Fix race condition and optimize categoryUpdater refresh

- In SettingsActivity, do not call updateCategories() if nothing
  changed.
- In SummaryLoader, create a mapping between tile key and summary. This
  is necessary to handle a race condition where category is refreshed
  after summary load.
- In DashboardSummary, refresh Tile's summary to latest cache value
  everytime category is refreshed.

Change-Id: I61389b8ba614ba7e34939325bada6e1bd6fa6709
Fix: 63149109
Test: robotests

tests/robotests/src/com/android/settings/dashboard/SummaryLoaderTest.java

@@ -17,13 +17,21 @@
 package com.android.settings.dashboard;
 
 import android.app.Activity;
-import com.android.settings.testutils.SettingsRobolectricTestRunner;
+import android.content.Context;
+import android.content.Intent;
+
 import com.android.settings.TestConfig;
+import com.android.settings.testutils.FakeFeatureFactory;
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
 import com.android.settingslib.drawer.DashboardCategory;
 import com.android.settingslib.drawer.Tile;
+
 import org.junit.Before;
 import org.junit.Test;
 import org.junit.runner.RunWith;
+import org.mockito.Answers;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
 import org.robolectric.Robolectric;
 import org.robolectric.annotation.Config;
 
@@ -31,18 +39,27 @@ import java.util.ArrayList;
 import java.util.List;
 
 import static com.google.common.truth.Truth.assertThat;
+import static org.mockito.Mockito.when;
 
 @RunWith(SettingsRobolectricTestRunner.class)
 @Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
 public class SummaryLoaderTest {
+
     private static final String SUMMARY_1 = "summary1";
     private static final String SUMMARY_2 = "summary2";
+
+    @Mock(answer = Answers.RETURNS_DEEP_STUBS)
+    private Context mContext;
     private SummaryLoader mSummaryLoader;
     private boolean mCallbackInvoked;
     private Tile mTile;
+    private FakeFeatureFactory mFeatureFactory;
 
     @Before
     public void SetUp() {
+        MockitoAnnotations.initMocks(this);
+        mFeatureFactory = FakeFeatureFactory.setupForTest(mContext);
+
         mTile = new Tile();
         mTile.summary = SUMMARY_1;
         mCallbackInvoked = false;
@@ -71,4 +88,23 @@ public class SummaryLoaderTest {
 
         assertThat(mCallbackInvoked).isTrue();
     }
+
+    @Test
+    public void testUpdateSummaryToCache_hasCache_shouldUpdate() {
+
+        final String testSummary = "test_summary";
+        final DashboardCategory category = new DashboardCategory();
+        final Tile tile = new Tile();
+        tile.key = "123";
+        tile.intent = new Intent();
+        category.addTile(tile);
+        when(mFeatureFactory.dashboardFeatureProvider.getDashboardKeyForTile(tile))
+                .thenReturn(tile.key);
+
+        mSummaryLoader.updateSummaryIfNeeded(tile, testSummary);
+        tile.summary = null;
+        mSummaryLoader.updateSummaryToCache(category);
+
+        assertThat(tile.summary).isEqualTo(testSummary);
+    }
 }