Summary: Nested Classes | Constants | Methods | Inherited Methods

TouchInteractionController

public final class TouchInteractionController
extends Object

java.lang.Object
↳	android.accessibilityservice.TouchInteractionController

This class allows a service to handle touch exploration and the detection of specialized accessibility gestures. The service receives motion events and can match those motion events against the gestures it supports. The service can also request the framework enter three other states of operation for the duration of this interaction. Upon entering any of these states the framework will take over and the service will not receive motion events until the start of a new interaction. The states are as follows:

The service can tell the framework that this interaction is touch exploration. The user is trying to explore the screen rather than manipulate it. The framework will then convert the motion events to hover events to support touch exploration.
The service can tell the framework that this interaction is a dragging interaction where two fingers are used to execute a one-finger gesture such as scrolling the screen. The service must specify which of the two fingers should be passed through to rest of the input pipeline.
Finally, the service can request that the framework delegate this interaction, meaning pass it through to the rest of the input pipeline as-is.

When AccessibilityServiceInfo.FLAG_REQUEST_TOUCH_EXPLORATION_MODE is enabled, this controller will receive all motion events received by the framework for the specified display when not touch-exploring or delegating. If the service classifies this interaction as touch exploration or delegating the framework will stop sending motion events to the service for the duration of this interaction. If the service classifies this interaction as a dragging interaction the framework will send motion events to the service to allow the service to determine if the interaction still qualifies as dragging or if it has become a delegating interaction. If AccessibilityServiceInfo.FLAG_REQUEST_TOUCH_EXPLORATION_MODE is disabled this controller will not receive any motion events because touch interactions are being passed through to the input pipeline unaltered. Note that AccessibilityServiceInfo.FLAG_REQUEST_TOUCH_EXPLORATION_MODE requires setting R.attr.canRequestTouchExplorationMode as well.

Summary

Nested classes
`interface`	`TouchInteractionController.Callback` callbacks allow services to receive motion events and state change updates.

Constants
`int`	`STATE_CLEAR` The state where the user is not touching the screen.
`int`	`STATE_DELEGATING` The user is performing a gesture which is being passed through to the input pipeline as-is.
`int`	`STATE_DRAGGING` The state where the user is dragging with two fingers.
`int`	`STATE_TOUCH_EXPLORING` The state where the user is explicitly exploring the screen.
`int`	`STATE_TOUCH_INTERACTING` The state where the user is touching the screen and the service is receiving motion events.

Public methods
`int`	`getDisplayId()`
`int`	`getMaxPointerCount()`
`int`	`getState()`
`void`	`performClick()` If `AccessibilityServiceInfo.FLAG_REQUEST_TOUCH_EXPLORATION_MODE` is enabled and at least one callback has been added, this function tells the framework to perform a click.
`void`	`performLongClickAndStartDrag()` If `AccessibilityServiceInfo.FLAG_REQUEST_TOUCH_EXPLORATION_MODE` is enabled and at least one callback has been added, this function tells the framework to perform a long click.
`void`	`registerCallback(Executor executor, TouchInteractionController.Callback callback)` Adds the specified callback to the list of callbacks.
`void`	`requestDelegating()` If `AccessibilityServiceInfo.FLAG_REQUEST_TOUCH_EXPLORATION_MODE` is enabled and at least one callback has been added, this function tells the framework to initiate a delegating interaction.
`void`	`requestDragging(int pointerId)` If `AccessibilityServiceInfo.FLAG_REQUEST_TOUCH_EXPLORATION_MODE` is enabled and at least one callback has been added, this function tells the framework to initiate a dragging interaction using the specified pointer.
`void`	`requestTouchExploration()` If `AccessibilityServiceInfo.FLAG_REQUEST_TOUCH_EXPLORATION_MODE` is enabled and at least one callback has been added for this display this function tells the framework to initiate touch exploration.
`static String`	`stateToString(int state)` Returns a string representation of the specified state.
`void`	`unregisterAllCallbacks()` Removes all callbacks and returns control of touch interactions to the framework.
`boolean`	`unregisterCallback(TouchInteractionController.Callback callback)` Unregisters the specified callback.

Inherited methods

From class java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeoutMillis, int nanos)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

Parameters
`executor`	`Executor`: the executor for this callback, or `null` to execute on the service's main thread
`callback`	`TouchInteractionController.Callback`: the callback to add, must be non-null

TouchInteractionController

Summary

Nested classes

Constants

Public methods

Inherited methods

Constants

STATE_CLEAR

STATE_DELEGATING

STATE_DRAGGING

STATE_TOUCH_EXPLORING

STATE_TOUCH_INTERACTING

Public methods

getDisplayId

getMaxPointerCount

getState

performClick

performLongClickAndStartDrag

registerCallback

requestDelegating

requestDragging

requestTouchExploration

stateToString

unregisterAllCallbacks

unregisterCallback