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Summary: Nested Classes | Methods | Inherited Methods

AccessibilityService.MagnificationController

public static final class AccessibilityService.MagnificationController
extends Object

java.lang.Object
↳	android.accessibilityservice.AccessibilityService.MagnificationController

Used to control and query the state of display magnification.

Summary

Nested classes
`interface`	`AccessibilityService.MagnificationController.OnMagnificationChangedListener` Listener for changes in the state of magnification.

Public methods
`void`	`addListener(AccessibilityService.MagnificationController.OnMagnificationChangedListener listener, Handler handler)` Adds the specified change listener to the list of magnification change listeners.
`void`	`addListener(AccessibilityService.MagnificationController.OnMagnificationChangedListener listener)` Adds the specified change listener to the list of magnification change listeners.
`float`	`getCenterX()` Returns the unscaled screen-relative X coordinate of the focal center of the magnified region.
`float`	`getCenterY()` Returns the unscaled screen-relative Y coordinate of the focal center of the magnified region.
`Region`	`getMagnificationRegion()` Returns the region of the screen currently active for magnification.
`float`	`getScale()` Returns the current magnification scale.
`boolean`	`removeListener(AccessibilityService.MagnificationController.OnMagnificationChangedListener listener)` Removes the specified change listener from the list of magnification change listeners.
`boolean`	`reset(boolean animate)` Resets magnification scale and center to their default (e.g. no magnification) values.
`boolean`	`setCenter(float centerX, float centerY, boolean animate)` Sets the center of the magnified viewport.
`boolean`	`setScale(float scale, boolean animate)` Sets the magnification scale.

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 timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void`	`wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void`	`wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.

Public methods

addListener

public void addListener (AccessibilityService.MagnificationController.OnMagnificationChangedListener listener, 
                Handler handler)

Adds the specified change listener to the list of magnification change listeners. The callback will occur on the specified Handler's thread, or on the service's main thread if the handler is null.

Parameters
`listener`	`AccessibilityService.MagnificationController.OnMagnificationChangedListener`: the listener to add, must be non-null This value cannot be `null`.
`handler`	`Handler`: the handler on which the callback should execute, or `null` to execute on the service's main thread This value may be `null`.

addListener

public void addListener (AccessibilityService.MagnificationController.OnMagnificationChangedListener listener)

Adds the specified change listener to the list of magnification change listeners. The callback will occur on the service's main thread.

Parameters
`listener`	`AccessibilityService.MagnificationController.OnMagnificationChangedListener`: the listener to add, must be non-`null` This value cannot be `null`.

getCenterX

public float getCenterX ()

Returns the unscaled screen-relative X coordinate of the focal center of the magnified region. This is the point around which zooming occurs and is guaranteed to lie within the magnified region.

Note: If the service is not yet connected (e.g. AccessibilityService#onServiceConnected() has not yet been called) or the service has been disconnected, this method will return a default value of 0.0f.

Returns
`float`	the unscaled screen-relative X coordinate of the center of the magnified region

getCenterY

public float getCenterY ()

Returns the unscaled screen-relative Y coordinate of the focal center of the magnified region. This is the point around which zooming occurs and is guaranteed to lie within the magnified region.

Returns
`float`	the unscaled screen-relative Y coordinate of the center of the magnified region

getMagnificationRegion

public Region getMagnificationRegion ()

Returns the region of the screen currently active for magnification. Changes to magnification scale and center only affect this portion of the screen. The rest of the screen, for example input methods, cannot be magnified. This region is relative to the unscaled screen and is independent of the scale and center point.

The returned region will be empty if magnification is not active. Magnification is active if magnification gestures are enabled or if a service is running that can control magnification.

Note: If the service is not yet connected (e.g. AccessibilityService#onServiceConnected() has not yet been called) or the service has been disconnected, this method will return an empty region.

Returns
`Region`	the region of the screen currently active for magnification, or an empty region if magnification is not active. This value cannot be `null`.

getScale

public float getScale ()

Returns the current magnification scale.

Returns
`float`	the current magnification scale

removeListener

public boolean removeListener (AccessibilityService.MagnificationController.OnMagnificationChangedListener listener)

Removes the specified change listener from the list of magnification change listeners.

Parameters
`listener`	`AccessibilityService.MagnificationController.OnMagnificationChangedListener`: the listener to remove, must be non-null This value cannot be `null`.

Returns
`boolean`	`true` if the listener was removed, `false` otherwise

reset

public boolean reset (boolean animate)

Resets magnification scale and center to their default (e.g. no magnification) values.

Parameters
`animate`	`boolean`: `true` to animate from the current scale and center or `false` to reset the scale and center immediately

Returns
`boolean`	`true` on success, `false` on failure

setCenter

public boolean setCenter (float centerX, 
                float centerY, 
                boolean animate)

Sets the center of the magnified viewport.

Parameters
`centerX`	`float`: the unscaled screen-relative X coordinate on which to center the viewport
`centerY`	`float`: the unscaled screen-relative Y coordinate on which to center the viewport
`animate`	`boolean`: `true` to animate from the current viewport center or `false` to set the center immediately

Returns
`boolean`	`true` on success, `false` on failure

setScale

public boolean setScale (float scale, 
                boolean animate)

Sets the magnification scale.

Parameters
`scale`	`float`: the magnification scale to set, must be >= 1 and <= 8
`animate`	`boolean`: `true` to animate from the current scale or `false` to set the scale immediately

Returns
`boolean`	`true` on success, `false` on failure

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AccessibilityService.MagnificationController

Summary

Nested classes

Public methods

Inherited methods

Public methods

addListener

addListener

getCenterX

getCenterY

getMagnificationRegion

getScale

removeListener

reset

setCenter

setScale