[List UI Unification] Basic list unification for phones

chrome/android/java/src/org/chromium/chrome/browser/download/ui/DownloadManagerUi.java

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.download.ui;
 
 import android.app.Activity;
 import android.content.ComponentName;
 import android.content.Intent;
 import android.content.res.Resources;
 import android.os.AsyncTask;
 import android.support.graphics.drawable.VectorDrawableCompat;
 import android.support.v4.view.GravityCompat;
 import android.support.v4.widget.DrawerLayout;
 import android.support.v4.widget.DrawerLayout.DrawerListener;
 import android.support.v7.widget.RecyclerView;
-import android.support.v7.widget.RecyclerView.ItemAnimator;
 import android.support.v7.widget.Toolbar.OnMenuItemClickListener;
 import android.view.Gravity;
 import android.view.LayoutInflater;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ListView;
 
 import org.chromium.base.ContextUtils;
 import org.chromium.base.FileUtils;
@@ skipping 139 matching lines @@
 
     private final DownloadHistoryAdapter mHistoryAdapter;
     private final FilterAdapter mFilterAdapter;
     private final ObserverList<DownloadUiObserver> mObservers = new ObserverList<>();
     private final BackendProvider mBackendProvider;
 
     private final SpaceDisplay mSpaceDisplay;
     private final ListView mFilterView;
     private final UndoDeletionSnackbarController mUndoDeletionSnackbarController;
     private final RecyclerView mRecyclerView;
-    private final ItemAnimator mItemAnimator;
 
     private BasicNativePage mNativePage;
     private Activity mActivity;
     private ViewGroup mMainView;
     private DownloadManagerToolbar mToolbar;
     private SelectableListLayout<DownloadHistoryItemWrapper> mSelectableListLayout;
 
     @SuppressWarnings("unchecked")  // mSelectableListLayout
     public DownloadManagerUi(
             Activity activity, boolean isOffTheRecord, ComponentName parentComponent) {
         mActivity = activity;
         mBackendProvider =
                 sProviderForTests == null ? new DownloadBackendProvider() : sProviderForTests;
 
         mMainView = (ViewGroup) LayoutInflater.from(activity).inflate(R.layout.download_main, null);
 
         DrawerLayout drawerLayout = null;
         if (!DeviceFormFactor.isLargeTablet(activity)) {
             drawerLayout = (DrawerLayout) mMainView;
             addDrawerListener(drawerLayout);
         }
 
         mSelectableListLayout = (SelectableListLayout<DownloadHistoryItemWrapper>)
                 mMainView.findViewById(R.id.selectable_list);
 
         mSelectableListLayout.initializeEmptyView(
-                VectorDrawableCompat.create(mActivity.getResources(),
-                        R.drawable.downloads_big, mActivity.getTheme()),
-                R.string.download_manager_ui_empty);
+                VectorDrawableCompat.create(
+                        mActivity.getResources(), R.drawable.downloads_big, mActivity.getTheme()),
+                R.string.download_manager_ui_empty, R.string.download_manager_no_results);
 
         mHistoryAdapter = new DownloadHistoryAdapter(isOffTheRecord, parentComponent);
         mRecyclerView = mSelectableListLayout.initializeRecyclerView(mHistoryAdapter);
-        mItemAnimator = mRecyclerView.getItemAnimator();
 
         // Prevent every progress update from causing a transition animation.
-        mItemAnimator.setChangeDuration(0);
+        mRecyclerView.getItemAnimator().setChangeDuration(0);
 
         mHistoryAdapter.initialize(mBackendProvider);
         addObserver(mHistoryAdapter);
 
         mSpaceDisplay = new SpaceDisplay(mMainView, mHistoryAdapter);
         mHistoryAdapter.registerAdapterDataObserver(mSpaceDisplay);
         mSpaceDisplay.onChanged();
 
         mFilterAdapter = new FilterAdapter();
         mFilterAdapter.initialize(this);
@@ skipping 79 matching lines @@
         if (item.getItemId() == R.id.close_menu_id && !DeviceFormFactor.isTablet(mActivity)) {
             mActivity.finish();
             return true;
         } else if (item.getItemId() == R.id.selection_mode_delete_menu_id) {
             deleteSelectedItems();
             return true;
         } else if (item.getItemId() == R.id.selection_mode_share_menu_id) {
             shareSelectedItems();
             return true;
         } else if (item.getItemId() == R.id.search_menu_id) {
-            mRecyclerView.setItemAnimator(null);
+            mSelectableListLayout.onStartSearch();
             mToolbar.showSearchView();
-            mSelectableListLayout.setEmptyViewText(R.string.download_manager_no_results);
             RecordUserAction.record("Android.DownloadManager.Search");
             return true;
         }
         return false;
     }
 
     /**
      * @see DrawerLayout#openDrawer(int)
      */
     @VisibleForTesting
@@ skipping 58 matching lines @@
                 DownloadFilter.FILTER_BOUNDARY);
     }
 
     @Override
     public void onSearchTextChanged(String query) {
         mHistoryAdapter.search(query);
     }
 
     @Override
     public void onEndSearch() {
-        mSelectableListLayout.setEmptyViewText(R.string.download_manager_ui_empty);
+        mSelectableListLayout.onEndSearch();
         mHistoryAdapter.onEndSearch();
-        mRecyclerView.setItemAnimator(mItemAnimator);
     }
 
     private void shareSelectedItems() {
         List<DownloadHistoryItemWrapper> selectedItems =
                 mBackendProvider.getSelectionDelegate().getSelectedItems();
         assert selectedItems.size() > 0;
 
         mActivity.startActivity(Intent.createChooser(createShareIntent(),
                 mActivity.getString(R.string.share_link_chooser_title)));
 
@@ skipping 107 matching lines @@
     public SpaceDisplay getSpaceDisplayForTests() {
         return mSpaceDisplay;
     }
 
     /** Sets a BackendProvider that is used in place of a real one. */
     @VisibleForTesting
     public static void setProviderForTests(BackendProvider provider) {
         sProviderForTests = provider;
     }
 }