PackageIdentifier

Summary: Ctors | Methods | Inherited Methods

public class PackageIdentifier
extends Object

This class represents a uniquely identifiable package.

Summary

Public constructors
`PackageIdentifier(String packageName, byte[] sha256Certificate)` Creates a unique identifier for a package.

Public methods
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`String`	`getPackageName()`
`byte[]`	`getSha256Certificate()`
`int`	`hashCode()` Returns a hash code value for the object.

Inherited methods

From class java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeoutMillis, int nanos)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

Public constructors

public PackageIdentifier (String packageName, 
                byte[] sha256Certificate)

Creates a unique identifier for a package.

SHA-256 certificate digests for a signed application can be retrieved with the apksigner tool that is part of the Android SDK build tools. Use apksigner verify --print-certs path/to/apk.apk to retrieve the SHA-256 certificate digest for the target application. Once retrieved, the SHA-256 certificate digest should be converted to a byte[] by decoding it in base16:

 new android.content.pm.Signature(outputDigest).toByteArray();

Parameters
`packageName`	`String`: Name of the package. This value cannot be `null`.
`sha256Certificate`	`byte`: SHA-256 certificate digest of the package. This value cannot be `null`.

Public methods

equals

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.

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`: This value may be `null`.

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

getPackageName

public String getPackageName ()

Returns
`String`	This value cannot be `null`.

getSha256Certificate

public byte[] getSha256Certificate ()

Returns
`byte[]`	This value cannot be `null`.

hashCode

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(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. (The hashCode may or may not be implemented as some function of an object's memory address at some point in time.)

Returns
`int`	a hash code value for this object.