FingerprintGestureController
class FingerprintGestureController
kotlin.Any | |
↳ | android.accessibilityservice.FingerprintGestureController |
An AccessibilityService
can capture gestures performed on a device's fingerprint sensor, as long as the device has a sensor capable of detecting gestures.
This capability must be declared by the service as AccessibilityServiceInfo#CAPABILITY_CAN_REQUEST_FINGERPRINT_GESTURES
. It also requires the permission android.Manifest.permission#USE_FINGERPRINT
.
Because capturing fingerprint gestures may have side effects, services with the capability only capture gestures when AccessibilityServiceInfo#FLAG_REQUEST_FINGERPRINT_GESTURES
is set.
Note: The fingerprint sensor is used for authentication in critical use cases, so services must carefully design their user's experience when performing gestures on the sensor. When the sensor is in use by an app, for example, when authenticating or enrolling a user, the sensor will not detect gestures. Services need to ensure that users understand when the sensor is in-use for authentication to prevent users from authenticating unintentionally when trying to interact with the service. They can use FingerprintGestureCallback#onGestureDetectionAvailabilityChanged(boolean)
to learn when gesture detection becomes unavailable.
Multiple accessibility services may listen for fingerprint gestures simultaneously, so services should provide a way for the user to disable the use of this feature so multiple services don't conflict with each other.
{@see android.hardware.fingerprint.FingerprintManager#isHardwareDetected}
Summary
Nested classes | |
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abstract |
Class that is called back when fingerprint gestures are being used for accessibility. |
Constants | |
---|---|
static Int |
Identifier for a swipe down on the fingerprint sensor |
static Int |
Identifier for a swipe left on the fingerprint sensor |
static Int |
Identifier for a swipe right on the fingerprint sensor |
static Int |
Identifier for a swipe up on the fingerprint sensor |
Public methods | |
---|---|
Boolean |
Gets if the fingerprint sensor's gesture detection is available. |
Unit |
registerFingerprintGestureCallback(callback: FingerprintGestureController.FingerprintGestureCallback, handler: Handler?) Register a callback to be informed of fingerprint sensor gesture events. |
Unit |
unregisterFingerprintGestureCallback(callback: FingerprintGestureController.FingerprintGestureCallback!) Unregister a listener added with |
Constants
FINGERPRINT_GESTURE_SWIPE_DOWN
static val FINGERPRINT_GESTURE_SWIPE_DOWN: Int
Identifier for a swipe down on the fingerprint sensor
Value: 8
FINGERPRINT_GESTURE_SWIPE_LEFT
static val FINGERPRINT_GESTURE_SWIPE_LEFT: Int
Identifier for a swipe left on the fingerprint sensor
Value: 2
FINGERPRINT_GESTURE_SWIPE_RIGHT
static val FINGERPRINT_GESTURE_SWIPE_RIGHT: Int
Identifier for a swipe right on the fingerprint sensor
Value: 1
FINGERPRINT_GESTURE_SWIPE_UP
static val FINGERPRINT_GESTURE_SWIPE_UP: Int
Identifier for a swipe up on the fingerprint sensor
Value: 4
Public methods
isGestureDetectionAvailable
fun isGestureDetectionAvailable(): Boolean
Gets if the fingerprint sensor's gesture detection is available.
Return | |
---|---|
Boolean |
true if the sensor's gesture detection is available. false if it is not currently detecting gestures (for example, if it is enrolling a finger). |
registerFingerprintGestureCallback
fun registerFingerprintGestureCallback(
callback: FingerprintGestureController.FingerprintGestureCallback,
handler: Handler?
): Unit
Register a callback to be informed of fingerprint sensor gesture events.
Parameters | |
---|---|
callback |
FingerprintGestureController.FingerprintGestureCallback: The listener to be added. This value cannot be null . |
handler |
Handler?: The handler to use for the callback. If null , callbacks will happen on the service's main thread. |
unregisterFingerprintGestureCallback
fun unregisterFingerprintGestureCallback(callback: FingerprintGestureController.FingerprintGestureCallback!): Unit
Unregister a listener added with registerFingerprintGestureCallback
.
Parameters | |
---|---|
callback |
FingerprintGestureController.FingerprintGestureCallback!: The callback to remove. Removing a callback that was never added has no effect. |