LayerDrawable


public class LayerDrawable
extends Drawable implements Drawable.Callback

java.lang.Object
   ↳ android.graphics.drawable.Drawable
     ↳ android.graphics.drawable.LayerDrawable


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 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()

This method is deprecated. This method is no longer used in graphics optimizations

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.

boolean hasFocusStateSpecified()

Indicates whether this drawable has at least one state spec explicitly specifying R.attr.state_focused.

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 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 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

XML attributes

android:bottom

Bottom inset to apply to the layer.

May 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), and mm (millimeters).

Related methods:

android:drawable

Drawable used to render the layer.

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

Related methods:

android:end

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

May 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), and mm (millimeters).

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
bottom50Push object to the bottom of its container, not changing its size.
center11Place the object in the center of its container in both the vertical and horizontal axis, not changing its size.
center_horizontal1Place object in the horizontal center of its container, not changing its size.
center_vertical10Place object in the vertical center of its container, not changing its size.
clip_horizontal8Additional 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.
clip_vertical80Additional 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.
end800005Push object to the end of its container, not changing its size.
fill77Grow the horizontal and vertical size of the object if needed so it completely fills its container.
fill_horizontal7Grow the horizontal size of the object if needed so it completely fills its container.
fill_vertical70Grow the vertical size of the object if needed so it completely fills its container.
left3Push object to the left of its container, not changing its size.
right5Push object to the right of its container, not changing its size.
start800003Push object to the beginning of its container, not changing its size.
top30Push object to the top of its container, not changing its size.

Related methods:

android:height

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

May 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), and mm (millimeters).

Related methods:

android:id

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

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

Related methods:

android:left

Left inset to apply to the layer.

May 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), and mm (millimeters).

Related methods:

android:paddingBottom

Explicit bottom padding. Overrides child padding.

May 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), and mm (millimeters).

Related methods:

android:paddingEnd

Explicit end padding. Overrides child padding. Takes precedence over absolute padding (for example, right when layout direction is LTR).

May 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), and mm (millimeters).

Related methods:

android:paddingLeft

Explicit left padding. Overrides child padding.

May 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), and mm (millimeters).

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
nest0Nest each layer inside the padding of the previous layer.
stack1Stack each layer directly atop the previous layer.

Related methods:

android:paddingRight

Explicit right padding. Overrides child padding.

May 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), and mm (millimeters).

Related methods:

android:paddingStart

Explicit start padding. Overrides child padding. Takes precedence over absolute padding (for example, left when layout direction is LTR).

May 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), and mm (millimeters).

Related methods:

android:paddingTop

Explicit top padding. Overrides child padding.

May 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), and mm (millimeters).

Related methods:

android:right

Right inset to apply to the layer.

May 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), and mm (millimeters).

Related methods:

android:start

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

May 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), and mm (millimeters).

Related methods:

android:top

Top inset to apply to the layer.

May 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), and mm (millimeters).

Related methods:

android:width

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

May 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), and mm (millimeters).

Related methods:

Constants

INSET_UNDEFINED

Added in API level 24
public static final int INSET_UNDEFINED

Value used for undefined start and end insets.

Constant Value: -2147483648 (0x80000000)

PADDING_MODE_NEST

Added in API level 21
public static final int PADDING_MODE_NEST

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

Constant Value: 0 (0x00000000)

PADDING_MODE_STACK

Added in API level 21
public static final int PADDING_MODE_STACK

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

Constant Value: 1 (0x00000001)

Public constructors

LayerDrawable

Added in API level 1
public 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
public 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
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.

canApplyTheme

Added in API level 21
public boolean canApplyTheme ()

Returns
boolean

draw

Added in API level 1
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: The canvas to draw into This value cannot be null.

findDrawableByLayerId

Added in API level 1
public 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
public 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
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

getBottomPadding

Added in API level 23
public 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(android.graphics.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

getChangingConfigurations

Added in API level 1
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.

Returns
int Value is either 0 or a combination of ActivityInfo.CONFIG_MCC, ActivityInfo.CONFIG_MNC, ActivityInfo.CONFIG_LOCALE, ActivityInfo.CONFIG_TOUCHSCREEN, ActivityInfo.CONFIG_KEYBOARD, ActivityInfo.CONFIG_KEYBOARD_HIDDEN, ActivityInfo.CONFIG_NAVIGATION, ActivityInfo.CONFIG_ORIENTATION, ActivityInfo.CONFIG_SCREEN_LAYOUT, ActivityInfo.CONFIG_UI_MODE, ActivityInfo.CONFIG_SCREEN_SIZE, ActivityInfo.CONFIG_SMALLEST_SCREEN_SIZE, ActivityInfo.CONFIG_DENSITY, ActivityInfo.CONFIG_LAYOUT_DIRECTION, ActivityInfo.CONFIG_COLOR_MODE, ActivityInfo.CONFIG_FONT_SCALE, and ActivityInfo.CONFIG_GRAMMATICAL_GENDER

getConstantState

Added in API level 1
public Drawable.ConstantState getConstantState ()

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

Returns
Drawable.ConstantState The ConstantState associated to that Drawable. This value may be null.

getDrawable

Added in API level 1
public 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.

getEndPadding

Added in API level 23
public 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(android.graphics.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

getHotspotBounds

Added in API level 23
public void getHotspotBounds (Rect outRect)

Populates outRect with the hotspot bounds.

Parameters
outRect Rect: the rect to populate with the hotspot bounds This value cannot be null.

getId

Added in API level 1
public 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 View.NO_ID if the layer has no id.

See also:

getIntrinsicHeight

Added in API level 1
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

Added in API level 1
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

getLayerGravity

Added in API level 23
public 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

getLayerHeight

Added in API level 23
public 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

getLayerInsetBottom

Added in API level 23
public 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
public 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
public 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
public 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
public 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
public 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
public 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

getLeftPadding

Added in API level 23
public 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(android.graphics.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

getNumberOfLayers

Added in API level 1
public int getNumberOfLayers ()

Returns the number of layers contained within this layer drawable.

Returns
int The number of layers.

getOpacity

Added in API level 1
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

getOutline

Added in API level 21
public 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 This value cannot be null.

getPadding

Added in API level 1
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.

getPaddingMode

Added in API level 21
public int getPaddingMode ()

Related XML Attributes:

Returns
int the current padding mode

getRightPadding

Added in API level 23
public 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(android.graphics.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

getStartPadding

Added in API level 23
public 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(android.graphics.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

getTopPadding

Added in API level 23
public 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(android.graphics.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

hasFocusStateSpecified

Added in API level 31
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

Added in API level 21
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

Added in API level 1
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.

isAutoMirrored

Added in API level 19
public 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
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

Added in API level 11
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

Added in API level 3
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 drawable. This value cannot be null.

onLayoutDirectionChanged

Added in API level 23
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

Added in API level 1
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

Added in API level 1
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

setAutoMirrored

Added in API level 19
public 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
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: The color filter to apply, or null to remove the existing color filter

setDither

Added in API level 1
public 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
public 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
public 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
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

Added in API level 21
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

setId

Added in API level 1
public 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
public 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 Gravity#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 Gravity#FILL_HORIZONTAL or Gravity#FILL_VERTICAL; otherwise, gravity in that direction defaults to Gravity#LEFT or Gravity#TOP.

Related XML Attributes:

Parameters
index int: the index of the drawable to adjust

gravity int: the gravity to set for the layer

setLayerHeight

Added in API level 23
public 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
public 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
public 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
public 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
public 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
public 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
public 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
public 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
public 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
public 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

setLayerWidth

Added in API level 23
public 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
public 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

setPadding

Added in API level 23
public 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

setPaddingMode

Added in API level 21
public 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
public 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

setTintBlendMode

Added in API level 29
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

Added in API level 21
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: Color state list to use for tinting this drawable, or null to clear the tint

setVisible

Added in API level 1
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

Added in API level 1
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

Added in API level 1
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

Added in API level 1
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

Added in API level 1
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.