| /* |
| ** Copyright 2009, The Android Open Source Project |
| ** |
| ** Licensed under the Apache License, Version 2.0 (the "License"); |
| ** you may not use this file except in compliance with the License. |
| ** You may obtain a copy of the License at |
| ** |
| ** http://www.apache.org/licenses/LICENSE-2.0 |
| ** |
| ** Unless required by applicable law or agreed to in writing, software |
| ** distributed under the License is distributed on an "AS IS" BASIS, |
| ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| ** See the License for the specific language governing permissions and |
| ** limitations under the License. |
| */ |
| |
| package com.android.server.accessibility; |
| |
| import android.Manifest; |
| import android.accessibilityservice.AccessibilityService; |
| import android.accessibilityservice.AccessibilityServiceInfo; |
| import android.accessibilityservice.IAccessibilityServiceConnection; |
| import android.accessibilityservice.IEventListener; |
| import android.app.PendingIntent; |
| import android.content.BroadcastReceiver; |
| import android.content.ComponentName; |
| import android.content.ContentResolver; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.IntentFilter; |
| import android.content.ServiceConnection; |
| import android.content.pm.PackageManager; |
| import android.content.pm.ResolveInfo; |
| import android.database.ContentObserver; |
| import android.graphics.Rect; |
| import android.net.Uri; |
| import android.os.Binder; |
| import android.os.Handler; |
| import android.os.IBinder; |
| import android.os.Message; |
| import android.os.RemoteException; |
| import android.os.ServiceManager; |
| import android.os.SystemClock; |
| import android.provider.Settings; |
| import android.text.TextUtils; |
| import android.text.TextUtils.SimpleStringSplitter; |
| import android.util.Slog; |
| import android.util.SparseArray; |
| import android.view.IWindow; |
| import android.view.View; |
| import android.view.accessibility.AccessibilityEvent; |
| import android.view.accessibility.AccessibilityNodeInfo; |
| import android.view.accessibility.IAccessibilityInteractionConnection; |
| import android.view.accessibility.IAccessibilityInteractionConnectionCallback; |
| import android.view.accessibility.IAccessibilityManager; |
| import android.view.accessibility.IAccessibilityManagerClient; |
| |
| import com.android.internal.content.PackageMonitor; |
| import com.android.internal.os.HandlerCaller; |
| import com.android.internal.os.HandlerCaller.SomeArgs; |
| import com.android.server.wm.WindowManagerService; |
| |
| import org.xmlpull.v1.XmlPullParserException; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| /** |
| * This class is instantiated by the system as a system level service and can be |
| * accessed only by the system. The task of this service is to be a centralized |
| * event dispatch for {@link AccessibilityEvent}s generated across all processes |
| * on the device. Events are dispatched to {@link AccessibilityService}s. |
| * |
| * @hide |
| */ |
| public class AccessibilityManagerService extends IAccessibilityManager.Stub |
| implements HandlerCaller.Callback { |
| |
| private static final boolean DEBUG = false; |
| |
| private static final String LOG_TAG = "AccessibilityManagerService"; |
| |
| private static final String FUNCTION_REGISTER_EVENT_LISTENER = |
| "registerEventListener"; |
| |
| private static int sIdCounter = 0; |
| |
| private static final int OWN_PROCESS_ID = android.os.Process.myPid(); |
| |
| private static final int DO_SET_SERVICE_INFO = 10; |
| |
| private static int sNextWindowId; |
| |
| final HandlerCaller mCaller; |
| |
| final Context mContext; |
| |
| final Object mLock = new Object(); |
| |
| final List<Service> mServices = new ArrayList<Service>(); |
| |
| final List<IAccessibilityManagerClient> mClients = |
| new ArrayList<IAccessibilityManagerClient>(); |
| |
| final Map<ComponentName, Service> mComponentNameToServiceMap = new HashMap<ComponentName, Service>(); |
| |
| private final List<AccessibilityServiceInfo> mInstalledServices = new ArrayList<AccessibilityServiceInfo>(); |
| |
| private final Set<ComponentName> mEnabledServices = new HashSet<ComponentName>(); |
| |
| private final SparseArray<IAccessibilityInteractionConnection> mWindowIdToInteractionConnectionMap = |
| new SparseArray<IAccessibilityInteractionConnection>(); |
| |
| private final SparseArray<IBinder> mWindowIdToWindowTokenMap = new SparseArray<IBinder>(); |
| |
| private final SimpleStringSplitter mStringColonSplitter = new SimpleStringSplitter(':'); |
| |
| private PackageManager mPackageManager; |
| |
| private int mHandledFeedbackTypes = 0; |
| |
| private boolean mIsEnabled; |
| |
| private AccessibilityInputFilter mInputFilter; |
| |
| private final List<AccessibilityServiceInfo> mEnabledServicesForFeedbackTempList = new ArrayList<AccessibilityServiceInfo>(); |
| |
| private boolean mHasInputFilter; |
| |
| private final WindowManagerService mWindowManagerService; |
| |
| private final SecurityPolicy mSecurityPolicy; |
| |
| /** |
| * Handler for delayed event dispatch. |
| */ |
| private Handler mHandler = new Handler() { |
| |
| @Override |
| public void handleMessage(Message message) { |
| Service service = (Service) message.obj; |
| int eventType = message.arg1; |
| |
| synchronized (mLock) { |
| notifyEventListenerLocked(service, eventType); |
| } |
| } |
| }; |
| |
| /** |
| * Creates a new instance. |
| * |
| * @param context A {@link Context} instance. |
| */ |
| public AccessibilityManagerService(Context context) { |
| mContext = context; |
| mPackageManager = mContext.getPackageManager(); |
| mCaller = new HandlerCaller(context, this); |
| mWindowManagerService = (WindowManagerService) ServiceManager.getService( |
| Context.WINDOW_SERVICE); |
| mSecurityPolicy = new SecurityPolicy(); |
| |
| registerPackageChangeAndBootCompletedBroadcastReceiver(); |
| registerSettingsContentObservers(); |
| } |
| |
| /** |
| * Registers a {@link BroadcastReceiver} for the events of |
| * adding/changing/removing/restarting a package and boot completion. |
| */ |
| private void registerPackageChangeAndBootCompletedBroadcastReceiver() { |
| Context context = mContext; |
| |
| PackageMonitor monitor = new PackageMonitor() { |
| @Override |
| public void onSomePackagesChanged() { |
| synchronized (mLock) { |
| populateAccessibilityServiceListLocked(); |
| manageServicesLocked(); |
| } |
| } |
| |
| @Override |
| public boolean onHandleForceStop(Intent intent, String[] packages, |
| int uid, boolean doit) { |
| synchronized (mLock) { |
| boolean changed = false; |
| Iterator<ComponentName> it = mEnabledServices.iterator(); |
| while (it.hasNext()) { |
| ComponentName comp = it.next(); |
| String compPkg = comp.getPackageName(); |
| for (String pkg : packages) { |
| if (compPkg.equals(pkg)) { |
| if (!doit) { |
| return true; |
| } |
| it.remove(); |
| changed = true; |
| } |
| } |
| } |
| if (changed) { |
| it = mEnabledServices.iterator(); |
| StringBuilder str = new StringBuilder(); |
| while (it.hasNext()) { |
| if (str.length() > 0) { |
| str.append(':'); |
| } |
| str.append(it.next().flattenToShortString()); |
| } |
| Settings.Secure.putString(mContext.getContentResolver(), |
| Settings.Secure.ENABLED_ACCESSIBILITY_SERVICES, |
| str.toString()); |
| manageServicesLocked(); |
| } |
| return false; |
| } |
| } |
| |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| if (intent.getAction() == Intent.ACTION_BOOT_COMPLETED) { |
| synchronized (mLock) { |
| populateAccessibilityServiceListLocked(); |
| // get the accessibility enabled setting on boot |
| mIsEnabled = Settings.Secure.getInt(mContext.getContentResolver(), |
| Settings.Secure.ACCESSIBILITY_ENABLED, 0) == 1; |
| |
| // if accessibility is enabled inform our clients we are on |
| if (mIsEnabled) { |
| updateClientsLocked(); |
| } |
| |
| manageServicesLocked(); |
| } |
| |
| return; |
| } |
| |
| super.onReceive(context, intent); |
| } |
| }; |
| |
| // package changes |
| monitor.register(context, true); |
| |
| // boot completed |
| IntentFilter bootFiler = new IntentFilter(Intent.ACTION_BOOT_COMPLETED); |
| mContext.registerReceiver(monitor, bootFiler); |
| } |
| |
| /** |
| * {@link ContentObserver}s for {@link Settings.Secure#ACCESSIBILITY_ENABLED} |
| * and {@link Settings.Secure#ENABLED_ACCESSIBILITY_SERVICES} settings. |
| */ |
| private void registerSettingsContentObservers() { |
| ContentResolver contentResolver = mContext.getContentResolver(); |
| |
| Uri enabledUri = Settings.Secure.getUriFor(Settings.Secure.ACCESSIBILITY_ENABLED); |
| contentResolver.registerContentObserver(enabledUri, false, |
| new ContentObserver(new Handler()) { |
| @Override |
| public void onChange(boolean selfChange) { |
| super.onChange(selfChange); |
| |
| synchronized (mLock) { |
| mIsEnabled = Settings.Secure.getInt(mContext.getContentResolver(), |
| Settings.Secure.ACCESSIBILITY_ENABLED, 0) == 1; |
| if (mIsEnabled) { |
| manageServicesLocked(); |
| } else { |
| unbindAllServicesLocked(); |
| } |
| updateClientsLocked(); |
| } |
| } |
| }); |
| |
| Uri providersUri = |
| Settings.Secure.getUriFor(Settings.Secure.ENABLED_ACCESSIBILITY_SERVICES); |
| contentResolver.registerContentObserver(providersUri, false, |
| new ContentObserver(new Handler()) { |
| @Override |
| public void onChange(boolean selfChange) { |
| super.onChange(selfChange); |
| |
| synchronized (mLock) { |
| manageServicesLocked(); |
| } |
| } |
| }); |
| } |
| |
| public boolean addClient(IAccessibilityManagerClient client) throws RemoteException { |
| synchronized (mLock) { |
| final IAccessibilityManagerClient addedClient = client; |
| mClients.add(addedClient); |
| // Clients are registered all the time until their process is |
| // killed, therefore we do not have a corresponding unlinkToDeath. |
| client.asBinder().linkToDeath(new DeathRecipient() { |
| public void binderDied() { |
| synchronized (mLock) { |
| mClients.remove(addedClient); |
| } |
| } |
| }, 0); |
| return mIsEnabled; |
| } |
| } |
| |
| public boolean sendAccessibilityEvent(AccessibilityEvent event) { |
| synchronized (mLock) { |
| if (mSecurityPolicy.canDispatchAccessibilityEvent(event)) { |
| mSecurityPolicy.updateRetrievalAllowingWindowAndEventSourceLocked(event); |
| notifyAccessibilityServicesDelayedLocked(event, false); |
| notifyAccessibilityServicesDelayedLocked(event, true); |
| } |
| } |
| event.recycle(); |
| mHandledFeedbackTypes = 0; |
| return (OWN_PROCESS_ID != Binder.getCallingPid()); |
| } |
| |
| public List<AccessibilityServiceInfo> getInstalledAccessibilityServiceList() { |
| synchronized (mLock) { |
| return mInstalledServices; |
| } |
| } |
| |
| public List<AccessibilityServiceInfo> getEnabledAccessibilityServiceList(int feedbackType) { |
| List<AccessibilityServiceInfo> result = mEnabledServicesForFeedbackTempList; |
| result.clear(); |
| List<Service> services = mServices; |
| synchronized (mLock) { |
| while (feedbackType != 0) { |
| final int feedbackTypeBit = (1 << Integer.numberOfTrailingZeros(feedbackType)); |
| feedbackType &= ~feedbackTypeBit; |
| final int serviceCount = services.size(); |
| for (int i = 0; i < serviceCount; i++) { |
| Service service = services.get(i); |
| if ((service.mFeedbackType & feedbackTypeBit) != 0) { |
| result.add(service.mAccessibilityServiceInfo); |
| } |
| } |
| } |
| } |
| return result; |
| } |
| |
| public void interrupt() { |
| synchronized (mLock) { |
| for (int i = 0, count = mServices.size(); i < count; i++) { |
| Service service = mServices.get(i); |
| try { |
| service.mServiceInterface.onInterrupt(); |
| } catch (RemoteException re) { |
| Slog.e(LOG_TAG, "Error during sending interrupt request to " |
| + service.mService, re); |
| } |
| } |
| } |
| } |
| |
| public void executeMessage(Message message) { |
| switch (message.what) { |
| case DO_SET_SERVICE_INFO: { |
| SomeArgs arguments = ((SomeArgs) message.obj); |
| |
| AccessibilityServiceInfo info = (AccessibilityServiceInfo) arguments.arg1; |
| Service service = (Service) arguments.arg2; |
| |
| synchronized (mLock) { |
| // If the XML manifest had data to configure the service its info |
| // should be already set. In such a case update only the dynamically |
| // configurable properties. |
| AccessibilityServiceInfo oldInfo = service.mAccessibilityServiceInfo; |
| if (oldInfo != null) { |
| oldInfo.updateDynamicallyConfigurableProperties(info); |
| service.setDynamicallyConfigurableProperties(oldInfo); |
| } else { |
| service.setDynamicallyConfigurableProperties(info); |
| } |
| } |
| } return; |
| default: |
| Slog.w(LOG_TAG, "Unknown message type: " + message.what); |
| } |
| } |
| |
| public int addAccessibilityInteractionConnection(IWindow windowToken, |
| IAccessibilityInteractionConnection connection) throws RemoteException { |
| synchronized (mLock) { |
| final IWindow addedWindowToken = windowToken; |
| final int windowId = sNextWindowId++; |
| connection.asBinder().linkToDeath(new DeathRecipient() { |
| public void binderDied() { |
| synchronized (mLock) { |
| removeAccessibilityInteractionConnection(addedWindowToken); |
| } |
| } |
| }, 0); |
| mWindowIdToWindowTokenMap.put(windowId, addedWindowToken.asBinder()); |
| mWindowIdToInteractionConnectionMap.put(windowId, connection); |
| if (DEBUG) { |
| Slog.i(LOG_TAG, "Adding interaction connection to windowId: " + windowId); |
| } |
| return windowId; |
| } |
| } |
| |
| public void removeAccessibilityInteractionConnection(IWindow windowToken) { |
| synchronized (mLock) { |
| final int count = mWindowIdToWindowTokenMap.size(); |
| for (int i = 0; i < count; i++) { |
| if (mWindowIdToWindowTokenMap.valueAt(i) == windowToken.asBinder()) { |
| final int windowId = mWindowIdToWindowTokenMap.keyAt(i); |
| mWindowIdToWindowTokenMap.remove(windowId); |
| mWindowIdToInteractionConnectionMap.remove(windowId); |
| if (DEBUG) { |
| Slog.i(LOG_TAG, "Removing interaction connection to windowId: " + windowId); |
| } |
| return; |
| } |
| } |
| } |
| } |
| |
| public IAccessibilityServiceConnection registerEventListener(IEventListener listener) { |
| mSecurityPolicy.enforceCallingPermission(Manifest.permission.RETRIEVE_WINDOW_CONTENT, |
| FUNCTION_REGISTER_EVENT_LISTENER); |
| ComponentName componentName = new ComponentName("foo.bar", "FakeAccessibilityService"); |
| synchronized (mLock) { |
| Service oldService = mComponentNameToServiceMap.get(componentName); |
| if (oldService != null) { |
| tryRemoveServiceLocked(oldService); |
| } |
| // This API is intended for testing so enable accessibility to make |
| // sure clients can start poking with the window content. |
| Settings.Secure.putInt(mContext.getContentResolver(), |
| Settings.Secure.ACCESSIBILITY_ENABLED, 1); |
| // Also disable all accessibility services to avoid interference |
| // with the tests. |
| Settings.Secure.putString(mContext.getContentResolver(), |
| Settings.Secure.ENABLED_ACCESSIBILITY_SERVICES, ""); |
| } |
| AccessibilityServiceInfo accessibilityServiceInfo = new AccessibilityServiceInfo(); |
| accessibilityServiceInfo.eventTypes = AccessibilityEvent.TYPES_ALL_MASK; |
| accessibilityServiceInfo.feedbackType = AccessibilityServiceInfo.FEEDBACK_GENERIC; |
| Service service = new Service(componentName, accessibilityServiceInfo, true); |
| service.onServiceConnected(componentName, listener.asBinder()); |
| return service; |
| } |
| |
| /** |
| * Populates the cached list of installed {@link AccessibilityService}s. |
| */ |
| private void populateAccessibilityServiceListLocked() { |
| mInstalledServices.clear(); |
| |
| List<ResolveInfo> installedServices = mPackageManager.queryIntentServices( |
| new Intent(AccessibilityService.SERVICE_INTERFACE), |
| PackageManager.GET_SERVICES | PackageManager.GET_META_DATA); |
| |
| for (int i = 0, count = installedServices.size(); i < count; i++) { |
| ResolveInfo resolveInfo = installedServices.get(i); |
| AccessibilityServiceInfo accessibilityServiceInfo; |
| try { |
| accessibilityServiceInfo = new AccessibilityServiceInfo(resolveInfo, mContext); |
| mInstalledServices.add(accessibilityServiceInfo); |
| } catch (XmlPullParserException xppe) { |
| Slog.e(LOG_TAG, "Error while initializing AccessibilityServiceInfo", xppe); |
| } catch (IOException ioe) { |
| Slog.e(LOG_TAG, "Error while initializing AccessibilityServiceInfo", ioe); |
| } |
| } |
| } |
| |
| /** |
| * Performs {@link AccessibilityService}s delayed notification. The delay is configurable |
| * and denotes the period after the last event before notifying the service. |
| * |
| * @param event The event. |
| * @param isDefault True to notify default listeners, not default services. |
| */ |
| private void notifyAccessibilityServicesDelayedLocked(AccessibilityEvent event, |
| boolean isDefault) { |
| try { |
| for (int i = 0, count = mServices.size(); i < count; i++) { |
| Service service = mServices.get(i); |
| |
| if (service.mIsDefault == isDefault) { |
| if (canDispathEventLocked(service, event, mHandledFeedbackTypes)) { |
| mHandledFeedbackTypes |= service.mFeedbackType; |
| notifyAccessibilityServiceDelayedLocked(service, event); |
| } |
| } |
| } |
| } catch (IndexOutOfBoundsException oobe) { |
| // An out of bounds exception can happen if services are going away |
| // as the for loop is running. If that happens, just bail because |
| // there are no more services to notify. |
| return; |
| } |
| } |
| |
| /** |
| * Performs an {@link AccessibilityService} delayed notification. The delay is configurable |
| * and denotes the period after the last event before notifying the service. |
| * |
| * @param service The service. |
| * @param event The event. |
| */ |
| private void notifyAccessibilityServiceDelayedLocked(Service service, |
| AccessibilityEvent event) { |
| synchronized (mLock) { |
| final int eventType = event.getEventType(); |
| // Make a copy since during dispatch it is possible the event to |
| // be modified to remove its source if the receiving service does |
| // not have permission to access the window content. |
| AccessibilityEvent newEvent = AccessibilityEvent.obtain(event); |
| AccessibilityEvent oldEvent = service.mPendingEvents.get(eventType); |
| service.mPendingEvents.put(eventType, newEvent); |
| |
| final int what = eventType | (service.mId << 16); |
| if (oldEvent != null) { |
| mHandler.removeMessages(what); |
| oldEvent.recycle(); |
| } |
| |
| Message message = mHandler.obtainMessage(what, service); |
| message.arg1 = eventType; |
| mHandler.sendMessageDelayed(message, service.mNotificationTimeout); |
| } |
| } |
| |
| /** |
| * Notifies a service for a scheduled event given the event type. |
| * |
| * @param service The service. |
| * @param eventType The type of the event to dispatch. |
| */ |
| private void notifyEventListenerLocked(Service service, int eventType) { |
| IEventListener listener = service.mServiceInterface; |
| AccessibilityEvent event = service.mPendingEvents.get(eventType); |
| service.mPendingEvents.remove(eventType); |
| try { |
| if (mSecurityPolicy.canRetrieveWindowContent(service)) { |
| event.setConnection(service); |
| } else { |
| event.setSource(null); |
| } |
| event.setSealed(true); |
| listener.onAccessibilityEvent(event); |
| event.recycle(); |
| if (DEBUG) { |
| Slog.i(LOG_TAG, "Event " + event + " sent to " + listener); |
| } |
| } catch (RemoteException re) { |
| Slog.e(LOG_TAG, "Error during sending " + event + " to " + service.mService, re); |
| } |
| } |
| |
| /** |
| * Adds a service. |
| * |
| * @param service The service to add. |
| */ |
| private void tryAddServiceLocked(Service service) { |
| try { |
| if (mServices.contains(service) || !service.isConfigured()) { |
| return; |
| } |
| service.linkToOwnDeath(); |
| mServices.add(service); |
| mComponentNameToServiceMap.put(service.mComponentName, service); |
| updateInputFilterLocked(); |
| } catch (RemoteException e) { |
| /* do nothing */ |
| } |
| } |
| |
| /** |
| * Removes a service. |
| * |
| * @param service The service. |
| * @return True if the service was removed, false otherwise. |
| */ |
| private boolean tryRemoveServiceLocked(Service service) { |
| final boolean removed = mServices.remove(service); |
| if (!removed) { |
| return false; |
| } |
| mComponentNameToServiceMap.remove(service.mComponentName); |
| mHandler.removeMessages(service.mId); |
| service.unlinkToOwnDeath(); |
| updateInputFilterLocked(); |
| return removed; |
| } |
| |
| /** |
| * Determines if given event can be dispatched to a service based on the package of the |
| * event source and already notified services for that event type. Specifically, a |
| * service is notified if it is interested in events from the package and no other service |
| * providing the same feedback type has been notified. Exception are services the |
| * provide generic feedback (feedback type left as a safety net for unforeseen feedback |
| * types) which are always notified. |
| * |
| * @param service The potential receiver. |
| * @param event The event. |
| * @param handledFeedbackTypes The feedback types for which services have been notified. |
| * @return True if the listener should be notified, false otherwise. |
| */ |
| private boolean canDispathEventLocked(Service service, AccessibilityEvent event, |
| int handledFeedbackTypes) { |
| |
| if (!service.isConfigured()) { |
| return false; |
| } |
| |
| int eventType = event.getEventType(); |
| if ((service.mEventTypes & eventType) != eventType) { |
| return false; |
| } |
| |
| Set<String> packageNames = service.mPackageNames; |
| CharSequence packageName = event.getPackageName(); |
| |
| if (packageNames.isEmpty() || packageNames.contains(packageName)) { |
| int feedbackType = service.mFeedbackType; |
| if ((handledFeedbackTypes & feedbackType) != feedbackType |
| || feedbackType == AccessibilityServiceInfo.FEEDBACK_GENERIC) { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| /** |
| * Manages services by starting enabled ones and stopping disabled ones. |
| */ |
| private void manageServicesLocked() { |
| populateEnabledServicesLocked(mEnabledServices); |
| updateServicesStateLocked(mInstalledServices, mEnabledServices); |
| } |
| |
| /** |
| * Unbinds all bound services. |
| */ |
| private void unbindAllServicesLocked() { |
| List<Service> services = mServices; |
| |
| for (int i = 0, count = services.size(); i < count; i++) { |
| Service service = services.get(i); |
| if (service.unbind()) { |
| i--; |
| count--; |
| } |
| } |
| } |
| |
| /** |
| * Populates a list with the {@link ComponentName}s of all enabled |
| * {@link AccessibilityService}s. |
| * |
| * @param enabledServices The list. |
| */ |
| private void populateEnabledServicesLocked(Set<ComponentName> enabledServices) { |
| enabledServices.clear(); |
| |
| String servicesValue = Settings.Secure.getString(mContext.getContentResolver(), |
| Settings.Secure.ENABLED_ACCESSIBILITY_SERVICES); |
| |
| if (servicesValue != null) { |
| TextUtils.SimpleStringSplitter splitter = mStringColonSplitter; |
| splitter.setString(servicesValue); |
| while (splitter.hasNext()) { |
| String str = splitter.next(); |
| if (str == null || str.length() <= 0) { |
| continue; |
| } |
| ComponentName enabledService = ComponentName.unflattenFromString(str); |
| if (enabledService != null) { |
| enabledServices.add(enabledService); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Updates the state of each service by starting (or keeping running) enabled ones and |
| * stopping the rest. |
| * |
| * @param installedServices All installed {@link AccessibilityService}s. |
| * @param enabledServices The {@link ComponentName}s of the enabled services. |
| */ |
| private void updateServicesStateLocked(List<AccessibilityServiceInfo> installedServices, |
| Set<ComponentName> enabledServices) { |
| |
| Map<ComponentName, Service> componentNameToServiceMap = mComponentNameToServiceMap; |
| boolean isEnabled = mIsEnabled; |
| |
| for (int i = 0, count = installedServices.size(); i < count; i++) { |
| AccessibilityServiceInfo installedService = installedServices.get(i); |
| ComponentName componentName = ComponentName.unflattenFromString( |
| installedService.getId()); |
| Service service = componentNameToServiceMap.get(componentName); |
| |
| if (isEnabled) { |
| if (enabledServices.contains(componentName)) { |
| if (service == null) { |
| service = new Service(componentName, installedService, false); |
| } |
| service.bind(); |
| } else if (!enabledServices.contains(componentName)) { |
| if (service != null) { |
| service.unbind(); |
| } |
| } |
| } else { |
| if (service != null) { |
| service.unbind(); |
| } |
| } |
| } |
| } |
| |
| /** |
| * Updates the state of {@link android.view.accessibility.AccessibilityManager} clients. |
| */ |
| private void updateClientsLocked() { |
| for (int i = 0, count = mClients.size(); i < count; i++) { |
| try { |
| mClients.get(i).setEnabled(mIsEnabled); |
| } catch (RemoteException re) { |
| mClients.remove(i); |
| count--; |
| i--; |
| } |
| } |
| } |
| |
| /** |
| * Updates the input filter state. The filter is enabled if accessibility |
| * is enabled and there is at least one accessibility service providing |
| * spoken feedback. |
| */ |
| private void updateInputFilterLocked() { |
| if (mIsEnabled) { |
| final boolean hasSpokenFeedbackServices = !getEnabledAccessibilityServiceList( |
| AccessibilityServiceInfo.FEEDBACK_SPOKEN).isEmpty(); |
| if (hasSpokenFeedbackServices) { |
| if (mHasInputFilter) { |
| return; |
| } |
| if (mInputFilter == null) { |
| mInputFilter = new AccessibilityInputFilter(mContext); |
| } |
| mWindowManagerService.setInputFilter(mInputFilter); |
| mHasInputFilter = true; |
| return; |
| } |
| } |
| if (mHasInputFilter) { |
| mWindowManagerService.setInputFilter(null); |
| mHasInputFilter = false; |
| } |
| } |
| |
| /** |
| * This class represents an accessibility service. It stores all per service |
| * data required for the service management, provides API for starting/stopping the |
| * service and is responsible for adding/removing the service in the data structures |
| * for service management. The class also exposes configuration interface that is |
| * passed to the service it represents as soon it is bound. It also serves as the |
| * connection for the service. |
| */ |
| class Service extends IAccessibilityServiceConnection.Stub |
| implements ServiceConnection, DeathRecipient { |
| int mId = 0; |
| |
| AccessibilityServiceInfo mAccessibilityServiceInfo; |
| |
| IBinder mService; |
| |
| IEventListener mServiceInterface; |
| |
| int mEventTypes; |
| |
| int mFeedbackType; |
| |
| Set<String> mPackageNames = new HashSet<String>(); |
| |
| boolean mIsDefault; |
| |
| long mNotificationTimeout; |
| |
| ComponentName mComponentName; |
| |
| Intent mIntent; |
| |
| boolean mCanRetrieveScreenContent; |
| |
| boolean mIsFake; |
| |
| final Callback mCallback = new Callback(); |
| |
| final AtomicInteger mInteractionIdCounter = new AtomicInteger(); |
| |
| final Rect mTempBounds = new Rect(); |
| |
| // the events pending events to be dispatched to this service |
| final SparseArray<AccessibilityEvent> mPendingEvents = |
| new SparseArray<AccessibilityEvent>(); |
| |
| public Service(ComponentName componentName, |
| AccessibilityServiceInfo accessibilityServiceInfo, boolean isFake) { |
| mId = sIdCounter++; |
| mComponentName = componentName; |
| mAccessibilityServiceInfo = accessibilityServiceInfo; |
| mIsFake = isFake; |
| if (!isFake) { |
| mCanRetrieveScreenContent = accessibilityServiceInfo.getCanRetrieveWindowContent(); |
| mIntent = new Intent().setComponent(mComponentName); |
| mIntent.putExtra(Intent.EXTRA_CLIENT_LABEL, |
| com.android.internal.R.string.accessibility_binding_label); |
| mIntent.putExtra(Intent.EXTRA_CLIENT_INTENT, PendingIntent.getActivity( |
| mContext, 0, new Intent(Settings.ACTION_ACCESSIBILITY_SETTINGS), 0)); |
| } else { |
| mCanRetrieveScreenContent = true; |
| } |
| setDynamicallyConfigurableProperties(accessibilityServiceInfo); |
| } |
| |
| public void setDynamicallyConfigurableProperties(AccessibilityServiceInfo info) { |
| mEventTypes = info.eventTypes; |
| mFeedbackType = info.feedbackType; |
| String[] packageNames = info.packageNames; |
| if (packageNames != null) { |
| mPackageNames.addAll(Arrays.asList(packageNames)); |
| } |
| mNotificationTimeout = info.notificationTimeout; |
| mIsDefault = (info.flags & AccessibilityServiceInfo.DEFAULT) != 0; |
| |
| synchronized (mLock) { |
| tryAddServiceLocked(this); |
| } |
| } |
| |
| /** |
| * Binds to the accessibility service. |
| * |
| * @return True if binding is successful. |
| */ |
| public boolean bind() { |
| if (!mIsFake && mService == null) { |
| return mContext.bindService(mIntent, this, Context.BIND_AUTO_CREATE); |
| } |
| return false; |
| } |
| |
| /** |
| * Unbinds form the accessibility service and removes it from the data |
| * structures for service management. |
| * |
| * @return True if unbinding is successful. |
| */ |
| public boolean unbind() { |
| if (mService != null) { |
| synchronized (mLock) { |
| tryRemoveServiceLocked(this); |
| } |
| if (!mIsFake) { |
| mContext.unbindService(this); |
| } |
| mService = null; |
| return true; |
| } |
| return false; |
| } |
| |
| /** |
| * Returns if the service is configured i.e. at least event types of interest |
| * and feedback type must be set. |
| * |
| * @return True if the service is configured, false otherwise. |
| */ |
| public boolean isConfigured() { |
| return (mEventTypes != 0 && mFeedbackType != 0 && mService != null); |
| } |
| |
| public void setServiceInfo(AccessibilityServiceInfo info) { |
| mCaller.obtainMessageOO(DO_SET_SERVICE_INFO, info, this).sendToTarget(); |
| } |
| |
| public void onServiceConnected(ComponentName componentName, IBinder service) { |
| mService = service; |
| mServiceInterface = IEventListener.Stub.asInterface(service); |
| try { |
| mServiceInterface.setConnection(this); |
| synchronized (mLock) { |
| tryAddServiceLocked(this); |
| } |
| } catch (RemoteException re) { |
| Slog.w(LOG_TAG, "Error while setting Controller for service: " + service, re); |
| } |
| } |
| |
| public AccessibilityNodeInfo findAccessibilityNodeInfoByViewIdInActiveWindow(int viewId) { |
| IAccessibilityInteractionConnection connection = null; |
| synchronized (mLock) { |
| final boolean permissionGranted = mSecurityPolicy.canRetrieveWindowContent(this); |
| if (permissionGranted) { |
| connection = getConnectionToRetrievalAllowingWindowLocked(); |
| } |
| } |
| if (connection == null) { |
| if (DEBUG) { |
| Slog.e(LOG_TAG, "No interaction connection to a retrieve allowing window."); |
| } |
| return null; |
| } |
| final long identityToken = Binder.clearCallingIdentity(); |
| try { |
| final int interactionId = mInteractionIdCounter.getAndIncrement(); |
| connection.findAccessibilityNodeInfoByViewId(viewId, interactionId, mCallback); |
| AccessibilityNodeInfo info = mCallback.getFindAccessibilityNodeInfoResultAndClear( |
| interactionId); |
| if (info != null) { |
| applyCompatibilityScaleIfNeeded(info); |
| info.setConnection(this); |
| info.setSealed(true); |
| } |
| return info; |
| } catch (RemoteException re) { |
| if (DEBUG) { |
| Slog.e(LOG_TAG, "Error finding node."); |
| } |
| } finally { |
| Binder.restoreCallingIdentity(identityToken); |
| } |
| return null; |
| } |
| |
| public List<AccessibilityNodeInfo> findAccessibilityNodeInfosByViewTextInActiveWindow( |
| String text) { |
| return findAccessibilityNodeInfosByViewText(text, |
| mSecurityPolicy.mRetrievalAlowingWindowId, View.NO_ID); |
| } |
| |
| public List<AccessibilityNodeInfo> findAccessibilityNodeInfosByViewText(String text, |
| int accessibilityWindowId, int accessibilityViewId) { |
| IAccessibilityInteractionConnection connection = null; |
| synchronized (mLock) { |
| final boolean permissionGranted = |
| mSecurityPolicy.canGetAccessibilityNodeInfoLocked(this, accessibilityWindowId); |
| if (permissionGranted) { |
| connection = getConnectionToRetrievalAllowingWindowLocked(); |
| } |
| } |
| if (connection == null) { |
| if (DEBUG) { |
| Slog.e(LOG_TAG, "No interaction connection to focused window."); |
| } |
| return null; |
| } |
| final long identityToken = Binder.clearCallingIdentity(); |
| try { |
| final int interactionId = mInteractionIdCounter.getAndIncrement(); |
| connection.findAccessibilityNodeInfosByViewText(text, accessibilityViewId, |
| interactionId, mCallback); |
| List<AccessibilityNodeInfo> infos = |
| mCallback.getFindAccessibilityNodeInfosResultAndClear(interactionId); |
| if (infos != null) { |
| final int infoCount = infos.size(); |
| for (int i = 0; i < infoCount; i++) { |
| AccessibilityNodeInfo info = infos.get(i); |
| applyCompatibilityScaleIfNeeded(info); |
| info.setConnection(this); |
| info.setSealed(true); |
| } |
| } |
| return infos; |
| } catch (RemoteException re) { |
| if (DEBUG) { |
| Slog.e(LOG_TAG, "Error finding node."); |
| } |
| } finally { |
| Binder.restoreCallingIdentity(identityToken); |
| } |
| return null; |
| } |
| |
| public AccessibilityNodeInfo findAccessibilityNodeInfoByAccessibilityId( |
| int accessibilityWindowId, int accessibilityViewId) { |
| IAccessibilityInteractionConnection connection = null; |
| synchronized (mLock) { |
| final boolean permissionGranted = |
| mSecurityPolicy.canGetAccessibilityNodeInfoLocked(this, accessibilityWindowId); |
| if (permissionGranted) { |
| connection = mWindowIdToInteractionConnectionMap.get(accessibilityWindowId); |
| } |
| } |
| if (connection == null) { |
| if (DEBUG) { |
| Slog.e(LOG_TAG, "No interaction connection to window: " |
| + accessibilityWindowId); |
| } |
| return null; |
| } |
| final long identityToken = Binder.clearCallingIdentity(); |
| try { |
| final int interactionId = mInteractionIdCounter.getAndIncrement(); |
| connection.findAccessibilityNodeInfoByAccessibilityId(accessibilityViewId, |
| interactionId, mCallback); |
| AccessibilityNodeInfo info = |
| mCallback.getFindAccessibilityNodeInfoResultAndClear(interactionId); |
| if (info != null) { |
| applyCompatibilityScaleIfNeeded(info); |
| info.setConnection(this); |
| info.setSealed(true); |
| } |
| return info; |
| } catch (RemoteException re) { |
| if (DEBUG) { |
| Slog.e(LOG_TAG, "Error requesting node with accessibilityViewId: " |
| + accessibilityViewId); |
| } |
| } finally { |
| Binder.restoreCallingIdentity(identityToken); |
| } |
| return null; |
| } |
| |
| public boolean performAccessibilityAction(int accessibilityWindowId, |
| int accessibilityViewId, int action) { |
| IAccessibilityInteractionConnection connection = null; |
| synchronized (mLock) { |
| final boolean permissionGranted = mSecurityPolicy.canPerformActionLocked(this, |
| accessibilityWindowId, action); |
| if (permissionGranted) { |
| connection = mWindowIdToInteractionConnectionMap.get(accessibilityWindowId); |
| } |
| } |
| if (connection == null) { |
| if (DEBUG) { |
| Slog.e(LOG_TAG, "No interaction connection to window: " |
| + accessibilityWindowId); |
| } |
| return false; |
| } |
| final long identityToken = Binder.clearCallingIdentity(); |
| try { |
| final int interactionId = mInteractionIdCounter.getAndIncrement(); |
| connection.performAccessibilityAction(accessibilityViewId, action, interactionId, |
| mCallback); |
| return mCallback.getPerformAccessibilityActionResult(interactionId); |
| } catch (RemoteException re) { |
| if (DEBUG) { |
| Slog.e(LOG_TAG, "Error requesting node with accessibilityViewId: " |
| + accessibilityViewId); |
| } |
| } finally { |
| Binder.restoreCallingIdentity(identityToken); |
| } |
| return false; |
| } |
| |
| public void onServiceDisconnected(ComponentName componentName) { |
| /* do nothing - #binderDied takes care */ |
| } |
| |
| public void linkToOwnDeath() throws RemoteException { |
| mService.linkToDeath(this, 0); |
| } |
| |
| public void unlinkToOwnDeath() { |
| mService.unlinkToDeath(this, 0); |
| } |
| |
| public void binderDied() { |
| synchronized (mLock) { |
| tryRemoveServiceLocked(this); |
| } |
| } |
| |
| private IAccessibilityInteractionConnection getConnectionToRetrievalAllowingWindowLocked() { |
| final int windowId = mSecurityPolicy.getRetrievalAllowingWindowLocked(); |
| if (DEBUG) { |
| Slog.i(LOG_TAG, "Trying to get interaction connection to windowId: " + windowId); |
| } |
| return mWindowIdToInteractionConnectionMap.get(windowId); |
| } |
| |
| private void applyCompatibilityScaleIfNeeded(AccessibilityNodeInfo info) { |
| IBinder windowToken = mWindowIdToWindowTokenMap.get(info.getWindowId()); |
| final float scale = mWindowManagerService.getWindowCompatibilityScale(windowToken); |
| |
| if (Float.compare(scale, 1.0f) == 0) { |
| return; |
| } |
| |
| Rect bounds = mTempBounds; |
| info.getBoundsInParent(bounds); |
| bounds.scale(scale); |
| info.setBoundsInParent(bounds); |
| |
| info.getBoundsInScreen(bounds); |
| bounds.scale(scale); |
| info.setBoundsInScreen(bounds); |
| } |
| } |
| |
| final class SecurityPolicy { |
| private static final int VALID_ACTIONS = AccessibilityNodeInfo.ACTION_FOCUS |
| | AccessibilityNodeInfo.ACTION_CLEAR_FOCUS | AccessibilityNodeInfo.ACTION_SELECT |
| | AccessibilityNodeInfo.ACTION_CLEAR_SELECTION; |
| |
| private static final int RETRIEVAL_ALLOWING_EVENT_TYPES = |
| AccessibilityEvent.TYPE_TOUCH_EXPLORATION_GESTURE_END |
| | AccessibilityEvent.TYPE_TOUCH_EXPLORATION_GESTURE_START |
| | AccessibilityEvent.TYPE_VIEW_CLICKED | AccessibilityEvent.TYPE_VIEW_FOCUSED |
| | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT |
| | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED |
| | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED | AccessibilityEvent.TYPE_VIEW_SELECTED |
| | AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED; |
| |
| private int mRetrievalAlowingWindowId; |
| |
| private boolean canDispatchAccessibilityEvent(AccessibilityEvent event) { |
| // Send window changed event only for the retrieval allowing window. |
| return (event.getEventType() != AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED |
| || event.getWindowId() == mRetrievalAlowingWindowId); |
| } |
| |
| public void updateRetrievalAllowingWindowAndEventSourceLocked(AccessibilityEvent event) { |
| final int windowId = event.getWindowId(); |
| final int eventType = event.getEventType(); |
| if ((eventType & RETRIEVAL_ALLOWING_EVENT_TYPES) != 0) { |
| mRetrievalAlowingWindowId = windowId; |
| } else { |
| event.setSource(null); |
| } |
| } |
| |
| public int getRetrievalAllowingWindowLocked() { |
| return mRetrievalAlowingWindowId; |
| } |
| |
| public boolean canGetAccessibilityNodeInfoLocked(Service service, int windowId) { |
| return canRetrieveWindowContent(service) && isRetrievalAllowingWindow(windowId); |
| } |
| |
| public boolean canPerformActionLocked(Service service, int windowId, int action) { |
| return canRetrieveWindowContent(service) |
| && isRetrievalAllowingWindow(windowId) |
| && isActionPermitted(action); |
| } |
| |
| public boolean canRetrieveWindowContent(Service service) { |
| return service.mCanRetrieveScreenContent; |
| } |
| |
| private boolean isRetrievalAllowingWindow(int windowId) { |
| return (mRetrievalAlowingWindowId == windowId); |
| } |
| |
| private boolean isActionPermitted(int action) { |
| return (VALID_ACTIONS & action) != 0; |
| } |
| |
| private void enforceCallingPermission(String permission, String function) { |
| if (OWN_PROCESS_ID == Binder.getCallingPid()) { |
| return; |
| } |
| final int permissionStatus = mContext.checkCallingPermission(permission); |
| if (permissionStatus != PackageManager.PERMISSION_GRANTED) { |
| throw new SecurityException("You do not have " + permission |
| + " required to call " + function); |
| } |
| } |
| } |
| |
| final class Callback extends IAccessibilityInteractionConnectionCallback.Stub { |
| private static final long TIMEOUT_INTERACTION_MILLIS = 5000; |
| |
| private int mInteractionId = -1; |
| private AccessibilityNodeInfo mFindAccessibilityNodeInfoResult; |
| private List<AccessibilityNodeInfo> mFindAccessibilityNodeInfosResult; |
| private boolean mPerformAccessibilityActionResult; |
| |
| public void setFindAccessibilityNodeInfoResult(AccessibilityNodeInfo info, |
| int interactionId) { |
| synchronized (mLock) { |
| if (interactionId > mInteractionId) { |
| mFindAccessibilityNodeInfoResult = info; |
| mInteractionId = interactionId; |
| } |
| mLock.notifyAll(); |
| } |
| } |
| |
| public AccessibilityNodeInfo getFindAccessibilityNodeInfoResultAndClear(int interactionId) { |
| synchronized (mLock) { |
| waitForResultTimedLocked(TIMEOUT_INTERACTION_MILLIS, interactionId); |
| AccessibilityNodeInfo result = mFindAccessibilityNodeInfoResult; |
| clearLocked(); |
| return result; |
| } |
| } |
| |
| public void setFindAccessibilityNodeInfosResult(List<AccessibilityNodeInfo> infos, |
| int interactionId) { |
| synchronized (mLock) { |
| if (interactionId > mInteractionId) { |
| mFindAccessibilityNodeInfosResult = infos; |
| mInteractionId = interactionId; |
| } |
| mLock.notifyAll(); |
| } |
| } |
| |
| public List<AccessibilityNodeInfo> getFindAccessibilityNodeInfosResultAndClear( |
| int interactionId) { |
| synchronized (mLock) { |
| waitForResultTimedLocked(TIMEOUT_INTERACTION_MILLIS, interactionId); |
| List<AccessibilityNodeInfo> result = mFindAccessibilityNodeInfosResult; |
| clearLocked(); |
| return result; |
| } |
| } |
| |
| public void setPerformAccessibilityActionResult(boolean succeeded, int interactionId) { |
| synchronized (mLock) { |
| if (interactionId > mInteractionId) { |
| mPerformAccessibilityActionResult = succeeded; |
| mInteractionId = interactionId; |
| } |
| mLock.notifyAll(); |
| } |
| } |
| |
| public boolean getPerformAccessibilityActionResult(int interactionId) { |
| synchronized (mLock) { |
| waitForResultTimedLocked(TIMEOUT_INTERACTION_MILLIS, interactionId); |
| final boolean result = mPerformAccessibilityActionResult; |
| clearLocked(); |
| return result; |
| } |
| } |
| |
| public void clearLocked() { |
| mInteractionId = -1; |
| mFindAccessibilityNodeInfoResult = null; |
| mFindAccessibilityNodeInfosResult = null; |
| mPerformAccessibilityActionResult = false; |
| } |
| |
| private void waitForResultTimedLocked(long waitTimeMillis, int interactionId) { |
| final long startTimeMillis = SystemClock.uptimeMillis(); |
| while (true) { |
| try { |
| if (mInteractionId == interactionId) { |
| return; |
| } |
| final long elapsedTimeMillis = SystemClock.uptimeMillis() - startTimeMillis; |
| waitTimeMillis = TIMEOUT_INTERACTION_MILLIS - elapsedTimeMillis; |
| if (waitTimeMillis <= 0) { |
| return; |
| } |
| mLock.wait(waitTimeMillis); |
| } catch (InterruptedException ie) { |
| /* ignore */ |
| } |
| } |
| } |
| } |
| } |