Remove backup preferences if backup service is inactive

Also show informative message instead.

Bug: 16641441
Change-Id: I9920c07d56c4c0ccb1f3dce637c0fb390902d2ff

res/values/strings.xml

@@ -4378,6 +4378,10 @@
     <string name="auto_restore_title">Automatic restore</string>
     <!-- Summary text of the "automatic restore" setting -->
     <string name="auto_restore_summary">When reinstalling an app, restore backed up settings and data</string>
+    <!-- Title of the preference informing the user about the backup service being inactive [CHAR LIMIT=50]-->
+    <string name="backup_inactive_title">Backup service is inactive.</string>
+    <!-- Summary text of the preference informing the user about the backup service being inactive, explaining that this is likely set by device policy [CHAR LIMIT=150]-->
+    <string name="backup_inactive_summary">This is set by your device policy.</string>
 
     <!-- Local (desktop) backup password menu title [CHAR LIMIT=25] -->
     <string name="local_backup_password_title">Desktop backup password</string>

res/xml/privacy_settings.xml

@@ -43,6 +43,14 @@
                 android:summary="@string/auto_restore_summary"
                 android:persistent="false" />
 
+        <Preference
+                android:key="backup_inactive"
+                android:title="@string/backup_inactive_title"
+                android:summary="@string/backup_inactive_summary"
+                android:persistent="false"
+                android:enabled="false"
+                android:selectable="false" />
+
     </PreferenceCategory>
 
     <PreferenceCategory android:key="personal_data_category"

src/com/android/settings/PrivacySettings.java

@@ -30,11 +30,13 @@ import android.os.ServiceManager;
 import android.os.UserHandle;
 import android.os.UserManager;
 import android.preference.Preference;
+import android.preference.PreferenceCategory;
 import android.preference.Preference.OnPreferenceChangeListener;
 import android.preference.PreferenceScreen;
 import android.preference.SwitchPreference;
 import android.provider.SearchIndexableResource;
 import android.provider.Settings;
+import android.util.Log;
 
 import com.android.settings.search.BaseSearchIndexProvider;
 import com.android.settings.search.Indexable;
@@ -55,7 +57,9 @@ public class PrivacySettings extends SettingsPreferenceFragment implements
     private static final String BACKUP_DATA = "backup_data";
     private static final String AUTO_RESTORE = "auto_restore";
     private static final String CONFIGURE_ACCOUNT = "configure_account";
+    private static final String BACKUP_INACTIVE = "backup_inactive";
     private static final String PERSONAL_DATA_CATEGORY = "personal_data_category";
+    private static final String TAG = "PrivacySettings";
     private IBackupManager mBackupManager;
     private SwitchPreference mBackup;
     private SwitchPreference mAutoRestore;
@@ -88,15 +92,23 @@ public class PrivacySettings extends SettingsPreferenceFragment implements
 
         mConfigure = (PreferenceScreen) screen.findPreference(CONFIGURE_ACCOUNT);
 
-        if (UserManager.get(getActivity()).hasUserRestriction(
+        ArrayList<String> keysToRemove = getNonVisibleKeys(getActivity());
-                UserManager.DISALLOW_FACTORY_RESET)) {
+        final int screenPreferenceCount = screen.getPreferenceCount();
-            screen.removePreference(findPreference(PERSONAL_DATA_CATEGORY));
+        for (int i = screenPreferenceCount - 1; i >= 0; --i) {
+            Preference preference = screen.getPreference(i);
+            if (keysToRemove.contains(preference.getKey())) {
+                screen.removePreference(preference);
+            }
+        }
+        PreferenceCategory backupCategory = (PreferenceCategory) findPreference(BACKUP_CATEGORY);
+        if (backupCategory != null) {
+            final int backupCategoryPreferenceCount = backupCategory.getPreferenceCount();
+            for (int i = backupCategoryPreferenceCount - 1; i >= 0; --i) {
+                Preference preference = backupCategory.getPreference(i);
+                if (keysToRemove.contains(preference.getKey())) {
+                    backupCategory.removePreference(preference);
+                }
             }
-
-        // Vendor specific
-        if (getActivity().getPackageManager().
-                resolveContentProvider(GSETTINGS_PROVIDER, 0) == null) {
-            screen.removePreference(findPreference(BACKUP_CATEGORY));
         }
         updateToggles();
     }
@@ -285,6 +297,40 @@ public class PrivacySettings extends SettingsPreferenceFragment implements
 
             return result;
         }
+
+        @Override
+        public List<String> getNonIndexableKeys(Context context) {
+            return getNonVisibleKeys(context);
+        }
     }
 
+    private static ArrayList<String> getNonVisibleKeys(Context context) {
+        final ArrayList<String> nonVisibleKeys = new ArrayList<String>();
+        final IBackupManager backupManager = IBackupManager.Stub.asInterface(
+                ServiceManager.getService(Context.BACKUP_SERVICE));
+        boolean isServiceActive = false;
+        try {
+            isServiceActive = backupManager.isBackupServiceActive(UserHandle.myUserId());
+        } catch (RemoteException e) {
+            Log.w(TAG, "Failed querying backup manager service activity status. " +
+                    "Assuming it is inactive.");
+        }
+        if (isServiceActive) {
+            nonVisibleKeys.add(BACKUP_INACTIVE);
+        } else {
+            nonVisibleKeys.add(AUTO_RESTORE);
+            nonVisibleKeys.add(CONFIGURE_ACCOUNT);
+            nonVisibleKeys.add(BACKUP_DATA);
+        }
+        if (UserManager.get(context).hasUserRestriction(
+                UserManager.DISALLOW_FACTORY_RESET)) {
+            nonVisibleKeys.add(PERSONAL_DATA_CATEGORY);
+        }
+        // Vendor specific
+        if (context.getPackageManager().
+                resolveContentProvider(GSETTINGS_PROVIDER, 0) == null) {
+            nonVisibleKeys.add(BACKUP_CATEGORY);
+        }
+        return nonVisibleKeys;
+    }
 }