Rect
public
final
class
Rect
extends Object
implements
Parcelable
java.lang.Object  
↳  android.graphics.Rect 
Rect holds four integer coordinates for a rectangle. The rectangle is represented by the coordinates of its 4 edges (left, top, right bottom). These fields can be accessed directly. Use width() and height() to retrieve the rectangle's width and height. Note: most methods do not check to see that the coordinates are sorted correctly (i.e. left <= right and top <= bottom).
Note that the right and bottom coordinates are exclusive. This means a Rect
being drawn untransformed onto a Canvas
will draw
into the column and row described by its left and top coordinates, but not
those of its bottom and right.
Summary
Inherited constants 

Fields  

public
static
final
Creator<Rect> 
CREATOR

public
int 
bottom

public
int 
left

public
int 
right

public
int 
top

Public constructors  

Rect()
Create a new empty Rect. 

Rect(int left, int top, int right, int bottom)
Create a new rectangle with the specified coordinates. 

Rect(Rect r)
Create a new rectangle, initialized with the values in the specified rectangle (which is left unmodified). 
Public methods  

int

centerX()

int

centerY()

boolean

contains(int left, int top, int right, int bottom)
Returns true iff the 4 specified sides of a rectangle are inside or equal to this rectangle. 
boolean

contains(Rect r)
Returns true iff the specified rectangle r is inside or equal to this rectangle. 
boolean

contains(int x, int y)
Returns true if (x,y) is inside the rectangle. 
int

describeContents()
Parcelable interface methods 
boolean

equals(Object o)
Indicates whether some other object is "equal to" this one. 
float

exactCenterX()

float

exactCenterY()

String

flattenToString()
Return a string representation of the rectangle in a welldefined format. 
int

hashCode()
Returns a hash code value for the object. 
int

height()

void

inset(int dx, int dy)
Inset the rectangle by (dx,dy). 
boolean

intersect(int left, int top, int right, int bottom)
If the rectangle specified by left,top,right,bottom intersects this rectangle, return true and set this rectangle to that intersection, otherwise return false and do not change this rectangle. 
boolean

intersect(Rect r)
If the specified rectangle intersects this rectangle, return true and set this rectangle to that intersection, otherwise return false and do not change this rectangle. 
boolean

intersects(int left, int top, int right, int bottom)
Returns true if this rectangle intersects the specified rectangle. 
static
boolean

intersects(Rect a, Rect b)
Returns true iff the two specified rectangles intersect. 
boolean

isEmpty()
Returns true if the rectangle is empty (left >= right or top >= bottom) 
void

offset(int dx, int dy)
Offset the rectangle by adding dx to its left and right coordinates, and adding dy to its top and bottom coordinates. 
void

offsetTo(int newLeft, int newTop)
Offset the rectangle to a specific (left, top) position, keeping its width and height the same. 
void

readFromParcel(Parcel in)
Set the rectangle's coordinates from the data stored in the specified parcel. 
void

set(int left, int top, int right, int bottom)
Set the rectangle's coordinates to the specified values. 
void

set(Rect src)
Copy the coordinates from src into this rectangle. 
void

setEmpty()
Set the rectangle to (0,0,0,0) 
boolean

setIntersect(Rect a, Rect b)
If rectangles a and b intersect, return true and set this rectangle to that intersection, otherwise return false and do not change this rectangle. 
void

sort()
Swap top/bottom or left/right if there are flipped (i.e. 
String

toShortString()
Return a string representation of the rectangle in a compact form. 
String

toString()
Returns a string representation of the object. 
static
Rect

unflattenFromString(String str)
Returns a Rect from a string of the form returned by 
void

union(int left, int top, int right, int bottom)
Update this Rect to enclose itself and the specified rectangle. 
void

union(Rect r)
Update this Rect to enclose itself and the specified rectangle. 
void

union(int x, int y)
Update this Rect to enclose itself and the [x,y] coordinate. 
int

width()

void

writeToParcel(Parcel out, int flags)
Write this rectangle to the specified parcel. 
Inherited methods  

Fields
Public constructors
Rect
Rect (int left, int top, int right, int bottom)
Create a new rectangle with the specified coordinates. Note: no range checking is performed, so the caller must ensure that left <= right and top <= bottom.
Parameters  

left 
int : The X coordinate of the left side of the rectangle 
top 
int : The Y coordinate of the top of the rectangle 
right 
int : The X coordinate of the right side of the rectangle 
bottom 
int : The Y coordinate of the bottom of the rectangle

Rect
Rect (Rect r)
Create a new rectangle, initialized with the values in the specified rectangle (which is left unmodified).
Parameters  

r 
Rect : The rectangle whose coordinates are copied into the new
rectangle.

Public methods
centerX
int centerX ()
Returns  

int 
the horizontal center of the rectangle. If the computed value is fractional, this method returns the largest integer that is less than the computed value. 
centerY
int centerY ()
Returns  

int 
the vertical center of the rectangle. If the computed value is fractional, this method returns the largest integer that is less than the computed value. 
contains
boolean contains (int left, int top, int right, int bottom)
Returns true iff the 4 specified sides of a rectangle are inside or equal to this rectangle. i.e. is this rectangle a superset of the specified rectangle. An empty rectangle never contains another rectangle.
Parameters  

left 
int : The left side of the rectangle being tested for containment 
top 
int : The top of the rectangle being tested for containment 
right 
int : The right side of the rectangle being tested for containment 
bottom 
int : The bottom of the rectangle being tested for containment 
Returns  

boolean 
true iff the the 4 specified sides of a rectangle are inside or equal to this rectangle 
contains
boolean contains (Rect r)
Returns true iff the specified rectangle r is inside or equal to this rectangle. An empty rectangle never contains another rectangle.
Parameters  

r 
Rect : The rectangle being tested for containment. 
Returns  

boolean 
true iff the specified rectangle r is inside or equal to this rectangle 
contains
boolean contains (int x, int y)
Returns true if (x,y) is inside the rectangle. The left and top are considered to be inside, while the right and bottom are not. This means that for a x,y to be contained: left <= x < right and top <= y < bottom. An empty rectangle never contains any point.
Parameters  

x 
int : The X coordinate of the point being tested for containment 
y 
int : The Y coordinate of the point being tested for containment 
Returns  

boolean 
true iff (x,y) are contained by the rectangle, where containment means left <= x < right and top <= y < bottom 
describeContents
int describeContents ()
Parcelable interface methods
Returns  

int 
a bitmask indicating the set of special object types marshaled by this Parcelable object instance. 
equals
boolean equals (Object o)
Indicates whether some other object is "equal to" this one.
The equals
method implements an equivalence relation
on nonnull object references:
 It is reflexive: for any nonnull reference value
x
,x.equals(x)
should returntrue
.  It is symmetric: for any nonnull reference values
x
andy
,x.equals(y)
should returntrue
if and only ify.equals(x)
returnstrue
.  It is transitive: for any nonnull reference values
x
,y
, andz
, ifx.equals(y)
returnstrue
andy.equals(z)
returnstrue
, thenx.equals(z)
should returntrue
.  It is consistent: for any nonnull reference values
x
andy
, multiple invocations ofx.equals(y)
consistently returntrue
or consistently returnfalse
, provided no information used inequals
comparisons on the objects is modified.  For any nonnull reference value
x
,x.equals(null)
should returnfalse
.
The equals
method for class Object
implements
the most discriminating possible equivalence relation on objects;
that is, for any nonnull 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. 
exactCenterX
float exactCenterX ()
Returns  

float 
the exact horizontal center of the rectangle as a float. 
exactCenterY
float exactCenterY ()
Returns  

float 
the exact vertical center of the rectangle as a float. 
flattenToString
String flattenToString ()
Return a string representation of the rectangle in a welldefined format.
You can later recover the Rect from this string through
unflattenFromString(String)
.
Returns  

String 
Returns a new String of the form "left top right bottom" 
hashCode
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:
 Whenever it is invoked on the same object more than once during
an execution of a Java application, the
hashCode
method must consistently return the same integer, provided no information used inequals
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.  If two objects are equal according to the
equals(Object)
method, then calling thehashCode
method on each of the two objects must produce the same integer result.  It is not required that if two objects are unequal
according to the
equals(java.lang.Object)
method, then calling thehashCode
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
Java™ programming language.)
Returns  

int 
a hash code value for this object. 
height
int height ()
Returns  

int 
the rectangle's height. This does not check for a valid rectangle (i.e. top <= bottom) so the result may be negative. 
inset
void inset (int dx, int dy)
Inset the rectangle by (dx,dy). If dx is positive, then the sides are moved inwards, making the rectangle narrower. If dx is negative, then the sides are moved outwards, making the rectangle wider. The same holds true for dy and the top and bottom.
Parameters  

dx 
int : The amount to add(subtract) from the rectangle's left(right) 
dy 
int : The amount to add(subtract) from the rectangle's top(bottom)

intersect
boolean intersect (int left, int top, int right, int bottom)
If the rectangle specified by left,top,right,bottom intersects this
rectangle, return true and set this rectangle to that intersection,
otherwise return false and do not change this rectangle. No check is
performed to see if either rectangle is empty. Note: To just test for
intersection, use intersects(Rect, Rect)
.
Parameters  

left 
int : The left side of the rectangle being intersected with this
rectangle 
top 
int : The top of the rectangle being intersected with this rectangle 
right 
int : The right side of the rectangle being intersected with this
rectangle. 
bottom 
int : The bottom of the rectangle being intersected with this
rectangle. 
Returns  

boolean 
true if the specified rectangle and this rectangle intersect (and this rectangle is then set to that intersection) else return false and do not change this rectangle. 
intersect
boolean intersect (Rect r)
If the specified rectangle intersects this rectangle, return true and set this rectangle to that intersection, otherwise return false and do not change this rectangle. No check is performed to see if either rectangle is empty. To just test for intersection, use intersects()
Parameters  

r 
Rect : The rectangle being intersected with this rectangle. 
Returns  

boolean 
true if the specified rectangle and this rectangle intersect (and this rectangle is then set to that intersection) else return false and do not change this rectangle. 
intersects
boolean intersects (int left, int top, int right, int bottom)
Returns true if this rectangle intersects the specified rectangle. In no event is this rectangle modified. No check is performed to see if either rectangle is empty. To record the intersection, use intersect() or setIntersect().
Parameters  

left 
int : The left side of the rectangle being tested for intersection 
top 
int : The top of the rectangle being tested for intersection 
right 
int : The right side of the rectangle being tested for
intersection 
bottom 
int : The bottom of the rectangle being tested for intersection 
Returns  

boolean 
true iff the specified rectangle intersects this rectangle. In no event is this rectangle modified. 
intersects
boolean intersects (Rect a, Rect b)
Returns true iff the two specified rectangles intersect. In no event are
either of the rectangles modified. To record the intersection,
use intersect(Rect)
or setIntersect(Rect, Rect)
.
Parameters  

a 
Rect : The first rectangle being tested for intersection 
b 
Rect : The second rectangle being tested for intersection 
Returns  

boolean 
true iff the two specified rectangles intersect. In no event are either of the rectangles modified. 
isEmpty
boolean isEmpty ()
Returns true if the rectangle is empty (left >= right or top >= bottom)
Returns  

boolean 
offset
void offset (int dx, int dy)
Offset the rectangle by adding dx to its left and right coordinates, and adding dy to its top and bottom coordinates.
Parameters  

dx 
int : The amount to add to the rectangle's left and right coordinates 
dy 
int : The amount to add to the rectangle's top and bottom coordinates

offsetTo
void offsetTo (int newLeft, int newTop)
Offset the rectangle to a specific (left, top) position, keeping its width and height the same.
Parameters  

newLeft 
int : The new "left" coordinate for the rectangle 
newTop 
int : The new "top" coordinate for the rectangle

readFromParcel
void readFromParcel (Parcel in)
Set the rectangle's coordinates from the data stored in the specified parcel. To write a rectangle to a parcel, call writeToParcel().
Parameters  

in 
Parcel : The parcel to read the rectangle's coordinates from

set
void set (int left, int top, int right, int bottom)
Set the rectangle's coordinates to the specified values. Note: no range checking is performed, so it is up to the caller to ensure that left <= right and top <= bottom.
Parameters  

left 
int : The X coordinate of the left side of the rectangle 
top 
int : The Y coordinate of the top of the rectangle 
right 
int : The X coordinate of the right side of the rectangle 
bottom 
int : The Y coordinate of the bottom of the rectangle

set
void set (Rect src)
Copy the coordinates from src into this rectangle.
Parameters  

src 
Rect : The rectangle whose coordinates are copied into this
rectangle.

setIntersect
boolean setIntersect (Rect a, Rect b)
If rectangles a and b intersect, return true and set this rectangle to that intersection, otherwise return false and do not change this rectangle. No check is performed to see if either rectangle is empty. To just test for intersection, use intersects()
Parameters  

a 
Rect : The first rectangle being intersected with 
b 
Rect : The second rectangle being intersected with 
Returns  

boolean 
true iff the two specified rectangles intersect. If they do, set this rectangle to that intersection. If they do not, return false and do not change this rectangle. 
sort
void sort ()
Swap top/bottom or left/right if there are flipped (i.e. left > right and/or top > bottom). This can be called if the edges are computed separately, and may have crossed over each other. If the edges are already correct (i.e. left <= right and top <= bottom) then nothing is done.
toShortString
String toShortString ()
Return a string representation of the rectangle in a compact form.
Returns  

String 
toString
String toString ()
Returns a string representation of the object. In general, the
toString
method returns a string that
"textually represents" this object. The result should
be a concise but informative representation that is easy for a
person to read.
It is recommended that all subclasses override this method.
The toString
method for class Object
returns a string consisting of the name of the class of which the
object is an instance, the atsign character `@
', and
the unsigned hexadecimal representation of the hash code of the
object. In other words, this method returns a string equal to the
value of:
getClass().getName() + '@' + Integer.toHexString(hashCode())
Returns  

String 
a string representation of the object. 
unflattenFromString
Rect unflattenFromString (String str)
Returns a Rect from a string of the form returned by flattenToString()
,
or null if the string is not of that form.
Parameters  

str 
String 
Returns  

Rect 
union
void union (int left, int top, int right, int bottom)
Update this Rect to enclose itself and the specified rectangle. If the specified rectangle is empty, nothing is done. If this rectangle is empty it is set to the specified rectangle.
Parameters  

left 
int : The left edge being unioned with this rectangle 
top 
int : The top edge being unioned with this rectangle 
right 
int : The right edge being unioned with this rectangle 
bottom 
int : The bottom edge being unioned with this rectangle

union
void union (Rect r)
Update this Rect to enclose itself and the specified rectangle. If the specified rectangle is empty, nothing is done. If this rectangle is empty it is set to the specified rectangle.
Parameters  

r 
Rect : The rectangle being unioned with this rectangle

union
void union (int x, int y)
Update this Rect to enclose itself and the [x,y] coordinate. There is no check to see that this rectangle is nonempty.
Parameters  

x 
int : The x coordinate of the point to add to the rectangle 
y 
int : The y coordinate of the point to add to the rectangle

width
int width ()
Returns  

int 
the rectangle's width. This does not check for a valid rectangle (i.e. left <= right) so the result may be negative. 
writeToParcel
void writeToParcel (Parcel out, int flags)
Write this rectangle to the specified parcel. To restore a rectangle from a parcel, use readFromParcel()
Parameters  

out 
Parcel : The parcel to write the rectangle's coordinates into

flags 
int : Additional flags about how the object should be written.
May be 0 or PARCELABLE_WRITE_RETURN_VALUE .
