public class

DrawableContainer

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

Summary

Nested Classes
public class DrawableContainer.DrawableContainerState  
Public Constructors
DrawableContainer()
Public Methods
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 getChangingConfigurations()
Return a mask of the configuration parameters for which this drawable mau change, requiring that it be re-created.
Drawable.ConstantState getConstantState()
Drawable getCurrent()
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.
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 isStateful()
Indicates whether this view will change its appearance based on state.
Drawable mutate()
Make this drawable mutable.
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 setColorFilter(ColorFilter cf)
Specify an optional colorFilter for the drawable.
void setDither(boolean dither)
Set to true to have the drawable dither its colors when drawn to a device with fewer than 8-bits per color component.
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 recognize the specified state.
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 ()

Public Methods

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 The canvas to draw into

public int getChangingConfigurations ()

Return a mask of the configuration parameters for which this drawable mau 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
  • Returns a mask of the changing configuration parameters, as defined by Configuration.

public Drawable.ConstantState getConstantState ()

public Drawable getCurrent ()

Returns
  • 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 int getIntrinsicHeight ()

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

public int getIntrinsicWidth ()

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

public int getMinimumHeight ()

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

public int getMinimumWidth ()

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

public 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.

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 take into account a custom alpha or color filter that has been applied by the client through the setAlpha(int) or setColorFilter(ColorFilter) methods.

Returns
  • int The opacity class of the Drawable.

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). Returns 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)

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 The drawable that is requesting the update.

public boolean isStateful ()

Indicates whether this view 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
  • True if this view changes its appearance based on state, false otherwise.

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
  • This drawable.

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 postAtTime(Runnable, Object, long) with the parameters (what, who, when) to perform the scheduling.

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

public boolean selectDrawable (int idx)

public void setAlpha (int alpha)

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

public void setColorFilter (ColorFilter cf)

Specify an optional colorFilter for the drawable. Pass null to remove any filters.

public void setDither (boolean dither)

Set to true to have the drawable dither its colors when drawn to a device with fewer than 8-bits per color component. This can improve the look on those devices, but can also slow down the drawing a little.

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 Set to true if visible, false if not.
restart 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 Returns true if the new visibility is different than its previous state.

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 removeCallbacks(Runnable, Object) with the parameters (what, who) to unschedule the drawable.

Parameters
who The drawable being unscheduled.
what The action being unscheduled.

Protected Methods

protected void onBoundsChange (Rect bounds)

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

protected boolean onLevelChange (int level)

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

Returns
  • 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)

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

Returns
  • 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)