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Android Reference

ViewGroup.LayoutParams

android.view

Class ViewGroup.LayoutParams

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

Direct Known Subclasses:

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

Enclosing class:

ViewGroup
```
public static class ViewGroup.LayoutParams
extends Object
```
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.

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`FILL_PARENT` Deprecated.
`int`	`height` Information about how tall the view wants to be.
`LayoutAnimationController.AnimationParameters`	`layoutAnimationParameters` Used to animate layouts.
`static int`	`MATCH_PARENT` Special value for the height or width requested by a View.
`int`	`width` Information about how wide the view wants to be.
`static int`	`WRAP_CONTENT` Special value for the height or width requested by a View.

Constructor Summary

Constructors
Constructor and Description
`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.

Method Summary

Methods
Modifier and Type	Method and Description
`String`	`debug(String output)` Returns a String representation of this set of layout parameters.
`void`	`onDebugDraw(View view, Canvas canvas)` Use `canvas` to draw suitable debugging annotations for these LayoutParameters.
`void`	`resolveLayoutDirection(int layoutDirection)` Resolve layout parameters depending on the layout direction.
`protected void`	`setBaseAttributes(TypedArray a, int widthAttr, int heightAttr)` Extracts the layout parameters from the supplied attributes.
`protected static String`	`sizeToString(int size)` Converts the specified size to a readable String.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - FILL_PARENT
```
@Deprecated
public static final int FILL_PARENT
```
    Deprecated.
    
    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.
    
    See Also:
    Constant Field Values
  - MATCH_PARENT
```
public static final 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.
    
    See Also:
    Constant Field Values
  - WRAP_CONTENT
```
public static final 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.
    
    See Also:
    Constant Field Values
  - width
```
public 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.
  - height
```
public 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
```
public LayoutAnimationController.AnimationParameters layoutAnimationParameters
```
    Used to animate layouts.
- Constructor Detail
  - ViewGroup.LayoutParams
```
public ViewGroup.LayoutParams(Context c,
                      AttributeSet attrs)
```
    Creates a new set of layout parameters. The values are extracted from the supplied attributes set and context. The XML attributes mapped to this set of layout parameters are:
    - layout_width: the width, either an exact value, WRAP_CONTENT, or FILL_PARENT (replaced by MATCH_PARENT in API Level 8)
    - layout_height: the height, either an exact value, WRAP_CONTENT, or FILL_PARENT (replaced by MATCH_PARENT in API Level 8)
    Parameters:
    c - the application environment
    attrs - the set of attributes from which to extract the layout parameters' values
  - ViewGroup.LayoutParams
```
public ViewGroup.LayoutParams(int width,
                      int height)
```
    Creates a new set of layout parameters with the specified width and height.
    
    Parameters:
    width - the width, either WRAP_CONTENT, FILL_PARENT (replaced by MATCH_PARENT in API Level 8), or a fixed size in pixels
    height - the height, either WRAP_CONTENT, FILL_PARENT (replaced by MATCH_PARENT in API Level 8), or a fixed size in pixels
  - ViewGroup.LayoutParams
```
public ViewGroup.LayoutParams(ViewGroup.LayoutParams source)
```
    Copy constructor. Clones the width and height values of the source.
    
    Parameters:
    source - The layout params to copy from.
- Method Detail
  - setBaseAttributes
```
protected void setBaseAttributes(TypedArray a,
                     int widthAttr,
                     int heightAttr)
```
    Extracts the layout parameters from the supplied attributes.
    
    Parameters:
    a - the style attributes to extract the parameters from
    widthAttr - the identifier of the width attribute
    heightAttr - the identifier of the height attribute
  - resolveLayoutDirection
```
public void resolveLayoutDirection(int layoutDirection)
```
    Resolve layout parameters depending on the layout direction. Subclasses that care about layoutDirection changes should override this method. The default implementation does nothing.
    
    Parameters:
    layoutDirection - the direction of the layout View.LAYOUT_DIRECTION_LTR View.LAYOUT_DIRECTION_RTL
  - debug
```
public String debug(String output)
```
    Returns a String representation of this set of layout parameters.
    
    Parameters:
    output - the String to prepend to the internal representation
    
    Returns:
    a String with the following format: output + "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }"
  - onDebugDraw
```
public void onDebugDraw(View view,
               Canvas canvas)
```
    Use canvas to draw suitable debugging annotations for these LayoutParameters.
    
    Parameters:
    view - the view that contains these layout parameters
    canvas - the canvas on which to draw
  - sizeToString
```
protected static String sizeToString(int size)
```
    Converts the specified size to a readable String.
    
    Parameters:
    size - the size to convert
    
    Returns:
    a String instance representing the supplied size

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IT. Expert System.

Android Reference

ViewGroup.LayoutParams

Class ViewGroup.LayoutParams

Developer Guides

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

FILL_PARENT

MATCH_PARENT

WRAP_CONTENT

width

height

layoutAnimationParameters

Constructor Detail

ViewGroup.LayoutParams

ViewGroup.LayoutParams

ViewGroup.LayoutParams

Method Detail

setBaseAttributes

resolveLayoutDirection

debug

onDebugDraw

sizeToString

Android Reference

Java basics

Java Enterprise Edition (EE)

Java Standard Edition (SE)

SQL

HTML

PHP

CSS

Java Script

MYSQL

JQUERY

VBS

REGEX

C

C++

C#

Design patterns

RFC (standard status)

RFC (proposed standard status)

RFC (draft standard status)

RFC (informational status)

RFC (experimental status)

RFC (best current practice status)

RFC (historic status)

RFC (unknown status)

IT dictionary