public
class
ColorDrawable
extends Drawable
java.lang.Object | ||
↳ | android.graphics.drawable.Drawable | |
↳ | android.graphics.drawable.ColorDrawable |
A specialized Drawable that fills the Canvas with a specified color. Note that a ColorDrawable ignores the ColorFilter.
It can be defined in an XML file with the <color>
element.
XML attributes | |
---|---|
android:color |
The color to use. |
Public constructors | |
---|---|
ColorDrawable()
Creates a new black ColorDrawable. |
|
ColorDrawable(int color)
Creates a new ColorDrawable with the specified color. |
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()
Returns the alpha value of this drawable's color. |
int
|
getChangingConfigurations()
Return a mask of the configuration parameters for which this drawable may change, requiring that it be re-created. |
int
|
getColor()
Gets the drawable's color value. |
Drawable.ConstantState
|
getConstantState()
Return a |
int
|
getOpacity()
Return the opacity/transparency of this Drawable. |
void
|
getOutline(Outline outline)
Called to get the drawable to populate the Outline that defines its drawing area. |
void
|
inflate(Resources r, XmlPullParser parser, AttributeSet attrs, Resources.Theme theme)
Inflate this Drawable from an XML resource optionally styled by a theme. |
boolean
|
isStateful()
Indicates whether this drawable will change its appearance based on state. |
Drawable
|
mutate()
A mutable BitmapDrawable still shares its Bitmap with any other Drawable that comes from the same resource. |
void
|
setAlpha(int alpha)
Sets the color's alpha value. |
void
|
setColor(int color)
Sets the drawable's color value. |
void
|
setColorFilter(ColorFilter colorFilter)
Sets the color filter applied to this color. |
void
|
setTintList(ColorStateList tint)
Specifies tint color for this drawable as a color state list. |
void
|
setTintMode(PorterDuff.Mode tintMode)
Specifies a tint blending mode for this drawable. |
Protected methods | |
---|---|
boolean
|
onStateChange(int[] stateSet)
Override this in your subclass to change appearance if you recognize the specified state. |
Inherited methods | |
---|---|
From
class
android.graphics.drawable.Drawable
| |
From
class
java.lang.Object
|
The color to use.
Must be a color value, in the form of "#rgb
", "#argb
",
"#rrggbb
", or "#aarrggbb
".
This may also be a reference to a resource (in the form
"@[package:]type:name
") or
theme attribute (in the form
"?[package:][type:]name
")
containing a value of this type.
This corresponds to the global attribute
resource symbol color
.
ColorDrawable (int color)
Creates a new ColorDrawable with the specified color.
Parameters | |
---|---|
color |
int :
The color to draw.
|
void applyTheme (Resources.Theme t)
Applies the specified theme to this Drawable and its children.
Parameters | |
---|---|
t |
Resources.Theme :
the theme to apply
|
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 :
The canvas to draw into
|
int getAlpha ()
Returns the alpha value of this drawable's color.
Returns | |
---|---|
int |
A value between 0 and 255. |
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.
Returns | |
---|---|
int |
Returns a mask of the changing configuration parameters, as
defined by ActivityInfo . |
int getColor ()
Gets the drawable's color value.
Returns | |
---|---|
int |
int The color to draw. |
Drawable.ConstantState getConstantState ()
Return a Drawable.ConstantState
instance that holds the shared state of this Drawable.
Returns | |
---|---|
Drawable.ConstantState |
The ConstantState associated to that Drawable. |
int getOpacity ()
Return the opacity/transparency of this Drawable. The returned value is
one of the abstract format constants in
PixelFormat
:
UNKNOWN
,
TRANSLUCENT
,
TRANSPARENT
, or
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. |
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
|
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 :
Resources used to resolve attribute values |
parser |
XmlPullParser :
XML parser from which to inflate this Drawable |
attrs |
AttributeSet :
Base set of attribute values |
theme |
Resources.Theme :
Theme to apply, may be null |
Throws | |
---|---|
XmlPullParserException |
|
IOException |
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. |
Drawable mutate ()
A mutable BitmapDrawable still shares its Bitmap with any other Drawable that comes from the same resource.
Returns | |
---|---|
Drawable |
This drawable. |
void setAlpha (int alpha)
Sets the color's alpha value.
Parameters | |
---|---|
alpha |
int :
The alpha value to set, between 0 and 255.
|
void setColor (int color)
Sets the drawable's color value. This action will clobber the results of
prior calls to setAlpha(int)
on this object, which side-affected
the underlying color.
Parameters | |
---|---|
color |
int :
The color to draw.
|
void setColorFilter (ColorFilter colorFilter)
Sets the color filter applied to this color.
Only supported on version LOLLIPOP
and
above. Calling this method has no effect on earlier versions.
Parameters | |
---|---|
colorFilter |
ColorFilter :
The color filter to apply, or null to remove the
existing color filter
|
See also:
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, PorterDuff.Mode)
.
Note: Setting a color filter via
setColorFilter(ColorFilter)
or
setColorFilter(int, PorterDuff.Mode)
overrides tint.
Parameters | |
---|---|
tint |
ColorStateList :
Color state list to use for tinting this drawable, or
null to clear the tint |
void setTintMode (PorterDuff.Mode tintMode)
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 SRC_IN
.
Note: Setting a color filter via
setColorFilter(ColorFilter)
or
setColorFilter(int, PorterDuff.Mode)
overrides tint.
Parameters | |
---|---|
tintMode |
PorterDuff.Mode :
A Porter-Duff blending mode |
boolean onStateChange (int[] stateSet)
Override this in your subclass to change appearance if you recognize the specified state.
Parameters | |
---|---|
stateSet |
int
|
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. |