Android APIs
public class

RotateDrawable

extends Drawable
implements Drawable.Callback
java.lang.Object
   ↳ android.graphics.drawable.Drawable
     ↳ android.graphics.drawable.RotateDrawable

Class Overview

A Drawable that can rotate another Drawable based on the current level value. The start and end angles of rotation can be controlled to map any circular arc to the level values range.

It can be defined in an XML file with the <rotate> element. For more information, see the guide to Animation Resources.

Summary

XML Attributes
Attribute Name Related Method Description
android:drawable Reference to a drawable resource to use for the frame. 
android:fromDegrees setFromDegrees(float)  
android:pivotX setPivotX(float)  
android:pivotY setPivotY(float)  
android:toDegrees setToDegrees(float)  
android:visible Provides initial visibility state of the drawable; the default value is false. 
Public Constructors
RotateDrawable()
Create a new rotating drawable with an empty state.
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 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 getDrawable()
float getFromDegrees()
int getIntrinsicHeight()
Return the intrinsic height of the underlying drawable object.
int getIntrinsicWidth()
Return the intrinsic width of the underlying drawable object.
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.
float getPivotX()
float getPivotY()
float getToDegrees()
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 isPivotXRelative()
boolean isPivotYRelative()
boolean isStateful()
Indicates whether this drawable 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.
void setAlpha(int alpha)
Specify an alpha value for the drawable.
void setColorFilter(ColorFilter cf)
Specify an optional color filter for the drawable.
void setDrawable(Drawable drawable)
Sets the drawable rotated by this RotateDrawable.
void setFromDegrees(float fromDegrees)
Sets the start angle for rotation.
void setPivotX(float pivotX)
Sets the X position around which the drawable is rotated.
void setPivotXRelative(boolean relative)
Sets whether the X pivot value represents a fraction of the drawable width or an absolute value in pixels.
void setPivotY(float pivotY)
Sets the Y position around which the drawable is rotated.
void setPivotYRelative(boolean relative)
Sets whether the Y pivot value represents a fraction of the drawable height or an absolute value in pixels.
void setTintList(ColorStateList tint)
Specifies a tint for this drawable as a color state list.
void setTintMode(PorterDuff.Mode tintMode)
Specifies a tint blending mode for this drawable.
void setToDegrees(float toDegrees)
Sets the end angle for rotation.
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.
[Expand]
Inherited Methods
From class android.graphics.drawable.Drawable
From class java.lang.Object
From interface android.graphics.drawable.Drawable.Callback

XML Attributes

android:drawable

Reference to a drawable resource to use for the frame. If not given, the drawable must be defined by the first child tag.

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:fromDegrees

Related Methods

android:pivotX

Related Methods

android:pivotY

Related Methods

android:toDegrees

Related Methods

android:visible

Provides initial visibility state of the drawable; the default value is false. See setVisible(boolean, boolean).

Must be a boolean value, either "true" or "false".

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 visible.

Related Methods

Public Constructors

public RotateDrawable ()

Added in API level 1

Create a new rotating drawable with an empty state.

Public Methods

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 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.

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
  • 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
  • The ConstantState associated to that Drawable.

public Drawable getDrawable ()

Added in API level 3

Returns
  • The drawable rotated by this RotateDrawable

public float getFromDegrees ()

Added in API level 21

Related XML Attributes
Returns
  • The starting angle for rotation in degrees

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.

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.

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.

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)

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).

Returns
  • true if this drawable actually has a padding, else false. When false is returned, the padding is always set to 0.

public float getPivotX ()

Added in API level 21

Related XML Attributes
Returns
  • X position around which to rotate
See Also

public float getPivotY ()

Added in API level 21

Related XML Attributes
Returns
  • Y position around which to rotate
See Also

public float getToDegrees ()

Added in API level 21

Related XML Attributes
Returns
  • The ending angle for rotation in degrees

public void inflate (Resources r, XmlPullParser parser, AttributeSet attrs, Resources.Theme theme)

Added in API level 21

Inflate this Drawable from an XML resource optionally styled by a theme.

Parameters
r Resources used to resolve attribute values
parser XML parser from which to inflate this Drawable
attrs Base set of attribute values
theme Theme to apply, may be null

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 The drawable that is requesting the update.

public boolean isPivotXRelative ()

Added in API level 21

Returns
  • True if the X pivot represents a fraction of the drawable width, or false if it represents an absolute value in pixels

public boolean isPivotYRelative ()

Added in API level 21

Returns
  • True if the Y pivot represents a fraction of the drawable height, or false if it represents an absolute value in pixels

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
  • True if this drawable changes its appearance based on state, false otherwise.

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
  • This drawable.

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

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.

public void setColorFilter (ColorFilter cf)

Added in API level 1

Specify an optional color filter for the drawable. Pass null to remove any existing color filter.

Parameters
cf the color filter to apply, or null to remove the existing color filter

public void setDrawable (Drawable drawable)

Added in API level 21

Sets the drawable rotated by this RotateDrawable.

Parameters
drawable The drawable to rotate

public void setFromDegrees (float fromDegrees)

Added in API level 21

Sets the start angle for rotation.

Related XML Attributes
Parameters
fromDegrees Starting angle in degrees
See Also

public void setPivotX (float pivotX)

Added in API level 21

Sets the X position around which the drawable is rotated.

Related XML Attributes
Parameters
pivotX X position around which to rotate. If the X pivot is relative, the position represents a fraction of the drawable width. Otherwise, the position represents an absolute value in pixels.

public void setPivotXRelative (boolean relative)

Added in API level 21

Sets whether the X pivot value represents a fraction of the drawable width or an absolute value in pixels.

Parameters
relative True if the X pivot represents a fraction of the drawable width, or false if it represents an absolute value in pixels

public void setPivotY (float pivotY)

Added in API level 21

Sets the Y position around which the drawable is rotated.

Related XML Attributes
Parameters
pivotY Y position around which to rotate. If the Y pivot is relative, the position represents a fraction of the drawable height. Otherwise, the position represents an absolute value in pixels.
See Also

public void setPivotYRelative (boolean relative)

Added in API level 21

Sets whether the Y pivot value represents a fraction of the drawable height or an absolute value in pixels.

Parameters
relative True if the Y pivot represents a fraction of the drawable height, or false if it represents an absolute value in pixels

public void setTintList (ColorStateList tint)

Added in API level 21

Specifies a tint for this drawable as a color state list.

Setting a color filter via setColorFilter(ColorFilter) overrides tint.

Parameters
tint 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.

Setting a color filter via setColorFilter(ColorFilter) overrides tint.

Parameters
tintMode A Porter-Duff blending mode

public void setToDegrees (float toDegrees)

Added in API level 21

Sets the end angle for rotation.

Related XML Attributes
Parameters
toDegrees Ending angle in degrees
See Also

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 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)

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 The drawable being unscheduled.
what 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.

protected boolean onLevelChange (int level)

Added in API level 1

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)

Added in API level 1

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.