UsbManager

ACTION_USB_ACCESSORY_ATTACHED

static val ACTION_USB_ACCESSORY_ATTACHED: String

Activity intent sent when user attaches a USB accessory.

• EXTRA_ACCESSORY containing the android.hardware.usb.UsbAccessory for the attached accessory

Value: "android.hardware.usb.action.USB_ACCESSORY_ATTACHED"

ACTION_USB_ACCESSORY_DETACHED

static val ACTION_USB_ACCESSORY_DETACHED: String

Broadcast Action: A broadcast for USB accessory detached event. This intent is sent when a USB accessory is detached.

• EXTRA_ACCESSORY containing the UsbAccessory for the attached accessory that was detached

Value: "android.hardware.usb.action.USB_ACCESSORY_DETACHED"

ACTION_USB_DEVICE_ATTACHED

static val ACTION_USB_DEVICE_ATTACHED: String

Activity intent sent when user attaches a USB device. This intent is sent when a USB device is attached to the USB bus when in host mode.

• EXTRA_DEVICE containing the android.hardware.usb.UsbDevice for the attached device

Value: "android.hardware.usb.action.USB_DEVICE_ATTACHED"

ACTION_USB_DEVICE_DETACHED

static val ACTION_USB_DEVICE_DETACHED: String

Broadcast Action: A broadcast for USB device detached event. This intent is sent when a USB device is detached from the USB bus when in host mode.

• EXTRA_DEVICE containing the android.hardware.usb.UsbDevice for the detached device

Value: "android.hardware.usb.action.USB_DEVICE_DETACHED"

EXTRA_ACCESSORY

static val EXTRA_ACCESSORY: String

Name of extra for ACTION_USB_ACCESSORY_ATTACHED and ACTION_USB_ACCESSORY_DETACHED broadcasts containing the UsbAccessory object for the accessory.

Value: "accessory"

EXTRA_DEVICE

static val EXTRA_DEVICE: String

Name of extra for ACTION_USB_DEVICE_ATTACHED and ACTION_USB_DEVICE_DETACHED broadcasts containing the UsbDevice object for the device.

Value: "device"

EXTRA_PERMISSION_GRANTED

static val EXTRA_PERMISSION_GRANTED: String

Name of extra added to the android.app.PendingIntent passed into requestPermission(android.hardware.usb.UsbDevice,android.app.PendingIntent) or requestPermission(android.hardware.usb.UsbAccessory,android.app.PendingIntent) containing a boolean value indicating whether the user granted permission or not.

Value: "permission"

getAccessoryList

open fun getAccessoryList(): Array<UsbAccessory!>!

Returns a list of currently attached USB accessories. (in the current implementation there can be at most one)
Requires the PackageManager#FEATURE_USB_ACCESSORY feature which can be detected using PackageManager.hasSystemFeature(String).

getDeviceList

open fun getDeviceList(): HashMap<String!, UsbDevice!>!

Returns a HashMap containing all USB devices currently attached. USB device name is the key for the returned HashMap. The result will be empty if no devices are attached, or if USB host mode is inactive or unsupported.
Requires the PackageManager#FEATURE_USB_HOST feature which can be detected using PackageManager.hasSystemFeature(String).

hasPermission

open fun hasPermission(accessory: UsbAccessory!): Boolean

Returns true if the caller has permission to access the accessory. Permission might have been granted temporarily via requestPermission(android.hardware.usb.UsbAccessory,android.app.PendingIntent) or by the user choosing the caller as the default application for the accessory.
Requires the PackageManager#FEATURE_USB_ACCESSORY feature which can be detected using PackageManager.hasSystemFeature(String).

hasPermission

open fun hasPermission(device: UsbDevice!): Boolean

Returns true if the caller has permission to access the device. Permission might have been granted temporarily via requestPermission(android.hardware.usb.UsbDevice,android.app.PendingIntent) or by the user choosing the caller as the default application for the device. Permission for USB devices of class UsbConstants.USB_CLASS_VIDEO for clients that target SDK android.os.Build.VERSION_CODES#P and above can be granted only if they have additionally the android.Manifest.permission#CAMERA permission.
Requires the PackageManager#FEATURE_USB_HOST feature which can be detected using PackageManager.hasSystemFeature(String).

openAccessory

open fun openAccessory(accessory: UsbAccessory!): ParcelFileDescriptor!

Opens a file descriptor for reading and writing data to the USB accessory.

If data is read from the java.io.InputStream created from this file descriptor all data of a USB transfer should be read at once. If only a partial request is read the rest of the transfer is dropped.

It is strongly recommended to use newer methods instead of this method, since this method may provide sub-optimal performance on some devices. This method could potentially face interim performance degradation as well.
Requires the PackageManager#FEATURE_USB_ACCESSORY feature which can be detected using PackageManager.hasSystemFeature(String).

openDevice

open fun openDevice(device: UsbDevice!): UsbDeviceConnection!

Opens the device so it can be used to send and receive data using android.hardware.usb.UsbRequest.
Requires the PackageManager#FEATURE_USB_HOST feature which can be detected using PackageManager.hasSystemFeature(String).

requestPermission

open fun requestPermission(
    accessory: UsbAccessory!, 
    pi: PendingIntent!
): Unit

Requests temporary permission for the given package to access the accessory. This may result in a system dialog being displayed to the user if permission had not already been granted. Success or failure is returned via the android.app.PendingIntent pi. If successful, this grants the caller permission to access the accessory only until the device is disconnected. The following extras will be added to pi:

• EXTRA_ACCESSORY containing the accessory passed into this call
• EXTRA_PERMISSION_GRANTED containing boolean indicating whether permission was granted by the user

requestPermission

open fun requestPermission(
    device: UsbDevice!, 
    pi: PendingIntent!
): Unit

Requests temporary permission for the given package to access the device. This may result in a system dialog being displayed to the user if permission had not already been granted. Success or failure is returned via the android.app.PendingIntent pi. If successful, this grants the caller permission to access the device only until the device is disconnected. The following extras will be added to pi:

• EXTRA_DEVICE containing the device passed into this call
• EXTRA_PERMISSION_GRANTED containing boolean indicating whether permission was granted by the user