Merge "Fix jank in showing conditions and suggestions in cold start." into oc-mr1-dev am: 51c83353fe

am: e80bb0d5ce

Change-Id: Id3de7150516804bc7a08c665943769c27173fc9a

src/com/android/settings/dashboard/DashboardSummary.java

@@ -75,6 +75,7 @@ public class DashboardSummary extends InstrumentedFragment
     private DashboardFeatureProvider mDashboardFeatureProvider;
     private SuggestionFeatureProvider mSuggestionFeatureProvider;
     private boolean isOnCategoriesChangedCalled;
+    private boolean mOnConditionsChangedCalled;
 
     @Override
     public int getMetricsCategory() {
@@ -237,11 +238,22 @@ public class DashboardSummary extends InstrumentedFragment
     @Override
     public void onConditionsChanged() {
         Log.d(TAG, "onConditionsChanged");
-        final boolean scrollToTop = mLayoutManager.findFirstCompletelyVisibleItemPosition() <= 1;
+        // Bypass refreshing the conditions on the first call of onConditionsChanged.
+        // onConditionsChanged is called immediately everytime we start listening to the conditions
+        // change when we gain window focus. Since the conditions are passed to the adapter's
+        // constructor when we create the view, the first handling is not necessary.
+        // But, on the subsequent calls we need to handle it because there might be real changes to
+        // conditions.
+        if (mOnConditionsChangedCalled) {
+            final boolean scrollToTop =
+                    mLayoutManager.findFirstCompletelyVisibleItemPosition() <= 1;
             mAdapter.setConditions(mConditionManager.getConditions());
             if (scrollToTop) {
                 mDashboard.scrollToPosition(0);
             }
+        } else {
+            mOnConditionsChangedCalled = true;
+        }
     }
 
     @Override

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

@@ -36,6 +36,7 @@ import org.robolectric.annotation.Config;
 import org.robolectric.util.ReflectionHelpers;
 
 import static org.mockito.ArgumentMatchers.nullable;
+import static org.mockito.Mockito.any;
 import static org.mockito.Mockito.doNothing;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.mock;
@@ -90,6 +91,7 @@ public class DashboardSummaryTest {
     public void onConditionChanged_PositionAtTop_ScrollToTop() {
         when(mLayoutManager.findFirstCompletelyVisibleItemPosition()).thenReturn(1);
         mSummary.onConditionsChanged();
+        mSummary.onConditionsChanged();
         verify(mDashboard).scrollToPosition(0);
     }
 
@@ -97,9 +99,23 @@ public class DashboardSummaryTest {
     public void onConditionChanged_PositionNotTop_RemainPosition() {
         when(mLayoutManager.findFirstCompletelyVisibleItemPosition()).thenReturn(2);
         mSummary.onConditionsChanged();
+        mSummary.onConditionsChanged();
         verify(mDashboard, never()).scrollToPosition(0);
     }
 
+    @Test
+    public void onConditionChanged_firstCall_shouldIgnore() {
+        mSummary.onConditionsChanged();
+        verify(mAdapter, never()).setConditions(any());
+    }
+
+    @Test
+    public void onConditionChanged_secondCall_shouldSetConditionsOnAdapter() {
+        mSummary.onConditionsChanged();
+        mSummary.onConditionsChanged();
+        verify(mAdapter).setConditions(any());
+    }
+
     @Test
     public void onCategoryChanged_noRebuildOnFirstCall() {
         doReturn(mock(Activity.class)).when(mSummary).getActivity();