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Added in API level 1

ViewGroup.LayoutParams

public static class ViewGroup.LayoutParams
extends Object

java.lang.Object
↳	android.view.ViewGroup.LayoutParams

Known Direct Subclasses

AbsListView.LayoutParams, AbsoluteLayout.LayoutParams, Gallery.LayoutParams, ViewGroup.MarginLayoutParams, ViewPager.LayoutParams, WindowManager.LayoutParams

Known Indirect Subclasses

ActionBar.LayoutParams, ActionMenuView.LayoutParams, AppBarLayout.LayoutParams, BaseCardView.LayoutParams, CollapsingToolbarLayout.LayoutParams, CoordinatorLayout.LayoutParams, DrawerLayout.LayoutParams, FrameLayout.LayoutParams, GridLayout.LayoutParams, GridLayoutManager.LayoutParams, LinearLayout.LayoutParams, LinearLayoutCompat.LayoutParams, PercentFrameLayout.LayoutParams, PercentRelativeLayout.LayoutParams, and 7 others.

LayoutParams are used by views to tell their parents how they want to be laid out. See ViewGroup Layout Attributes for a list of all child view attributes that this class supports.

The base LayoutParams class just describes how big the view wants to be for both width and height. For each dimension, it can specify one of:

FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which means that the view wants to be as big as its parent (minus padding)
WRAP_CONTENT, which means that the view wants to be just big enough to enclose its content (plus padding)
an exact number

There are subclasses of LayoutParams for different subclasses of ViewGroup. For example, AbsoluteLayout has its own subclass of LayoutParams which adds an X and Y value.

Developer Guides

For more information about creating user interface layouts, read the XML Layouts developer guide.

Summary

XML attributes
`android:layout_height`	Specifies the basic height of the view.
`android:layout_width`	Specifies the basic width of the view.

Constants
`int`	`FILL_PARENT` Special value for the height or width requested by a View.
`int`	`MATCH_PARENT` Special value for the height or width requested by a View.
`int`	`WRAP_CONTENT` Special value for the height or width requested by a View.

Fields
`public int`	`height` Information about how tall the view wants to be.
`public LayoutAnimationController.AnimationParameters`	`layoutAnimationParameters` Used to animate layouts.
`public int`	`width` Information about how wide the view wants to be.

Public constructors
`ViewGroup.LayoutParams(Context c, AttributeSet attrs)` Creates a new set of layout parameters.
`ViewGroup.LayoutParams(int width, int height)` Creates a new set of layout parameters with the specified width and height.
`ViewGroup.LayoutParams(ViewGroup.LayoutParams source)` Copy constructor.

Public methods
`void`	`resolveLayoutDirection(int layoutDirection)` Resolve layout parameters depending on the layout direction.

Protected methods
`void`	`setBaseAttributes(TypedArray a, int widthAttr, int heightAttr)` Extracts the layout parameters from the supplied attributes.

Inherited methods

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 millis, 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 millis)` 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.

XML attributes

android:layout_height

Specifies the basic height of the view. This is a required attribute for any view inside of a containing layout manager. Its value may be a dimension (such as "12dip") for a constant height or one of the special constants.

May be a dimension value, which is a floating point number appended with a unit such as "14.5sp". Available units are: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size), in (inches), mm (millimeters).

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.

May be one of the following constant values.

Constant	Value	Description
`fill_parent`	-1	The view should be as big as its parent (minus padding). This constant is deprecated starting from API Level 8 and is replaced by `match_parent`.
`match_parent`	-1	The view should be as big as its parent (minus padding). Introduced in API Level 8.
`wrap_content`	-2	The view should be only big enough to enclose its content (plus padding).

This corresponds to the global attribute resource symbol layout_height.

android:layout_width

Specifies the basic width of the view. This is a required attribute for any view inside of a containing layout manager. Its value may be a dimension (such as "12dip") for a constant width or one of the special constants.

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.

May be one of the following constant values.

Constant	Value	Description
`fill_parent`	-1	The view should be as big as its parent (minus padding). This constant is deprecated starting from API Level 8 and is replaced by `match_parent`.
`match_parent`	-1	The view should be as big as its parent (minus padding). Introduced in API Level 8.
`wrap_content`	-2	The view should be only big enough to enclose its content (plus padding).

This corresponds to the global attribute resource symbol layout_width.

Constants

FILL_PARENT

Added in API level 1

int FILL_PARENT

Special value for the height or width requested by a View. FILL_PARENT means that the view wants to be as big as its parent, minus the parent's padding, if any. This value is deprecated starting in API Level 8 and replaced by MATCH_PARENT.

Constant Value: -1 (0xffffffff)

MATCH_PARENT

Added in API level 8

int MATCH_PARENT

Special value for the height or width requested by a View. MATCH_PARENT means that the view wants to be as big as its parent, minus the parent's padding, if any. Introduced in API Level 8.

Constant Value: -1 (0xffffffff)

WRAP_CONTENT

Added in API level 1

int WRAP_CONTENT

Special value for the height or width requested by a View. WRAP_CONTENT means that the view wants to be just large enough to fit its own internal content, taking its own padding into account.

Constant Value: -2 (0xfffffffe)

Fields

height

Added in API level 1

int height

Information about how tall the view wants to be. Can be one of the constants FILL_PARENT (replaced by MATCH_PARENT in API Level 8) or WRAP_CONTENT, or an exact size.

layoutAnimationParameters

Added in API level 1

LayoutAnimationController.AnimationParameters layoutAnimationParameters

Used to animate layouts.

width

Added in API level 1

int width

Information about how wide the view wants to be. Can be one of the constants FILL_PARENT (replaced by MATCH_PARENT in API Level 8) or WRAP_CONTENT, or an exact size.

Public constructors