AccessibilityManagerService not registered for removed packages.

The pakcage monitor in the AccessibilityManagerService was not
watching for packages that are removed. This is needes since
1) we need to remove the package from the enabled accessibility
serivces and clean up after the removed serivice; 2) we need to
disable accessibility if the last access serivices went away.

Change-Id: I06d33b411ce60703e5a2843107323ffc87046c16

Author: sganov

services/java/com/android/server/accessibility/AccessibilityManagerService.java

@@ -189,6 +189,22 @@ public void onSomePackagesChanged() {
                 }
             }
 
+            @Override
+            public void onPackageRemoved(String packageName, int uid) {
+                synchronized (mLock) {
+                    Iterator<ComponentName> it = mEnabledServices.iterator();
+                    while (it.hasNext()) {
+                        ComponentName comp = it.next();
+                        String compPkg = comp.getPackageName();
+                        if (compPkg.equals(packageName)) {
+                            it.remove();
+                            updateEnabledAccessibilitySerivcesSettingLocked(mEnabledServices);
+                            return;
+                        }
+                    }
+                }
+            }
+
             @Override
             public boolean onHandleForceStop(Intent intent, String[] packages,
                     int uid, boolean doit) {
@@ -209,18 +225,7 @@ public boolean onHandleForceStop(Intent intent, String[] packages,
                         }
                     }
                     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();
+                        updateEnabledAccessibilitySerivcesSettingLocked(mEnabledServices);
                     }
                     return false;
                 }
@@ -252,6 +257,21 @@ public void onReceive(Context context, Intent intent) {
 
                 super.onReceive(context, intent);
             }
+
+            private void updateEnabledAccessibilitySerivcesSettingLocked(
+                    Set<ComponentName> enabledServices) {
+                Iterator<ComponentName> it = enabledServices.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());
+            }
         };
 
         // package changes