commit d73d6e56a9981128a6109891807423ead32b992e
author Steven Ng <stevenckng@google.com> Tue Mar 09 22:44:04 2021 +0000
committer Steven Ng <stevenckng@google.com> Wed Mar 10 17:36:37 2021 +0000
tree a871e7b03d15152ef48fad0add433faa7e583b94
parent 3c08f580c3583d6ed453fe15958d687acff317b6

Show an empty view when there is no widget available

Test: Remove all widgets from work profile using TestDpc. Observe
      empty view is shown in the full widget tray. Add back some
      widgets to work profile and observe widgets showing up in the
      full widgets tray

Bug: 179797520
Change-Id: I2e1fcb5a0014568a4674e2bcc0a3ed3c6ec5a44a

src/com/android/launcher3/widget/picker/WidgetsFullSheet.java

diff --git a/src/com/android/launcher3/widget/picker/WidgetsFullSheet.java b/src/com/android/launcher3/widget/picker/WidgetsFullSheet.java
index bf9b849..330175f 100644
--- a/src/com/android/launcher3/widget/picker/WidgetsFullSheet.java
+++ b/src/com/android/launcher3/widget/picker/WidgetsFullSheet.java
@@ -82,6 +82,7 @@
     @Nullable private PersonalWorkPagedView mViewPager;
     private int mInitialTabsHeight = 0;
     private View mTabsView;
+    private TextView mNoWidgetsView;
     private SearchAndRecommendationViewHolder mSearchAndRecommendationViewHolder;
     private SearchAndRecommendationsScrollController mSearchAndRecommendationsScrollController;
 
@@ -141,19 +142,32 @@
                 mViewPager);
         fastScroller.setOnFastScrollChangeListener(mSearchAndRecommendationsScrollController);
 
+        mNoWidgetsView = findViewById(R.id.no_widgets_text);
+
         onWidgetsBound();
     }
 
     @Override
     public void onActivePageChanged(int currentActivePage) {
-        WidgetsRecyclerView currentRecyclerView =
-                mAdapters.get(currentActivePage).mWidgetsRecyclerView;
+        AdapterHolder currentAdapterHolder = mAdapters.get(currentActivePage);
+        WidgetsRecyclerView currentRecyclerView = currentAdapterHolder.mWidgetsRecyclerView;
         currentRecyclerView.bindFastScrollbar();
         mSearchAndRecommendationsScrollController.setCurrentRecyclerView(currentRecyclerView);
 
+        updateNoWidgetsView(currentAdapterHolder);
+
         reset();
     }
 
+    private void updateNoWidgetsView(AdapterHolder adapterHolder) {
+        boolean isWidgetAvailable = adapterHolder.mWidgetsListAdapter.getItemCount() > 0;
+        adapterHolder.mWidgetsRecyclerView.setVisibility(isWidgetAvailable ? VISIBLE : GONE);
+
+        // Always resets the text in case this is updated by search.
+        mNoWidgetsView.setText(R.string.no_widgets_available);
+        mNoWidgetsView.setVisibility(isWidgetAvailable ? GONE : VISIBLE);
+    }
+
     private void reset() {
         mAdapters.get(AdapterHolder.PRIMARY).mWidgetsRecyclerView.scrollToTop();
         if (mHasWorkProfile) {
@@ -276,6 +290,8 @@
         AdapterHolder primaryUserAdapterHolder = mAdapters.get(AdapterHolder.PRIMARY);
         primaryUserAdapterHolder.setup(findViewById(R.id.primary_widgets_list_view));
         primaryUserAdapterHolder.mWidgetsListAdapter.setWidgets(allWidgets);
+        updateNoWidgetsView(primaryUserAdapterHolder);
+
         if (mHasWorkProfile) {
             AdapterHolder workUserAdapterHolder = mAdapters.get(AdapterHolder.WORK);
             workUserAdapterHolder.setup(findViewById(R.id.work_widgets_list_view));