androidx.core.view

Kotlin |Java

Interfaces

`ActionProvider.VisibilityListener`	Listens to changes in visibility as reported by `refreshVisibility`.
`DifferentialMotionFlingTarget`	Represents an entity that may be flung by a differential motion or an entity that initiates fling on a target View.
`DragStartHelper.OnDragStartListener`	Interface definition for a callback to be invoked when a drag start gesture is detected.
`LayoutInflaterFactory`	This interface is deprecated. Use `android.view.LayoutInflater.Factory2` directly.
`MenuHost`	A class that allows you to host and keep track of `MenuProvider`s that will supply `android.view.MenuItem`s to the app bar.
`MenuItemCompat.OnActionExpandListener`	This interface is deprecated. Use `MenuItem.OnActionExpandListener` directly.
`MenuProvider`	Interface for indicating that a component will be supplying `MenuItem`s to the component owning the app bar.
`NestedScrollingChild`	This interface should be implemented by `View` subclasses that wish to support dispatching nested scrolling operations to a cooperating parent `ViewGroup`.
`NestedScrollingChild2`	This interface should be implemented by `View` subclasses that wish to support dispatching nested scrolling operations to a cooperating parent `ViewGroup`.
`NestedScrollingChild3`	This interface should be implemented by `View` subclasses that wish to support dispatching nested scrolling operations to a cooperating parent `ViewGroup`.
`NestedScrollingParent`	This interface should be implemented by `ViewGroup` subclasses that wish to support scrolling operations delegated by a nested child view.
`NestedScrollingParent2`	This interface should be implemented by `ViewGroup` subclasses that wish to support scrolling operations delegated by a nested child view.
`NestedScrollingParent3`	This interface should be implemented by `ViewGroup` subclasses that wish to support scrolling operations delegated by a nested child view.
`OnApplyWindowInsetsListener`	Listener for applying window insets on a view in a custom way.
`OnReceiveContentListener`	Listener for apps to implement handling for insertion of content.
`OnReceiveContentViewBehavior`	Interface for widgets to implement default behavior for receiving content.
`ScrollingView`	An interface that can be implemented by Views to provide scroll related APIs.
`TintableBackgroundView`	Interface which allows a `android.view.View` to receive background tinting calls from `ViewCompat` when running on API v20 devices or lower.
`ViewCompat.OnUnhandledKeyEventListenerCompat`	Interface definition for a callback to be invoked when a hardware key event hasn't been handled by the view hierarchy.
`ViewPropertyAnimatorListener`	An animation listener receives notifications from an animation.
`ViewPropertyAnimatorUpdateListener`	Implementors of this interface can add themselves as update listeners to an `ViewPropertyAnimatorCompat` instance to receive callbacks on every animation frame, after the current frame's values have been calculated for that `ViewPropertyAnimatorCompat`.
`WindowInsetsAnimationControlListenerCompat`	Listener that encapsulates a request to `controlWindowInsetsAnimation`.
`WindowInsetsControllerCompat.OnControllableInsetsChangedListener`	Listener to be notified when the set of controllable `WindowInsetsCompat.Type` controlled by a `WindowInsetsController` changes.

Classes

`AccessibilityDelegateCompat`	Helper for accessing `AccessibilityDelegate`.
`ActionProvider`	This class is a mediator for accomplishing a given task, for example sharing a file.
`ContentInfoCompat`	Holds all the relevant data for a request to `OnReceiveContentListener`.
`ContentInfoCompat.Builder`	Builder for `ContentInfoCompat`.
`DifferentialMotionFlingController`	Controller differential motion flings.
`DisplayCompat`	A class for retrieving accurate display modes for a display.
`DisplayCompat.ModeCompat`	Compat class which provides access to the underlying display mode, if there is one, and a more reliable display mode size.
`DisplayCutoutCompat`	Represents the area of the display that is not functional for displaying content.
`DragAndDropPermissionsCompat`	Helper for accessing features in `DragAndDropPermissions` a backwards compatible fashion.
`DragStartHelper`	DragStartHelper is a utility class for implementing drag and drop support.
`GestureDetectorCompat`	This class is deprecated. Use `android.view.GestureDetector` directly
`GravityCompat`	Compatibility shim for accessing newer functionality from `Gravity`.
`HapticFeedbackConstantsCompat`	Helper class for accessing values in `android.view.HapticFeedbackConstants`.
`InputDeviceCompat`	Helper class for accessing values in `android.view.InputDevice`.
`LayoutInflaterCompat`	Helper for accessing features in `LayoutInflater`.
`MarginLayoutParamsCompat`	This class is deprecated. Use `ViewGroup.MarginLayoutParams` directly.
`MenuCompat`	Helper for accessing features in `Menu`.
`MenuHostHelper`	Helper class for implementing `MenuHost`.
`MenuItemCompat`	Helper for accessing features in `MenuItem`.
`MotionEventCompat`	Helper for accessing features in `MotionEvent`.
`NestedScrollingChildHelper`	Helper class for implementing nested scrolling child views compatible with Android platform versions earlier than Android 5.0 Lollipop (API 21).
`NestedScrollingParentHelper`	Helper class for implementing nested scrolling parent views compatible with Android platform versions earlier than Android 5.0 Lollipop (API 21).
`OneShotPreDrawListener`	An OnPreDrawListener that will remove itself after one OnPreDraw call.
`PointerIconCompat`	Helper for accessing features in `PointerIcon` in a backwards compatible fashion.
`ScaleGestureDetectorCompat`	Helper for accessing features in `ScaleGestureDetector`.
`ScrollFeedbackProviderCompat`	Compat to access ScrollFeedbackProvider across different build versions.
`SoftwareKeyboardControllerCompat`	Provide controls for showing and hiding the IME.
`VelocityTrackerCompat`	Helper for accessing features in `VelocityTracker`.
`ViewCompat`	Helper for accessing features in `View`.
`ViewConfigurationCompat`	Helper for accessing features in `ViewConfiguration`.
`ViewGroupCompat`	Helper for accessing features in `ViewGroup`.
`ViewParentCompat`	Helper for accessing features in `ViewParent`.
`ViewPropertyAnimatorCompat`
`ViewPropertyAnimatorListenerAdapter`	This adapter class provides empty implementations of the methods from `ViewPropertyAnimatorListener`.
`ViewStructureCompat`	Helper for accessing features in `ViewStructure`.
`WindowCompat`	Helper for accessing features in `Window`.
`WindowInsetsAnimationCompat`	Class representing an animation of a set of windows that cause insets.
`WindowInsetsAnimationCompat.BoundsCompat`	Class representing the range of an `WindowInsetsAnimationCompat`
`WindowInsetsAnimationCompat.Callback`	Interface that allows the application to listen to animation events for windows that cause insets.
`WindowInsetsAnimationControllerCompat`	Controller for app-driven animation of system windows.
`WindowInsetsCompat`	Describes a set of insets for window content.
`WindowInsetsCompat.Builder`	Builder for `WindowInsetsCompat`.
`WindowInsetsCompat.Type`	Class that defines different types of sources causing window insets.
`WindowInsetsControllerCompat`	Provide simple controls of windows that generate insets.

Extension functions summary

`operator Boolean`	`Menu.contains(item: MenuItem)` Returns `true` if `item` is found in this menu.
`inline operator Boolean`	`ViewGroup.contains(view: View)` Returns `true` if `view` is found in this view group.
`inline Unit`	`View.doOnAttach(crossinline action: (view: View) -> Unit)` Performs the given action when this view is attached to a window.
`inline Unit`	`View.doOnDetach(crossinline action: (view: View) -> Unit)` Performs the given action when this view is detached from a window.
`inline Unit`	`View.doOnLayout(crossinline action: (view: View) -> Unit)` Performs the given action when this view is laid out.
`inline Unit`	`View.doOnNextLayout(crossinline action: (view: View) -> Unit)` Performs the given action when this view is next laid out.
`inline OneShotPreDrawListener`	`View.doOnPreDraw(crossinline action: (view: View) -> Unit)` Performs the given action when the view tree is about to be drawn.
`Bitmap`	`View.drawToBitmap(config: Bitmap.Config)` Return a `Bitmap` representation of this `View`.
`inline Unit`	`Menu.forEach(action: (item: MenuItem) -> Unit)` Performs the given action on each item in this menu.
`inline Unit`	`ViewGroup.forEach(action: (view: View) -> Unit)` Performs the given action on each view in this view group.
`inline Unit`	`Menu.forEachIndexed(action: (index: Int, item: MenuItem) -> Unit)` Performs the given action on each item in this menu, providing its sequential index.
`inline Unit`	`ViewGroup.forEachIndexed(action: (index: Int, view: View) -> Unit)` Performs the given action on each view in this view group, providing its sequential index.
`inline operator MenuItem`	`Menu.get(index: Int)` Returns the menu at `index`.
`operator View`	`ViewGroup.get(index: Int)` Returns the view at `index`.
`inline Boolean`	`Menu.isEmpty()` Returns true if this menu contains no items.
`inline Boolean`	`ViewGroup.isEmpty()` Returns true if this view group contains no views.
`inline Boolean`	`Menu.isNotEmpty()` Returns true if this menu contains one or more items.
`inline Boolean`	`ViewGroup.isNotEmpty()` Returns true if this view group contains one or more views.
`operator MutableIterator<MenuItem>`	`Menu.iterator()` Returns a `MutableIterator` over the items in this menu.
`operator MutableIterator<View>`	`ViewGroup.iterator()` Returns a `MutableIterator` over the views in this view group.
`inline operator Unit`	`Menu.minusAssign(item: MenuItem)` Removes `item` from this menu.
`inline operator Unit`	`ViewGroup.minusAssign(view: View)` Removes `view` from this view group.
`inline operator Unit`	`ViewGroup.plusAssign(view: View)` Adds `view` to this view group.
`inline Runnable`	`View.postDelayed(delayInMillis: Long, crossinline action: () -> Unit)` Version of `View.postDelayed` which re-orders the parameters, allowing the action to be placed outside of parentheses.
`Runnable`	`View.postOnAnimationDelayed(delayInMillis: Long, action: () -> Unit)` Version of `View.postOnAnimationDelayed` which re-orders the parameters, allowing the action to be placed outside of parentheses.
`inline Unit`	`Menu.removeItemAt(index: Int)` Removes the menu item at the specified index.
`inline Unit`	`ViewGroup.MarginLayoutParams.setMargins(size: @Px Int)` Sets the margins in the ViewGroup's MarginLayoutParams.
`inline Unit`	`View.setPadding(size: @Px Int)` Sets the view's padding.
`inline Unit`	`View.updateLayoutParams(block: ViewGroup.LayoutParams.() -> Unit)` Executes `block` with the View's layoutParams and reassigns the layoutParams with the updated version.
`inline Unit`	`<T : ViewGroup.LayoutParams> View.updateLayoutParams(block: T.() -> Unit)` Executes `block` with a typed version of the View's layoutParams and reassigns the layoutParams with the updated version.
`inline Unit`	`ViewGroup.MarginLayoutParams.updateMargins( left: @Px Int, top: @Px Int, right: @Px Int, bottom: @Px Int )` Updates the margins in the `ViewGroup`'s `ViewGroup.MarginLayoutParams`.
`inline Unit`	`ViewGroup.MarginLayoutParams.updateMarginsRelative( start: @Px Int, top: @Px Int, end: @Px Int, bottom: @Px Int )` Updates the relative margins in the ViewGroup's MarginLayoutParams.
`inline Unit`	`View.updatePadding(left: @Px Int, top: @Px Int, right: @Px Int, bottom: @Px Int)` Updates this view's padding.
`inline Unit`	`View.updatePaddingRelative( start: @Px Int, top: @Px Int, end: @Px Int, bottom: @Px Int )` Updates this view's relative padding.

Extension properties summary

`Sequence<View>`	`View.allViews` Returns a `Sequence` over this view and its descendants recursively.
`Sequence<ViewParent>`	`View.ancestors` Returns a `Sequence` of the parent chain of this view by repeatedly calling `View.getParent`.
`Sequence<MenuItem>`	`Menu.children` Returns a `Sequence` over the items in this menu.
`Sequence<View>`	`ViewGroup.children` Returns a `Sequence` over the immediate child views in this view group.
`Sequence<View>`	`ViewGroup.descendants` Returns a `Sequence` over the child views in this view group recursively.
`IntRange`	`ViewGroup.indices` Returns an `IntRange` of the valid indices for the children of this view group.
`Boolean`	`View.isGone` Returns true when this view's visibility is `View.GONE`, false otherwise.
`Boolean`	`View.isInvisible` Returns true when this view's visibility is `View.INVISIBLE`, false otherwise.
`Boolean`	`View.isVisible` Returns true when this view's visibility is `View.VISIBLE`, false otherwise.
`Int`	`View.marginBottom` Returns the bottom margin if this view's `ViewGroup.LayoutParams` is a `ViewGroup.MarginLayoutParams`, otherwise 0.
`Int`	`View.marginEnd` Returns the end margin if this view's `ViewGroup.LayoutParams` is a `ViewGroup.MarginLayoutParams`, otherwise 0.
`Int`	`View.marginLeft` Returns the left margin if this view's `ViewGroup.LayoutParams` is a `ViewGroup.MarginLayoutParams`, otherwise 0.
`Int`	`View.marginRight` Returns the right margin if this view's `ViewGroup.LayoutParams` is a `ViewGroup.MarginLayoutParams`, otherwise 0.
`Int`	`View.marginStart` Returns the start margin if this view's `ViewGroup.LayoutParams` is a `ViewGroup.MarginLayoutParams`, otherwise 0.
`Int`	`View.marginTop` Returns the top margin if this view's `ViewGroup.LayoutParams` is a `ViewGroup.MarginLayoutParams`, otherwise 0.
`Int`	`Menu.size` Returns the number of items in this menu.
`Int`	`ViewGroup.size` Returns the number of views in this view group.

Extension functions

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

operator fun Menu.contains(item: MenuItem): Boolean

Returns true if item is found in this menu.

contains

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline operator fun ViewGroup.contains(view: View): Boolean

Returns true if view is found in this view group.

doOnAttach

Artifact: androidx.core:core-ktx

View Source

Added in 1.2.0

inline fun View.doOnAttach(crossinline action: (view: View) -> Unit): Unit

Performs the given action when this view is attached to a window. If the view is already attached to a window the action will be performed immediately, otherwise the action will be performed after the view is next attached.

The action will only be invoked once, and any listeners will then be removed.

See also
`doOnDetach`

doOnDetach

Artifact: androidx.core:core-ktx

View Source

Added in 1.2.0

inline fun View.doOnDetach(crossinline action: (view: View) -> Unit): Unit

Performs the given action when this view is detached from a window. If the view is not attached to a window the action will be performed immediately, otherwise the action will be performed after the view is detached from its current window.

The action will only be invoked once, and any listeners will then be removed.

See also
`doOnAttach`

doOnLayout

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline fun View.doOnLayout(crossinline action: (view: View) -> Unit): Unit

Performs the given action when this view is laid out. If the view has been laid out and it has not requested a layout, the action will be performed straight away, otherwise the action will be performed after the view is next laid out.

The action will only be invoked once on the next layout and then removed.

See also
`doOnNextLayout`

doOnNextLayout

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline fun View.doOnNextLayout(crossinline action: (view: View) -> Unit): Unit

Performs the given action when this view is next laid out.

The action will only be invoked once on the next layout and then removed.

See also
`doOnLayout`

doOnPreDraw

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline fun View.doOnPreDraw(crossinline action: (view: View) -> Unit): OneShotPreDrawListener

Performs the given action when the view tree is about to be drawn.

The action will only be invoked once prior to the next draw and then removed.

drawToBitmap

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

fun View.drawToBitmap(config: Bitmap.Config = Bitmap.Config.ARGB_8888): Bitmap

Return a Bitmap representation of this View.

The resulting bitmap will be the same width and height as this view's current layout dimensions. This does not take into account any transformations such as scale or translation.

Note, this will use the software rendering pipeline to draw the view to the bitmap. This may result with different drawing to what is rendered on a hardware accelerated canvas (such as the device screen).

If this view has not been laid out this method will throw a IllegalStateException.

Parameters
`config: Bitmap.Config = Bitmap.Config.ARGB_8888`	Bitmap config of the desired bitmap. Defaults to `Bitmap.Config.ARGB_8888`.

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline fun Menu.forEach(action: (item: MenuItem) -> Unit): Unit

Performs the given action on each item in this menu.

forEach

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline fun ViewGroup.forEach(action: (view: View) -> Unit): Unit

Performs the given action on each view in this view group.

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline fun Menu.forEachIndexed(action: (index: Int, item: MenuItem) -> Unit): Unit

Performs the given action on each item in this menu, providing its sequential index.

forEachIndexed

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline fun ViewGroup.forEachIndexed(action: (index: Int, view: View) -> Unit): Unit

Performs the given action on each view in this view group, providing its sequential index.

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline operator fun Menu.get(index: Int): MenuItem

Returns the menu at index.

Throws
`kotlin.IndexOutOfBoundsException`	if index is less than 0 or greater than or equal to the count.

get

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

operator fun ViewGroup.get(index: Int): View

Returns the view at index.

Throws
`kotlin.IndexOutOfBoundsException`	if index is less than 0 or greater than or equal to the count.

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline fun Menu.isEmpty(): Boolean

Returns true if this menu contains no items.

isEmpty

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline fun ViewGroup.isEmpty(): Boolean

Returns true if this view group contains no views.

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline fun Menu.isNotEmpty(): Boolean

Returns true if this menu contains one or more items.

isNotEmpty

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline fun ViewGroup.isNotEmpty(): Boolean

Returns true if this view group contains one or more views.

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

operator fun Menu.iterator(): MutableIterator<MenuItem>

Returns a MutableIterator over the items in this menu.

iterator

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

operator fun ViewGroup.iterator(): MutableIterator<View>

Returns a MutableIterator over the views in this view group.

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline operator fun Menu.minusAssign(item: MenuItem): Unit

Removes item from this menu.

minusAssign

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline operator fun ViewGroup.minusAssign(view: View): Unit

Removes view from this view group.

plusAssign

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline operator fun ViewGroup.plusAssign(view: View): Unit

Adds view to this view group.

postDelayed

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline fun View.postDelayed(delayInMillis: Long, crossinline action: () -> Unit): Runnable

Version of View.postDelayed which re-orders the parameters, allowing the action to be placed outside of parentheses.

view.postDelayed(200) {
    doSomething()
}

Returns
`Runnable`	the created Runnable

postOnAnimationDelayed

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

fun View.postOnAnimationDelayed(delayInMillis: Long, action: () -> Unit): Runnable

Version of View.postOnAnimationDelayed which re-orders the parameters, allowing the action to be placed outside of parentheses.

view.postOnAnimationDelayed(16) {
    doSomething()
}

Returns
`Runnable`	the created Runnable

Artifact: androidx.core:core-ktx

View Source

Added in 1.9.0

inline fun Menu.removeItemAt(index: Int): Unit

Removes the menu item at the specified index.

Throws
`kotlin.IndexOutOfBoundsException`	if index is less than 0 or greater than or equal to the count.

setMargins

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline fun ViewGroup.MarginLayoutParams.setMargins(size: @Px Int): Unit

Sets the margins in the ViewGroup's MarginLayoutParams. This version of the method sets all axes to the provided size.

See also
`setMargins`

setPadding

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline fun View.setPadding(size: @Px Int): Unit

Sets the view's padding. This version of the method sets all axes to the provided size.

See also
`setPadding`

updateLayoutParams

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline fun View.updateLayoutParams(block: ViewGroup.LayoutParams.() -> Unit): Unit

Executes block with the View's layoutParams and reassigns the layoutParams with the updated version.

Throws
`kotlin.NullPointerException`	If no `LayoutParams` is set on the view.

See also
`getLayoutParams`
`setLayoutParams`

updateLayoutParams

Artifact: androidx.core:core-ktx

View Source

inline fun <T : ViewGroup.LayoutParams> View.updateLayoutParams(block: T.() -> Unit): Unit

Executes block with a typed version of the View's layoutParams and reassigns the layoutParams with the updated version.

Throws
`kotlin.NullPointerException`	If no `LayoutParams` is set on the view.
`kotlin.ClassCastException`	If the `LayoutParams` type is not `T` or a subtype of `T`.

See also
`getLayoutParams`
`setLayoutParams`

updateMargins

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline fun ViewGroup.MarginLayoutParams.updateMargins(
    left: @Px Int = leftMargin,
    top: @Px Int = topMargin,
    right: @Px Int = rightMargin,
    bottom: @Px Int = bottomMargin
): Unit

Updates the margins in the ViewGroup's ViewGroup.MarginLayoutParams. This version of the method allows using named parameters to just set one or more axes.

See also
`setMargins`

updateMarginsRelative

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline fun ViewGroup.MarginLayoutParams.updateMarginsRelative(
    start: @Px Int = marginStart,
    top: @Px Int = topMargin,
    end: @Px Int = marginEnd,
    bottom: @Px Int = bottomMargin
): Unit

Updates the relative margins in the ViewGroup's MarginLayoutParams. This version of the method allows using named parameters to just set one or more axes.

Note that this inline method references platform APIs added in API 17 and may raise runtime verification warnings on earlier platforms. See Chromium's guide to Class Verification Failures for more information.

See also
`setMargins`

updatePadding

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline fun View.updatePadding(
    left: @Px Int = paddingLeft,
    top: @Px Int = paddingTop,
    right: @Px Int = paddingRight,
    bottom: @Px Int = paddingBottom
): Unit

Updates this view's padding. This version of the method allows using named parameters to just set one or more axes.

See also
`setPadding`

updatePaddingRelative

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

inline fun View.updatePaddingRelative(
    start: @Px Int = paddingStart,
    top: @Px Int = paddingTop,
    end: @Px Int = paddingEnd,
    bottom: @Px Int = paddingBottom
): Unit

Updates this view's relative padding. This version of the method allows using named parameters to just set one or more axes.

See also
`setPaddingRelative`

Extension properties

allViews

Artifact: androidx.core:core-ktx

View Source

Added in 1.5.0

val View.allViews: Sequence<View>

Returns a Sequence over this view and its descendants recursively. This is a depth-first traversal similar to View.findViewById. A view with no children will return a single-element sequence of itself.

See also
`descendants`

ancestors

Artifact: androidx.core:core-ktx

View Source

Added in 1.5.0

val View.ancestors: Sequence<ViewParent>

Returns a Sequence of the parent chain of this view by repeatedly calling View.getParent. An unattached view will return a zero-element sequence.

See also
`descendants`

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

val Menu.children: Sequence<MenuItem>

Returns a Sequence over the items in this menu.

children

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

val ViewGroup.children: Sequence<View>

Returns a Sequence over the immediate child views in this view group.

See also
`allViews`
`descendants`

descendants

Artifact: androidx.core:core-ktx

View Source

Added in 1.5.0

val ViewGroup.descendants: Sequence<View>

Returns a Sequence over the child views in this view group recursively.

This performs a depth-first traversal. A view with no children will return a zero-element sequence.

For example, to efficiently filter views within the hierarchy using a predicate:

fun ViewGroup.findViewTreeIterator(predicate: (View) -> Boolean): Sequence<View> {
    return sequenceOf(this)
        .plus(descendantsTree)
        .filter { predicate(it) }
}

See also
`allViews`
`children`
`ancestors`

indices

Artifact: androidx.core:core-ktx

View Source

Added in 1.8.0

val ViewGroup.indices: IntRange

Returns an IntRange of the valid indices for the children of this view group.

This can be used for looping:

for (i in viewGroup.indices.reversed) {
  if (viewGroup[i] is SomeView) {
    viewGroup.removeViewAt(i)
  }
}

Or to determine if an index is valid:

if (2 in viewGroup.indices) {
  // Do something…
}

isGone

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

var View.isGone: Boolean

Returns true when this view's visibility is View.GONE, false otherwise.

if (view.isGone) {
    // Behavior...
}

Setting this property to true sets the visibility to View.GONE, false to View.VISIBLE.

view.isGone = true

isInvisible

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

var View.isInvisible: Boolean

Returns true when this view's visibility is View.INVISIBLE, false otherwise.

if (view.isInvisible) {
    // Behavior...
}

Setting this property to true sets the visibility to View.INVISIBLE, false to View.VISIBLE.

view.isInvisible = true

isVisible

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

var View.isVisible: Boolean

Returns true when this view's visibility is View.VISIBLE, false otherwise.

if (view.isVisible) {
    // Behavior...
}

Setting this property to true sets the visibility to View.VISIBLE, false to View.GONE.

view.isVisible = true

marginBottom

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

val View.marginBottom: Int

Returns the bottom margin if this view's ViewGroup.LayoutParams is a ViewGroup.MarginLayoutParams, otherwise 0.

See also
`ViewGroup.MarginLayoutParams`

marginEnd

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

val View.marginEnd: Int

Returns the end margin if this view's ViewGroup.LayoutParams is a ViewGroup.MarginLayoutParams, otherwise 0.

See also
`getMarginEnd`

marginLeft

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

val View.marginLeft: Int

Returns the left margin if this view's ViewGroup.LayoutParams is a ViewGroup.MarginLayoutParams, otherwise 0.

See also
`ViewGroup.MarginLayoutParams`

marginRight

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

val View.marginRight: Int

Returns the right margin if this view's ViewGroup.LayoutParams is a ViewGroup.MarginLayoutParams, otherwise 0.

See also
`ViewGroup.MarginLayoutParams`

marginStart

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

val View.marginStart: Int

Returns the start margin if this view's ViewGroup.LayoutParams is a ViewGroup.MarginLayoutParams, otherwise 0.

See also
`getMarginStart`

marginTop

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

val View.marginTop: Int

Returns the top margin if this view's ViewGroup.LayoutParams is a ViewGroup.MarginLayoutParams, otherwise 0.

See also
`ViewGroup.MarginLayoutParams`

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

val Menu.size: Int

Returns the number of items in this menu.

size

Artifact: androidx.core:core-ktx

View Source

Added in 1.1.0

val ViewGroup.size: Int

Returns the number of views in this view group.