Update updateEmptyView

Also consider the visiblity of list container, when list container
is invisible, we should show the empty view.

Bug: 62062415
Test: RunSettingsRoboTests
Change-Id: I065e70386242c425ef3cbfb2b703a5433dbe40c1

src/com/android/settings/SettingsPreferenceFragment.java

@@ -312,12 +312,15 @@ public abstract class SettingsPreferenceFragment extends InstrumentedPreferenceF
         }
     }
 
-    private void updateEmptyView() {
+    @VisibleForTesting
+    void updateEmptyView() {
         if (mEmptyView == null) return;
         if (getPreferenceScreen() != null) {
+            final View listContainer = getActivity().findViewById(android.R.id.list_container);
             boolean show = (getPreferenceScreen().getPreferenceCount()
                     - (mHeader != null ? 1 : 0)
-                    - (mFooterPreferenceMixin.hasFooter() ? 1 : 0)) <= 0;
+                    - (mFooterPreferenceMixin.hasFooter() ? 1 : 0)) <= 0
+                    || (listContainer != null && listContainer.getVisibility() != View.VISIBLE);
             mEmptyView.setVisibility(show ? View.VISIBLE : View.GONE);
         } else {
             mEmptyView.setVisibility(View.VISIBLE);

tests/robotests/src/com/android/settings/SettingsPreferenceFragmentTest.java

@@ -17,11 +17,13 @@
 package com.android.settings;
 
 
+import android.app.Activity;
 import android.content.Context;
 import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceCategory;
 import android.support.v7.preference.PreferenceManager;
 import android.support.v7.preference.PreferenceScreen;
+import android.view.View;
 
 import org.junit.Before;
 import org.junit.Test;
@@ -30,8 +32,11 @@ import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 import org.robolectric.RuntimeEnvironment;
 import org.robolectric.annotation.Config;
+import org.robolectric.util.ReflectionHelpers;
 
 import static com.google.common.truth.Truth.assertThat;
+
+import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.spy;
 import static org.mockito.Mockito.when;
@@ -40,16 +45,31 @@ import static org.mockito.Mockito.when;
 @Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
 public class SettingsPreferenceFragmentTest {
 
+    private static final int ITEM_COUNT = 5;
+
     @Mock
     private PreferenceManager mPreferenceManager;
+    @Mock
+    private Activity mActivity;
+    @Mock
+    private View mListContainer;
+    @Mock
+    private PreferenceScreen mPreferenceScreen;
     private Context mContext;
     private TestFragment mFragment;
+    private View mEmptyView;
 
     @Before
     public void setUp() {
         MockitoAnnotations.initMocks(this);
         mContext = RuntimeEnvironment.application;
-        mFragment = new TestFragment();
+        mFragment = spy(new TestFragment());
+        doReturn(mActivity).when(mFragment).getActivity();
+
+        mEmptyView = new View(mContext);
+        ReflectionHelpers.setField(mFragment, "mEmptyView", mEmptyView);
+
+        doReturn(ITEM_COUNT).when(mPreferenceScreen).getPreferenceCount();
     }
 
     @Test
@@ -100,7 +120,27 @@ public class SettingsPreferenceFragmentTest {
         assertThat(mScreen.getPreferenceCount()).isEqualTo(1);
     }
 
-    public static final class TestFragment extends SettingsPreferenceFragment {
+    @Test
+    public void testUpdateEmptyView_containerInvisible_emptyViewVisible() {
+        doReturn(View.INVISIBLE).when(mListContainer).getVisibility();
+        doReturn(mListContainer).when(mActivity).findViewById(android.R.id.list_container);
+        doReturn(mPreferenceScreen).when(mFragment).getPreferenceScreen();
+
+        mFragment.updateEmptyView();
+
+        assertThat(mEmptyView.getVisibility()).isEqualTo(View.VISIBLE);
+    }
+
+    @Test
+    public void testUpdateEmptyView_containerNull_emptyViewGone() {
+        doReturn(mPreferenceScreen).when(mFragment).getPreferenceScreen();
+
+        mFragment.updateEmptyView();
+
+        assertThat(mEmptyView.getVisibility()).isEqualTo(View.GONE);
+    }
+
+    public static class TestFragment extends SettingsPreferenceFragment {
 
         @Override
         public int getMetricsCategory() {