
true if R.attr.state_focused is specified
for this drawable. |
inflate
public void inflate (Resources r, XmlPullParser parser, AttributeSet attrs, Resources.Theme theme)
Inflate this Drawable from an XML resource optionally styled by a theme. This can't be called more than once for each Drawable. Note that framework may have called this once to create the Drawable instance from XML resource.
Parameters | |
---|---|
r |
Resources : This value cannot be null . |
parser |
XmlPullParser : This value cannot be null . |
attrs |
AttributeSet : This value cannot be null . |
theme |
Resources.Theme : This value may be null . |
Throws | |
---|---|
IOException |
|
XmlPullParserException |
invalidateDrawable
public void invalidateDrawable (Drawable who)
Called when the drawable needs to be redrawn. A view at this point should invalidate itself (or at least the part of itself where the drawable appears).
Parameters | |
---|---|
who |
Drawable : This value cannot be null . |
isStateful
public boolean isStateful ()
Indicates whether this drawable will change its appearance based on state. Clients can use this to determine whether it is necessary to calculate their state and call setState.
Returns | |
---|---|
boolean |
True if this drawable changes its appearance based on state, false otherwise. |
jumpToCurrentState
public void jumpToCurrentState ()
If this Drawable does transition animations between states, ask that it immediately jump to the current state and skip any active animations.
mutate
public Drawable mutate ()
Make this drawable mutable. This operation cannot be reversed. A mutable drawable is guaranteed to not share its state with any other drawable. This is especially useful when you need to modify properties of drawables loaded from resources. By default, all drawables instances loaded from the same resource share a common state; if you modify the state of one instance, all the other instances will receive the same modification. Calling this method on a mutable Drawable will have no effect.
Returns | |
---|---|
Drawable |
This value cannot be null . |
onLayoutDirectionChanged
public boolean onLayoutDirectionChanged (int layoutDirection)
Called when the drawable's resolved layout direction changes.
Parameters | |
---|---|
layoutDirection |
int : Value is View.LAYOUT_DIRECTION_LTR , or View.LAYOUT_DIRECTION_RTL |
Returns | |
---|---|
boolean |
true if the layout direction change has caused the
appearance of the drawable to change such that it needs to be
re-drawn, false otherwise |
scheduleDrawable
public void scheduleDrawable (Drawable who, Runnable what, long when)
A Drawable can call this to schedule the next frame of its
animation. An implementation can generally simply call
Handler.postAtTime(Runnable, Object, long)
with
the parameters (what, who, when) to perform the
scheduling.
Parameters | |
---|---|
who |
Drawable : This value cannot be null . |
what |
Runnable : This value cannot be null . |
when |
long : The time (in milliseconds) to run. The timebase is
SystemClock.uptimeMillis() |
setAlpha
public void setAlpha (int alpha)
Specify an alpha value for the drawable. 0 means fully transparent, and 255 means fully opaque.
Parameters | |
---|---|
alpha |
int : Value is between 0 and 255 inclusive |
setColorFilter
public void setColorFilter (ColorFilter colorFilter)
Specify an optional color filter for the drawable.
If a Drawable has a ColorFilter, each output pixel of the Drawable's drawing contents will be modified by the color filter before it is blended onto the render target of a Canvas.
Pass null
to remove any existing color filter.
Note: Setting a non-null
color
filter disables tint
.
Parameters | |
---|---|
colorFilter |
ColorFilter : This value may be null . |
setDrawable
public void setDrawable (Drawable dr)
Sets the wrapped drawable.
Parameters | |
---|---|
dr |
Drawable : the wrapped drawable
This value may be null . |
setHotspot
public void setHotspot (float x, float y)
Specifies the hotspot's location within the drawable.
Parameters | |
---|---|
x |
float : The X coordinate of the center of the hotspot |
y |
float : The Y coordinate of the center of the hotspot |
setHotspotBounds
public void setHotspotBounds (int left, int top, int right, int bottom)
Sets the bounds to which the hotspot is constrained, if they should be different from the drawable bounds.
Parameters | |
---|---|
left |
int : position in pixels of the left bound |
top |
int : position in pixels of the top bound |
right |
int : position in pixels of the right bound |
bottom |
int : position in pixels of the bottom bound |
setTintBlendMode
public void setTintBlendMode (BlendMode blendMode)
Specifies a tint blending mode for this drawable.
Defines how this drawable's tint color should be blended into the drawable
before it is drawn to screen. Default tint mode is BlendMode#SRC_IN
.
Note: Setting a color filter via
setColorFilter(android.graphics.ColorFilter)
Parameters | |
---|---|
blendMode |
BlendMode : This value cannot be null . |
setTintList
public void setTintList (ColorStateList tint)
Specifies tint color for this drawable as a color state list.
A Drawable's drawing content will be blended together with its tint
before it is drawn to the screen. This functions similarly to
setColorFilter(int, android.graphics.PorterDuff.Mode)
.
Note: Setting a color filter via
setColorFilter(android.graphics.ColorFilter)
or
setColorFilter(int, android.graphics.PorterDuff.Mode)
overrides tint.
Parameters | |
---|---|
tint |
ColorStateList : This value may be null . |
setVisible
public boolean setVisible (boolean visible, boolean restart)
Set whether this Drawable is visible. This generally does not impact the Drawable's behavior, but is a hint that can be used by some Drawables, for example, to decide whether run animations.
Parameters | |
---|---|
visible |
boolean : Set to true if visible, false if not. |
restart |
boolean : You can supply true here to force the drawable to behave
as if it has just become visible, even if it had last
been set visible. Used for example to force animations
to restart. |
Returns | |
---|---|
boolean |
boolean Returns true if the new visibility is different than its previous state. |
unscheduleDrawable
public void unscheduleDrawable (Drawable who, Runnable what)
A Drawable can call this to unschedule an action previously
scheduled with scheduleDrawable(Drawable, Runnable, long)
. An implementation can
generally simply call
Handler.removeCallbacks(Runnable, Object)
with
the parameters (what, who) to unschedule the drawable.
Parameters | |
---|---|
who |
Drawable : This value cannot be null . |
what |
Runnable : This value cannot be null . |
Protected methods
onBoundsChange
protected void onBoundsChange (Rect bounds)
Override this in your subclass to change appearance if you vary based on the bounds.
Parameters | |
---|---|
bounds |
Rect : This value cannot be null . |
onLevelChange
protected boolean onLevelChange (int level)
Override this in your subclass to change appearance if you vary based on level.
Parameters | |
---|---|
level |
int |
Returns | |
---|---|
boolean |
Returns true if the level change has caused the appearance of the Drawable to change (that is, it needs to be drawn), else false if it looks the same and there is no need to redraw it since its last level. |
onStateChange
protected boolean onStateChange (int[] state)
Override this in your subclass to change appearance if you recognize the specified state.
Parameters | |
---|---|
state |
int : This value cannot be null . |
Returns | |
---|---|
boolean |
Returns true if the state change has caused the appearance of the Drawable to change (that is, it needs to be drawn), else false if it looks the same and there is no need to redraw it since its last state. |