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Shader

public class Shader
extends Object

java.lang.Object
   ↳ android.graphics.Shader
Known Direct Subclasses


Shader is the based class for objects that return horizontal spans of colors during drawing. A subclass of Shader is installed in a Paint calling paint.setShader(shader). After that any object (other than a bitmap) that is drawn with that paint will get its color(s) from the shader.

Summary

Nested classes

enum Shader.TileMode

 

Public constructors

Shader()

Public methods

boolean getLocalMatrix(Matrix localM)

Return true if the shader has a non-identity local matrix.

void setLocalMatrix(Matrix localM)

Set the shader's local matrix.

Protected methods

void finalize()

Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.

Inherited methods

From class java.lang.Object

Public constructors

Shader

Added in API level 1
Shader ()

Public methods

getLocalMatrix

Added in API level 1
boolean getLocalMatrix (Matrix localM)

Return true if the shader has a non-identity local matrix.

Parameters
localM Matrix: If not null, it is set to the shader's local matrix.
Returns
boolean true if the shader has a non-identity local matrix

setLocalMatrix

Added in API level 1
void setLocalMatrix (Matrix localM)

Set the shader's local matrix. Passing null will reset the shader's matrix to identity.

Parameters
localM Matrix: The shader's new local matrix, or null to specify identity

Protected methods

finalize

Added in API level 1
void finalize ()

Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. A subclass overrides the finalize method to dispose of system resources or to perform other cleanup.

The general contract of finalize is that it is invoked if and when the JavaTM virtual machine has determined that there is no longer any means by which this object can be accessed by any thread that has not yet died, except as a result of an action taken by the finalization of some other object or class which is ready to be finalized. The finalize method may take any action, including making this object available again to other threads; the usual purpose of finalize, however, is to perform cleanup actions before the object is irrevocably discarded. For example, the finalize method for an object that represents an input/output connection might perform explicit I/O transactions to break the connection before the object is permanently discarded.

The finalize method of class Object performs no special action; it simply returns normally. Subclasses of Object may override this definition.

The Java programming language does not guarantee which thread will invoke the finalize method for any given object. It is guaranteed, however, that the thread that invokes finalize will not be holding any user-visible synchronization locks when finalize is invoked. If an uncaught exception is thrown by the finalize method, the exception is ignored and finalization of that object terminates.

After the finalize method has been invoked for an object, no further action is taken until the Java virtual machine has again determined that there is no longer any means by which this object can be accessed by any thread that has not yet died, including possible actions by other objects or classes which are ready to be finalized, at which point the object may be discarded.

The finalize method is never invoked more than once by a Java virtual machine for any given object.

Any exception thrown by the finalize method causes the finalization of this object to be halted, but is otherwise ignored.

Throws
Throwable
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