listeners;
synchronized (mLock) {
if (mServicesStateChangeListeners.isEmpty()) {
return;
}
listeners = new ArrayMap<>(mServicesStateChangeListeners);
}
int numListeners = listeners.size();
for (int i = 0; i < numListeners; i++) {
final AccessibilityServicesStateChangeListener listener =
mServicesStateChangeListeners.keyAt(i);
mServicesStateChangeListeners.valueAt(i).post(() -> listener
.onAccessibilityServicesStateChanged(AccessibilityManager.this));
}
}
@Override
public void setRelevantEventTypes(int eventTypes) {
mRelevantEventTypes = eventTypes;
}
};
/**
* Get an AccessibilityManager instance (create one if necessary).
*
* @param context Context in which this manager operates.
*
* @hide
*/
public static AccessibilityManager getInstance(Context context) {
synchronized (sInstanceSync) {
if (sInstance == null) {
final int userId;
if (Binder.getCallingUid() == Process.SYSTEM_UID
|| context.checkCallingOrSelfPermission(
Manifest.permission.INTERACT_ACROSS_USERS)
== PackageManager.PERMISSION_GRANTED
|| context.checkCallingOrSelfPermission(
Manifest.permission.INTERACT_ACROSS_USERS_FULL)
== PackageManager.PERMISSION_GRANTED) {
userId = UserHandle.USER_CURRENT;
} else {
userId = context.getUserId();
}
sInstance = new AccessibilityManager(context, null, userId);
}
}
return sInstance;
}
/**
* Create an instance.
*
* @param context A {@link Context}.
* @param service An interface to the backing service.
* @param userId User id under which to run.
*
* @hide
*/
public AccessibilityManager(Context context, IAccessibilityManager service, int userId) {
// Constructor can't be chained because we can't create an instance of an inner class
// before calling another constructor.
mCallback = new MyCallback();
mHandler = new Handler(context.getMainLooper(), mCallback);
mUserId = userId;
synchronized (mLock) {
tryConnectToServiceLocked(service);
}
}
/**
* Create an instance.
*
* @param handler The handler to use
* @param service An interface to the backing service.
* @param userId User id under which to run.
*
* @hide
*/
public AccessibilityManager(Handler handler, IAccessibilityManager service, int userId) {
mCallback = new MyCallback();
mHandler = handler;
mUserId = userId;
synchronized (mLock) {
tryConnectToServiceLocked(service);
}
}
/**
* @hide
*/
public IAccessibilityManagerClient getClient() {
return mClient;
}
/**
* @hide
*/
@VisibleForTesting
public Handler.Callback getCallback() {
return mCallback;
}
/**
* Returns if the accessibility in the system is enabled.
*
* @return True if accessibility is enabled, false otherwise.
*/
public boolean isEnabled() {
synchronized (mLock) {
return mIsEnabled || (mAccessibilityPolicy != null
&& mAccessibilityPolicy.isEnabled(mIsEnabled));
}
}
/**
* Returns if the touch exploration in the system is enabled.
*
* @return True if touch exploration is enabled, false otherwise.
*/
public boolean isTouchExplorationEnabled() {
synchronized (mLock) {
IAccessibilityManager service = getServiceLocked();
if (service == null) {
return false;
}
return mIsTouchExplorationEnabled;
}
}
/**
* Returns if the high text contrast in the system is enabled.
*
* Note: You need to query this only if you application is
* doing its own rendering and does not rely on the platform rendering pipeline.
*
*
* @return True if high text contrast is enabled, false otherwise.
*
* @hide
*/
public boolean isHighTextContrastEnabled() {
synchronized (mLock) {
IAccessibilityManager service = getServiceLocked();
if (service == null) {
return false;
}
return mIsHighTextContrastEnabled;
}
}
/**
* Sends an {@link AccessibilityEvent}.
*
* @param event The event to send.
*
* @throws IllegalStateException if accessibility is not enabled.
*
* Note: The preferred mechanism for sending custom accessibility
* events is through calling
* {@link android.view.ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)}
* instead of this method to allow predecessors to augment/filter events sent by
* their descendants.
*/
public void sendAccessibilityEvent(AccessibilityEvent event) {
final IAccessibilityManager service;
final int userId;
final AccessibilityEvent dispatchedEvent;
synchronized (mLock) {
service = getServiceLocked();
if (service == null) {
return;
}
event.setEventTime(SystemClock.uptimeMillis());
if (mAccessibilityPolicy != null) {
dispatchedEvent = mAccessibilityPolicy.onAccessibilityEvent(event,
mIsEnabled, mRelevantEventTypes);
if (dispatchedEvent == null) {
return;
}
} else {
dispatchedEvent = event;
}
if (!isEnabled()) {
Looper myLooper = Looper.myLooper();
if (myLooper == Looper.getMainLooper()) {
throw new IllegalStateException(
"Accessibility off. Did you forget to check that?");
} else {
// If we're not running on the thread with the main looper, it's possible for
// the state of accessibility to change between checking isEnabled and
// calling this method. So just log the error rather than throwing the
// exception.
Log.e(LOG_TAG, "AccessibilityEvent sent with accessibility disabled");
return;
}
}
if ((dispatchedEvent.getEventType() & mRelevantEventTypes) == 0) {
if (DEBUG) {
Log.i(LOG_TAG, "Not dispatching irrelevant event: " + dispatchedEvent
+ " that is not among "
+ AccessibilityEvent.eventTypeToString(mRelevantEventTypes));
}
return;
}
userId = mUserId;
}
try {
// it is possible that this manager is in the same process as the service but
// client using it is called through Binder from another process. Example: MMS
// app adds a SMS notification and the NotificationManagerService calls this method
long identityToken = Binder.clearCallingIdentity();
try {
service.sendAccessibilityEvent(dispatchedEvent, userId);
} finally {
Binder.restoreCallingIdentity(identityToken);
}
if (DEBUG) {
Log.i(LOG_TAG, dispatchedEvent + " sent");
}
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error during sending " + dispatchedEvent + " ", re);
} finally {
if (event != dispatchedEvent) {
event.recycle();
}
dispatchedEvent.recycle();
}
}
/**
* Requests feedback interruption from all accessibility services.
*/
public void interrupt() {
final IAccessibilityManager service;
final int userId;
synchronized (mLock) {
service = getServiceLocked();
if (service == null) {
return;
}
if (!isEnabled()) {
Looper myLooper = Looper.myLooper();
if (myLooper == Looper.getMainLooper()) {
throw new IllegalStateException(
"Accessibility off. Did you forget to check that?");
} else {
// If we're not running on the thread with the main looper, it's possible for
// the state of accessibility to change between checking isEnabled and
// calling this method. So just log the error rather than throwing the
// exception.
Log.e(LOG_TAG, "Interrupt called with accessibility disabled");
return;
}
}
userId = mUserId;
}
try {
service.interrupt(userId);
if (DEBUG) {
Log.i(LOG_TAG, "Requested interrupt from all services");
}
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error while requesting interrupt from all services. ", re);
}
}
/**
* Returns the {@link ServiceInfo}s of the installed accessibility services.
*
* @return An unmodifiable list with {@link ServiceInfo}s.
*
* @deprecated Use {@link #getInstalledAccessibilityServiceList()}
*/
@Deprecated
public List getAccessibilityServiceList() {
List infos = getInstalledAccessibilityServiceList();
List services = new ArrayList<>();
final int infoCount = infos.size();
for (int i = 0; i < infoCount; i++) {
AccessibilityServiceInfo info = infos.get(i);
services.add(info.getResolveInfo().serviceInfo);
}
return Collections.unmodifiableList(services);
}
/**
* Returns the {@link AccessibilityServiceInfo}s of the installed accessibility services.
*
* @return An unmodifiable list with {@link AccessibilityServiceInfo}s.
*/
public List getInstalledAccessibilityServiceList() {
final IAccessibilityManager service;
final int userId;
synchronized (mLock) {
service = getServiceLocked();
if (service == null) {
return Collections.emptyList();
}
userId = mUserId;
}
List services = null;
try {
services = service.getInstalledAccessibilityServiceList(userId);
if (DEBUG) {
Log.i(LOG_TAG, "Installed AccessibilityServices " + services);
}
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error while obtaining the installed AccessibilityServices. ", re);
}
if (mAccessibilityPolicy != null) {
services = mAccessibilityPolicy.getInstalledAccessibilityServiceList(services);
}
if (services != null) {
return Collections.unmodifiableList(services);
} else {
return Collections.emptyList();
}
}
/**
* Returns the {@link AccessibilityServiceInfo}s of the enabled accessibility services
* for a given feedback type.
*
* @param feedbackTypeFlags The feedback type flags.
* @return An unmodifiable list with {@link AccessibilityServiceInfo}s.
*
* @see AccessibilityServiceInfo#FEEDBACK_AUDIBLE
* @see AccessibilityServiceInfo#FEEDBACK_GENERIC
* @see AccessibilityServiceInfo#FEEDBACK_HAPTIC
* @see AccessibilityServiceInfo#FEEDBACK_SPOKEN
* @see AccessibilityServiceInfo#FEEDBACK_VISUAL
* @see AccessibilityServiceInfo#FEEDBACK_BRAILLE
*/
public List getEnabledAccessibilityServiceList(
int feedbackTypeFlags) {
final IAccessibilityManager service;
final int userId;
synchronized (mLock) {
service = getServiceLocked();
if (service == null) {
return Collections.emptyList();
}
userId = mUserId;
}
List services = null;
try {
services = service.getEnabledAccessibilityServiceList(feedbackTypeFlags, userId);
if (DEBUG) {
Log.i(LOG_TAG, "Installed AccessibilityServices " + services);
}
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error while obtaining the installed AccessibilityServices. ", re);
}
if (mAccessibilityPolicy != null) {
services = mAccessibilityPolicy.getEnabledAccessibilityServiceList(
feedbackTypeFlags, services);
}
if (services != null) {
return Collections.unmodifiableList(services);
} else {
return Collections.emptyList();
}
}
/**
* Registers an {@link AccessibilityStateChangeListener} for changes in
* the global accessibility state of the system. Equivalent to calling
* {@link #addAccessibilityStateChangeListener(AccessibilityStateChangeListener, Handler)}
* with a null handler.
*
* @param listener The listener.
* @return Always returns {@code true}.
*/
public boolean addAccessibilityStateChangeListener(
@NonNull AccessibilityStateChangeListener listener) {
addAccessibilityStateChangeListener(listener, null);
return true;
}
/**
* Registers an {@link AccessibilityStateChangeListener} for changes in
* the global accessibility state of the system. If the listener has already been registered,
* the handler used to call it back is updated.
*
* @param listener The listener.
* @param handler The handler on which the listener should be called back, or {@code null}
* for a callback on the process's main handler.
*/
public void addAccessibilityStateChangeListener(
@NonNull AccessibilityStateChangeListener listener, @Nullable Handler handler) {
synchronized (mLock) {
mAccessibilityStateChangeListeners
.put(listener, (handler == null) ? mHandler : handler);
}
}
/**
* Unregisters an {@link AccessibilityStateChangeListener}.
*
* @param listener The listener.
* @return True if the listener was previously registered.
*/
public boolean removeAccessibilityStateChangeListener(
@NonNull AccessibilityStateChangeListener listener) {
synchronized (mLock) {
int index = mAccessibilityStateChangeListeners.indexOfKey(listener);
mAccessibilityStateChangeListeners.remove(listener);
return (index >= 0);
}
}
/**
* Registers a {@link TouchExplorationStateChangeListener} for changes in
* the global touch exploration state of the system. Equivalent to calling
* {@link #addTouchExplorationStateChangeListener(TouchExplorationStateChangeListener, Handler)}
* with a null handler.
*
* @param listener The listener.
* @return Always returns {@code true}.
*/
public boolean addTouchExplorationStateChangeListener(
@NonNull TouchExplorationStateChangeListener listener) {
addTouchExplorationStateChangeListener(listener, null);
return true;
}
/**
* Registers an {@link TouchExplorationStateChangeListener} for changes in
* the global touch exploration state of the system. If the listener has already been
* registered, the handler used to call it back is updated.
*
* @param listener The listener.
* @param handler The handler on which the listener should be called back, or {@code null}
* for a callback on the process's main handler.
*/
public void addTouchExplorationStateChangeListener(
@NonNull TouchExplorationStateChangeListener listener, @Nullable Handler handler) {
synchronized (mLock) {
mTouchExplorationStateChangeListeners
.put(listener, (handler == null) ? mHandler : handler);
}
}
/**
* Unregisters a {@link TouchExplorationStateChangeListener}.
*
* @param listener The listener.
* @return True if listener was previously registered.
*/
public boolean removeTouchExplorationStateChangeListener(
@NonNull TouchExplorationStateChangeListener listener) {
synchronized (mLock) {
int index = mTouchExplorationStateChangeListeners.indexOfKey(listener);
mTouchExplorationStateChangeListeners.remove(listener);
return (index >= 0);
}
}
/**
* Registers a {@link AccessibilityServicesStateChangeListener}.
*
* @param listener The listener.
* @param handler The handler on which the listener should be called back, or {@code null}
* for a callback on the process's main handler.
* @hide
*/
public void addAccessibilityServicesStateChangeListener(
@NonNull AccessibilityServicesStateChangeListener listener, @Nullable Handler handler) {
synchronized (mLock) {
mServicesStateChangeListeners
.put(listener, (handler == null) ? mHandler : handler);
}
}
/**
* Unregisters a {@link AccessibilityServicesStateChangeListener}.
*
* @param listener The listener.
*
* @hide
*/
public void removeAccessibilityServicesStateChangeListener(
@NonNull AccessibilityServicesStateChangeListener listener) {
synchronized (mLock) {
mServicesStateChangeListeners.remove(listener);
}
}
/**
* Registers a {@link AccessibilityRequestPreparer}.
*/
public void addAccessibilityRequestPreparer(AccessibilityRequestPreparer preparer) {
if (mRequestPreparerLists == null) {
mRequestPreparerLists = new SparseArray<>(1);
}
int id = preparer.getView().getAccessibilityViewId();
List requestPreparerList = mRequestPreparerLists.get(id);
if (requestPreparerList == null) {
requestPreparerList = new ArrayList<>(1);
mRequestPreparerLists.put(id, requestPreparerList);
}
requestPreparerList.add(preparer);
}
/**
* Unregisters a {@link AccessibilityRequestPreparer}.
*/
public void removeAccessibilityRequestPreparer(AccessibilityRequestPreparer preparer) {
if (mRequestPreparerLists == null) {
return;
}
int viewId = preparer.getView().getAccessibilityViewId();
List requestPreparerList = mRequestPreparerLists.get(viewId);
if (requestPreparerList != null) {
requestPreparerList.remove(preparer);
if (requestPreparerList.isEmpty()) {
mRequestPreparerLists.remove(viewId);
}
}
}
/**
* Get the preparers that are registered for an accessibility ID
*
* @param id The ID of interest
* @return The list of preparers, or {@code null} if there are none.
*
* @hide
*/
public List getRequestPreparersForAccessibilityId(int id) {
if (mRequestPreparerLists == null) {
return null;
}
return mRequestPreparerLists.get(id);
}
/**
* Registers a {@link HighTextContrastChangeListener} for changes in
* the global high text contrast state of the system.
*
* @param listener The listener.
*
* @hide
*/
public void addHighTextContrastStateChangeListener(
@NonNull HighTextContrastChangeListener listener, @Nullable Handler handler) {
synchronized (mLock) {
mHighTextContrastStateChangeListeners
.put(listener, (handler == null) ? mHandler : handler);
}
}
/**
* Unregisters a {@link HighTextContrastChangeListener}.
*
* @param listener The listener.
*
* @hide
*/
public void removeHighTextContrastStateChangeListener(
@NonNull HighTextContrastChangeListener listener) {
synchronized (mLock) {
mHighTextContrastStateChangeListeners.remove(listener);
}
}
/**
* Sets the {@link AccessibilityPolicy} controlling this manager.
*
* @param policy The policy.
*
* @hide
*/
public void setAccessibilityPolicy(@Nullable AccessibilityPolicy policy) {
synchronized (mLock) {
mAccessibilityPolicy = policy;
}
}
/**
* Check if the accessibility volume stream is active.
*
* @return True if accessibility volume is active (i.e. some service has requested it). False
* otherwise.
* @hide
*/
public boolean isAccessibilityVolumeStreamActive() {
List serviceInfos =
getEnabledAccessibilityServiceList(AccessibilityServiceInfo.FEEDBACK_ALL_MASK);
for (int i = 0; i < serviceInfos.size(); i++) {
if ((serviceInfos.get(i).flags & FLAG_ENABLE_ACCESSIBILITY_VOLUME) != 0) {
return true;
}
}
return false;
}
/**
* Report a fingerprint gesture to accessibility. Only available for the system process.
*
* @param keyCode The key code of the gesture
* @return {@code true} if accessibility consumes the event. {@code false} if not.
* @hide
*/
public boolean sendFingerprintGesture(int keyCode) {
final IAccessibilityManager service;
synchronized (mLock) {
service = getServiceLocked();
if (service == null) {
return false;
}
}
try {
return service.sendFingerprintGesture(keyCode);
} catch (RemoteException e) {
return false;
}
}
/**
* Sets the current state and notifies listeners, if necessary.
*
* @param stateFlags The state flags.
*/
private void setStateLocked(int stateFlags) {
final boolean enabled = (stateFlags & STATE_FLAG_ACCESSIBILITY_ENABLED) != 0;
final boolean touchExplorationEnabled =
(stateFlags & STATE_FLAG_TOUCH_EXPLORATION_ENABLED) != 0;
final boolean highTextContrastEnabled =
(stateFlags & STATE_FLAG_HIGH_TEXT_CONTRAST_ENABLED) != 0;
final boolean wasEnabled = isEnabled();
final boolean wasTouchExplorationEnabled = mIsTouchExplorationEnabled;
final boolean wasHighTextContrastEnabled = mIsHighTextContrastEnabled;
// Ensure listeners get current state from isZzzEnabled() calls.
mIsEnabled = enabled;
mIsTouchExplorationEnabled = touchExplorationEnabled;
mIsHighTextContrastEnabled = highTextContrastEnabled;
if (wasEnabled != isEnabled()) {
notifyAccessibilityStateChanged();
}
if (wasTouchExplorationEnabled != touchExplorationEnabled) {
notifyTouchExplorationStateChanged();
}
if (wasHighTextContrastEnabled != highTextContrastEnabled) {
notifyHighTextContrastStateChanged();
}
}
/**
* Find an installed service with the specified {@link ComponentName}.
*
* @param componentName The name to match to the service.
*
* @return The info corresponding to the installed service, or {@code null} if no such service
* is installed.
* @hide
*/
public AccessibilityServiceInfo getInstalledServiceInfoWithComponentName(
ComponentName componentName) {
final List installedServiceInfos =
getInstalledAccessibilityServiceList();
if ((installedServiceInfos == null) || (componentName == null)) {
return null;
}
for (int i = 0; i < installedServiceInfos.size(); i++) {
if (componentName.equals(installedServiceInfos.get(i).getComponentName())) {
return installedServiceInfos.get(i);
}
}
return null;
}
/**
* Adds an accessibility interaction connection interface for a given window.
* @param windowToken The window token to which a connection is added.
* @param connection The connection.
*
* @hide
*/
public int addAccessibilityInteractionConnection(IWindow windowToken,
String packageName, IAccessibilityInteractionConnection connection) {
final IAccessibilityManager service;
final int userId;
synchronized (mLock) {
service = getServiceLocked();
if (service == null) {
return View.NO_ID;
}
userId = mUserId;
}
try {
return service.addAccessibilityInteractionConnection(windowToken, connection,
packageName, userId);
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error while adding an accessibility interaction connection. ", re);
}
return View.NO_ID;
}
/**
* Removed an accessibility interaction connection interface for a given window.
* @param windowToken The window token to which a connection is removed.
*
* @hide
*/
public void removeAccessibilityInteractionConnection(IWindow windowToken) {
final IAccessibilityManager service;
synchronized (mLock) {
service = getServiceLocked();
if (service == null) {
return;
}
}
try {
service.removeAccessibilityInteractionConnection(windowToken);
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error while removing an accessibility interaction connection. ", re);
}
}
/**
* Perform the accessibility shortcut if the caller has permission.
*
* @hide
*/
public void performAccessibilityShortcut() {
final IAccessibilityManager service;
synchronized (mLock) {
service = getServiceLocked();
if (service == null) {
return;
}
}
try {
service.performAccessibilityShortcut();
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error performing accessibility shortcut. ", re);
}
}
/**
* Notifies that the accessibility button in the system's navigation area has been clicked
*
* @hide
*/
public void notifyAccessibilityButtonClicked() {
final IAccessibilityManager service;
synchronized (mLock) {
service = getServiceLocked();
if (service == null) {
return;
}
}
try {
service.notifyAccessibilityButtonClicked();
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error while dispatching accessibility button click", re);
}
}
/**
* Notifies that the visibility of the accessibility button in the system's navigation area
* has changed.
*
* @param shown {@code true} if the accessibility button is visible within the system
* navigation area, {@code false} otherwise
* @hide
*/
public void notifyAccessibilityButtonVisibilityChanged(boolean shown) {
final IAccessibilityManager service;
synchronized (mLock) {
service = getServiceLocked();
if (service == null) {
return;
}
}
try {
service.notifyAccessibilityButtonVisibilityChanged(shown);
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error while dispatching accessibility button visibility change", re);
}
}
/**
* Set an IAccessibilityInteractionConnection to replace the actions of a picture-in-picture
* window. Intended for use by the System UI only.
*
* @param connection The connection to handle the actions. Set to {@code null} to avoid
* affecting the actions.
*
* @hide
*/
public void setPictureInPictureActionReplacingConnection(
@Nullable IAccessibilityInteractionConnection connection) {
final IAccessibilityManager service;
synchronized (mLock) {
service = getServiceLocked();
if (service == null) {
return;
}
}
try {
service.setPictureInPictureActionReplacingConnection(connection);
} catch (RemoteException re) {
Log.e(LOG_TAG, "Error setting picture in picture action replacement", re);
}
}
private IAccessibilityManager getServiceLocked() {
if (mService == null) {
tryConnectToServiceLocked(null);
}
return mService;
}
private void tryConnectToServiceLocked(IAccessibilityManager service) {
if (service == null) {
IBinder iBinder = ServiceManager.getService(Context.ACCESSIBILITY_SERVICE);
if (iBinder == null) {
return;
}
service = IAccessibilityManager.Stub.asInterface(iBinder);
}
try {
final long userStateAndRelevantEvents = service.addClient(mClient, mUserId);
setStateLocked(IntPair.first(userStateAndRelevantEvents));
mRelevantEventTypes = IntPair.second(userStateAndRelevantEvents);
mService = service;
} catch (RemoteException re) {
Log.e(LOG_TAG, "AccessibilityManagerService is dead", re);
}
}
/**
* Notifies the registered {@link AccessibilityStateChangeListener}s.
*/
private void notifyAccessibilityStateChanged() {
final boolean isEnabled;
final ArrayMap listeners;
synchronized (mLock) {
if (mAccessibilityStateChangeListeners.isEmpty()) {
return;
}
isEnabled = isEnabled();
listeners = new ArrayMap<>(mAccessibilityStateChangeListeners);
}
final int numListeners = listeners.size();
for (int i = 0; i < numListeners; i++) {
final AccessibilityStateChangeListener listener = listeners.keyAt(i);
listeners.valueAt(i).post(() ->
listener.onAccessibilityStateChanged(isEnabled));
}
}
/**
* Notifies the registered {@link TouchExplorationStateChangeListener}s.
*/
private void notifyTouchExplorationStateChanged() {
final boolean isTouchExplorationEnabled;
final ArrayMap listeners;
synchronized (mLock) {
if (mTouchExplorationStateChangeListeners.isEmpty()) {
return;
}
isTouchExplorationEnabled = mIsTouchExplorationEnabled;
listeners = new ArrayMap<>(mTouchExplorationStateChangeListeners);
}
final int numListeners = listeners.size();
for (int i = 0; i < numListeners; i++) {
final TouchExplorationStateChangeListener listener = listeners.keyAt(i);
listeners.valueAt(i).post(() ->
listener.onTouchExplorationStateChanged(isTouchExplorationEnabled));
}
}
/**
* Notifies the registered {@link HighTextContrastChangeListener}s.
*/
private void notifyHighTextContrastStateChanged() {
final boolean isHighTextContrastEnabled;
final ArrayMap listeners;
synchronized (mLock) {
if (mHighTextContrastStateChangeListeners.isEmpty()) {
return;
}
isHighTextContrastEnabled = mIsHighTextContrastEnabled;
listeners = new ArrayMap<>(mHighTextContrastStateChangeListeners);
}
final int numListeners = listeners.size();
for (int i = 0; i < numListeners; i++) {
final HighTextContrastChangeListener listener = listeners.keyAt(i);
listeners.valueAt(i).post(() ->
listener.onHighTextContrastStateChanged(isHighTextContrastEnabled));
}
}
/**
* Determines if the accessibility button within the system navigation area is supported.
*
* @return {@code true} if the accessibility button is supported on this device,
* {@code false} otherwise
*/
public static boolean isAccessibilityButtonSupported() {
final Resources res = Resources.getSystem();
return res.getBoolean(com.android.internal.R.bool.config_showNavigationBar);
}
private final class MyCallback implements Handler.Callback {
public static final int MSG_SET_STATE = 1;
@Override
public boolean handleMessage(Message message) {
switch (message.what) {
case MSG_SET_STATE: {
// See comment at mClient
final int state = message.arg1;
synchronized (mLock) {
setStateLocked(state);
}
} break;
}
return true;
}
}
}