Update mSortOrder when changed to frequent

Update mSortOrder so when the activity is resumed, the
apps are sorted how the user wants

Test: make ROBOTEST_FILTER=ManageApplicationsTest RunSettingsRoboTests
Change-Id: I422846aada29ee254996b2e94da27af7ed935a0b
Fixes: 77691626

src/com/android/settings/applications/manageapplications/ManageApplications.java

@@ -176,7 +176,8 @@ public class ManageApplications extends InstrumentedFragment
     private static final int NO_USER_SPECIFIED = -1;
 
     // sort order
-    private int mSortOrder = R.id.sort_order_alpha;
+    @VisibleForTesting
+    int mSortOrder = R.id.sort_order_alpha;
 
     // whether showing system apps.
     private boolean mShowSystem;
@@ -649,9 +650,8 @@ public class ManageApplications extends InstrumentedFragment
         switch (item.getItemId()) {
             case R.id.sort_order_alpha:
             case R.id.sort_order_size:
-                mSortOrder = menuId;
                 if (mApplications != null) {
-                    mApplications.rebuild(mSortOrder);
+                    mApplications.rebuild(menuId);
                 }
                 break;
             case R.id.show_system:
@@ -712,6 +712,7 @@ public class ManageApplications extends InstrumentedFragment
     public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
         mFilter = mFilterAdapter.getFilter(position);
         mApplications.setFilter(mFilter);
+
         if (DEBUG) Log.d(TAG, "Selecting filter " + mFilter);
     }
 
@@ -986,6 +987,7 @@ public class ManageApplications extends InstrumentedFragment
             if (sort == mLastSortMode) {
                 return;
             }
+            mManageApplications.mSortOrder = sort;
             mLastSortMode = sort;
             rebuild();
         }

tests/robotests/src/com/android/settings/applications/manageapplications/ManageApplicationsTest.java

@@ -23,6 +23,8 @@ import static com.android.settings.applications.manageapplications.ManageApplica
 import static com.android.settings.applications.manageapplications.ManageApplications.LIST_TYPE_NOTIFICATION;
 import static com.google.common.truth.Truth.assertThat;
 
+import static junit.framework.Assert.assertEquals;
+
 import static org.mockito.ArgumentMatchers.anyBoolean;
 import static org.mockito.Matchers.any;
 import static org.mockito.Matchers.anyInt;
@@ -303,6 +305,23 @@ public class ManageApplicationsTest {
         verify(holder, never()).updateSwitch(any(), anyBoolean(), anyBoolean());
     }
 
+    @Test
+    public void sortOrderSavedOnRebuild() {
+        ManageApplications manageApplications = mock(ManageApplications.class);
+        manageApplications.mListType = LIST_TYPE_NOTIFICATION;
+        manageApplications.mSortOrder = -1;
+        ManageApplications.ApplicationsAdapter adapter =
+                new ManageApplications.ApplicationsAdapter(mState,
+                        manageApplications, mock(AppFilterItem.class),
+                        mock(Bundle.class));
+
+        adapter.rebuild(mSortRecent.getItemId());
+        assertThat(manageApplications.mSortOrder).isEqualTo(mSortRecent.getItemId());
+
+        adapter.rebuild(mSortFrequent.getItemId());
+        assertThat(manageApplications.mSortOrder).isEqualTo(mSortFrequent.getItemId());
+    }
+
     private void setUpOptionMenus() {
         when(mMenu.findItem(anyInt())).thenAnswer(invocation -> {
             final Object[] args = invocation.getArguments();