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Summary: Inherited Constants | Fields | Ctors | Methods | Inherited Methods

# ComponentName

`public final class ComponentName`
`extends Object` `implements Parcelable, Cloneable, Comparable<ComponentName>`

java.lang.Object
↳ | android.content.ComponentName

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

### Inherited constants
From interface `android.os.Parcelable`
`int` | `CONTENTS_FILE_DESCRIPTOR` Descriptor bit used with `describeContents()`: indicates that the Parcelable object's flattened representation includes a file descriptor.
`int` | `PARCELABLE_WRITE_RETURN_VALUE` Flag for use with `writeToParcel(Parcel, int)`: the object being written is a return value, that is the result of a function such as "`Parcelable someFunction()`", "`void someFunction(out Parcelable)`", or "`void someFunction(inout Parcelable)`".

### Fields
`public static final Creator<ComponentName>` | `CREATOR`

### 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(android.os.Parcel, int)`.

### Public methods
`ComponentName` | `clone()` Creates and returns a copy of this object.
`int` | `compareTo(ComponentName that)`
`static ComponentName` | `createRelative(String pkg, String cls)` Create a new component identifier where the class name may be specified as either absolute or relative to the containing package.
`static ComponentName` | `createRelative(Context pkg, String cls)` Create a new component identifier where the class name may be specified as either absolute or relative to the containing package.
`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. Two components are considered to be equal if the packages in which they reside have the same name, and if the classes that implement each component also have the same name.
`String` | `flattenToShortString()` The same 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 a hash code value for the object.
`static ComponentName` | `readFromParcel(Parcel in)` Read a ComponentName from a Parcel that was previously written with `writeToParcel(android.content.ComponentName, android.os.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 representation of the 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.

### 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 timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.
From interface `android.os.Parcelable`
`abstract int` | `describeContents()` Describe the kinds of special objects contained in this Parcelable instance's marshaled representation.
`abstract void` | `writeToParcel(Parcel dest, int flags)` Flatten this object in to a Parcel.
From interface `java.lang.Comparable`
`abstract int` | `compareTo(ComponentName o)` Compares this object with the specified object for order.

## Fields

### CREATOR

    public static final Creator<ComponentName> CREATOR

## Public constructors

### ComponentName

    public ComponentName (String pkg,
                    String cls)

Create a new component identifier.

Parameters
`pkg` | `String`: The name of the package that the component exists in. Can not be null. This value cannot be `null`.
`cls` | `String`: The name of the class inside of pkg that implements the component. Can not be null. This value cannot be `null`.

### ComponentName

    public ComponentName (Context pkg,
                    String cls)

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

Parameters
`pkg` | `Context`: A Context for the package implementing the component, from which the actual package name will be retrieved. This value cannot be `null`.
`cls` | `String`: The name of the class inside of pkg that implements the component. This value cannot be `null`.

### ComponentName

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

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

Parameters
`pkg` | `Context`: A Context for the package implementing the component, from which the actual package name will be retrieved. This value cannot be `null`.
`cls` | `Class`: The Class object of the desired component, from which the actual class name will be retrieved. This value cannot be `null`.

### ComponentName

    public ComponentName (Parcel in)

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

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

## Public methods

### clone

    public ComponentName clone ()

Creates and returns a copy of this object. The precise meaning of "copy" may depend on the class of the object. The general intent is that, for any object `x`, the expression:

>      x.clone() != x

will be true, and that the expression:

>      x.clone().getClass() == x.getClass()

will be `true`, but these are not absolute requirements. While it is typically the case that:

>      x.clone().equals(x)

will be `true`, this is not an absolute requirement.

By convention, the returned object should be obtained by calling `super.clone`. If a class and all of its superclasses (except `Object`) obey this convention, it will be the case that `x.clone().getClass() == x.getClass()`.

By convention, the object returned by this method should be independent of this object (which is being cloned). To achieve this independence, it may be necessary to modify one or more fields of the object returned by `super.clone` before returning it. Typically, this means copying any mutable objects that comprise the internal "deep structure" of the object being cloned and replacing the references to these objects with references to the copies. If a class contains only primitive fields or references to immutable objects, then it is usually the case that no fields in the object returned by `super.clone` need to be modified.

The method `clone` for class `Object` performs a specific cloning operation. First, if the class of this object does not implement the interface `Cloneable`, then a `CloneNotSupportedException` is thrown. Note that all arrays are considered to implement the interface `Cloneable` and that the return type of the `clone` method of an array type `T[]` is `T[]` where T is any reference or primitive type. Otherwise, this method creates a new instance of the class of this object and initializes all its fields with exactly the contents of the corresponding fields of this object, as if by assignment; the contents of the fields are not themselves cloned. Thus, this method performs a "shallow copy" of this object, not a "deep copy" operation.

The class `Object` does not itself implement the interface `Cloneable`, so calling the `clone` method on an object whose class is `Object` will result in throwing an exception at run time.

Returns
`ComponentName` | a clone of this instance.

### compareTo

    public int compareTo (ComponentName that)

Parameters
`that` | `ComponentName`

Returns
`int` |

### createRelative

    public static ComponentName createRelative (String pkg,
                    String cls)

Create a new component identifier where the class name may be specified as either absolute or relative to the containing package.

Relative package names begin with a `'.'` character. For a package `"com.example"` and class name `".app.MyActivity"` this method will return a ComponentName with the package `"com.example"`and class name `"com.example.app.MyActivity"`. Fully qualified class names are also permitted.

Parameters
`pkg` | `String`: the name of the package the component exists in This value cannot be `null`.
`cls` | `String`: the name of the class inside of pkg that implements the component This value cannot be `null`.

Returns
`ComponentName` | the new ComponentName This value cannot be `null`.

### createRelative

    public static ComponentName createRelative (Context pkg,
                    String cls)

Create a new component identifier where the class name may be specified as either absolute or relative to the containing package.

Relative package names begin with a `'.'` character. For a package `"com.example"` and class name `".app.MyActivity"` this method will return a ComponentName with the package `"com.example"`and class name `"com.example.app.MyActivity"`. Fully qualified class names are also permitted.

Parameters
`pkg` | `Context`: a Context for the package implementing the component This value cannot be `null`.
`cls` | `String`: the name of the class inside of pkg that implements the component This value cannot be `null`.

Returns
`ComponentName` | the new ComponentName This value cannot be `null`.

### describeContents

    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

    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.

Two components are considered to be equal if the packages in which they reside have the same name, and if the classes that implement each component also have the same name.

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.

### flattenToShortString

    public String flattenToShortString ()

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

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

See also:

- `unflattenFromString(String)`

### flattenToString

    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(java.lang.String)`.

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

See also:

- `unflattenFromString(String)`

### getClassName

    public String getClassName ()

Return the class name of this component.

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

### getPackageName

    public String getPackageName ()

Return the package name of this component.

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

### getShortClassName

    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.

Returns
`String` |

### 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. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the Java™ programming language.)

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

### readFromParcel

    public static ComponentName readFromParcel (Parcel in)

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

Parameters
`in` | `Parcel`: The Parcel from which to read the ComponentName

Returns
`ComponentName` | Returns a new ComponentName matching the previously written object, or null if a null had been written.

See also:

- `writeToParcel(ComponentName, Parcel)`

### toShortString

    public String toShortString ()

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

Returns
`String` |

### toString

    public String toString ()

Returns a string representation of the object. In general, the `toString` method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.

The `toString` method for class `Object` returns a string consisting of the name of the class of which the object is an instance, the at-sign character ``@`', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:

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

Returns
`String` | a string representation of the object.

### unflattenFromString

    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` | `String`: The String that was returned by flattenToString(). This value cannot be `null`.

Returns
`ComponentName` | Returns a new ComponentName containing the package and class names that were encoded in str This value may be `null`.

See also:

- `flattenToString()`

### writeToParcel

    public static void writeToParcel (ComponentName c,
                    Parcel out)

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

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

See also:

- `readFromParcel(Parcel)`

### writeToParcel

    public void writeToParcel (Parcel out,
                    int flags)

Flatten this object in to a Parcel.

Parameters
`out` | `Parcel`: The Parcel in which the object should be written.
`flags` | `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

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