Merge "Fix 'No Apps' UI issues of ManageApplications" into sc-dev
diff --git a/res/layout/manage_applications_apps.xml b/res/layout/manage_applications_apps.xml
index d814164..7ea8803 100644
--- a/res/layout/manage_applications_apps.xml
+++ b/res/layout/manage_applications_apps.xml
@@ -14,7 +14,7 @@
      limitations under the License.
 -->
 
-<FrameLayout
+<androidx.constraintlayout.widget.ConstraintLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:settings="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
@@ -24,40 +24,38 @@
         android:id="@+id/pinned_header"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:elevation="2dp"/>
+        android:elevation="2dp"
+        settings:layout_constraintTop_toTopOf="parent"/>
 
-    <FrameLayout
-        android:id="@+id/list_container"
+    <androidx.recyclerview.widget.RecyclerView
+        android:id="@+id/apps_list"
         android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:visibility="gone">
+        android:layout_height="wrap_content"
+        android:clipToPadding="false"
+        android:scrollbars="none"
+        android:visibility="invisible"
+        settings:fastScrollEnabled="true"
+        settings:fastScrollHorizontalThumbDrawable="@drawable/thumb_drawable"
+        settings:fastScrollHorizontalTrackDrawable="@drawable/line_drawable"
+        settings:fastScrollVerticalThumbDrawable="@drawable/thumb_drawable"
+        settings:fastScrollVerticalTrackDrawable="@drawable/line_drawable"
+        settings:layout_constraintTop_toBottomOf="@id/pinned_header"/>
 
-        <androidx.recyclerview.widget.RecyclerView
-            android:id="@+id/apps_list"
-            android:layout_width="match_parent"
-            android:layout_height="match_parent"
-            android:clipToPadding="false"
-            android:scrollbars="none"
-            settings:fastScrollEnabled="true"
-            settings:fastScrollHorizontalThumbDrawable="@drawable/thumb_drawable"
-            settings:fastScrollHorizontalTrackDrawable="@drawable/line_drawable"
-            settings:fastScrollVerticalThumbDrawable="@drawable/thumb_drawable"
-            settings:fastScrollVerticalTrackDrawable="@drawable/line_drawable"/>
+    <TextView
+        android:id="@android:id/empty"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:gravity="center"
+        android:textAlignment="gravity"
+        android:text="@string/no_applications"
+        android:textAppearance="?android:attr/textAppearanceLarge"
+        android:visibility="invisible"
+        settings:layout_constraintTop_toBottomOf="@id/pinned_header"
+        settings:layout_constraintBottom_toBottomOf="parent"/>
 
-        <TextView
-            android:id="@android:id/empty"
-            android:layout_width="match_parent"
-            android:layout_height="match_parent"
-            android:gravity="bottom|center_horizontal"
-            android:layout_gravity="center"
-            android:text="@string/no_applications"
-            android:textAppearance="?android:attr/textAppearanceLarge"
-            android:visibility="invisible"/>
+    <include layout="@layout/loading_container"
+        settings:layout_constraintTop_toBottomOf="@id/pinned_header"
+        settings:layout_constraintBottom_toBottomOf="parent"/>
 
-    </FrameLayout>
-
-    <include layout="@layout/loading_container"/>
-
-</FrameLayout>
-
+</androidx.constraintlayout.widget.ConstraintLayout>
 
diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index fe0ada0..1b8179a 100755
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -149,8 +149,6 @@
     <dimen name="wifi_assistant_height">182dp</dimen>
     <dimen name="wifi_assistant_image_top">32dp</dimen>
     <dimen name="wifi_assistant_image_start">24dp</dimen>
-    <!-- appbar height is equal search bar height (48dp) plus search bar top and bottom margin  -->
-    <dimen name="app_bar_height">80dp</dimen>
 
     <!-- CryptKeeper top margin for password/pin screen -->
     <dimen name="crypt_keeper_password_top_margin">88dip</dimen>
diff --git a/src/com/android/settings/applications/RunningServices.java b/src/com/android/settings/applications/RunningServices.java
index 4d13241..b1689d5 100644
--- a/src/com/android/settings/applications/RunningServices.java
+++ b/src/com/android/settings/applications/RunningServices.java
@@ -72,7 +72,11 @@
     public void onResume() {
         super.onResume();
         boolean haveData = mRunningProcessesView.doResume(this, mRunningProcessesAvail);
-        mLoadingViewController.handleLoadingContainer(haveData /* done */, false /* animate */);
+        if (haveData) {
+            mLoadingViewController.showContent(false /* animate */);
+        } else {
+            mLoadingViewController.showLoadingView();
+        }
     }
 
     @Override
diff --git a/src/com/android/settings/applications/manageapplications/ManageApplications.java b/src/com/android/settings/applications/manageapplications/ManageApplications.java
index 6d67524..43e929b 100644
--- a/src/com/android/settings/applications/manageapplications/ManageApplications.java
+++ b/src/com/android/settings/applications/manageapplications/ManageApplications.java
@@ -208,7 +208,6 @@
     private ApplicationsAdapter mApplications;
 
     private View mLoadingContainer;
-    private View mListContainer;
     private SearchView mSearchView;
 
     // Size resource used for packages whose size computation failed for some reason
@@ -402,25 +401,21 @@
 
         mRootView = inflater.inflate(R.layout.manage_applications_apps, null);
         mLoadingContainer = mRootView.findViewById(R.id.loading_container);
-        mListContainer = mRootView.findViewById(R.id.list_container);
-        if (mListContainer != null) {
-            // Create adapter and list view here
-            mEmptyView = mListContainer.findViewById(android.R.id.empty);
+        mEmptyView = mRootView.findViewById(android.R.id.empty);
+        mRecyclerView = mRootView.findViewById(R.id.apps_list);
 
-            mApplications = new ApplicationsAdapter(mApplicationsState, this, mFilter,
-                    savedInstanceState);
-            if (savedInstanceState != null) {
-                mApplications.mHasReceivedLoadEntries =
-                        savedInstanceState.getBoolean(EXTRA_HAS_ENTRIES, false);
-                mApplications.mHasReceivedBridgeCallback =
-                        savedInstanceState.getBoolean(EXTRA_HAS_BRIDGE, false);
-            }
-            mRecyclerView = mListContainer.findViewById(R.id.apps_list);
-            mRecyclerView.setItemAnimator(null);
-            mRecyclerView.setLayoutManager(new LinearLayoutManager(
-                    getContext(), RecyclerView.VERTICAL, false /* reverseLayout */));
-            mRecyclerView.setAdapter(mApplications);
+        mApplications = new ApplicationsAdapter(mApplicationsState, this, mFilter,
+                savedInstanceState);
+        if (savedInstanceState != null) {
+            mApplications.mHasReceivedLoadEntries =
+                    savedInstanceState.getBoolean(EXTRA_HAS_ENTRIES, false);
+            mApplications.mHasReceivedBridgeCallback =
+                    savedInstanceState.getBoolean(EXTRA_HAS_BRIDGE, false);
         }
+        mRecyclerView.setItemAnimator(null);
+        mRecyclerView.setLayoutManager(new LinearLayoutManager(
+                getContext(), RecyclerView.VERTICAL, false /* reverseLayout */));
+        mRecyclerView.setAdapter(mApplications);
 
         // We have to do this now because PreferenceFrameLayout looks at it
         // only when the view is added.
@@ -985,16 +980,8 @@
             // overlapped by floating filter.
             if (hasFilter) {
                 mManageApplications.mSpinnerHeader.setVisibility(View.VISIBLE);
-                mManageApplications.mRecyclerView.setPadding(0 /* left */,
-                        mContext.getResources().getDimensionPixelSize(
-                                R.dimen.app_bar_height) /* top */,
-                        0 /* right */,
-                        0 /* bottom */);
             } else {
                 mManageApplications.mSpinnerHeader.setVisibility(View.GONE);
-                mManageApplications.mRecyclerView.setPadding(0 /* left */, 0 /* top */,
-                        0 /* right */,
-                        0 /* bottom */);
             }
         }
     }
@@ -1044,7 +1031,8 @@
             mManageApplications = manageApplications;
             mLoadingViewController = new LoadingViewController(
                     mManageApplications.mLoadingContainer,
-                    mManageApplications.mListContainer
+                    mManageApplications.mRecyclerView,
+                    mManageApplications.mEmptyView
             );
             mContext = manageApplications.getActivity();
             mIconDrawableFactory = IconDrawableFactory.newInstance(mContext);
@@ -1303,11 +1291,9 @@
             mOriginalEntries = entries;
             notifyDataSetChanged();
             if (getItemCount() == 0) {
-                mManageApplications.mRecyclerView.setVisibility(View.GONE);
-                mManageApplications.mEmptyView.setVisibility(View.VISIBLE);
+                mLoadingViewController.showEmpty(false /* animate */);
             } else {
-                mManageApplications.mEmptyView.setVisibility(View.GONE);
-                mManageApplications.mRecyclerView.setVisibility(View.VISIBLE);
+                mLoadingViewController.showContent(false /* animate */);
 
                 if (mManageApplications.mSearchView != null
                         && mManageApplications.mSearchView.isVisibleToUser()) {
@@ -1324,10 +1310,6 @@
                 mLastIndex = -1;
             }
 
-            if (mSession.getAllApps().size() != 0
-                    && mManageApplications.mListContainer.getVisibility() != View.VISIBLE) {
-                mLoadingViewController.showContent(true /* animate */);
-            }
             if (mManageApplications.mListType == LIST_TYPE_USAGE_ACCESS) {
                 // No enabled or disabled filters for usage access.
                 return;
diff --git a/src/com/android/settings/widget/LoadingViewController.java b/src/com/android/settings/widget/LoadingViewController.java
index 294e55e..66eebf3 100644
--- a/src/com/android/settings/widget/LoadingViewController.java
+++ b/src/com/android/settings/widget/LoadingViewController.java
@@ -22,34 +22,66 @@
 import android.view.animation.Animation;
 import android.view.animation.AnimationUtils;
 
+import androidx.annotation.Nullable;
+
 /**
- * A helper class that manages show/hide loading spinner.
+ * A helper class that manages show/hide loading spinner, content view and empty view (optional).
  */
 public class LoadingViewController {
 
     private static final long DELAY_SHOW_LOADING_CONTAINER_THRESHOLD_MS = 100L;
 
-    public final Handler mFgHandler;
-    public final View mLoadingView;
-    public final View mContentView;
+    private final Handler mFgHandler;
+    private final View mLoadingView;
+    private final View mContentView;
+    private final View mEmptyView;
 
     public LoadingViewController(View loadingView, View contentView) {
+        this(loadingView, contentView, null /* emptyView*/);
+    }
+
+    public LoadingViewController(View loadingView, View contentView, @Nullable View emptyView) {
         mLoadingView = loadingView;
         mContentView = contentView;
+        mEmptyView = emptyView;
         mFgHandler = new Handler(Looper.getMainLooper());
     }
 
     private Runnable mShowLoadingContainerRunnable = new Runnable() {
         public void run() {
-            handleLoadingContainer(false /* done */, false /* animate */);
+            showLoadingView();
         }
     };
 
+    /**
+     *  Shows content view and hides loading view & empty view.
+     */
     public void showContent(boolean animate) {
         // Cancel any pending task to show the loading animation and show the list of
         // apps directly.
         mFgHandler.removeCallbacks(mShowLoadingContainerRunnable);
-        handleLoadingContainer(true /* show */, animate);
+        handleLoadingContainer(true /* showContent */, false /* showEmpty*/, animate);
+    }
+
+    /**
+     *  Shows empty view and hides loading view & content view.
+     */
+    public void showEmpty(boolean animate) {
+        if (mEmptyView == null) {
+            return;
+        }
+
+        // Cancel any pending task to show the loading animation and show the list of
+        // apps directly.
+        mFgHandler.removeCallbacks(mShowLoadingContainerRunnable);
+        handleLoadingContainer(false /* showContent */, true /* showEmpty */, animate);
+    }
+
+    /**
+     *  Shows loading view and hides content view & empty view.
+     */
+    public void showLoadingView() {
+        handleLoadingContainer(false /* showContent */, false /* showEmpty */, false /* animate */);
     }
 
     public void showLoadingViewDelayed() {
@@ -57,8 +89,9 @@
                 mShowLoadingContainerRunnable, DELAY_SHOW_LOADING_CONTAINER_THRESHOLD_MS);
     }
 
-    public void handleLoadingContainer(boolean done, boolean animate) {
-        handleLoadingContainer(mLoadingView, mContentView, done, animate);
+    private void handleLoadingContainer(boolean showContent, boolean showEmpty, boolean animate) {
+        handleLoadingContainer(mLoadingView, mContentView, mEmptyView,
+                showContent, showEmpty, animate);
     }
 
     /**
@@ -75,6 +108,25 @@
         setViewShown(content, done, animate);
     }
 
+    /**
+     * Show/hide loading view and content view and empty view.
+     *
+     * @param loading The loading spinner view
+     * @param content The content view
+     * @param empty The empty view shows no item summary to users.
+     * @param showContent    If true, content is set visible and loading is set invisible.
+     * @param showEmpty    If true, empty is set visible and loading is set invisible.
+     * @param animate Whether or not content/loading views should animate in/out.
+     */
+    public static void handleLoadingContainer(View loading, View content, View empty,
+            boolean showContent, boolean showEmpty, boolean animate) {
+        if (empty != null) {
+            setViewShown(empty, showEmpty, animate);
+        }
+        setViewShown(content, showContent, animate);
+        setViewShown(loading, !showContent && !showEmpty, animate);
+    }
+
     private static void setViewShown(final View view, boolean shown, boolean animate) {
         if (animate) {
             Animation animation = AnimationUtils.loadAnimation(view.getContext(),
diff --git a/tests/robotests/src/com/android/settings/applications/manageapplications/ManageApplicationsTest.java b/tests/robotests/src/com/android/settings/applications/manageapplications/ManageApplicationsTest.java
index 86f5fe8..25eca7a 100644
--- a/tests/robotests/src/com/android/settings/applications/manageapplications/ManageApplicationsTest.java
+++ b/tests/robotests/src/com/android/settings/applications/manageapplications/ManageApplicationsTest.java
@@ -28,7 +28,6 @@
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyBoolean;
 import static org.mockito.ArgumentMatchers.anyInt;
-import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.doNothing;
 import static org.mockito.Mockito.doReturn;
 import static org.mockito.Mockito.mock;
@@ -49,7 +48,6 @@
 import android.view.MenuInflater;
 import android.view.MenuItem;
 import android.view.View;
-import android.view.ViewGroup;
 import android.widget.SearchView;
 
 import androidx.fragment.app.FragmentActivity;
@@ -156,22 +154,6 @@
     }
 
     @Test
-    public void onCreateView_shouldNotShowLoadingContainer() {
-        ReflectionHelpers.setField(mFragment, "mResetAppsHelper", mock(ResetAppsHelper.class));
-        doNothing().when(mFragment).createHeader();
-
-        final LayoutInflater layoutInflater = mock(LayoutInflater.class);
-        final View view = mock(View.class);
-        final View loadingContainer = mock(View.class);
-        when(layoutInflater.inflate(anyInt(), eq(null))).thenReturn(view);
-        when(view.findViewById(R.id.loading_container)).thenReturn(loadingContainer);
-
-        mFragment.onCreateView(layoutInflater, mock(ViewGroup.class), null);
-
-        verify(loadingContainer, never()).setVisibility(View.VISIBLE);
-    }
-
-    @Test
     public void onCreateOptionsMenu_shouldSetSearchQueryListener() {
         final SearchView searchView = mock(SearchView.class);
         final MenuItem searchMenu = mock(MenuItem.class);
@@ -221,7 +203,6 @@
     @Test
     public void updateLoading_appLoaded_shouldNotDelayCallToHandleLoadingContainer() {
         ReflectionHelpers.setField(mFragment, "mLoadingContainer", mock(View.class));
-        ReflectionHelpers.setField(mFragment, "mListContainer", mock(View.class));
         final ManageApplications.ApplicationsAdapter adapter =
                 spy(new ManageApplications.ApplicationsAdapter(mState, mFragment,
                         AppFilterRegistry.getInstance().get(FILTER_APPS_ALL), new Bundle()));
@@ -243,7 +224,6 @@
     @Test
     public void updateLoading_appNotLoaded_shouldDelayCallToHandleLoadingContainer() {
         ReflectionHelpers.setField(mFragment, "mLoadingContainer", mock(View.class));
-        ReflectionHelpers.setField(mFragment, "mListContainer", mock(View.class));
         final ManageApplications.ApplicationsAdapter adapter =
                 spy(new ManageApplications.ApplicationsAdapter(mState, mFragment,
                         AppFilterRegistry.getInstance().get(FILTER_APPS_ALL), new Bundle()));
@@ -272,7 +252,6 @@
         when(listContainer.getVisibility()).thenReturn(View.INVISIBLE);
         when(listContainer.getContext()).thenReturn(context);
         ReflectionHelpers.setField(mFragment, "mLoadingContainer", loadingContainer);
-        ReflectionHelpers.setField(mFragment, "mListContainer", listContainer);
         final ManageApplications.ApplicationsAdapter adapter =
                 spy(new ManageApplications.ApplicationsAdapter(mState, mFragment,
                         AppFilterRegistry.getInstance().get(FILTER_APPS_ALL), new Bundle()));
@@ -296,7 +275,7 @@
 
         adapter.onRebuildComplete(null);
 
-        verify(loadingViewController).showContent(true /* animate */);
+        verify(loadingViewController).showEmpty(false /* animate */);
     }
 
     @Test
@@ -304,15 +283,16 @@
         final String query = "Test";
         final RecyclerView recyclerView = mock(RecyclerView.class);
         final View emptyView = mock(View.class);
+        final View loadingContainer = mock(View.class);
         ReflectionHelpers.setField(mFragment, "mRecyclerView", recyclerView);
         ReflectionHelpers.setField(mFragment, "mEmptyView", emptyView);
+        ReflectionHelpers.setField(mFragment, "mLoadingContainer", loadingContainer);
         final SearchView searchView = mock(SearchView.class);
         ReflectionHelpers.setField(mFragment, "mSearchView", searchView);
         when(searchView.isVisibleToUser()).thenReturn(true);
         when(searchView.getQuery()).thenReturn(query);
         final View listContainer = mock(View.class);
         when(listContainer.getVisibility()).thenReturn(View.VISIBLE);
-        ReflectionHelpers.setField(mFragment, "mListContainer", listContainer);
         ReflectionHelpers.setField(
                 mFragment, "mFilterAdapter", mock(ManageApplications.FilterSpinnerAdapter.class));
         final ArrayList<ApplicationsState.AppEntry> appList = new ArrayList<>();
@@ -491,8 +471,6 @@
         mFragment.mFilterAdapter.updateFilterView(true);
 
         assertThat(mFragment.mSpinnerHeader.getVisibility()).isEqualTo(View.VISIBLE);
-        assertThat(mFragment.mRecyclerView.getPaddingTop()).isEqualTo(
-                mContext.getResources().getDimensionPixelSize(R.dimen.app_bar_height));
     }
 
     @Test