Android APIs
public class

DrawableContainer

extends Drawable
implements Drawable.Callback
java.lang.Object
   ↳ android.graphics.drawable.Drawable
     ↳ android.graphics.drawable.DrawableContainer
Known Direct Subclasses
Known Indirect Subclasses

Class Overview

A helper class that contains several Drawables and selects which one to use. You can subclass it to create your own DrawableContainers or directly use one its child classes.

Summary

Nested Classes
class DrawableContainer.DrawableContainerState A ConstantState that can contain several Drawables. 
Public Constructors
DrawableContainer()
Public Methods
void applyTheme(Resources.Theme theme)
Applies the specified theme to this Drawable and its children.
boolean canApplyTheme()
void draw(Canvas canvas)
Draw in its bounds (set via setBounds) respecting optional effects such as alpha (set via setAlpha) and color filter (set via setColorFilter).
int getAlpha()
Gets the current alpha value for the drawable.
int getChangingConfigurations()
Return a mask of the configuration parameters for which this drawable may change, requiring that it be re-created.
Drawable.ConstantState getConstantState()
Return a Drawable.ConstantState instance that holds the shared state of this Drawable.
Drawable getCurrent()
void getHotspotBounds(Rect outRect)
Populates outRect with the hotspot bounds.
int getIntrinsicHeight()
Return the intrinsic height of the underlying drawable object.
int getIntrinsicWidth()
Return the intrinsic width of the underlying drawable object.
int getMinimumHeight()
Returns the minimum height suggested by this Drawable.
int getMinimumWidth()
Returns the minimum width suggested by this Drawable.
int getOpacity()
Return the opacity/transparency of this Drawable.
void getOutline(Outline outline)
Called to get the drawable to populate the Outline that defines its drawing area.
boolean getPadding(Rect padding)
Return in padding the insets suggested by this Drawable for placing content inside the drawable's bounds.
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.
boolean selectDrawable(int idx)
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 setEnterFadeDuration(int ms)
Change the global fade duration when a new drawable is entering the scene.
void setExitFadeDuration(int ms)
Change the global fade duration when a new drawable is leaving the scene.
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 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.
void setConstantState(DrawableContainer.DrawableContainerState state)
[Expand]
Inherited Methods
From class android.graphics.drawable.Drawable
From class java.lang.Object
From interface android.graphics.drawable.Drawable.Callback

Public Constructors

public DrawableContainer ()

Added in API level 1

Public Methods

public void applyTheme (Resources.Theme theme)

Added in API level 21

Applies the specified theme to this Drawable and its children.

Parameters
theme Resources.Theme

public boolean canApplyTheme ()

Added in API level 21

Returns
boolean

public void draw (Canvas canvas)

Added in API level 1

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

public int getAlpha ()

Added in API level 19

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

public int getChangingConfigurations ()

Added in API level 1

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.

public Drawable.ConstantState getConstantState ()

Added in API level 1

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

Returns
Drawable.ConstantState The ConstantState associated to that Drawable.

public Drawable getCurrent ()

Added in API level 1

Returns
Drawable The current drawable that will be used by this drawable. For simple drawables, this is just the drawable itself. For drawables that change state like StateListDrawable and LevelListDrawable this will be the child drawable currently in use.

public void getHotspotBounds (Rect outRect)

Added in API level 23

Populates outRect with the hotspot bounds.

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

public int getIntrinsicHeight ()

Added in API level 1

Return the intrinsic height of the underlying drawable object. Returns -1 if it has no intrinsic height, such as with a solid color.

Returns
int

public int getIntrinsicWidth ()

Added in API level 1

Return the intrinsic width of the underlying drawable object. Returns -1 if it has no intrinsic width, such as with a solid color.

Returns
int

public int getMinimumHeight ()

Added in API level 1

Returns the minimum height suggested by this Drawable. If a View uses this Drawable as a background, it is suggested that the View use at least this value for its height. (There will be some scenarios where this will not be possible.) This value should INCLUDE any padding.

Returns
int The minimum height suggested by this Drawable. If this Drawable doesn't have a suggested minimum height, 0 is returned.

public int getMinimumWidth ()

Added in API level 1

Returns the minimum width suggested by this Drawable. If a View uses this Drawable as a background, it is suggested that the View use at least this value for its width. (There will be some scenarios where this will not be possible.) This value should INCLUDE any padding.

Returns
int The minimum width suggested by this Drawable. If this Drawable doesn't have a suggested minimum width, 0 is returned.

public int getOpacity ()

Added in API level 1

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.

public void getOutline (Outline outline)

Added in API level 21

Called to get the drawable to populate the Outline that defines its drawing area.

This method is called by the default ViewOutlineProvider to define the outline of the View.

The default behavior defines the outline to be the bounding rectangle of 0 alpha. Subclasses that wish to convey a different shape or alpha value must override this method.

Parameters
outline Outline

public boolean getPadding (Rect padding)

Added in API level 1

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.

public void invalidateDrawable (Drawable who)

Added in API level 1

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.

public boolean isAutoMirrored ()

Added in API level 19

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.

public boolean isStateful ()

Added in API level 1

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.

public void jumpToCurrentState ()

Added in API level 11

If this Drawable does transition animations between states, ask that it immediately jump to the current state and skip any active animations.

public Drawable mutate ()

Added in API level 3

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.

public boolean onLayoutDirectionChanged (int layoutDirection)

Added in API level 23

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 and it needs to be re-drawn

public void scheduleDrawable (Drawable who, Runnable what, long when)

Added in API level 1

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()

public boolean selectDrawable (int idx)

Added in API level 1

Parameters
idx int
Returns
boolean

public void setAlpha (int alpha)

Added in API level 1

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

Parameters
alpha int

public void setAutoMirrored (boolean mirrored)

Added in API level 19

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.

public void setColorFilter (ColorFilter colorFilter)

Added in API level 1

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

public void setDither (boolean dither)

Added in API level 1

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

public void setEnterFadeDuration (int ms)

Added in API level 11

Change the global fade duration when a new drawable is entering the scene.

Parameters
ms int: The amount of time to fade in milliseconds.

public void setExitFadeDuration (int ms)

Added in API level 11

Change the global fade duration when a new drawable is leaving the scene.

Parameters
ms int: The amount of time to fade in milliseconds.

public void setHotspot (float x, float y)

Added in API level 21

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

public void setHotspotBounds (int left, int top, int right, int bottom)

Added in API level 21

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

public void setTintList (ColorStateList tint)

Added in API level 21

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

public void setTintMode (PorterDuff.Mode tintMode)

Added in API level 21

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

public boolean setVisible (boolean visible, boolean restart)

Added in API level 1

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.

public void unscheduleDrawable (Drawable who, Runnable what)

Added in API level 1

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

protected void onBoundsChange (Rect bounds)

Added in API level 1

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

Parameters
bounds Rect

protected boolean onLevelChange (int level)

Added in API level 1

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.

protected boolean onStateChange (int[] state)

Added in API level 1

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.

protected void setConstantState (DrawableContainer.DrawableContainerState state)

Added in API level 1

Parameters
state DrawableContainer.DrawableContainerState