Summary support for Settings Home

Also add summaries to a few of the major items.

Change-Id: I17924f14941fe095d819e142cdd21cf4b4e9ffd1

src/com/android/settings/DisplaySettings.java

@@ -38,9 +38,9 @@ import android.support.v7.preference.Preference;
 import android.support.v7.preference.Preference.OnPreferenceChangeListener;
 import android.text.TextUtils;
 import android.util.Log;
-
 import com.android.internal.logging.MetricsLogger;
 import com.android.internal.view.RotationPolicy;
+import com.android.settings.dashboard.SummaryLoader;
 import com.android.settings.search.BaseSearchIndexProvider;
 import com.android.settings.search.Indexable;
 
@@ -481,6 +481,40 @@ public class DisplaySettings extends SettingsPreferenceFragment implements
         return R.string.help_uri_display;
     }
 
+    private static class SummaryProvider implements SummaryLoader.SummaryProvider {
+        private final Context mContext;
+        private final SummaryLoader mLoader;
+
+        private SummaryProvider(Context context, SummaryLoader loader) {
+            mContext = context;
+            mLoader = loader;
+        }
+
+        @Override
+        public void setListening(boolean listening) {
+            if (listening) {
+                updateSummary();
+            }
+        }
+
+        private void updateSummary() {
+            boolean auto = Settings.System.getInt(mContext.getContentResolver(),
+                    SCREEN_BRIGHTNESS_MODE, SCREEN_BRIGHTNESS_MODE_AUTOMATIC)
+                    == SCREEN_BRIGHTNESS_MODE_AUTOMATIC;
+            mLoader.setSummary(this, mContext.getString(auto ? R.string.display_summary_on
+                    : R.string.display_summary_off));
+        }
+    }
+
+    public static final SummaryLoader.SummaryProviderFactory SUMMARY_PROVIDER_FACTORY
+            = new SummaryLoader.SummaryProviderFactory() {
+        @Override
+        public SummaryLoader.SummaryProvider createSummaryProvider(Activity activity,
+                                                                   SummaryLoader summaryLoader) {
+            return new SummaryProvider(activity, summaryLoader);
+        }
+    };
+
     public static final Indexable.SearchIndexProvider SEARCH_INDEX_DATA_PROVIDER =
             new BaseSearchIndexProvider() {
                 @Override