public final class

ComponentName

extends Object
implements Parcelable
java.lang.Object
   ↳ android.content.ComponentName

Class Overview

Identifier for a specific application component (Activity, Service, BroadcastReceiver, or ContentProvider) that is available. Two pieces of information, encapsulated here, are required to identify a component: the package (a String) it exists in, and the class (a String) name inside of that package.

Summary

Constants
Creator<ComponentName> CREATOR
[Expand]
Inherited Constants
From interface android.os.Parcelable
Public Constructors
ComponentName(String pkg, String cls)
Create a new component identifier.
ComponentName(Context pkg, String cls)
Create a new component identifier from a Context and class name.
ComponentName(Context pkg, Class<?> cls)
Create a new component identifier from a Context and Class object.
ComponentName(Parcel in)
Instantiate a new ComponentName from the data in a Parcel that was previously written with writeToParcel(Parcel, int).
Public Methods
int describeContents()
Describe the kinds of special objects contained in this Parcelable's marshalled representation.
boolean equals(Object obj)
Compares this instance with the specified object and indicates if they are equal.
String flattenToShortString()
The samee as flattenToString(), but abbreviates the class name if it is a suffix of the package.
String flattenToString()
Return a String that unambiguously describes both the package and class names contained in the ComponentName.
String getClassName()
Return the class name of this component.
String getPackageName()
Return the package name of this component.
String getShortClassName()
Return the class name, either fully qualified or in a shortened form (with a leading '.') if it is a suffix of the package.
int hashCode()
Returns an integer hash code for this object.
static ComponentName readFromParcel(Parcel in)
Read a ComponentName from a Parcel that was previously written with writeToParcel(ComponentName, Parcel), returning either a null or new object as appropriate.
String toShortString()
Return string representation of this class without the class's name as a prefix.
String toString()
Returns a string containing a concise, human-readable description of this object.
static ComponentName unflattenFromString(String str)
Recover a ComponentName from a String that was previously created with flattenToString().
static void writeToParcel(ComponentName c, Parcel out)
Write a ComponentName to a Parcel, handling null pointers.
void writeToParcel(Parcel out, int flags)
Flatten this object in to a Parcel.
[Expand]
Inherited Methods
From class java.lang.Object
From interface android.os.Parcelable

Constants

public static final Creator<ComponentName> CREATOR

Public Constructors

public ComponentName (String pkg, String cls)

Create a new component identifier.

Parameters
pkg The name of the package that the component exists in. Can not be null.
cls The name of the class inside of pkg that implements the component. Can not be null.

public ComponentName (Context pkg, String cls)

Create a new component identifier from a Context and class name.

Parameters
pkg A Context for the package implementing the component, from which the actual package name will be retrieved.
cls The name of the class inside of pkg that implements the component.

public ComponentName (Context pkg, Class<?> cls)

Create a new component identifier from a Context and Class object.

Parameters
pkg A Context for the package implementing the component, from which the actual package name will be retrieved.
cls The Class object of the desired component, from which the actual class name will be retrieved.

public ComponentName (Parcel in)

Instantiate a new ComponentName from the data in a Parcel that was previously written with writeToParcel(Parcel, int). Note that you must not use this with data written by writeToParcel(ComponentName, Parcel) since it is not possible to handle a null ComponentObject here.

Parameters
in The Parcel containing the previously written ComponentName, positioned at the location in the buffer where it was written.

Public Methods

public int describeContents ()

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

Returns
  • a bitmask indicating the set of special object types marshalled by the Parcelable.

public boolean equals (Object obj)

Compares this instance with the specified object and indicates if they are equal. In order to be equal, o must represent the same object as this instance using a class-specific comparison. The general contract is that this comparison should be both transitive and reflexive.

The implementation in Object returns true only if o is the exact same object as the receiver (using the == operator for comparison). Subclasses often implement equals(Object) so that it takes into account the two object's types and states.

The general contract for the equals(Object) and hashCode() methods is that if equals returns true for any two objects, then hashCode() must return the same value for these objects. This means that subclasses of Object usually override either both methods or none of them.

Parameters
obj the object to compare this instance with.
Returns
  • true if the specified object is equal to this Object; false otherwise.

public String flattenToShortString ()

The samee as flattenToString(), but abbreviates the class name if it is a suffix of the package. The result can still be used with unflattenFromString(String).

Returns
  • Returns a new String holding the package and class names. This is represented as the package name, concatenated with a '/' and then the class name.

public String flattenToString ()

Return a String that unambiguously describes both the package and class names contained in the ComponentName. You can later recover the ComponentName from this string through unflattenFromString(String).

Returns
  • Returns a new String holding the package and class names. This is represented as the package name, concatenated with a '/' and then the class name.

public String getClassName ()

Return the class name of this component.

public String getPackageName ()

Return the package name of this component.

public String getShortClassName ()

Return the class name, either fully qualified or in a shortened form (with a leading '.') if it is a suffix of the package.

public int hashCode ()

Returns an integer hash code for this object. By contract, any two objects for which equals(Object) returns true must return the same hash code value. This means that subclasses of Object usually override both methods or neither method.

Returns
  • this object's hash code.

public static ComponentName readFromParcel (Parcel in)

Read a ComponentName from a Parcel that was previously written with writeToParcel(ComponentName, Parcel), returning either a null or new object as appropriate.

Parameters
in The Parcel from which to read the ComponentName
Returns
  • Returns a new ComponentName matching the previously written object, or null if a null had been written.

public String toShortString ()

Return string representation of this class without the class's name as a prefix.

public String toString ()

Returns a string containing a concise, human-readable description of this object. Subclasses are encouraged to override this method and provide an implementation that takes into account the object's type and data. The default implementation simply concatenates the class name, the '@' sign and a hexadecimal representation of the object's hashCode(), that is, it is equivalent to the following expression:

 getClass().getName() + '@' + Integer.toHexString(hashCode())
 

Returns
  • a printable representation of this object.

public static ComponentName unflattenFromString (String str)

Recover a ComponentName from a String that was previously created with flattenToString(). It splits the string at the first '/', taking the part before as the package name and the part after as the class name. As a special convenience (to use, for example, when parsing component names on the command line), if the '/' is immediately followed by a '.' then the final class name will be the concatenation of the package name with the string following the '/'. Thus "com.foo/.Blah" becomes package="com.foo" class="com.foo.Blah".

Parameters
str The String that was returned by flattenToString().
Returns
  • Returns a new ComponentName containing the package and class names that were encoded in str

public static void writeToParcel (ComponentName c, Parcel out)

Write a ComponentName to a Parcel, handling null pointers. Must be read with readFromParcel(Parcel).

Parameters
c The ComponentName to be written.
out The Parcel in which the ComponentName will be placed.

public void writeToParcel (Parcel out, int flags)

Flatten this object in to a Parcel.

Parameters
out The Parcel in which the object should be written.
flags Additional flags about how the object should be written. May be 0 or PARCELABLE_WRITE_RETURN_VALUE.