Use searchable="false" to suppress nonIndexables.

When possible, remove or simplify getNonIndexable() logic in fragments,
and use searchable="false" in xml to suppress index.

Change-Id: I5bdf5bc7d5494a64cdd9e230a51321a4b210af69
Fixes: 112608186
Test: robotest and manual search

src/com/android/settings/connecteddevice/ConnectedDeviceDashboardFragment.java

@@ -19,6 +19,8 @@ import android.app.Activity;
 import android.content.Context;
 import android.provider.SearchIndexableResource;
 
+import androidx.annotation.VisibleForTesting;
+
 import com.android.internal.logging.nano.MetricsProto;
 import com.android.settings.R;
 import com.android.settings.dashboard.DashboardFragment;
@@ -32,8 +34,6 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 
-import androidx.annotation.VisibleForTesting;
-
 @SearchIndexable(forTarget = SearchIndexable.ALL & ~SearchIndexable.ARC)
 public class ConnectedDeviceDashboardFragment extends DashboardFragment {
 
@@ -139,14 +139,5 @@ public class ConnectedDeviceDashboardFragment extends DashboardFragment {
                         context) {
                     return buildPreferenceControllers(context, null /* lifecycle */);
                 }
-
-                @Override
-                public List<String> getNonIndexableKeys(Context context) {
-                    List<String> keys = super.getNonIndexableKeys(context);
-                    // Disable because they show dynamic data
-                    keys.add(KEY_AVAILABLE_DEVICES);
-                    keys.add(KEY_CONNECTED_DEVICES);
-                    return keys;
-                }
             };
 }