UsbAccessory


public class UsbAccessory
extends Object implements Parcelable

java.lang.Object
   ↳ android.hardware.usb.UsbAccessory


A class representing a USB accessory, which is an external hardware component that communicates with an android application over USB. The accessory is the USB host and android the device side of the USB connection.

When the accessory connects, it reports its manufacturer and model names, the version of the accessory, and a user visible description of the accessory to the device. The manufacturer, model and version strings are used by the USB Manager to choose an appropriate application for the accessory. The accessory may optionally provide a unique serial number and a URL to for the accessory's website to the device as well.

An instance of this class is sent to the application via the UsbManager#ACTION_USB_ACCESSORY_ATTACHED Intent. The application can then call UsbManager#openAccessory to open a file descriptor for reading and writing data to and from the accessory.

Developer Guides

For more information about communicating with USB hardware, read the USB developer guide.

Summary

Inherited constants

Fields

public static final Creator<UsbAccessory> CREATOR

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.

String getDescription()

Returns a user visible description of the accessory.

String getManufacturer()

Returns the manufacturer name of the accessory.

String getModel()

Returns the model name of the accessory.

String getSerial()

Returns the unique serial number for the accessory.

String getUri()

Returns the URI for the accessory.

String getVersion()

Returns the version of the accessory.

int hashCode()

Returns a hash code value for the object.

String toString()

Returns a string representation of the object.

void writeToParcel(Parcel parcel, int flags)

Flatten this object in to a Parcel.

Inherited methods

Fields

CREATOR

Added in API level 12
public static final Creator<UsbAccessory> CREATOR

Public methods

describeContents

Added in API level 12
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 12
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.

getDescription

Added in API level 12
public String getDescription ()

Returns a user visible description of the accessory.

Returns
String the accessory description, or null if not set

getManufacturer

Added in API level 12
public String getManufacturer ()

Returns the manufacturer name of the accessory.

Returns
String the accessory manufacturer This value cannot be null.

getModel

Added in API level 12
public String getModel ()

Returns the model name of the accessory.

Returns
String the accessory model This value cannot be null.

getSerial

Added in API level 12
public String getSerial ()

Returns the unique serial number for the accessory. This is an optional serial number that can be used to differentiate between individual accessories of the same model and manufacturer

Returns
String the unique serial number, or null if not set

Throws
SecurityException if the app targets SDK >= android.os.Build.VERSION_CODES.Q and the app does not have permission to read from the accessory.

getUri

Added in API level 12
public String getUri ()

Returns the URI for the accessory. This is an optional URI that might show information about the accessory or provide the option to download an application for the accessory

Returns
String the accessory URI, or null if not set

getVersion

Added in API level 12
public String getVersion ()

Returns the version of the accessory.

Returns
String the accessory version, or null if not set

hashCode

Added in API level 12
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.

toString

Added in API level 12
public String toString ()

Returns a string representation of the object.

Returns
String a string representation of the object.

writeToParcel

Added in API level 12
public void writeToParcel (Parcel parcel, 
                int flags)

Flatten this object in to a Parcel.

Parameters
parcel Parcel: The Parcel in which the object should be written. This value cannot be null.

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