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Added in API level 1
Summary: XML Attrs | Constants | Ctors | Methods | Protected Methods | Inherited Methods | [Expand All]

LayerDrawable

public class LayerDrawable
extends Drawable implements Drawable.Callback

java.lang.Object
   ↳ android.graphics.drawable.Drawable
     ↳ android.graphics.drawable.LayerDrawable
Known Direct Subclasses

A Drawable that manages an array of other Drawables. These are drawn in array order, so the element with the largest index will be drawn on top.

It can be defined in an XML file with the <layer-list> element. Each Drawable in the layer is defined in a nested <item>.

For more information, see the guide to Drawable Resources.

Summary

XML attributes

android:bottom Bottom inset to apply to the layer. 
android:drawable Drawable used to render the layer. 
android:end End inset to apply to the layer. 
android:gravity Gravity used to align the layer within its container. 
android:height Height of the layer. 
android:id Identifier of the layer. 
android:left Left inset to apply to the layer. 
android:paddingBottom Explicit bottom padding. 
android:paddingEnd Explicit end padding. 
android:paddingLeft Explicit left padding. 
android:paddingMode Indicates how layer padding should affect the bounds of subsequent layers. 
android:paddingRight Explicit right padding. 
android:paddingStart Explicit start padding. 
android:paddingTop Explicit top padding. 
android:right Right inset to apply to the layer. 
android:start Start inset to apply to the layer. 
android:top Top inset to apply to the layer. 
android:width Width of the layer. 

Constants

int INSET_UNDEFINED

Value used for undefined start and end insets.

int PADDING_MODE_NEST

Padding mode used to nest each layer inside the padding of the previous layer.

int PADDING_MODE_STACK

Padding mode used to stack each layer directly atop the previous layer.

Public constructors

LayerDrawable(Drawable[] layers)

Creates a new layer drawable with the list of specified layers.

Public methods

int addLayer(Drawable dr)

Adds a new layer containing the specified drawable to the end of the layer list and returns its index.

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).

Drawable findDrawableByLayerId(int id)

Looks for a layer with the given ID and returns its Drawable.

int findIndexByLayerId(int id)

Returns the layer with the specified id.

int getAlpha()

Gets the current alpha value for the drawable.

int getBottomPadding()

Returns the bottom padding in pixels.

int getChangingConfigurations()

Return a mask of the configuration parameters for which this drawable may change, requiring that it be re-created.

Drawable.ConstantState getConstantState()

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

Drawable getDrawable(int index)

Returns the drawable for the layer at the specified index.

int getEndPadding()

Returns the end padding in pixels.

void getHotspotBounds(Rect outRect)

Populates outRect with the hotspot bounds.

int getId(int index)

Returns the ID of the specified layer.

int getIntrinsicHeight()

Returns the drawable's intrinsic height.

int getIntrinsicWidth()

Returns the drawable's intrinsic width.

int getLayerGravity(int index)
int getLayerHeight(int index)
int getLayerInsetBottom(int index)
int getLayerInsetEnd(int index)
int getLayerInsetLeft(int index)
int getLayerInsetRight(int index)
int getLayerInsetStart(int index)
int getLayerInsetTop(int index)
int getLayerWidth(int index)
int getLeftPadding()

Returns the left padding in pixels.

int getNumberOfLayers()

Returns the number of layers contained within this layer drawable.

int getOpacity()

Return the opacity/transparency of this Drawable.

void getOutline(Outline outline)

Populates outline with the first available (non-empty) layer outline.

boolean getPadding(Rect padding)

Return in padding the insets suggested by this Drawable for placing content inside the drawable's bounds.

int getPaddingMode()
int getRightPadding()

Returns the right padding in pixels.

int getStartPadding()

Returns the start padding in pixels.

int getTopPadding()

Returns the top padding in pixels.

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 isAutoMirrored()

Tells if this Drawable will be automatically mirrored when its layout direction is RTL right-to-left.

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 setAutoMirrored(boolean mirrored)

Set whether this Drawable is automatically mirrored when its layout direction is RTL (right-to left).

void setColorFilter(ColorFilter colorFilter)

Specify an optional color filter for the drawable.

void setDither(boolean dither)

This method is deprecated. This property is ignored.

void setDrawable(int index, Drawable drawable)

Sets the drawable for the layer at the specified index.

boolean setDrawableByLayerId(int id, Drawable drawable)

Replaces the Drawable for the layer with the given id.

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 setId(int index, int id)

Sets the ID of a layer.

void setLayerGravity(int index, int gravity)

Sets the gravity used to position or stretch the specified layer within its container.

void setLayerHeight(int index, int h)
void setLayerInset(int index, int l, int t, int r, int b)

Specifies the insets in pixels for the drawable at the specified index.

void setLayerInsetBottom(int index, int b)
void setLayerInsetEnd(int index, int e)
void setLayerInsetLeft(int index, int l)
void setLayerInsetRelative(int index, int s, int t, int e, int b)

Specifies the relative insets in pixels for the drawable at the specified index.

void setLayerInsetRight(int index, int r)
void setLayerInsetStart(int index, int s)
void setLayerInsetTop(int index, int t)
void setLayerSize(int index, int w, int h)

Sets an explicit size for the specified layer.

void setLayerWidth(int index, int w)
void setOpacity(int opacity)

Sets the opacity of this drawable directly instead of collecting the states from the layers.

void setPadding(int left, int top, int right, int bottom)

Sets the absolute padding.

void setPaddingMode(int mode)

Specifies how layer padding should affect the bounds of subsequent layers.

void setPaddingRelative(int start, int top, int end, int bottom)

Sets the relative padding.

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.

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 scheduleDrawable(Drawable, Runnable, long).

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

From class android.graphics.drawable.Drawable
From class java.lang.Object
From interface android.graphics.drawable.Drawable.Callback

XML attributes

android:bottom

Bottom inset to apply to the layer.

Must be a dimension value, which is a floating point number appended with a unit such as "14.5sp". Available units are: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size), in (inches), mm (millimeters).

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 bottom.

Related methods:

android:drawable

Drawable used to render the layer.

Must be a reference to another resource, in the form "@[+][package:]type:name" or to a theme attribute in the form "?[package:][type:]name".

This corresponds to the global attribute resource symbol drawable.

Related methods:

android:end

End inset to apply to the layer. Overrides left or right depending on layout direction.

Must be a dimension value, which is a floating point number appended with a unit such as "14.5sp". Available units are: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size), in (inches), mm (millimeters).

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 end.

Related methods:

android:gravity

Gravity used to align the layer within its container. If no value is specified, the default behavior depends on whether an explicit width or height has been set, If no dimension is set, gravity in that direction defaults to fill_horizontal or fill_vertical; otherwise, it defaults to left or top.

Must be one or more (separated by '|') of the following constant values.

ConstantValueDescription
top0x30 Push object to the top of its container, not changing its size.
bottom0x50 Push object to the bottom of its container, not changing its size.
left0x03 Push object to the left of its container, not changing its size.
right0x05 Push object to the right of its container, not changing its size.
center_vertical0x10 Place object in the vertical center of its container, not changing its size.
fill_vertical0x70 Grow the vertical size of the object if needed so it completely fills its container.
center_horizontal0x01 Place object in the horizontal center of its container, not changing its size.
fill_horizontal0x07 Grow the horizontal size of the object if needed so it completely fills its container.
center0x11 Place the object in the center of its container in both the vertical and horizontal axis, not changing its size.
fill0x77 Grow the horizontal and vertical size of the object if needed so it completely fills its container.
clip_vertical0x80 Additional option that can be set to have the top and/or bottom edges of the child clipped to its container's bounds. The clip will be based on the vertical gravity: a top gravity will clip the bottom edge, a bottom gravity will clip the top edge, and neither will clip both edges.
clip_horizontal0x08 Additional option that can be set to have the left and/or right edges of the child clipped to its container's bounds. The clip will be based on the horizontal gravity: a left gravity will clip the right edge, a right gravity will clip the left edge, and neither will clip both edges.
start0x00800003 Push object to the beginning of its container, not changing its size.
end0x00800005 Push object to the end of its container, not changing its size.

This corresponds to the global attribute resource symbol gravity.

Related methods:

android:height

Height of the layer. Defaults to the layer's intrinsic height

Must be a dimension value, which is a floating point number appended with a unit such as "14.5sp". Available units are: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size), in (inches), mm (millimeters).

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 height.

Related methods:

android:id

Identifier of the layer. This can be used to retrieve the layer from a drawable container.

Must be a reference to another resource, in the form "@[+][package:]type:name" or to a theme attribute in the form "?[package:][type:]name".

This corresponds to the global attribute resource symbol id.

Related methods:

android:left

Left inset to apply to the layer.

Must be a dimension value, which is a floating point number appended with a unit such as "14.5sp". Available units are: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size), in (inches), mm (millimeters).

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 left.

Related methods:

android:paddingBottom

Explicit bottom padding. Overrides child padding.

Must be a dimension value, which is a floating point number appended with a unit such as "14.5sp". Available units are: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size), in (inches), mm (millimeters).

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 paddingBottom.

Related methods:

android:paddingEnd

Explicit end padding. Overrides child padding. Takes precedence over absolute padding (e.g. right when layout direction is LTR).

Must be a dimension value, which is a floating point number appended with a unit such as "14.5sp". Available units are: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size), in (inches), mm (millimeters).

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 paddingEnd.

Related methods:

android:paddingLeft

Explicit left padding. Overrides child padding.

Must be a dimension value, which is a floating point number appended with a unit such as "14.5sp". Available units are: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size), in (inches), mm (millimeters).

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 paddingLeft.

Related methods:

android:paddingMode

Indicates how layer padding should affect the bounds of subsequent layers. The default padding mode value is nest.

Must be one of the following constant values.

ConstantValueDescription
nest0 Nest each layer inside the padding of the previous layer.
stack1 Stack each layer directly atop the previous layer.

This corresponds to the global attribute resource symbol paddingMode.

Related methods:

android:paddingRight

Explicit right padding. Overrides child padding.

Must be a dimension value, which is a floating point number appended with a unit such as "14.5sp". Available units are: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size), in (inches), mm (millimeters).

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 paddingRight.

Related methods:

android:paddingStart

Explicit start padding. Overrides child padding. Takes precedence over absolute padding (e.g. left when layout direction is LTR).

Must be a dimension value, which is a floating point number appended with a unit such as "14.5sp". Available units are: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size), in (inches), mm (millimeters).

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 paddingStart.

Related methods:

android:paddingTop

Explicit top padding. Overrides child padding.

Must be a dimension value, which is a floating point number appended with a unit such as "14.5sp". Available units are: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size), in (inches), mm (millimeters).

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 paddingTop.

Related methods:

android:right

Right inset to apply to the layer.

Must be a dimension value, which is a floating point number appended with a unit such as "14.5sp". Available units are: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size), in (inches), mm (millimeters).

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 right.

Related methods:

android:start

Start inset to apply to the layer. Overrides left or right depending on layout direction.

Must be a dimension value, which is a floating point number appended with a unit such as "14.5sp". Available units are: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size), in (inches), mm (millimeters).

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 start.

Related methods:

android:top

Top inset to apply to the layer.

Must be a dimension value, which is a floating point number appended with a unit such as "14.5sp". Available units are: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size), in (inches), mm (millimeters).

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 top.

Related methods:

android:width

Width of the layer. Defaults to the layer's intrinsic width.

Must be a dimension value, which is a floating point number appended with a unit such as "14.5sp". Available units are: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size), in (inches), mm (millimeters).

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 width.

Related methods:

Constants

INSET_UNDEFINED

Added in API level 24 
int INSET_UNDEFINED

Value used for undefined start and end insets.

See also:

Constant Value: -2147483648 (0x80000000)

PADDING_MODE_NEST

Added in API level 21 
int PADDING_MODE_NEST

Padding mode used to nest each layer inside the padding of the previous layer.

See also:

Constant Value: 0 (0x00000000)

PADDING_MODE_STACK

Added in API level 21 
int PADDING_MODE_STACK

Padding mode used to stack each layer directly atop the previous layer.

See also:

Constant Value: 1 (0x00000001)

Public constructors

LayerDrawable

Added in API level 1
LayerDrawable (Drawable[] layers)

Creates a new layer drawable with the list of specified layers.

Parameters
layers Drawable: a list of drawables to use as layers in this new drawable, must be non-null

Public methods

addLayer

Added in API level 23
int addLayer (Drawable dr)

Adds a new layer containing the specified drawable to the end of the layer list and returns its index.

Parameters
dr Drawable: The drawable to add as a new layer.
Returns
int The index of the new layer.

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

findDrawableByLayerId

Added in API level 1
Drawable findDrawableByLayerId (int id)

Looks for a layer with the given ID and returns its Drawable.

If multiple layers are found for the given ID, returns the Drawable for the matching layer at the highest index.

Parameters
id int: The layer ID to search for.
Returns
Drawable The Drawable for the highest-indexed layer that has the given ID, or null if not found.

findIndexByLayerId

Added in API level 23
int findIndexByLayerId (int id)

Returns the layer with the specified id.

If multiple layers have the same ID, returns the layer with the lowest index.

Parameters
id int: The ID of the layer to return.
Returns
int The index of the layer with the specified ID.

getAlpha

Added in API level 19
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

getBottomPadding

Added in API level 23
int getBottomPadding ()

Returns the bottom padding in pixels.

A return value of -1 means there is no explicit padding set for this dimension. As a result, the value for this dimension returned by getPadding(Rect) will be computed from the child layers according to the padding mode (see getPaddingMode().

Returns
int the bottom padding in pixels, or -1 if not explicitly specified

See also:

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.

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.

getDrawable

Added in API level 1
Drawable getDrawable (int index)

Returns the drawable for the layer at the specified index.

Related XML Attributes:

Parameters
index int: The index of the layer, must be in the range 0...getNumberOfLayers()-1.
Returns
Drawable The Drawable at the specified layer index.

See also:

getEndPadding

Added in API level 23
int getEndPadding ()

Returns the end padding in pixels.

A return value of -1 means there is no explicit padding set for this dimension. As a result, the value for this dimension returned by getPadding(Rect) will be computed from the child layers according to the padding mode (see getPaddingMode().

Returns
int the end padding in pixels, or -1 if not explicitly specified

See also:

getHotspotBounds

Added in API level 23
void getHotspotBounds (Rect outRect)

Populates outRect with the hotspot bounds.

Parameters
outRect Rect: the rect to populate with the hotspot bounds

getId

Added in API level 1
int getId (int index)

Returns the ID of the specified layer.

Related XML Attributes:

Parameters
index int: The index of the layer, must be in the range 0...getNumberOfLayers()-1.
Returns
int The id of the layer or NO_ID if the layer has no id.

See also:

getIntrinsicHeight

Added in API level 1
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

Added in API level 1
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

getLayerGravity

Added in API level 23
int getLayerGravity (int index)

Related XML Attributes:

Parameters
index int: the index of the layer
Returns
int the gravity used to position or stretch the specified layer within its container

See also:

getLayerHeight

Added in API level 23
int getLayerHeight (int index)

Related XML Attributes:

Parameters
index int: the index of the drawable to adjust
Returns
int the explicit height of the layer, or -1 if not specified

See also:

getLayerInsetBottom

Added in API level 23
int getLayerInsetBottom (int index)

Related XML Attributes:

Parameters
index int: the index of the layer
Returns
int number of pixels to inset from the bottom bound

getLayerInsetEnd

Added in API level 23
int getLayerInsetEnd (int index)

Related XML Attributes:

Parameters
index int: the index of the layer
Returns
int number of pixels to inset from the end bound

getLayerInsetLeft

Added in API level 23
int getLayerInsetLeft (int index)

Related XML Attributes:

Parameters
index int: the index of the layer
Returns
int number of pixels to inset from the left bound

getLayerInsetRight

Added in API level 23
int getLayerInsetRight (int index)

Related XML Attributes:

Parameters
index int: the index of the layer
Returns
int number of pixels to inset from the right bound

getLayerInsetStart

Added in API level 23
int getLayerInsetStart (int index)

Related XML Attributes:

Parameters
index int: the index of the layer
Returns
int the number of pixels to inset from the start bound, or INSET_UNDEFINED if not specified

getLayerInsetTop

Added in API level 23
int getLayerInsetTop (int index)

Related XML Attributes:

Parameters
index int: the index of the layer
Returns
int number of pixels to inset from the top bound

getLayerWidth

Added in API level 23
int getLayerWidth (int index)

Related XML Attributes:

Parameters
index int: the index of the drawable to adjust
Returns
int the explicit width of the layer, or -1 if not specified

See also:

getLeftPadding

Added in API level 23
int getLeftPadding ()

Returns the left padding in pixels.

A return value of -1 means there is no explicit padding set for this dimension. As a result, the value for this dimension returned by getPadding(Rect) will be computed from the child layers according to the padding mode (see getPaddingMode().

Returns
int the left padding in pixels, or -1 if not explicitly specified

See also:

getNumberOfLayers

Added in API level 1
int getNumberOfLayers ()

Returns the number of layers contained within this layer drawable.

Returns
int The number of layers.

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)

Populates outline with the first available (non-empty) layer outline.

Parameters
outline Outline: Outline in which to place the first available layer outline

getPadding

Added in API level 1
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
Returns
boolean true if this drawable actually has a padding, else false. When false is returned, the padding is always set to 0.

getPaddingMode

Added in API level 21
int getPaddingMode ()

Related XML Attributes:

Returns
int the current padding mode

See also:

getRightPadding

Added in API level 23
int getRightPadding ()

Returns the right padding in pixels.

A return value of -1 means there is no explicit padding set for this dimension. As a result, the value for this dimension returned by getPadding(Rect) will be computed from the child layers according to the padding mode (see getPaddingMode().

Returns
int the right padding in pixels, or -1 if not explicitly specified

See also:

getStartPadding

Added in API level 23
int getStartPadding ()

Returns the start padding in pixels.

A return value of -1 means there is no explicit padding set for this dimension. As a result, the value for this dimension returned by getPadding(Rect) will be computed from the child layers according to the padding mode (see getPaddingMode().

Returns
int the start padding in pixels, or -1 if not explicitly specified

See also:

getTopPadding

Added in API level 23
int getTopPadding ()

Returns the top padding in pixels.

A return value of -1 means there is no explicit padding set for this dimension. As a result, the value for this dimension returned by getPadding(Rect) will be computed from the child layers according to the padding mode (see getPaddingMode().

Returns
int the top padding in pixels, or -1 if not explicitly specified

See also:

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

invalidateDrawable

Added in API level 1
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: The drawable that is requesting the update.

isAutoMirrored

Added in API level 19
boolean isAutoMirrored ()

Tells if this Drawable will be automatically mirrored when its layout direction is RTL right-to-left. See LayoutDirection.

Returns
boolean boolean Returns true if this Drawable will be automatically mirrored.

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.

jumpToCurrentState

Added in API level 11
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

Added in API level 3
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 drawable.

onLayoutDirectionChanged

Added in API level 23
boolean onLayoutDirectionChanged (int layoutDirection)

Called when the drawable's resolved layout direction changes.

Parameters
layoutDirection int: the new resolved layout direction
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

Added in API level 1
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 postAtTime(Runnable, Object, long) with the parameters (what, who, when) to perform the scheduling.

Parameters
who Drawable: The drawable being scheduled.
what Runnable: The action to execute.
when long: The time (in milliseconds) to run. The timebase is uptimeMillis()

setAlpha

Added in API level 1
void setAlpha (int alpha)

Specify an alpha value for the drawable. 0 means fully transparent, and 255 means fully opaque.

Parameters
alpha int

setAutoMirrored

Added in API level 19
void setAutoMirrored (boolean mirrored)

Set whether this Drawable is automatically mirrored when its layout direction is RTL (right-to left). See LayoutDirection.

Parameters
mirrored boolean: Set to true if the Drawable should be mirrored, false if not.

setColorFilter

Added in API level 1
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: The color filter to apply, or null to remove the existing color filter

setDither

Added in API level 1
void setDither (boolean dither)

This method is deprecated.
This property is ignored.

Set to true to have the drawable dither its colors when drawn to a device with fewer than 8-bits per color component.

Parameters
dither boolean

setDrawable

Added in API level 23
void setDrawable (int index, 
                Drawable drawable)

Sets the drawable for the layer at the specified index.

Related XML Attributes:

Parameters
index int: The index of the layer to modify, must be in the range 0...getNumberOfLayers()-1.
drawable Drawable: The drawable to set for the layer.

See also:

setDrawableByLayerId

Added in API level 1
boolean setDrawableByLayerId (int id, 
                Drawable drawable)

Replaces the Drawable for the layer with the given id.

Parameters
id int: The layer ID to search for.
drawable Drawable: The replacement Drawable.
Returns
boolean Whether the Drawable was replaced (could return false if the id was not found).

setHotspot

Added in API level 21
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

Added in API level 21
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

setId

Added in API level 1
void setId (int index, 
                int id)

Sets the ID of a layer.

Related XML Attributes:

Parameters
index int: The index of the layer to modify, must be in the range 0...getNumberOfLayers()-1.
id int: The id to assign to the layer.

See also:

setLayerGravity

Added in API level 23
void setLayerGravity (int index, 
                int gravity)

Sets the gravity used to position or stretch the specified layer within its container. Gravity is applied after any layer insets (see setLayerInset(int, int, int, int, int)) or padding (see setPaddingMode(int)).

If gravity is specified as NO_GRAVITY, the default behavior depends on whether an explicit width or height has been set (see setLayerSize(int, int, int)), If a dimension is not set, gravity in that direction defaults to FILL_HORIZONTAL or FILL_VERTICAL; otherwise, gravity in that direction defaults to LEFT or TOP.

Related XML Attributes:

Parameters
index int: the index of the drawable to adjust
gravity int: the gravity to set for the layer

See also:

setLayerHeight

Added in API level 23
void setLayerHeight (int index, 
                int h)

Related XML Attributes:

Parameters
index int: the index of the layer to adjust
h int: height in pixels, or -1 to use the intrinsic height

setLayerInset

Added in API level 1
void setLayerInset (int index, 
                int l, 
                int t, 
                int r, 
                int b)

Specifies the insets in pixels for the drawable at the specified index.

Related XML Attributes:

Parameters
index int: the index of the drawable to adjust
l int: number of pixels to add to the left bound
t int: number of pixels to add to the top bound
r int: number of pixels to subtract from the right bound
b int: number of pixels to subtract from the bottom bound

setLayerInsetBottom

Added in API level 23
void setLayerInsetBottom (int index, 
                int b)

Related XML Attributes:

Parameters
index int: the index of the layer to adjust
b int: number of pixels to inset from the bottom bound

setLayerInsetEnd

Added in API level 23
void setLayerInsetEnd (int index, 
                int e)

Related XML Attributes:

Parameters
index int: the index of the layer to adjust
e int: number of pixels to inset from the end bound, or INSET_UNDEFINED if not specified

setLayerInsetLeft

Added in API level 23
void setLayerInsetLeft (int index, 
                int l)

Related XML Attributes:

Parameters
index int: the index of the layer to adjust
l int: number of pixels to inset from the left bound

setLayerInsetRelative

Added in API level 23
void setLayerInsetRelative (int index, 
                int s, 
                int t, 
                int e, 
                int b)

Specifies the relative insets in pixels for the drawable at the specified index.

Related XML Attributes:

Parameters
index int: the index of the layer to adjust
s int: number of pixels to inset from the start bound
t int: number of pixels to inset from the top bound
e int: number of pixels to inset from the end bound
b int: number of pixels to inset from the bottom bound

setLayerInsetRight

Added in API level 23
void setLayerInsetRight (int index, 
                int r)

Related XML Attributes:

Parameters
index int: the index of the layer to adjust
r int: number of pixels to inset from the right bound

setLayerInsetStart

Added in API level 23
void setLayerInsetStart (int index, 
                int s)

Related XML Attributes:

Parameters
index int: the index of the layer to adjust
s int: number of pixels to inset from the start bound

setLayerInsetTop

Added in API level 23
void setLayerInsetTop (int index, 
                int t)

Related XML Attributes:

Parameters
index int: the index of the layer to adjust
t int: number of pixels to inset from the top bound

setLayerSize

Added in API level 23
void setLayerSize (int index, 
                int w, 
                int h)

Sets an explicit size for the specified layer.

Note: Setting an explicit layer size changes the default layer gravity behavior. See setLayerGravity(int, int) for more information.

Related XML Attributes:

Parameters
index int: the index of the layer to adjust
w int: width in pixels, or -1 to use the intrinsic width
h int: height in pixels, or -1 to use the intrinsic height

See also:

setLayerWidth

Added in API level 23
void setLayerWidth (int index, 
                int w)

Related XML Attributes:

Parameters
index int: the index of the layer to adjust
w int: width in pixels, or -1 to use the intrinsic width

setOpacity

Added in API level 11
void setOpacity (int opacity)

Sets the opacity of this drawable directly instead of collecting the states from the layers.

Parameters
opacity int: The opacity to use, or PixelFormat.UNKNOWN for the default behavior

See also:

setPadding

Added in API level 23
void setPadding (int left, 
                int top, 
                int right, 
                int bottom)

Sets the absolute padding.

If padding in a dimension is specified as -1, the resolved padding will use the value computed according to the padding mode (see setPaddingMode(int)).

Calling this method clears any relative padding values previously set using setPaddingRelative(int, int, int, int).

Related XML Attributes:

Parameters
left int: the left padding in pixels, or -1 to use computed padding
top int: the top padding in pixels, or -1 to use computed padding
right int: the right padding in pixels, or -1 to use computed padding
bottom int: the bottom padding in pixels, or -1 to use computed padding

See also:

setPaddingMode

Added in API level 21
void setPaddingMode (int mode)

Specifies how layer padding should affect the bounds of subsequent layers. The default value is PADDING_MODE_NEST.

Related XML Attributes:

Parameters
mode int: padding mode, one of:

See also:

setPaddingRelative

Added in API level 23
void setPaddingRelative (int start, 
                int top, 
                int end, 
                int bottom)

Sets the relative padding.

If padding in a dimension is specified as -1, the resolved padding will use the value computed according to the padding mode (see setPaddingMode(int)).

Calling this method clears any absolute padding values previously set using setPadding(int, int, int, int).

Related XML Attributes:

Parameters
start int: the start padding in pixels, or -1 to use computed padding
top int: the top padding in pixels, or -1 to use computed padding
end int: the end padding in pixels, or -1 to use computed padding
bottom int: the bottom padding in pixels, or -1 to use computed padding

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

setVisible

Added in API level 1
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

Added in API level 1
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 removeCallbacks(Runnable, Object) with the parameters (what, who) to unschedule the drawable.

Parameters
who Drawable: The drawable being unscheduled.
what Runnable: The action being unscheduled.

Protected methods

onBoundsChange

Added in API level 1
void onBoundsChange (Rect bounds)

Override this in your subclass to change appearance if you vary based on the bounds.

Parameters
bounds Rect

onLevelChange

Added in API level 1
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

Added in API level 1
boolean onStateChange (int[] state)

Override this in your subclass to change appearance if you recognize the specified state.

Parameters
state 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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