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ColorDrawable

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.

Summary

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 Drawable.ConstantState instance that holds the shared state of this Drawable.

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

XML attributes

android:color

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.

Public constructors

ColorDrawable

Added in API level 1
ColorDrawable ()

Creates a new black ColorDrawable.

ColorDrawable

Added in API level 1
ColorDrawable (int color)

Creates a new ColorDrawable with the specified color.

Parameters
color int: The color to draw.

Public methods

applyTheme

Added in API level 21
void applyTheme (Resources.Theme t)

Applies the specified theme to this Drawable and its children.

Parameters
t Resources.Theme: the theme to apply

canApplyTheme

Added in API level 21
boolean canApplyTheme ()

Returns
boolean

draw

Added in API level 1
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

getAlpha

Added in API level 1
int getAlpha ()

Returns the alpha value of this drawable's color.

Returns
int A value between 0 and 255.

getChangingConfigurations

Added in API level 1
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.

getColor

Added in API level 11
int getColor ()

Gets the drawable's color value.

Returns
int int The color to draw.

getConstantState

Added in API level 1
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.

getOpacity

Added in API level 1
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.

getOutline

Added in API level 21
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

inflate

Added in API level 21
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

isStateful

Added in API level 1
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.

mutate

Added in API level 3
Drawable mutate ()

A mutable BitmapDrawable still shares its Bitmap with any other Drawable that comes from the same resource.

Returns
Drawable This drawable.

setAlpha

Added in API level 1
void setAlpha (int alpha)

Sets the color's alpha value.

Parameters
alpha int: The alpha value to set, between 0 and 255.

setColor

Added in API level 11
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.

setColorFilter

Added in API level 1
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:

setTintList

Added in API level 21
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

setTintMode

Added in API level 21
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

Protected methods

onStateChange

Added in API level 1
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.
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