framework: Privacy Guard

 * Introduce a new privacy feature which allows the user to run an
   application with reduced visibility into his or her personal data.
 * Adds a per-application flag and simple API to determine if this flag
   is enabled for the current or calling process.
 * This flag can be used by content providers to decide if they should
   return a limited/empty dataset.

Change-Id: Id7c54d728e63acb2b02a2a9322930b54949f6c5d

1 files changed, 34 insertions, 0 deletions

diff --git a/services/java/com/android/server/am/ActivityStack.java b/services/java/com/android/server/am/ActivityStack.java
index 885ec89..4e9973f 100644
--- a/services/java/com/android/server/am/ActivityStack.java
+++ b/services/java/com/android/server/am/ActivityStack.java
@@ -1803,9 +1803,43 @@ final class ActivityStack {
             startSpecificActivityLocked(next, true, true);
         }
 
+        handlePrivacyGuardNotification(prev, next);
+
         return true;
     }
 
+    private final void handlePrivacyGuardNotification(ActivityRecord prev, ActivityRecord next) {
+        boolean curPrivacy = false;
+        boolean prevPrivacy = false;
+
+        if (next != null) {
+            try {
+                curPrivacy = AppGlobals.getPackageManager().getPrivacyGuardSetting(
+                        next.packageName, next.userId);
+            } catch (RemoteException e) {
+                // nothing
+            }
+        }
+        if (prev != null) {
+            try {
+                prevPrivacy = AppGlobals.getPackageManager().getPrivacyGuardSetting(
+                        prev.packageName, prev.userId);
+            } catch (RemoteException e) {
+                // nothing
+            }
+        }
+        if (prevPrivacy && !curPrivacy) {
+            Message msg = mService.mHandler.obtainMessage(
+                    ActivityManagerService.CANCEL_PRIVACY_NOTIFICATION_MSG, prev.userId);
+            msg.sendToTarget();
+        } else if ((!prevPrivacy && curPrivacy) ||
+                (prevPrivacy && curPrivacy && !next.packageName.equals(prev.packageName))) {
+            Message msg = mService.mHandler.obtainMessage(
+                    ActivityManagerService.POST_PRIVACY_NOTIFICATION_MSG, next);
+            msg.sendToTarget();
+        }
+    }
+
     private final void startActivityLocked(ActivityRecord r, boolean newTask,
             boolean doResume, boolean keepCurTransition, Bundle options) {
         final int NH = mHistory.size();