Add a screen to show OEM backup settings.

Moves the backup settings logic to BackupSettingsHelper and
BackupSettingsActivity:
- If the manufacturer provides the intent and the label for their backup
settings in the config.xml, a new intermediate fragment is shown for
Backup settings to let the user pick either standard backup settings or
OEM provided backup settings.
- If config.xml doesn't contain the intent, BackupSettingsActivity is
used as a trampoline activity to launch backup settings provided by the
backup transport of the default backup settings activity, i.e.
PrivacySettingsActivity.

Bug: 34700410
Bug: 33655074
Bug: 33654991
Test: make RunSettingsRoboTests
Change-Id: I78e340fbf926b2a9dc2c4e3942f9337c3c7a933c

src/com/android/settings/backup/BackupSettingsFragment.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package com.android.settings.backup;
+
+import android.content.Context;
+import android.os.Bundle;
+import android.provider.SearchIndexableResource;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceScreen;
+import android.util.Log;
+
+
+import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
+import com.android.settings.R;
+import com.android.settings.core.PreferenceController;
+import com.android.settings.dashboard.DashboardFragment;
+import com.android.settings.search.BaseSearchIndexProvider;
+import com.android.settings.search.Indexable;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * Fragment showing the items to launch different backup settings screens.
+ */
+public class BackupSettingsFragment extends DashboardFragment {
+    private static final String TAG = "BackupSettings";
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+    }
+
+    /**
+     * Get the tag string for logging.
+     */
+    @Override
+    protected String getLogTag() {
+        return TAG;
+    }
+
+    /**
+     * Get the res id for static preference xml for this fragment.
+     */
+    @Override
+    protected int getPreferenceScreenResId() {
+        return R.xml.backup_settings;
+    }
+
+    /**
+     * Get a list of {@link PreferenceController} for this fragment.
+     */
+    @Override
+    protected List<PreferenceController> getPreferenceControllers(Context context) {
+        final List<PreferenceController> controllers = new ArrayList<>();
+        controllers.add(new BackupSettingsPreferenceController(context));
+        return controllers;
+    }
+
+    public static final Indexable.SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
+            new BaseSearchIndexProvider() {
+                @Override
+                public List<SearchIndexableResource> getXmlResourcesToIndex(Context context,
+                        boolean enabled) {
+                    final SearchIndexableResource sir = new SearchIndexableResource(context);
+                    sir.xmlResId = R.xml.backup_settings;
+                    return Arrays.asList(sir);
+                }
+            };
+
+    @Override
+    public int getMetricsCategory() {
+        return MetricsEvent.BACKUP_SETTINGS;
+    }
+}