ViewKt

public static final void doOnAttach(
    @NonNull View receiver,
    @NonNull Function1<@NonNull View, Unit> action
)

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.

public static final void doOnDetach(
    @NonNull View receiver,
    @NonNull Function1<@NonNull View, Unit> action
)

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.

public static final void doOnLayout(
    @NonNull View receiver,
    @NonNull Function1<@NonNull View, Unit> action
)

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.

public static final void doOnNextLayout(
    @NonNull View receiver,
    @NonNull Function1<@NonNull View, Unit> action
)

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.

public static final @NonNull OneShotPreDrawListener doOnPreDraw(
    @NonNull View receiver,
    @NonNull Function1<@NonNull View, Unit> action
)

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.

public static final @NonNull Bitmap drawToBitmap(@NonNull View receiver, @NonNull Bitmap.Config config)

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.

public static final @NonNull Sequence<@NonNull View> getAllViews(@NonNull View receiver)

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.

public static final @NonNull Sequence<@NonNull ViewParent> getAncestors(@NonNull View receiver)

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

public static final int getMarginBottom(@NonNull View receiver)

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

public static final int getMarginEnd(@NonNull View receiver)

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

public static final int getMarginLeft(@NonNull View receiver)

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

public static final int getMarginRight(@NonNull View receiver)

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

public static final int getMarginStart(@NonNull View receiver)

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

public static final int getMarginTop(@NonNull View receiver)

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

public static final boolean isGone(@NonNull View receiver)

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

public static final boolean isInvisible(@NonNull View receiver)

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

public static final boolean isVisible(@NonNull View receiver)

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

public static final @NonNull Runnable postDelayed(
    @NonNull View receiver,
    long delayInMillis,
    @NonNull Function0<Unit> action
)

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

view.postDelayed(200) {
    doSomething()
}

public static final @NonNull Runnable postOnAnimationDelayed(
    @NonNull View receiver,
    long delayInMillis,
    @NonNull Function0<Unit> action
)

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

view.postOnAnimationDelayed(16) {
    doSomething()
}

public static final void setGone(@NonNull View receiver, boolean isGone)

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

public static final void setInvisible(@NonNull View receiver, boolean isInvisible)

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

public static final void setPadding(@NonNull View receiver, @Px int size)

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

public static final void setVisible(@NonNull View receiver, boolean isVisible)

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

public static final void updateLayoutParams(
    @NonNull View receiver,
    @NonNull Function1<@NonNull ViewGroup.LayoutParams, Unit> block
)

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

public static final void <T extends ViewGroup.LayoutParams> updateLayoutParamsTyped(
    @NonNull View receiver,
    @NonNull Function1<@NonNull T, Unit> block
)

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

public static final void updatePadding(
    @NonNull View receiver,
    @Px int left,
    @Px int top,
    @Px int right,
    @Px int bottom
)

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

public static final void updatePaddingRelative(
    @NonNull View receiver,
    @Px int start,
    @Px int top,
    @Px int end,
    @Px int bottom
)

Updates this view's relative padding. 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.