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# ScaleDrawable

`public class ScaleDrawable`
`` `` `extends DrawableWrapper` ``

java.lang.Object
↳ | android.graphics.drawable.Drawable
| ↳ | android.graphics.drawable.DrawableWrapper
|  | ↳ | android.graphics.drawable.ScaleDrawable

A Drawable that changes the size of another Drawable based on its current level value. You can control how much the child Drawable changes in width and height based on the level, as well as a gravity to control where it is placed in its overall container. Most often used to implement things like progress bars.

The default level may be specified from XML using the `android:level` property. When this property is not specified, the default level is 0, which corresponds to zero height and/or width depending on the values specified for `android.R.styleable#ScaleDrawable_scaleWidth scaleWidth` and `android.R.styleable#ScaleDrawable_scaleHeight scaleHeight`. At run time, the level may be set via `Drawable.setLevel(int)`.

A scale drawable may be defined in an XML file with the `<scale>` element. For more information, see the guide to Drawable Resources.

## Summary

### XML attributes
`android:drawable` | Reference to a drawable resource to draw with the specified scale.
`android:level` | Specifies the initial drawable level in the range 0 to 10000.
`android:scaleGravity` | Specifies where the drawable is positioned after scaling.
`android:scaleHeight` | Scale height, expressed as a percentage of the drawable's bound.
`android:scaleWidth` | Scale width, expressed as a percentage of the drawable's bound.

### Public constructors
`ScaleDrawable(Drawable drawable, int gravity, float scaleWidth, float scaleHeight)` Creates a new scale drawable with the specified gravity and scale properties.

### Public methods
`void` | `applyTheme(Resources.Theme t)` Applies the specified theme to this Drawable and its children.
`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` | `getOpacity()` This method is deprecated. This method is no longer used in graphics optimizations
`void` | `inflate(Resources r, XmlPullParser parser, AttributeSet attrs, Resources.Theme theme)` Inflate this Drawable from an XML resource optionally styled by a theme.

### 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.

### Inherited methods
From class `android.graphics.drawable.DrawableWrapper`
`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).
`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.
`ColorFilter` | `getColorFilter()` Returns the current color filter, or `null` if none set.
`Drawable.ConstantState` | `getConstantState()` Return a `ConstantState` instance that holds the shared state of this Drawable.
`Drawable` | `getDrawable()`
`void` | `getHotspotBounds(Rect outRect)` Populates `outRect` with the hotspot bounds.
`int` | `getIntrinsicHeight()` Returns the drawable's intrinsic height.
`int` | `getIntrinsicWidth()` Returns the drawable's intrinsic width.
`int` | `getOpacity()` This method is deprecated. This method is no longer used in graphics optimizations
`Insets` | `getOpticalInsets()` Return in insets the layout insets suggested by this Drawable for use with alignment operations during layout.
`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.
`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` | `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.
`void` | `onBoundsChange(Rect bounds)` Override this in your subclass to change appearance if you vary based on the bounds.
`boolean` | `onLayoutDirectionChanged(int layoutDirection)` Called when the drawable's resolved layout direction changes.
`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` | `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 colorFilter)` Specify an optional color filter for the drawable.
`void` | `setDrawable(Drawable dr)` Sets the wrapped drawable.
`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` | `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)`.
From class `android.graphics.drawable.Drawable`
`void` | `applyTheme(Resources.Theme t)` Applies the specified theme to this Drawable and its children.
`boolean` | `canApplyTheme()`
`void` | `clearColorFilter()` Removes the color filter for this drawable.
`final Rect` | `copyBounds()` Return a copy of the drawable's bounds in a new Rect.
`final void` | `copyBounds(Rect bounds)` Return a copy of the drawable's bounds in the specified Rect (allocated by the caller).
`static Drawable` | `createFromPath(String pathName)` Create a drawable from file path name.
`static Drawable` | `createFromResourceStream(Resources res, TypedValue value, InputStream is, String srcName, BitmapFactory.Options opts)` This method is deprecated. Prefer the version without an Options object.
`static Drawable` | `createFromResourceStream(Resources res, TypedValue value, InputStream is, String srcName)` Create a drawable from an inputstream, using the given resources and value to determine density information.
`static Drawable` | `createFromStream(InputStream is, String srcName)` Create a drawable from an inputstream
`static Drawable` | `createFromXml(Resources r, XmlPullParser parser)` Create a drawable from an XML document.
`static Drawable` | `createFromXml(Resources r, XmlPullParser parser, Resources.Theme theme)` Create a drawable from an XML document using an optional `Theme`.
`static Drawable` | `createFromXmlInner(Resources r, XmlPullParser parser, AttributeSet attrs, Resources.Theme theme)` Create a drawable from inside an XML document using an optional `Theme`.
`static Drawable` | `createFromXmlInner(Resources r, XmlPullParser parser, AttributeSet attrs)` Create from inside an XML document.
`abstract 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.
`final Rect` | `getBounds()` Return the drawable's bounds Rect.
`Drawable.Callback` | `getCallback()` Return the current `Callback` implementation attached to this Drawable.
`int` | `getChangingConfigurations()` Return a mask of the configuration parameters for which this drawable may change, requiring that it be re-created.
`ColorFilter` | `getColorFilter()` Returns the current color filter, or `null` if none set.
`Drawable.ConstantState` | `getConstantState()` Return a `ConstantState` instance that holds the shared state of this Drawable.
`Drawable` | `getCurrent()`
`Rect` | `getDirtyBounds()` Return the drawable's dirty bounds Rect.
`void` | `getHotspotBounds(Rect outRect)` Populates `outRect` with the hotspot bounds.
`int` | `getIntrinsicHeight()` Returns the drawable's intrinsic height.
`int` | `getIntrinsicWidth()` Returns the drawable's intrinsic width.
`int` | `getLayoutDirection()` Returns the resolved layout direction for this Drawable.
`final int` | `getLevel()` Retrieve the current level.
`int` | `getMinimumHeight()` Returns the minimum height suggested by this Drawable.
`int` | `getMinimumWidth()` Returns the minimum width suggested by this Drawable.
`abstract int` | `getOpacity()` This method is deprecated. This method is no longer used in graphics optimizations
`Insets` | `getOpticalInsets()` Return in insets the layout insets suggested by this Drawable for use with alignment operations during layout.
`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.
`int[]` | `getState()` Describes the current state, as a union of primitve states, such as `R.attr.state_focused`, `R.attr.state_selected`, etc.
`Region` | `getTransparentRegion()` Returns a Region representing the part of the Drawable that is completely transparent.
`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` | `inflate(Resources r, XmlPullParser parser, AttributeSet attrs)` Inflate this Drawable from an XML resource.
`void` | `invalidateSelf()` Use the current `Callback` implementation to have this Drawable redrawn.
`boolean` | `isAutoMirrored()` Tells if this Drawable will be automatically mirrored when its layout direction is RTL right-to-left.
`boolean` | `isFilterBitmap()`
`boolean` | `isProjected()` Whether this drawable requests projection.
`boolean` | `isStateful()` Indicates whether this drawable will change its appearance based on state.
`final boolean` | `isVisible()`
`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.
`void` | `onBoundsChange(Rect bounds)` Override this in your subclass to change appearance if you vary based on the bounds.
`boolean` | `onLayoutDirectionChanged(int layoutDirection)` Called when the drawable's resolved layout direction changes.
`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.
`static int` | `resolveOpacity(int op1, int op2)` Return the appropriate opacity value for two source opacities.
`void` | `scheduleSelf(Runnable what, long when)` Use the current `Callback` implementation to have this Drawable scheduled.
`abstract 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` | `setBounds(int left, int top, int right, int bottom)` Specify a bounding rectangle for the Drawable.
`void` | `setBounds(Rect bounds)` Specify a bounding rectangle for the Drawable.
`final void` | `setCallback(Drawable.Callback cb)` Bind a `Callback` object to this Drawable.
`void` | `setChangingConfigurations(int configs)` Set a mask of the configuration parameters for which this drawable may change, requiring that it be re-created.
`void` | `setColorFilter(int color, PorterDuff.Mode mode)` This method is deprecated. use `setColorFilter(android.graphics.ColorFilter)` with an instance of `BlendModeColorFilter`
`abstract 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` | `setFilterBitmap(boolean filter)` Set to true to have the drawable filter its bitmaps with bilinear sampling when they are scaled or rotated.
`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.
`final boolean` | `setLayoutDirection(int layoutDirection)` Set the layout direction for this drawable.
`final boolean` | `setLevel(int level)` Specify the level for the drawable.
`boolean` | `setState(int[] stateSet)` Specify a set of states for the drawable.
`void` | `setTint(int tintColor)` Specifies tint color for this drawable.
`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.
`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` | `unscheduleSelf(Runnable what)` Use the current `Callback` implementation to have this Drawable unscheduled.
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.
From interface `android.graphics.drawable.Drawable.Callback`
`abstract void` | `invalidateDrawable(Drawable who)` Called when the drawable needs to be redrawn.
`abstract void` | `scheduleDrawable(Drawable who, Runnable what, long when)` A Drawable can call this to schedule the next frame of its animation.
`abstract void` | `unscheduleDrawable(Drawable who, Runnable what)` A Drawable can call this to unschedule an action previously scheduled with `scheduleDrawable(Drawable, Runnable, long)`.

## XML attributes

### android:drawable

Reference to a drawable resource to draw with the specified scale.

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

### android:level

Specifies the initial drawable level in the range 0 to 10000.

May be an integer value, such as "`100`".

### android:scaleGravity

Specifies where the drawable is positioned after scaling. The default value is left.

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

Constant | Value | Description
--- | --- | ---
bottom | 50 | Push object to the bottom of its container, not changing its size.
center | 11 | Place the object in the center of its container in both the vertical and horizontal axis, not changing its size.
center_horizontal | 1 | Place object in the horizontal center of its container, not changing its size.
center_vertical | 10 | Place object in the vertical center of its container, not changing its size.
clip_horizontal | 8 | 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.
clip_vertical | 80 | 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.
end | 800005 | Push object to the end of its container, not changing its size.
fill | 77 | Grow the horizontal and vertical size of the object if needed so it completely fills its container.
fill_horizontal | 7 | Grow the horizontal size of the object if needed so it completely fills its container.
fill_vertical | 70 | Grow the vertical size of the object if needed so it completely fills its container.
left | 3 | Push object to the left of its container, not changing its size.
right | 5 | Push object to the right of its container, not changing its size.
start | 800003 | Push object to the beginning of its container, not changing its size.
top | 30 | Push object to the top of its container, not changing its size.

### android:scaleHeight

Scale height, expressed as a percentage of the drawable's bound. The value's format is XX%. For instance: 100%, 12.5%, etc.

May be a string value, using '\\;' to escape characters such as '\\n' or '\\uxxxx' for a unicode character;

### android:scaleWidth

Scale width, expressed as a percentage of the drawable's bound. The value's format is XX%. For instance: 100%, 12.5%, etc.

May be a string value, using '\\;' to escape characters such as '\\n' or '\\uxxxx' for a unicode character;

## Public constructors

### ScaleDrawable

    public ScaleDrawable (Drawable drawable,
                    int gravity,
                    float scaleWidth,
                    float scaleHeight)

Creates a new scale drawable with the specified gravity and scale properties.

Parameters
`drawable` | `Drawable`: the drawable to scale
`gravity` | `int`: gravity constant (see `Gravity` used to position the scaled drawable within the parent container
`scaleWidth` | `float`: width scaling factor [0...1] to use then the level is at the maximum value, or -1 to not scale width
`scaleHeight` | `float`: height scaling factor [0...1] to use then the level is at the maximum value, or -1 to not scale height

## Public methods

### applyTheme

    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`.

### draw

    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`: This value cannot be `null`.

### getOpacity

    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`

### inflate

    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` |

## Protected methods

### onBoundsChange

    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

    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.

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