Add a few pages to search index.

- Data saver
- A few special permission access pages
   - Picture-in-picture
   - Premium sms
   - do not disturb access
- And a unrelated cleanup: move EmptyTextFragment from
  notification/ to widget/

Bug: 70720645
Test: robotests
Change-Id: I6a87f712bf81f9fd32fa9a3826fba851ca748409

src/com/android/settings/datausage/DataSaverSummary.java

@@ -15,7 +15,10 @@
 package com.android.settings.datausage;
 
 import android.app.Application;
+import android.content.Context;
 import android.os.Bundle;
+import android.provider.SearchIndexableResource;
+import android.telephony.SubscriptionManager;
 import android.widget.Switch;
 
 import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
@@ -24,17 +27,22 @@ import com.android.settings.SettingsActivity;
 import com.android.settings.SettingsPreferenceFragment;
 import com.android.settings.applications.AppStateBaseBridge.Callback;
 import com.android.settings.datausage.DataSaverBackend.Listener;
+import com.android.settings.search.BaseSearchIndexProvider;
+import com.android.settings.search.Indexable;
 import com.android.settings.widget.SwitchBar;
 import com.android.settings.widget.SwitchBar.OnSwitchChangeListener;
 import com.android.settingslib.applications.ApplicationsState;
 import com.android.settingslib.applications.ApplicationsState.AppEntry;
 import com.android.settingslib.applications.ApplicationsState.Callbacks;
 import com.android.settingslib.applications.ApplicationsState.Session;
+import com.android.settingslib.search.SearchIndexable;
 
 import java.util.ArrayList;
+import java.util.List;
 
 import androidx.preference.Preference;
 
+@SearchIndexable
 public class DataSaverSummary extends SettingsPreferenceFragment
         implements OnSwitchChangeListener, Listener, Callback, Callbacks {
 
@@ -94,7 +102,7 @@ public class DataSaverSummary extends SettingsPreferenceFragment
 
     @Override
     public void onSwitchChanged(Switch switchView, boolean isChecked) {
-        synchronized(this) {
+        synchronized (this) {
             if (mSwitching) {
                 return;
             }
@@ -115,7 +123,7 @@ public class DataSaverSummary extends SettingsPreferenceFragment
 
     @Override
     public void onDataSaverChanged(boolean isDataSaving) {
-        synchronized(this) {
+        synchronized (this) {
             mSwitchBar.setChecked(isDataSaving);
             mSwitching = false;
         }
@@ -190,4 +198,25 @@ public class DataSaverSummary extends SettingsPreferenceFragment
     public void onLoadEntriesCompleted() {
 
     }
+
+    public static final Indexable.SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
+            new BaseSearchIndexProvider() {
+                @Override
+                public List<SearchIndexableResource> getXmlResourcesToIndex(Context context,
+                        boolean enabled) {
+                    final ArrayList<SearchIndexableResource> result = new ArrayList<>();
+
+                    final SearchIndexableResource sir = new SearchIndexableResource(context);
+                    sir.xmlResId = R.xml.data_saver;
+                    result.add(sir);
+                    return result;
+                }
+
+                @Override
+                protected boolean isPageSearchEnabled(Context context) {
+                    return DataUsageUtils.hasMobileData(context)
+                            && DataUsageUtils.getDefaultSubscriptionId(context)
+                            != SubscriptionManager.INVALID_SUBSCRIPTION_ID;
+                }
+            };
 }