LevelListDrawable

Kotlin |Java

open class LevelListDrawable : DrawableContainer

kotlin.Any
↳	android.graphics.drawable.Drawable
	↳	android.graphics.drawable.DrawableContainer
		↳	android.graphics.drawable.LevelListDrawable

A resource that manages a number of alternate Drawables, each assigned a maximum numerical value. Setting the level value of the object with setLevel(int) will load the image with the next greater or equal value assigned to its max attribute. A good example use of a LevelListDrawable would be a battery level indicator icon, with different images to indicate the current battery level.

It can be defined in an XML file with the <level-list> element. Each Drawable level is defined in a nested <item>. For example:

<level-list xmlns:android="http://schemas.android.com/apk/res/android">
   <item android:maxLevel="0" android:drawable="@drawable/ic_wifi_signal_1" />
   <item android:maxLevel="1" android:drawable="@drawable/ic_wifi_signal_2" />
   <item android:maxLevel="2" android:drawable="@drawable/ic_wifi_signal_3" />
   <item android:maxLevel="3" android:drawable="@drawable/ic_wifi_signal_4" />
  </level-list>

With this XML saved into the res/drawable/ folder of the project, it can be referenced as the drawable for an android.widget.ImageView. The default image is the first in the list. It can then be changed to one of the other levels with android.widget.ImageView#setImageLevel(int). For more information, see the guide to Drawable Resources.

Summary

XML attributes
`android:drawable`	Reference to a drawable resource to use for the frame.
`android:maxLevel`	The maximum level allowed for this item.
`android:minLevel`	The minimum level allowed for this item.

Public constructors
`LevelListDrawable()`

Public methods
open Unit	`addLevel(low: Int, high: Int, drawable: Drawable!)`
open Unit	`inflate(r: Resources, parser: XmlPullParser, attrs: AttributeSet, theme: Resources.Theme?)`
open Drawable	`mutate()`

Protected methods
open Boolean	`onLevelChange(level: Int)`
open Unit	`setConstantState(state: DrawableContainer.DrawableContainerState)`

Inherited functions

From class DrawableContainer

`Unit`	`applyTheme(theme: Resources.Theme)`
`Boolean`	`canApplyTheme()`
`Unit`	`draw(canvas: Canvas)`
`Int`	`getAlpha()`
`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.
`Drawable.ConstantState?`	`getConstantState()`
`Drawable`	`getCurrent()`
`Unit`	`getHotspotBounds(outRect: Rect)`
`Int`	`getIntrinsicHeight()`
`Int`	`getIntrinsicWidth()`
`Int`	`getMinimumHeight()`
`Int`	`getMinimumWidth()`
`Int`	`getOpacity()`
`Insets`	`getOpticalInsets()`
`Unit`	`getOutline(outline: Outline)` Called to get the drawable to populate the Outline that defines its drawing area. This method is called by the default `android.view.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.
`Boolean`	`getPadding(padding: Rect)`
`Boolean`	`hasFocusStateSpecified()`
`Unit`	`invalidateDrawable(who: Drawable)` 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).
`Boolean`	`isAutoMirrored()`
`Boolean`	`isStateful()`
`Unit`	`jumpToCurrentState()`
`Unit`	`onBoundsChange(bounds: Rect)`
`Boolean`	`onLayoutDirectionChanged(layoutDirection: Int)` Called when the drawable's resolved layout direction changes.
`Boolean`	`onStateChange(state: IntArray)`
`Unit`	`scheduleDrawable(who: Drawable, what: Runnable, when: Long)` A Drawable can call this to schedule the next frame of its animation. An implementation can generally simply call `android.os.Handler#postAtTime(Runnable, Object, long)` with the parameters (what, who, when) to perform the scheduling.
`Boolean`	`selectDrawable(index: Int)` Sets the currently displayed drawable by index. If an invalid index is specified, the current drawable will be set to `null` and the index will be set to `-1`.
`Unit`	`setAlpha(alpha: Int)`
`Unit`	`setAutoMirrored(mirrored: Boolean)`
`Unit`	`setColorFilter(colorFilter: ColorFilter?)`
`Unit`	`setDither(dither: Boolean)`
`Unit`	`setEnterFadeDuration(ms: Int)` Change the global fade duration when a new drawable is entering the scene.
`Unit`	`setExitFadeDuration(ms: Int)` Change the global fade duration when a new drawable is leaving the scene.
`Unit`	`setHotspot(x: Float, y: Float)`
`Unit`	`setHotspotBounds(left: Int, top: Int, right: Int, bottom: Int)`
`Unit`	`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)`
`Unit`	`setTintList(tint: ColorStateList?)`
`Boolean`	`setVisible(visible: Boolean, restart: Boolean)`
`Unit`	`unscheduleDrawable(who: Drawable, what: Runnable)` A Drawable can call this to unschedule an action previously scheduled with `scheduleDrawable`. An implementation can generally simply call `android.os.Handler#removeCallbacks(Runnable, Object)` with the parameters (what, who) to unschedule the drawable.

From class Drawable

`Unit`	`clearColorFilter()` Removes the color filter for this drawable.
`Unit`	`copyBounds(bounds: Rect)` Return a copy of the drawable's bounds in the specified Rect (allocated by the caller). The bounds specify where this will draw when its draw() method is called.
`Rect`	`copyBounds()` Return a copy of the drawable's bounds in a new Rect. This returns the same values as getBounds(), but the returned object is guaranteed to not be changed later by the drawable (i.e. it retains no reference to this rect). If the caller already has a Rect allocated, call copyBounds(rect).
`Drawable?`	`createFromPath(pathName: String!)` Create a drawable from file path name.
`Drawable?`	`createFromResourceStream(res: Resources?, value: TypedValue?, is: InputStream?, srcName: String?)` Create a drawable from an inputstream, using the given resources and value to determine density information.
`Drawable?`	`createFromResourceStream(res: Resources?, value: TypedValue?, is: InputStream?, srcName: String?, opts: BitmapFactory.Options?)` Create a drawable from an inputstream, using the given resources and value to determine density information.
`Drawable?`	`createFromStream(is: InputStream?, srcName: String?)` Create a drawable from an inputstream
`Drawable`	`createFromXml(r: Resources, parser: XmlPullParser)` Create a drawable from an XML document. For more information on how to create resources in XML, see Drawable Resources.
`Drawable`	`createFromXml(r: Resources, parser: XmlPullParser, theme: Resources.Theme?)` Create a drawable from an XML document using an optional `Theme`. For more information on how to create resources in XML, see Drawable Resources.
`Drawable`	`createFromXmlInner(r: Resources, parser: XmlPullParser, attrs: AttributeSet)` Create from inside an XML document. Called on a parser positioned at a tag in an XML document, tries to create a Drawable from that tag. Returns null if the tag is not a valid drawable.
`Drawable`	`createFromXmlInner(r: Resources, parser: XmlPullParser, attrs: AttributeSet, theme: Resources.Theme?)` Create a drawable from inside an XML document using an optional `Theme`. Called on a parser positioned at a tag in an XML document, tries to create a Drawable from that tag. Returns `null` if the tag is not a valid drawable.
`Rect`	`getBounds()` Return the drawable's bounds Rect. Note: for efficiency, the returned object may be the same object stored in the drawable (though this is not guaranteed), so if a persistent copy of the bounds is needed, call copyBounds(rect) instead. You should also not change the object returned by this method as it may be the same object stored in the drawable.
`Drawable.Callback?`	`getCallback()` Return the current `Callback` implementation attached to this Drawable.
`ColorFilter?`	`getColorFilter()` Returns the current color filter, or `null` if none set.
`Rect`	`getDirtyBounds()` Return the drawable's dirty bounds Rect. Note: for efficiency, the returned object may be the same object stored in the drawable (though this is not guaranteed). By default, this returns the full drawable bounds. Custom drawables may override this method to perform more precise invalidation.
`Int`	`getLayoutDirection()` Returns the resolved layout direction for this Drawable.
`Int`	`getLevel()` Retrieve the current level.
`IntArray`	`getState()` Describes the current state, as a union of primitve states, such as `android.R.attr#state_focused`, `android.R.attr#state_selected`, etc. Some drawables may modify their imagery based on the selected state.
`Region?`	`getTransparentRegion()` Returns a Region representing the part of the Drawable that is completely transparent. This can be used to perform drawing operations, identifying which parts of the target will not change when rendering the Drawable. The default implementation returns null, indicating no transparent region; subclasses can optionally override this to return an actual Region if they want to supply this optimization information, but it is not required that they do so.
`Unit`	`inflate(r: Resources, parser: XmlPullParser, attrs: AttributeSet)` Inflate this Drawable from an XML resource. Does not apply a theme.
`Unit`	`inflate(r: Resources, parser: XmlPullParser, attrs: AttributeSet, theme: Resources.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.
`Unit`	`invalidateSelf()` Use the current `Callback` implementation to have this Drawable redrawn. Does nothing if there is no Callback attached to the Drawable.
`Boolean`	`isFilterBitmap()`
`Boolean`	`isProjected()` Whether this drawable requests projection. Indicates that the `android.graphics.RenderNode` this Drawable will draw into should be drawn immediately after the closest ancestor RenderNode containing a projection receiver.
`Boolean`	`isVisible()`
`Int`	`resolveOpacity(op1: Int, op2: Int)` Return the appropriate opacity value for two source opacities. If either is UNKNOWN, that is returned; else, if either is TRANSLUCENT, that is returned; else, if either is TRANSPARENT, that is returned; else, OPAQUE is returned. This is to help in implementing `getOpacity`.
`Unit`	`scheduleSelf(what: Runnable, when: Long)` Use the current `Callback` implementation to have this Drawable scheduled. Does nothing if there is no Callback attached to the Drawable.
`Unit`	`setBounds(left: Int, top: Int, right: Int, bottom: Int)` Specify a bounding rectangle for the Drawable. This is where the drawable will draw when its draw() method is called.
`Unit`	`setBounds(bounds: Rect)` Specify a bounding rectangle for the Drawable. This is where the drawable will draw when its draw() method is called.
`Unit`	`setCallback(cb: Drawable.Callback?)` Bind a `Callback` object to this Drawable. Required for clients that want to support animated drawables.
`Unit`	`setChangingConfigurations(configs: Int)` Set a mask of the configuration parameters for which this drawable may change, requiring that it be re-created.
`Unit`	`setColorFilter(color: Int, mode: PorterDuff.Mode)` Specify a color and Porter-Duff mode to be the color filter for this drawable. Convenience for `setColorFilter(android.graphics.ColorFilter)` which constructs a `PorterDuffColorFilter`. Note: Setting a color filter disables `tint`.
`Unit`	`setFilterBitmap(filter: Boolean)` Set to true to have the drawable filter its bitmaps with bilinear sampling when they are scaled or rotated. This can improve appearance when bitmaps are rotated. If the drawable does not use bitmaps, this call is ignored.
`Boolean`	`setLayoutDirection(layoutDirection: Int)` Set the layout direction for this drawable. Should be a resolved layout direction, as the Drawable has no capacity to do the resolution on its own.
`Boolean`	`setLevel(level: Int)` Specify the level for the drawable. This allows a drawable to vary its imagery based on a continuous controller, for example to show progress or volume level. If the new level you are supplying causes the appearance of the Drawable to change, then it is responsible for calling `invalidateSelf` in order to have itself redrawn, and true will be returned from this function.
`Boolean`	`setState(stateSet: IntArray)` Specify a set of states for the drawable. These are use-case specific, so see the relevant documentation. As an example, the background for widgets like Button understand the following states: [`android.R.attr#state_focused`, `android.R.attr#state_pressed`]. If the new state you are supplying causes the appearance of the Drawable to change, then it is responsible for calling `invalidateSelf` in order to have itself redrawn, and true will be returned from this function. Note: The Drawable holds a reference on to stateSet until a new state array is given to it, so you must not modify this array during that time.
`Unit`	`setTint(tintColor: Int)` Specifies tint color for this drawable. 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)`. To clear the tint, pass `null` to `setTintList(android.content.res.ColorStateList)`. Note: Setting a color filter via `setColorFilter(android.graphics.ColorFilter)` or `setColorFilter(int,android.graphics.PorterDuff.Mode)` overrides tint.
`Unit`	`setTintMode(tintMode: PorterDuff.Mode?)` 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 `PorterDuff.Mode#SRC_IN`. Note: Setting a color filter via `setColorFilter(android.graphics.ColorFilter)` or `setColorFilter(int,android.graphics.PorterDuff.Mode)` overrides tint.
`Unit`	`unscheduleSelf(what: Runnable)` Use the current `Callback` implementation to have this Drawable unscheduled. Does nothing if there is no Callback attached to the Drawable.

XML attributes

android:drawable

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.

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

android:maxLevel

android:maxLevel

The maximum level allowed for this item.

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

android:minLevel

android:minLevel

The minimum level allowed for this item.

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

Public constructors

LevelListDrawable

Added in API level 1

LevelListDrawable()

Public methods

addLevel

Added in API level 1

open fun addLevel(
    low: Int, 
    high: Int, 
    drawable: Drawable!
): Unit

inflate

Added in API level 21

open fun inflate(
    r: Resources, 
    parser: XmlPullParser, 
    attrs: AttributeSet, 
    theme: Resources.Theme?
): Unit

Parameters
`r`	Resources: Resources used to resolve attribute values This value cannot be `null`.
`parser`	XmlPullParser: XML parser from which to inflate this Drawable This value cannot be `null`.
`attrs`	AttributeSet: Base set of attribute values This value cannot be `null`.
`theme`	Resources.Theme?: Theme to apply, may be null

Exceptions
`org.xmlpull.v1.XmlPullParserException`
`java.io.IOException`

mutate

Added in API level 3

open fun mutate(): Drawable

Return
`Drawable`	This drawable. This value cannot be `null`.

Protected methods

onLevelChange

Added in API level 1

protected open fun onLevelChange(level: Int): Boolean

Return
`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.

setConstantState

Added in API level 1

protected open fun setConstantState(state: DrawableContainer.DrawableContainerState): Unit

Parameters
`state`	DrawableContainer.DrawableContainerState: This value cannot be `null`.