svetoslavganov | 75986cf | 2009-05-14 22:28:01 -0700 | [diff] [blame] | 1 | /* |
| 2 | ** Copyright 2009, The Android Open Source Project |
| 3 | ** |
| 4 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | ** you may not use this file except in compliance with the License. |
| 6 | ** You may obtain a copy of the License at |
| 7 | ** |
| 8 | ** http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | ** |
| 10 | ** Unless required by applicable law or agreed to in writing, software |
| 11 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | ** See the License for the specific language governing permissions and |
| 14 | ** limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.server; |
| 18 | |
| 19 | import static android.util.Config.LOGV; |
| 20 | |
| 21 | import com.android.internal.os.HandlerCaller; |
| 22 | import com.android.internal.os.HandlerCaller.SomeArgs; |
| 23 | |
| 24 | import android.accessibilityservice.AccessibilityService; |
| 25 | import android.accessibilityservice.AccessibilityServiceInfo; |
| 26 | import android.accessibilityservice.IAccessibilityServiceConnection; |
| 27 | import android.accessibilityservice.IEventListener; |
Dianne Hackborn | dd9b82c | 2009-09-03 00:18:47 -0700 | [diff] [blame] | 28 | import android.app.PendingIntent; |
svetoslavganov | 75986cf | 2009-05-14 22:28:01 -0700 | [diff] [blame] | 29 | import android.content.BroadcastReceiver; |
| 30 | import android.content.ComponentName; |
| 31 | import android.content.ContentResolver; |
| 32 | import android.content.Context; |
| 33 | import android.content.Intent; |
| 34 | import android.content.IntentFilter; |
| 35 | import android.content.ServiceConnection; |
| 36 | import android.content.pm.PackageManager; |
| 37 | import android.content.pm.ResolveInfo; |
| 38 | import android.content.pm.ServiceInfo; |
| 39 | import android.database.ContentObserver; |
| 40 | import android.net.Uri; |
| 41 | import android.os.Binder; |
| 42 | import android.os.DeadObjectException; |
| 43 | import android.os.Handler; |
| 44 | import android.os.IBinder; |
| 45 | import android.os.Message; |
| 46 | import android.os.RemoteException; |
| 47 | import android.provider.Settings; |
| 48 | import android.text.TextUtils; |
| 49 | import android.text.TextUtils.SimpleStringSplitter; |
| 50 | import android.util.Log; |
| 51 | import android.util.SparseArray; |
| 52 | import android.view.accessibility.AccessibilityEvent; |
| 53 | import android.view.accessibility.IAccessibilityManager; |
| 54 | import android.view.accessibility.IAccessibilityManagerClient; |
| 55 | |
| 56 | import java.util.ArrayList; |
| 57 | import java.util.Arrays; |
| 58 | import java.util.HashMap; |
| 59 | import java.util.HashSet; |
| 60 | import java.util.List; |
| 61 | import java.util.Map; |
| 62 | import java.util.Set; |
| 63 | |
| 64 | /** |
| 65 | * This class is instantiated by the system as a system level service and can be |
| 66 | * accessed only by the system. The task of this service is to be a centralized |
| 67 | * event dispatch for {@link AccessibilityEvent}s generated across all processes |
| 68 | * on the device. Events are dispatched to {@link AccessibilityService}s. |
| 69 | * |
| 70 | * @hide |
| 71 | */ |
| 72 | public class AccessibilityManagerService extends IAccessibilityManager.Stub |
| 73 | implements HandlerCaller.Callback { |
| 74 | |
| 75 | private static final String LOG_TAG = "AccessibilityManagerService"; |
| 76 | |
| 77 | private static int sIdCounter = 0; |
| 78 | |
| 79 | private static final int OWN_PROCESS_ID = android.os.Process.myPid(); |
| 80 | |
| 81 | private static final int DO_SET_SERVICE_INFO = 10; |
| 82 | |
| 83 | final HandlerCaller mCaller; |
| 84 | |
| 85 | final Context mContext; |
| 86 | |
| 87 | final Object mLock = new Object(); |
| 88 | |
| 89 | final List<Service> mServices = new ArrayList<Service>(); |
| 90 | |
| 91 | final List<IAccessibilityManagerClient> mClients = |
| 92 | new ArrayList<IAccessibilityManagerClient>(); |
| 93 | |
| 94 | final Map<ComponentName, Service> mComponentNameToServiceMap = |
| 95 | new HashMap<ComponentName, Service>(); |
| 96 | |
| 97 | private final List<ServiceInfo> mInstalledServices = new ArrayList<ServiceInfo>(); |
| 98 | |
| 99 | private final Set<ComponentName> mEnabledServices = new HashSet<ComponentName>(); |
| 100 | |
| 101 | private final SimpleStringSplitter mStringColonSplitter = new SimpleStringSplitter(':'); |
| 102 | |
| 103 | private PackageManager mPackageManager; |
| 104 | |
| 105 | private int mHandledFeedbackTypes = 0; |
| 106 | |
| 107 | private boolean mIsEnabled; |
| 108 | |
| 109 | /** |
| 110 | * Handler for delayed event dispatch. |
| 111 | */ |
| 112 | private Handler mHandler = new Handler() { |
| 113 | |
| 114 | @Override |
| 115 | public void handleMessage(Message message) { |
| 116 | Service service = (Service) message.obj; |
| 117 | int eventType = message.arg1; |
| 118 | |
| 119 | synchronized (mLock) { |
| 120 | notifyEventListenerLocked(service, eventType); |
| 121 | AccessibilityEvent oldEvent = service.mPendingEvents.get(eventType); |
| 122 | service.mPendingEvents.remove(eventType); |
| 123 | tryRecycleLocked(oldEvent); |
| 124 | } |
| 125 | } |
| 126 | }; |
| 127 | |
| 128 | /** |
| 129 | * Creates a new instance. |
| 130 | * |
| 131 | * @param context A {@link Context} instance. |
| 132 | */ |
| 133 | AccessibilityManagerService(Context context) { |
| 134 | mContext = context; |
| 135 | mPackageManager = mContext.getPackageManager(); |
| 136 | mCaller = new HandlerCaller(context, this); |
| 137 | |
| 138 | registerPackageChangeAndBootCompletedBroadcastReceiver(); |
| 139 | registerSettingsContentObservers(); |
| 140 | |
| 141 | synchronized (mLock) { |
| 142 | populateAccessibilityServiceListLocked(); |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | /** |
| 147 | * Registers a {@link BroadcastReceiver} for the events of |
| 148 | * adding/changing/removing/restarting a package and boot completion. |
| 149 | */ |
| 150 | private void registerPackageChangeAndBootCompletedBroadcastReceiver() { |
| 151 | Context context = mContext; |
| 152 | |
| 153 | BroadcastReceiver broadcastReceiver = new BroadcastReceiver() { |
| 154 | @Override |
| 155 | public void onReceive(Context context, Intent intent) { |
| 156 | synchronized (mLock) { |
| 157 | populateAccessibilityServiceListLocked(); |
| 158 | manageServicesLocked(); |
| 159 | |
| 160 | if (intent.getAction() == Intent.ACTION_BOOT_COMPLETED) { |
| 161 | mIsEnabled = Settings.Secure.getInt(mContext.getContentResolver(), |
| 162 | Settings.Secure.ACCESSIBILITY_ENABLED, 0) == 1; |
| 163 | updateClientsLocked(); |
| 164 | } |
| 165 | } |
| 166 | } |
| 167 | }; |
| 168 | |
| 169 | // package changes |
| 170 | IntentFilter packageFilter = new IntentFilter(); |
| 171 | packageFilter.addAction(Intent.ACTION_PACKAGE_ADDED); |
| 172 | packageFilter.addAction(Intent.ACTION_PACKAGE_CHANGED); |
| 173 | packageFilter.addAction(Intent.ACTION_PACKAGE_REMOVED); |
| 174 | packageFilter.addAction(Intent.ACTION_PACKAGE_RESTARTED); |
| 175 | packageFilter.addDataScheme("package"); |
| 176 | context.registerReceiver(broadcastReceiver, packageFilter); |
Suchi Amalapurapu | 08675a3 | 2010-01-28 09:57:30 -0800 | [diff] [blame] | 177 | // Register for events related to sdcard installation. |
| 178 | IntentFilter sdFilter = new IntentFilter(); |
Suchi Amalapurapu | b56ae20 | 2010-02-04 22:51:07 -0800 | [diff] [blame^] | 179 | sdFilter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_AVAILABLE); |
| 180 | sdFilter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_UNAVAILABLE); |
Suchi Amalapurapu | 08675a3 | 2010-01-28 09:57:30 -0800 | [diff] [blame] | 181 | mContext.registerReceiver(broadcastReceiver, sdFilter); |
svetoslavganov | 75986cf | 2009-05-14 22:28:01 -0700 | [diff] [blame] | 182 | |
| 183 | // boot completed |
| 184 | IntentFilter bootFiler = new IntentFilter(Intent.ACTION_BOOT_COMPLETED); |
| 185 | mContext.registerReceiver(broadcastReceiver, bootFiler); |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * {@link ContentObserver}s for {@link Settings.Secure#ACCESSIBILITY_ENABLED} |
| 190 | * and {@link Settings.Secure#ENABLED_ACCESSIBILITY_SERVICES} settings. |
| 191 | */ |
| 192 | private void registerSettingsContentObservers() { |
| 193 | ContentResolver contentResolver = mContext.getContentResolver(); |
| 194 | |
| 195 | Uri enabledUri = Settings.Secure.getUriFor(Settings.Secure.ACCESSIBILITY_ENABLED); |
| 196 | contentResolver.registerContentObserver(enabledUri, false, |
| 197 | new ContentObserver(new Handler()) { |
| 198 | @Override |
| 199 | public void onChange(boolean selfChange) { |
| 200 | super.onChange(selfChange); |
| 201 | |
| 202 | mIsEnabled = Settings.Secure.getInt(mContext.getContentResolver(), |
| 203 | Settings.Secure.ACCESSIBILITY_ENABLED, 0) == 1; |
| 204 | |
| 205 | synchronized (mLock) { |
| 206 | if (mIsEnabled) { |
| 207 | manageServicesLocked(); |
| 208 | } else { |
| 209 | unbindAllServicesLocked(); |
| 210 | } |
| 211 | updateClientsLocked(); |
| 212 | } |
| 213 | } |
| 214 | }); |
| 215 | |
| 216 | Uri providersUri = |
| 217 | Settings.Secure.getUriFor(Settings.Secure.ENABLED_ACCESSIBILITY_SERVICES); |
| 218 | contentResolver.registerContentObserver(providersUri, false, |
| 219 | new ContentObserver(new Handler()) { |
| 220 | @Override |
| 221 | public void onChange(boolean selfChange) { |
| 222 | super.onChange(selfChange); |
| 223 | |
| 224 | synchronized (mLock) { |
| 225 | manageServicesLocked(); |
| 226 | } |
| 227 | } |
| 228 | }); |
| 229 | } |
| 230 | |
| 231 | public void addClient(IAccessibilityManagerClient client) { |
| 232 | synchronized (mLock) { |
| 233 | try { |
| 234 | client.setEnabled(mIsEnabled); |
| 235 | mClients.add(client); |
| 236 | } catch (RemoteException re) { |
| 237 | Log.w(LOG_TAG, "Dead AccessibilityManagerClient: " + client, re); |
| 238 | } |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | public boolean sendAccessibilityEvent(AccessibilityEvent event) { |
| 243 | synchronized (mLock) { |
| 244 | notifyAccessibilityServicesDelayedLocked(event, false); |
| 245 | notifyAccessibilityServicesDelayedLocked(event, true); |
| 246 | } |
| 247 | // event not scheduled for dispatch => recycle |
| 248 | if (mHandledFeedbackTypes == 0) { |
| 249 | event.recycle(); |
| 250 | } else { |
| 251 | mHandledFeedbackTypes = 0; |
| 252 | } |
| 253 | |
| 254 | return (OWN_PROCESS_ID != Binder.getCallingPid()); |
| 255 | } |
| 256 | |
| 257 | public List<ServiceInfo> getAccessibilityServiceList() { |
| 258 | synchronized (mLock) { |
| 259 | return mInstalledServices; |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | public void interrupt() { |
| 264 | synchronized (mLock) { |
| 265 | for (int i = 0, count = mServices.size(); i < count; i++) { |
| 266 | Service service = mServices.get(i); |
| 267 | try { |
| 268 | service.mServiceInterface.onInterrupt(); |
| 269 | } catch (RemoteException re) { |
| 270 | if (re instanceof DeadObjectException) { |
| 271 | Log.w(LOG_TAG, "Dead " + service.mService + ". Cleaning up."); |
| 272 | if (removeDeadServiceLocked(service)) { |
| 273 | count--; |
| 274 | i--; |
| 275 | } |
| 276 | } else { |
| 277 | Log.e(LOG_TAG, "Error during sending interrupt request to " |
| 278 | + service.mService, re); |
| 279 | } |
| 280 | } |
| 281 | } |
| 282 | } |
| 283 | } |
| 284 | |
| 285 | public void executeMessage(Message message) { |
| 286 | switch (message.what) { |
| 287 | case DO_SET_SERVICE_INFO: |
| 288 | SomeArgs arguments = ((SomeArgs) message.obj); |
| 289 | |
| 290 | AccessibilityServiceInfo info = (AccessibilityServiceInfo) arguments.arg1; |
| 291 | Service service = (Service) arguments.arg2; |
| 292 | |
| 293 | synchronized (mLock) { |
| 294 | service.mEventTypes = info.eventTypes; |
| 295 | service.mFeedbackType = info.feedbackType; |
| 296 | String[] packageNames = info.packageNames; |
| 297 | if (packageNames != null) { |
| 298 | service.mPackageNames.addAll(Arrays.asList(packageNames)); |
| 299 | } |
| 300 | service.mNotificationTimeout = info.notificationTimeout; |
| 301 | service.mIsDefault = (info.flags & AccessibilityServiceInfo.DEFAULT) != 0; |
| 302 | } |
| 303 | return; |
| 304 | default: |
| 305 | Log.w(LOG_TAG, "Unknown message type: " + message.what); |
| 306 | } |
| 307 | } |
| 308 | |
| 309 | /** |
| 310 | * Populates the cached list of installed {@link AccessibilityService}s. |
| 311 | */ |
| 312 | private void populateAccessibilityServiceListLocked() { |
| 313 | mInstalledServices.clear(); |
| 314 | |
| 315 | List<ResolveInfo> installedServices = mPackageManager.queryIntentServices( |
| 316 | new Intent(AccessibilityService.SERVICE_INTERFACE), PackageManager.GET_SERVICES); |
| 317 | |
| 318 | for (int i = 0, count = installedServices.size(); i < count; i++) { |
| 319 | mInstalledServices.add(installedServices.get(i).serviceInfo); |
| 320 | } |
| 321 | } |
| 322 | |
| 323 | /** |
| 324 | * Performs {@link AccessibilityService}s delayed notification. The delay is configurable |
| 325 | * and denotes the period after the last event before notifying the service. |
| 326 | * |
| 327 | * @param event The event. |
| 328 | * @param isDefault True to notify default listeners, not default services. |
| 329 | */ |
| 330 | private void notifyAccessibilityServicesDelayedLocked(AccessibilityEvent event, |
| 331 | boolean isDefault) { |
Charles Chen | 85b598b | 2009-07-29 17:23:50 -0700 | [diff] [blame] | 332 | try { |
| 333 | for (int i = 0, count = mServices.size(); i < count; i++) { |
| 334 | Service service = mServices.get(i); |
svetoslavganov | 75986cf | 2009-05-14 22:28:01 -0700 | [diff] [blame] | 335 | |
Charles Chen | 85b598b | 2009-07-29 17:23:50 -0700 | [diff] [blame] | 336 | if (service.mIsDefault == isDefault) { |
| 337 | if (canDispathEventLocked(service, event, mHandledFeedbackTypes)) { |
| 338 | mHandledFeedbackTypes |= service.mFeedbackType; |
| 339 | notifyAccessibilityServiceDelayedLocked(service, event); |
| 340 | } |
svetoslavganov | 75986cf | 2009-05-14 22:28:01 -0700 | [diff] [blame] | 341 | } |
| 342 | } |
Charles Chen | 85b598b | 2009-07-29 17:23:50 -0700 | [diff] [blame] | 343 | } catch (IndexOutOfBoundsException oobe) { |
| 344 | // An out of bounds exception can happen if services are going away |
| 345 | // as the for loop is running. If that happens, just bail because |
| 346 | // there are no more services to notify. |
| 347 | return; |
svetoslavganov | 75986cf | 2009-05-14 22:28:01 -0700 | [diff] [blame] | 348 | } |
| 349 | } |
| 350 | |
| 351 | /** |
| 352 | * Performs an {@link AccessibilityService} delayed notification. The delay is configurable |
| 353 | * and denotes the period after the last event before notifying the service. |
| 354 | * |
| 355 | * @param service The service. |
| 356 | * @param event The event. |
| 357 | */ |
| 358 | private void notifyAccessibilityServiceDelayedLocked(Service service, |
| 359 | AccessibilityEvent event) { |
| 360 | synchronized (mLock) { |
| 361 | int eventType = event.getEventType(); |
| 362 | AccessibilityEvent oldEvent = service.mPendingEvents.get(eventType); |
| 363 | service.mPendingEvents.put(eventType, event); |
| 364 | |
| 365 | int what = eventType | (service.mId << 16); |
| 366 | if (oldEvent != null) { |
| 367 | mHandler.removeMessages(what); |
| 368 | tryRecycleLocked(oldEvent); |
| 369 | } |
| 370 | |
| 371 | Message message = mHandler.obtainMessage(what, service); |
| 372 | message.arg1 = event.getEventType(); |
| 373 | mHandler.sendMessageDelayed(message, service.mNotificationTimeout); |
| 374 | } |
| 375 | } |
| 376 | |
| 377 | /** |
| 378 | * Recycles an event if it can be safely recycled. The condition is that no |
| 379 | * not notified service is interested in the event. |
| 380 | * |
| 381 | * @param event The event. |
| 382 | */ |
| 383 | private void tryRecycleLocked(AccessibilityEvent event) { |
Charles Chen | bbc1934 | 2009-07-24 16:06:09 -0700 | [diff] [blame] | 384 | if (event == null) { |
| 385 | return; |
| 386 | } |
svetoslavganov | 75986cf | 2009-05-14 22:28:01 -0700 | [diff] [blame] | 387 | int eventType = event.getEventType(); |
| 388 | List<Service> services = mServices; |
| 389 | |
| 390 | // linear in the number of service which is not large |
| 391 | for (int i = 0, count = services.size(); i < count; i++) { |
| 392 | Service service = services.get(i); |
| 393 | if (service.mPendingEvents.get(eventType) == event) { |
| 394 | return; |
| 395 | } |
| 396 | } |
svetoslavganov | 75986cf | 2009-05-14 22:28:01 -0700 | [diff] [blame] | 397 | event.recycle(); |
| 398 | } |
| 399 | |
| 400 | /** |
| 401 | * Notifies a service for a scheduled event given the event type. |
| 402 | * |
| 403 | * @param service The service. |
| 404 | * @param eventType The type of the event to dispatch. |
| 405 | */ |
| 406 | private void notifyEventListenerLocked(Service service, int eventType) { |
| 407 | IEventListener listener = service.mServiceInterface; |
| 408 | AccessibilityEvent event = service.mPendingEvents.get(eventType); |
| 409 | |
| 410 | try { |
| 411 | listener.onAccessibilityEvent(event); |
| 412 | if (LOGV) { |
| 413 | Log.i(LOG_TAG, "Event " + event + " sent to " + listener); |
| 414 | } |
| 415 | } catch (RemoteException re) { |
| 416 | if (re instanceof DeadObjectException) { |
| 417 | Log.w(LOG_TAG, "Dead " + service.mService + ". Cleaning up."); |
| 418 | synchronized (mLock) { |
| 419 | removeDeadServiceLocked(service); |
| 420 | } |
| 421 | } else { |
| 422 | Log.e(LOG_TAG, "Error during sending " + event + " to " + service.mService, re); |
| 423 | } |
| 424 | } |
| 425 | } |
| 426 | |
| 427 | /** |
| 428 | * Removes a dead service. |
| 429 | * |
| 430 | * @param service The service. |
| 431 | * @return True if the service was removed, false otherwise. |
| 432 | */ |
| 433 | private boolean removeDeadServiceLocked(Service service) { |
| 434 | mServices.remove(service); |
| 435 | mHandler.removeMessages(service.mId); |
| 436 | |
| 437 | if (LOGV) { |
| 438 | Log.i(LOG_TAG, "Dead service " + service.mService + " removed"); |
| 439 | } |
| 440 | |
| 441 | if (mServices.isEmpty()) { |
| 442 | mIsEnabled = false; |
| 443 | updateClientsLocked(); |
| 444 | } |
| 445 | |
| 446 | return true; |
| 447 | } |
| 448 | |
| 449 | /** |
| 450 | * Determines if given event can be dispatched to a service based on the package of the |
| 451 | * event source and already notified services for that event type. Specifically, a |
| 452 | * service is notified if it is interested in events from the package and no other service |
| 453 | * providing the same feedback type has been notified. Exception are services the |
| 454 | * provide generic feedback (feedback type left as a safety net for unforeseen feedback |
| 455 | * types) which are always notified. |
| 456 | * |
| 457 | * @param service The potential receiver. |
| 458 | * @param event The event. |
| 459 | * @param handledFeedbackTypes The feedback types for which services have been notified. |
| 460 | * @return True if the listener should be notified, false otherwise. |
| 461 | */ |
| 462 | private boolean canDispathEventLocked(Service service, AccessibilityEvent event, |
| 463 | int handledFeedbackTypes) { |
| 464 | |
| 465 | if (!service.isConfigured()) { |
| 466 | return false; |
| 467 | } |
| 468 | |
| 469 | if (!service.mService.isBinderAlive()) { |
| 470 | removeDeadServiceLocked(service); |
| 471 | return false; |
| 472 | } |
| 473 | |
| 474 | int eventType = event.getEventType(); |
| 475 | if ((service.mEventTypes & eventType) != eventType) { |
| 476 | return false; |
| 477 | } |
| 478 | |
| 479 | Set<String> packageNames = service.mPackageNames; |
| 480 | CharSequence packageName = event.getPackageName(); |
| 481 | |
| 482 | if (packageNames.isEmpty() || packageNames.contains(packageName)) { |
| 483 | int feedbackType = service.mFeedbackType; |
| 484 | if ((handledFeedbackTypes & feedbackType) != feedbackType |
| 485 | || feedbackType == AccessibilityServiceInfo.FEEDBACK_GENERIC) { |
| 486 | return true; |
| 487 | } |
| 488 | } |
| 489 | |
| 490 | return false; |
| 491 | } |
| 492 | |
| 493 | /** |
| 494 | * Manages services by starting enabled ones and stopping disabled ones. |
| 495 | */ |
| 496 | private void manageServicesLocked() { |
| 497 | populateEnabledServicesLocked(mEnabledServices); |
| 498 | updateServicesStateLocked(mInstalledServices, mEnabledServices); |
| 499 | } |
| 500 | |
| 501 | /** |
| 502 | * Unbinds all bound services. |
| 503 | */ |
| 504 | private void unbindAllServicesLocked() { |
| 505 | List<Service> services = mServices; |
| 506 | |
| 507 | for (int i = 0, count = services.size(); i < count; i++) { |
| 508 | Service service = services.get(i); |
| 509 | |
| 510 | service.unbind(); |
| 511 | mComponentNameToServiceMap.remove(service.mComponentName); |
| 512 | } |
| 513 | services.clear(); |
| 514 | } |
| 515 | |
| 516 | /** |
| 517 | * Populates a list with the {@link ComponentName}s of all enabled |
| 518 | * {@link AccessibilityService}s. |
| 519 | * |
| 520 | * @param enabledServices The list. |
| 521 | */ |
| 522 | private void populateEnabledServicesLocked(Set<ComponentName> enabledServices) { |
| 523 | enabledServices.clear(); |
| 524 | |
| 525 | String servicesValue = Settings.Secure.getString(mContext.getContentResolver(), |
| 526 | Settings.Secure.ENABLED_ACCESSIBILITY_SERVICES); |
| 527 | |
| 528 | if (servicesValue != null) { |
| 529 | TextUtils.SimpleStringSplitter splitter = mStringColonSplitter; |
| 530 | splitter.setString(servicesValue); |
| 531 | while (splitter.hasNext()) { |
| 532 | ComponentName enabledService = ComponentName.unflattenFromString(splitter.next()); |
| 533 | enabledServices.add(enabledService); |
| 534 | } |
| 535 | } |
| 536 | } |
| 537 | |
| 538 | /** |
| 539 | * Updates the state of each service by starting (or keeping running) enabled ones and |
| 540 | * stopping the rest. |
| 541 | * |
| 542 | * @param installedServices All installed {@link AccessibilityService}s. |
| 543 | * @param enabledServices The {@link ComponentName}s of the enabled services. |
| 544 | */ |
| 545 | private void updateServicesStateLocked(List<ServiceInfo> installedServices, |
| 546 | Set<ComponentName> enabledServices) { |
| 547 | |
| 548 | Map<ComponentName, Service> componentNameToServiceMap = mComponentNameToServiceMap; |
| 549 | List<Service> services = mServices; |
| 550 | |
| 551 | for (int i = 0, count = installedServices.size(); i < count; i++) { |
| 552 | ServiceInfo intalledService = installedServices.get(i); |
| 553 | ComponentName componentName = new ComponentName(intalledService.packageName, |
| 554 | intalledService.name); |
| 555 | Service service = componentNameToServiceMap.get(componentName); |
| 556 | |
| 557 | if (enabledServices.contains(componentName)) { |
| 558 | if (service == null) { |
| 559 | new Service(componentName).bind(); |
| 560 | } |
| 561 | } else { |
| 562 | if (service != null) { |
| 563 | service.unbind(); |
| 564 | componentNameToServiceMap.remove(componentName); |
| 565 | services.remove(service); |
| 566 | } |
| 567 | } |
| 568 | } |
| 569 | } |
| 570 | |
| 571 | /** |
| 572 | * Updates the state of {@link android.view.accessibility.AccessibilityManager} clients. |
| 573 | */ |
| 574 | private void updateClientsLocked() { |
| 575 | for (int i = 0, count = mClients.size(); i < count; i++) { |
| 576 | try { |
| 577 | mClients.get(i).setEnabled(mIsEnabled); |
| 578 | } catch (RemoteException re) { |
| 579 | mClients.remove(i); |
| 580 | count--; |
| 581 | } |
| 582 | } |
| 583 | } |
| 584 | |
| 585 | /** |
| 586 | * This class represents an accessibility service. It stores all per service |
| 587 | * data required for the service management, provides API for starting/stopping the |
| 588 | * service and is responsible for adding/removing the service in the data structures |
| 589 | * for service management. The class also exposes configuration interface that is |
| 590 | * passed to the service it represents as soon it is bound. It also serves as the |
| 591 | * connection for the service. |
| 592 | */ |
| 593 | class Service extends IAccessibilityServiceConnection.Stub implements ServiceConnection { |
| 594 | int mId = 0; |
| 595 | |
| 596 | IBinder mService; |
| 597 | |
| 598 | IEventListener mServiceInterface; |
| 599 | |
| 600 | int mEventTypes; |
| 601 | |
| 602 | int mFeedbackType; |
| 603 | |
| 604 | Set<String> mPackageNames = new HashSet<String>(); |
| 605 | |
| 606 | boolean mIsDefault; |
| 607 | |
| 608 | long mNotificationTimeout; |
| 609 | |
| 610 | boolean mIsActive; |
| 611 | |
| 612 | ComponentName mComponentName; |
| 613 | |
| 614 | Intent mIntent; |
| 615 | |
| 616 | // the events pending events to be dispatched to this service |
| 617 | final SparseArray<AccessibilityEvent> mPendingEvents = |
| 618 | new SparseArray<AccessibilityEvent>(); |
| 619 | |
| 620 | Service(ComponentName componentName) { |
| 621 | mId = sIdCounter++; |
| 622 | mComponentName = componentName; |
| 623 | mIntent = new Intent().setComponent(mComponentName); |
Dianne Hackborn | dd9b82c | 2009-09-03 00:18:47 -0700 | [diff] [blame] | 624 | mIntent.putExtra(Intent.EXTRA_CLIENT_LABEL, |
| 625 | com.android.internal.R.string.accessibility_binding_label); |
| 626 | mIntent.putExtra(Intent.EXTRA_CLIENT_INTENT, PendingIntent.getActivity( |
| 627 | mContext, 0, new Intent(Settings.ACTION_ACCESSIBILITY_SETTINGS), 0)); |
svetoslavganov | 75986cf | 2009-05-14 22:28:01 -0700 | [diff] [blame] | 628 | } |
| 629 | |
| 630 | /** |
| 631 | * Binds to the accessibility service. |
| 632 | */ |
| 633 | public void bind() { |
| 634 | if (mService == null) { |
| 635 | mContext.bindService(mIntent, this, Context.BIND_AUTO_CREATE); |
| 636 | } |
| 637 | } |
| 638 | |
| 639 | /** |
| 640 | * Unbinds form the accessibility service and removes it from the data |
| 641 | * structures for service management. |
| 642 | */ |
| 643 | public void unbind() { |
| 644 | if (mService != null) { |
| 645 | mContext.unbindService(this); |
| 646 | } |
| 647 | } |
| 648 | |
| 649 | /** |
| 650 | * Returns if the service is configured i.e. at least event types of interest |
| 651 | * and feedback type must be set. |
| 652 | * |
| 653 | * @return True if the service is configured, false otherwise. |
| 654 | */ |
| 655 | public boolean isConfigured() { |
| 656 | return (mEventTypes != 0 && mFeedbackType != 0); |
| 657 | } |
| 658 | |
| 659 | public void setServiceInfo(AccessibilityServiceInfo info) { |
| 660 | mCaller.obtainMessageOO(DO_SET_SERVICE_INFO, info, this).sendToTarget(); |
| 661 | } |
| 662 | |
| 663 | public void onServiceConnected(ComponentName componentName, IBinder service) { |
| 664 | mService = service; |
| 665 | mServiceInterface = IEventListener.Stub.asInterface(service); |
| 666 | |
| 667 | try { |
| 668 | mServiceInterface.setConnection(this); |
| 669 | synchronized (mLock) { |
| 670 | if (!mServices.contains(this)) { |
| 671 | mServices.add(this); |
| 672 | mComponentNameToServiceMap.put(componentName, this); |
| 673 | } |
| 674 | } |
| 675 | } catch (RemoteException re) { |
| 676 | Log.w(LOG_TAG, "Error while setting Controller for service: " + service, re); |
| 677 | } |
| 678 | } |
| 679 | |
| 680 | public void onServiceDisconnected(ComponentName componentName) { |
| 681 | synchronized (mLock) { |
| 682 | Service service = mComponentNameToServiceMap.remove(componentName); |
| 683 | mServices.remove(service); |
| 684 | } |
| 685 | } |
| 686 | } |
| 687 | } |