UsbDevice


public class UsbDevice
extends Object implements Parcelable

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


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 UsbInterfaces, each of which contains a number of UsbEndpoints (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. UsbDeviceConnection#controlTransfer is used for control requests on endpoint zero.

Developer Guides

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

Summary

Inherited constants

Fields

public static final Creator<UsbDevice> CREATOR

Public methods

int describeContents()

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

boolean equals(Object o)

Indicates whether some other object is "equal to" this one.

UsbConfiguration getConfiguration(int index)

Returns the UsbConfiguration at the given index.

int getConfigurationCount()

Returns the number of UsbConfigurations this device contains.

int getDeviceClass()

Returns the devices's class field.

int getDeviceId()

Returns a unique integer ID for the device.

static int getDeviceId(String name)
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 UsbInterfaces this device contains.

String getManufacturerName()

Returns the manufacturer name of the device.

int getProductId()

Returns a product ID for the device.

String getProductName()

Returns the product name of the device.

String getSerialNumber()

Returns the serial number of the device.

int getVendorId()

Returns a vendor ID for the device.

String getVersion()

Returns the version number of the device.

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<UsbDevice> 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 o)

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
o Object: This value may be null.

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

getConfiguration

Added in API level 21
public UsbConfiguration getConfiguration (int index)

Returns the UsbConfiguration at the given index.

Parameters
index int

Returns
UsbConfiguration the configuration This value cannot be null.

getConfigurationCount

Added in API level 21
public int getConfigurationCount ()

Returns the number of UsbConfigurations this device contains.

Returns
int the number of configurations

getDeviceClass

Added in API level 12
public int getDeviceClass ()

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

Returns
int the devices's class

getDeviceId

Added in API level 12
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
int the device ID

getDeviceId

Added in API level 12
public static int getDeviceId (String name)

Parameters
name String

Returns
int

getDeviceName

Added in API level 12
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
String the device name This value cannot be null.

getDeviceName

Added in API level 12
public static String getDeviceName (int id)

Parameters
id int

Returns
String

getDeviceProtocol

Added in API level 12
public int getDeviceProtocol ()

Returns the device's protocol field.

Returns
int the device's protocol

getDeviceSubclass

Added in API level 12
public int getDeviceSubclass ()

Returns the device's subclass field.

Returns
int the device's subclass

getInterface

Added in API level 12
public UsbInterface getInterface (int index)

Returns the UsbInterface at the given index. For devices with multiple configurations, you will probably want to use UsbConfiguration#getInterface instead.

Parameters
index int

Returns
UsbInterface the interface This value cannot be null.

getInterfaceCount

Added in API level 12
public int getInterfaceCount ()

Returns the number of UsbInterfaces this device contains. For devices with multiple configurations, you will probably want to use UsbConfiguration#getInterfaceCount instead.

Returns
int the number of interfaces

getManufacturerName

Added in API level 21
public String getManufacturerName ()

Returns the manufacturer name of the device.

Returns
String the manufacturer name, or null if the property could not be read

getProductId

Added in API level 12
public int getProductId ()

Returns a product ID for the device.

Returns
int the device product ID

getProductName

Added in API level 21
public String getProductName ()

Returns the product name of the device.

Returns
String the product name, or null if the property could not be read

getSerialNumber

Added in API level 21
public String getSerialNumber ()

Returns the serial number of the device.

Returns
String the serial number name, or null if the property could not be read

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

getVendorId

Added in API level 12
public int getVendorId ()

Returns a vendor ID for the device.

Returns
int the device vendor ID

getVersion

Added in API level 23
public String getVersion ()

Returns the version number of the device.

Returns
String the device version This value cannot be null.

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