public
static
class
GridLayout.LayoutParams
extends ViewGroup.MarginLayoutParams
| java.lang.Object | |||
| ↳ | android.view.ViewGroup.LayoutParams | ||
| ↳ | android.view.ViewGroup.MarginLayoutParams | ||
| ↳ | android.support.v7.widget.GridLayout.LayoutParams | ||
Layout information associated with each of the children of a GridLayout.
GridLayout supports both row and column spanning and arbitrary forms of alignment within
each cell group. The fundamental parameters associated with each cell group are
gathered into their vertical and horizontal components and stored
in the rowSpec and columnSpec layout parameters.
Specs are immutable structures
and may be shared between the layout parameters of different children.
The row and column specs contain the leading and trailing indices along each axis and together specify the four grid indices that delimit the cells of this cell group.
The alignment properties of the row and column specs together specify
both aspects of alignment within the cell group. It is also possible to specify a child's
alignment within its cell group by using the setGravity(int)
method.
The weight property is also included in Spec and specifies the proportion of any excess space that is due to the associated view.
Developers
width and height
properties are both WRAP_CONTENT, this value never needs to be explicitly
declared in the layout parameters of GridLayout's children. In addition,
GridLayout does not distinguish the special size value MATCH_PARENT from
WRAP_CONTENT. A component's ability to expand to the size of the parent is
instead controlled by the principle of flexibility,
as discussed in GridLayout.
WRAP_CONTENT or MATCH_PARENT when configuring the children of
a GridLayout.
width = WRAP_CONTENTheight = WRAP_CONTENTtopMargin = 0 when
useDefaultMargins is
false; otherwise UNDEFINED, to
indicate that a default value should be computed on demand. leftMargin = 0 when
useDefaultMargins is
false; otherwise UNDEFINED, to
indicate that a default value should be computed on demand. bottomMargin = 0 when
useDefaultMargins is
false; otherwise UNDEFINED, to
indicate that a default value should be computed on demand. rightMargin = 0 when
useDefaultMargins is
false; otherwise UNDEFINED, to
indicate that a default value should be computed on demand. rowSpec.row = UNDEFINED rowSpec.rowSpan = 1 rowSpec.alignment = BASELINE rowSpec.weight = 0 columnSpec.column = UNDEFINED columnSpec.columnSpan = 1 columnSpec.alignment = START columnSpec.weight = 0 GridLayout for a more complete description of the conventions
used by GridLayout in the interpretation of the properties of this class.
Inherited XML attributes | |
|---|---|
 From
class
android.view.ViewGroup.MarginLayoutParams
| |
From
class
android.view.ViewGroup.LayoutParams
| |
Inherited constants |
|---|
From
class
android.view.ViewGroup.LayoutParams
|
Fields | |
|---|---|
public
GridLayout.Spec |
columnSpec
The spec that defines the horizontal characteristics of the cell group described by these layout parameters. |
public
GridLayout.Spec |
rowSpec
The spec that defines the vertical characteristics of the cell group described by these layout parameters. |
Inherited fields |
|---|
From
class
android.view.ViewGroup.MarginLayoutParams
|
From
class
android.view.ViewGroup.LayoutParams
|
Public constructors | |
|---|---|
GridLayout.LayoutParams(GridLayout.Spec rowSpec, GridLayout.Spec columnSpec)
Constructs a new LayoutParams instance for this |
|
GridLayout.LayoutParams()
Constructs a new LayoutParams with default values as defined in |
|
GridLayout.LayoutParams(ViewGroup.LayoutParams params)
|
|
GridLayout.LayoutParams(ViewGroup.MarginLayoutParams params)
|
|
GridLayout.LayoutParams(GridLayout.LayoutParams source)
Copy constructor. |
|
GridLayout.LayoutParams(Context context, AttributeSet attrs)
Values not defined in the attribute set take the default values
defined in |
|
Public methods | |
|---|---|
boolean
|
equals(Object o)
Indicates whether some other object is "equal to" this one. |
int
|
hashCode()
Returns a hash code value for the object. |
void
|
setGravity(int gravity)
Describes how the child views are positioned. |
Protected methods | |
|---|---|
void
|
setBaseAttributes(TypedArray attributes, int widthAttr, int heightAttr)
Extracts the layout parameters from the supplied attributes. |
Inherited methods | |
|---|---|
From
class
android.view.ViewGroup.MarginLayoutParams
| |
From
class
android.view.ViewGroup.LayoutParams
| |
From
class
java.lang.Object
| |
GridLayout.Spec columnSpec
The spec that defines the horizontal characteristics of the cell group
described by these layout parameters.
If an assignment is made to this field after a measurement or layout operation
has already taken place, a call to
setLayoutParams(ViewGroup.LayoutParams)
must be made to notify GridLayout of the change. GridLayout is normally able
to detect when code fails to observe this rule, issue a warning and take steps to
compensate for the omission. This facility is implemented on a best effort basis
and should not be relied upon in production code - so it is best to include the above
calls to remove the warnings as soon as it is practical.
GridLayout.Spec rowSpec
The spec that defines the vertical characteristics of the cell group
described by these layout parameters.
If an assignment is made to this field after a measurement or layout operation
has already taken place, a call to
setLayoutParams(ViewGroup.LayoutParams)
must be made to notify GridLayout of the change. GridLayout is normally able
to detect when code fails to observe this rule, issue a warning and take steps to
compensate for the omission. This facility is implemented on a best effort basis
and should not be relied upon in production code - so it is best to include the above
calls to remove the warnings as soon as it is practical.
GridLayout.LayoutParams (GridLayout.Spec rowSpec, GridLayout.Spec columnSpec)
Constructs a new LayoutParams instance for this rowSpec
and columnSpec. All other fields are initialized with
default values as defined in GridLayout.LayoutParams.
| Parameters | |
|---|---|
rowSpec |
GridLayout.Spec:
the rowSpec |
columnSpec |
GridLayout.Spec:
the columnSpec
|
GridLayout.LayoutParams ()
Constructs a new LayoutParams with default values as defined in GridLayout.LayoutParams.
GridLayout.LayoutParams (ViewGroup.LayoutParams params)
| Parameters | |
|---|---|
params |
ViewGroup.LayoutParams
|
GridLayout.LayoutParams (ViewGroup.MarginLayoutParams params)
| Parameters | |
|---|---|
params |
ViewGroup.MarginLayoutParams
|
GridLayout.LayoutParams (GridLayout.LayoutParams source)
Copy constructor. Clones the width, height, margin values, row spec, and column spec of the source.
| Parameters | |
|---|---|
source |
GridLayout.LayoutParams:
The layout params to copy from.
|
GridLayout.LayoutParams (Context context, AttributeSet attrs)
Values not defined in the attribute set take the default values
defined in GridLayout.LayoutParams.
| Parameters | |
|---|---|
context |
Context
|
attrs |
AttributeSet
|
boolean equals (Object o)
Indicates whether some other object is "equal to" this one.
The equals method implements an equivalence relation
on non-null object references:
x, x.equals(x) should return
true.
x and y, x.equals(y)
should return true if and only if
y.equals(x) returns true.
x, y, and z, if
x.equals(y) returns true and
y.equals(z) returns true, then
x.equals(z) should return true.
x and y, multiple invocations of
x.equals(y) consistently return true
or consistently return false, provided no
information used in equals comparisons on the
objects is modified.
x,
x.equals(null) should return false.
The equals method for class Object implements
the most discriminating possible equivalence relation on objects;
that is, for any non-null reference values x and
y, this method returns true if and only
if x and y refer to the same object
(x == y has the value true).
Note that it is generally necessary to override the hashCode
method whenever this method is overridden, so as to maintain the
general contract for the hashCode method, which states
that equal objects must have equal hash codes.
| Parameters | |
|---|---|
o |
Object:
the reference object with which to compare. |
| Returns | |
|---|---|
boolean |
true if this object is the same as the obj
argument; false otherwise. |
int hashCode ()
Returns a hash code value for the object. This method is
supported for the benefit of hash tables such as those provided by
HashMap.
The general contract of hashCode is:
hashCode method
must consistently return the same integer, provided no information
used in equals comparisons on the object is modified.
This integer need not remain consistent from one execution of an
application to another execution of the same application.
equals(Object)
method, then calling the hashCode method on each of
the two objects must produce the same integer result.
equals(java.lang.Object)
method, then calling the hashCode method on each of the
two objects must produce distinct integer results. However, the
programmer should be aware that producing distinct integer results
for unequal objects may improve the performance of hash tables.
As much as is reasonably practical, the hashCode method defined by
class Object does return distinct integers for distinct
objects. (This is typically implemented by converting the internal
address of the object into an integer, but this implementation
technique is not required by the
JavaTM programming language.)
| Returns | |
|---|---|
int |
a hash code value for this object. |
void setGravity (int gravity)
Describes how the child views are positioned. Default is LEFT | BASELINE.
See Gravity.
| Parameters | |
|---|---|
gravity |
int:
the new gravity value |
void setBaseAttributes (TypedArray attributes, int widthAttr, int heightAttr)
Extracts the layout parameters from the supplied attributes.
| Parameters | |
|---|---|
attributes |
TypedArray:
the style attributes to extract the parameters from |
widthAttr |
int:
the identifier of the width attribute |
heightAttr |
int:
the identifier of the height attribute
|