Move towards a formal public API for backup and restore

This commit makes a few changes towards establishing a formal application
interface for interacting with the backup/restore mechanism:

1. Introduce public wrapper classes around the various binder interfaces; 3rd
party code will never see the binders directly.

2. Progress update callbacks during a restore sequence now occur on the main
thread, not in a binder thread [and not with system-process permissions!].

3. Rename the BackupManagerService's inner "RestoreSession" class to avoid
ambiguity with the new public "RestoreSession" class.

1 files changed, 4 insertions, 4 deletions

diff --git a/services/java/com/android/server/BackupManagerService.java b/services/java/com/android/server/BackupManagerService.java
index 2e45512..72e26f8 100644
--- a/services/java/com/android/server/BackupManagerService.java
+++ b/services/java/com/android/server/BackupManagerService.java
@@ -161,7 +161,7 @@ class BackupManagerService extends IBackupManager.Stub {
             = new HashMap<String,IBackupTransport>();
     String mCurrentTransport;
     IBackupTransport mLocalTransport, mGoogleTransport;
-    RestoreSession mActiveRestoreSession;
+    ActiveRestoreSession mActiveRestoreSession;
 
     class RestoreParams {
         public IBackupTransport transport;
@@ -2068,20 +2068,20 @@ class BackupManagerService extends IBackupManager.Stub {
                 Log.d(TAG, "Restore session requested but one already active");
                 return null;
             }
-            mActiveRestoreSession = new RestoreSession(transport);
+            mActiveRestoreSession = new ActiveRestoreSession(transport);
         }
         return mActiveRestoreSession;
     }
 
     // ----- Restore session -----
 
-    class RestoreSession extends IRestoreSession.Stub {
+    class ActiveRestoreSession extends IRestoreSession.Stub {
         private static final String TAG = "RestoreSession";
 
         private IBackupTransport mRestoreTransport = null;
         RestoreSet[] mRestoreSets = null;
 
-        RestoreSession(String transport) {
+        ActiveRestoreSession(String transport) {
             mRestoreTransport = getTransport(transport);
         }