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

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

Fields

CREATOR

Added in API level 1
public static final Creator<Signature> CREATOR

Public constructors

Signature

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

Create Signature from an existing raw byte array.

Parameters
signature byte

Signature

Added in API level 1
public 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
public 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(android.os.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. Value is either 0 or CONTENTS_FILE_DESCRIPTOR

equals

Added in API level 1
public 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.

An equivalence relation partitions the elements it operates on into equivalence classes; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes.

Parameters
obj Object: This value may be null.

Returns
boolean true if this object is the same as the obj argument; false otherwise.

hashCode

Added in API level 1
public 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 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 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.

Returns
int a hash code value for this object.

toByteArray

Added in API level 1
public byte[] toByteArray ()

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

toChars

Added in API level 1
public char[] toChars ()

Encode the Signature as ASCII text.

Returns
char[]

toChars

Added in API level 1
public 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
public String toCharsString ()

Return the result of toChars() as a String.

Returns
String

writeToParcel

Added in API level 1
public 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. This value cannot be null.

parcelableFlags int: Additional flags about how the object should be written. May be 0 or Parcelable.PARCELABLE_WRITE_RETURN_VALUE. Value is either 0 or a combination of Parcelable.PARCELABLE_WRITE_RETURN_VALUE, and android.os.Parcelable.PARCELABLE_ELIDE_DUPLICATES