Do not show advanced dropdown if only one setting

Change-Id: I56eff1198636d0f0b95f4aa58eb90efc346c3f65
Fixes: 69402845
Test: make RunSettingsRoboTests -j40

src/com/android/settings/system/SystemDashboardFragment.java

@@ -16,8 +16,12 @@
 package com.android.settings.system;
 
 import android.content.Context;
+import android.os.Bundle;
 import android.os.UserManager;
 import android.provider.SearchIndexableResource;
+import android.support.v7.preference.Preference;
+import android.support.v7.preference.PreferenceGroup;
+import android.support.v7.preference.PreferenceScreen;
 
 import com.android.internal.logging.nano.MetricsProto;
 import com.android.settings.R;
@@ -40,6 +44,17 @@ public class SystemDashboardFragment extends DashboardFragment {
 
     private static final String KEY_RESET = "reset_dashboard";
 
+    @Override
+    public void onCreate(Bundle icicle) {
+        super.onCreate(icicle);
+
+        final PreferenceScreen screen = getPreferenceScreen();
+        // We do not want to display an advanced button if only one setting is hidden
+        if (getVisiblePreferenceCount(screen) == screen.getInitialExpandedChildrenCount() + 1) {
+            screen.setInitialExpandedChildrenCount(Integer.MAX_VALUE);
+        }
+    }
+
     @Override
     public int getMetricsCategory() {
         return MetricsProto.MetricsEvent.SETTINGS_SYSTEM_CATEGORY;
@@ -74,6 +89,19 @@ public class SystemDashboardFragment extends DashboardFragment {
         return controllers;
     }
 
+    private int getVisiblePreferenceCount(PreferenceGroup group) {
+        int visibleCount = 0;
+        for (int i = 0; i < group.getPreferenceCount(); i++) {
+            final Preference preference = group.getPreference(i);
+            if (preference instanceof PreferenceGroup) {
+                visibleCount += getVisiblePreferenceCount((PreferenceGroup) preference);
+            } else if (preference.isVisible()) {
+                visibleCount++;
+            }
+        }
+        return visibleCount;
+    }
+
     /**
      * For Search.
      */
@@ -88,7 +116,8 @@ public class SystemDashboardFragment extends DashboardFragment {
                 }
 
                 @Override
-                public List<AbstractPreferenceController> getPreferenceControllers(Context context) {
+                public List<AbstractPreferenceController> getPreferenceControllers(
+                        Context context) {
                     return buildPreferenceControllers(context);
                 }