Add BackupManager#isBackupServiceActive() system API

So that GMSCore can find out and disable restore flow
and Backup UI.

Bug: 33339643
Test: gts-tradefed run gts -m GtsGmscoreHostTestCases -t com.google.android.gts.devicepolicy.DeviceOwnerTest#testBackupServiceActive (new GTS test in companion CL)
Test: cts-tradefed run cts -m CtsDevicePolicyManagerTestCases -t com.android.cts.devicepolicy.DeviceOwnerTest#testBackupServiceEnabling
Change-Id: I62c38dec2395d3aa926566d128b0067ce7d62c26

diff --git a/api/system-current.txt b/api/system-current.txt
index 762b6e8..ca5f66e 100644 (file)
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -430,6 +430,7 @@ package android.app.backup {
     method public java.lang.String getCurrentTransport();
     method public boolean isAppEligibleForBackup(java.lang.String);
     method public boolean isBackupEnabled();
+    method public boolean isBackupServiceActive(android.os.UserHandle);
     method public java.lang.String[] listAllTransports();
     method public int requestBackup(java.lang.String[], android.app.backup.BackupObserver);
     method public int requestBackup(java.lang.String[], android.app.backup.BackupObserver, android.app.backup.BackupManagerMonitor, int);

diff --git a/core/java/android/app/backup/BackupManager.java b/core/java/android/app/backup/BackupManager.java
index 3a6a5b2..12f4483 100644 (file)
--- a/core/java/android/app/backup/BackupManager.java
+++ b/core/java/android/app/backup/BackupManager.java
@@ -27,6 +27,7 @@ import android.os.Handler;
 import android.os.Message;
 import android.os.RemoteException;
 import android.os.ServiceManager;
+import android.os.UserHandle;
 import android.util.Log;
 import android.util.Pair;
 
@@ -387,6 +388,29 @@ public class BackupManager {
     }
 
     /**
+     * Report whether the backup mechanism is currently active.
+     * When it is inactive, the device will not perform any backup operations, nor will it
+     * deliver data for restore, although clients can still safely call BackupManager methods.
+     *
+     * @hide
+     */
+    @SystemApi
+    @RequiresPermission(android.Manifest.permission.BACKUP)
+    public boolean isBackupServiceActive(UserHandle user) {
+        mContext.enforceCallingPermission(android.Manifest.permission.BACKUP,
+                "isBackupServiceActive");
+        checkServiceBinder();
+        if (sService != null) {
+            try {
+                return sService.isBackupServiceActive(user.getIdentifier());
+            } catch (RemoteException e) {
+                Log.e(TAG, "isBackupEnabled() couldn't connect");
+            }
+        }
+        return false;
+    }
+
+    /**
      * Enable/disable data restore at application install time.  When enabled, app
      * installation will include an attempt to fetch the app's historical data from
      * the archival restore dataset (if any).  When disabled, no such attempt will

diff --git a/services/backup/java/com/android/server/backup/Trampoline.java b/services/backup/java/com/android/server/backup/Trampoline.java
index a628c9d..540f5a1 100644 (file)
--- a/services/backup/java/com/android/server/backup/Trampoline.java
+++ b/services/backup/java/com/android/server/backup/Trampoline.java
@@ -177,12 +177,15 @@ public class Trampoline extends IBackupManager.Stub {
         }
     }
 
+    // IBackupManager binder API
+
     /**
      * Querying activity state of backup service. Calling this method before initialize yields
      * undefined result.
      * @param userHandle The user in which the activity state of backup service is queried.
      * @return true if the service is active.
      */
+    @Override
     public boolean isBackupServiceActive(final int userHandle) {
         // TODO: http://b/22388012
         if (userHandle == UserHandle.USER_SYSTEM) {
@@ -193,7 +196,6 @@ public class Trampoline extends IBackupManager.Stub {
         return false;
     }
 
-    // IBackupManager binder API
     @Override
     public void dataChanged(String packageName) throws RemoteException {
         BackupManagerServiceInterface svc = mService;