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Android APIs
public class

UsbDevice

extends Object
implements Parcelable
java.lang.Object
   ↳ android.hardware.usb.UsbDevice

Class Overview

This class represents a USB device attached to the android device with the android device acting as the USB host. Each device contains one or more UsbInterface s, each of which contains a number of UsbEndpoint s (the channels via which data is transmitted over USB).

This class contains information (along with UsbInterface and UsbEndpoint ) that describes the capabilities of the USB device. To communicate with the device, you open a UsbDeviceConnection for the device and use UsbRequest to send and receive data on an endpoint. controlTransfer(int, int, int, int, byte[], int, int) is used for control requests on endpoint zero.

Developer Guides

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

Summary

[Expand]
Inherited Constants
From interface android.os.Parcelable
Fields
public static final Creator < UsbDevice > CREATOR
Public Methods
int describeContents ()
Describe the kinds of special objects contained in this Parcelable's marshalled representation.
boolean equals ( Object o)
Compares this instance with the specified object and indicates if they are equal.
int getDeviceClass ()
Returns the devices's class field.
static int getDeviceId ( String name)
int getDeviceId ()
Returns a unique integer ID for the device.
String getDeviceName ()
Returns the name of the device.
static String getDeviceName (int id)
int getDeviceProtocol ()
Returns the device's protocol field.
int getDeviceSubclass ()
Returns the device's subclass field.
UsbInterface getInterface (int index)
Returns the UsbInterface at the given index.
int getInterfaceCount ()
Returns the number of UsbInterface s this device contains.
int getProductId ()
Returns a product ID for the device.
int getVendorId ()
Returns a vendor ID for the device.
int hashCode ()
Returns an integer hash code for this object.
String toString ()
Returns a string containing a concise, human-readable description of this object.
void writeToParcel ( Parcel parcel, int flags)
Flatten this object in to a Parcel.
[Expand]
Inherited Methods
From class java.lang.Object
From interface android.os.Parcelable

Fields

public static final Creator < UsbDevice > CREATOR

Added in API level 12

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 o)

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 reflexive, symmetric, and transitive. Also, no object reference other than null is equal to null.

The default implementation returns true only if this == o . See Writing a correct equals method if you intend implementing your own equals method.

The general contract for the equals 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 neither of them.

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

public int getDeviceClass ()

Returns the devices's class field. Some useful constants for USB device classes can be found in UsbConstants .

Returns
  • the devices's class

public static int getDeviceId ( String name)

public int getDeviceId ()

Returns a unique integer ID for the device. This is a convenience for clients that want to use an integer to represent the device, rather than the device name. IDs are not persistent across USB disconnects.

Returns
  • the device ID

public String getDeviceName ()

Returns the name of the device. In the standard implementation, this is the path of the device file for the device in the usbfs file system.

Returns
  • the device name

public static String getDeviceName (int id)

public int getDeviceProtocol ()

Returns the device's protocol field.

Returns
  • the device's protocol

public int getDeviceSubclass ()

Returns the device's subclass field.

Returns
  • the device's subclass

public UsbInterface getInterface (int index)

Returns the UsbInterface at the given index.

Returns
  • the interface

public int getInterfaceCount ()

Returns the number of UsbInterface s this device contains.

Returns
  • the number of interfaces

public int getProductId ()

Returns a product ID for the device.

Returns
  • the device product ID

public int getVendorId ()

Returns a vendor ID for the device.

Returns
  • the device vendor ID

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.

Note that hash values must not change over time unless information used in equals comparisons also changes.

See Writing a correct hashCode method if you intend implementing your own hashCode method.

Returns
  • this object's hash code.

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 is equivalent to the following expression: 

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

See Writing a useful toString method if you intend implementing your own toString method.

Returns
  • a printable representation of this object.

public void writeToParcel ( Parcel parcel, int flags)

Flatten this object in to a Parcel.

Parameters
parcel 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 .