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Signature

public class Signature
extends Object implements Parcelable

java.lang.Object
   ↳ android.content.pm.Signature


Opaque, immutable representation of a signing certificate associated with an application package.

This class name is slightly misleading, since it's not actually a signature.

Summary

Inherited constants

From interface android.os.Parcelable

Fields

public static final Creator<Signature> CREATOR

Public constructors

Signature(byte[] signature)

Create Signature from an existing raw byte array.

Signature(String text)

Create Signature from a text representation previously returned by toChars() or toCharsString().

Public methods

int describeContents()

Describe the kinds of special objects contained in this Parcelable instance's marshaled representation.

boolean equals(Object obj)

Indicates whether some other object is "equal to" this one.

int hashCode()

Returns a hash code value for the object.

byte[] toByteArray()
char[] toChars()

Encode the Signature as ASCII text.

char[] toChars(char[] existingArray, int[] outLen)

Encode the Signature as ASCII text in to an existing array.

String toCharsString()

Return the result of toChars() as a String.

void writeToParcel(Parcel dest, int parcelableFlags)

Flatten this object in to a Parcel.

Inherited methods

From class java.lang.Object
From interface android.os.Parcelable

Fields

CREATOR

Added in API level 1
Creator<Signature> CREATOR

Public constructors

Signature

Added in API level 1
Signature (byte[] signature)

Create Signature from an existing raw byte array.

Parameters
signature byte

Signature

Added in API level 1
Signature (String text)

Create Signature from a text representation previously returned by toChars() or toCharsString(). Signatures are expected to be a hex-encoded ASCII string.

Parameters
text String: hex-encoded string representing the signature
Throws
IllegalArgumentException when signature is odd-length

Public methods

describeContents

Added in API level 1
int describeContents ()

Describe the kinds of special objects contained in this Parcelable instance's marshaled representation. For example, if the object will include a file descriptor in the output of writeToParcel(Parcel, int), the return value of this method must include the CONTENTS_FILE_DESCRIPTOR bit.

Returns
int a bitmask indicating the set of special object types marshaled by this Parcelable object instance.

equals

Added in API level 1
boolean equals (Object obj)

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

  • It is reflexive: for any non-null reference value x, x.equals(x) should return true.
  • It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
  • It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
  • It is consistent: for any non-null reference values 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.
  • For any non-null reference value 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
obj Object: the reference object with which to compare.
Returns
boolean true if this object is the same as the obj argument; false otherwise.

hashCode

Added in API level 1
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 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.
  • If two objects are equal according to the equals(Object) method, then calling the hashCode 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 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.

toByteArray

Added in API level 1
byte[] toByteArray ()

Returns
byte[] the contents of this signature as a byte array.

toChars

Added in API level 1
char[] toChars ()

Encode the Signature as ASCII text.

Returns
char[]

toChars

Added in API level 1
char[] toChars (char[] existingArray, 
                int[] outLen)

Encode the Signature as ASCII text in to an existing array.

Parameters
existingArray char: Existing char array or null.
outLen int: Output parameter for the number of characters written in to the array.
Returns
char[] Returns either existingArray if it was large enough to hold the ASCII representation, or a newly created char[] array if needed.

toCharsString

Added in API level 1
String toCharsString ()

Return the result of toChars() as a String.

Returns
String

writeToParcel

Added in API level 1
void writeToParcel (Parcel dest, 
                int parcelableFlags)

Flatten this object in to a Parcel.

Parameters
dest Parcel: The Parcel in which the object should be written.
parcelableFlags int: Additional flags about how the object should be written. May be 0 or PARCELABLE_WRITE_RETURN_VALUE.
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