Fork Search code to independantly develop and test search.

This is the start of the new search in Settings. It is a nearly complete
replacement of the old search code in a more modular and flexible
architecture. It is expanding the datasources that it queries, including
the same Settings database, which will now include more first party apps
and be extended to support inline results where the user can change
settings directly from the search view. Search will also fan out to
query new sources (local or remote), and is built in a way
such that adding additional sources is roughly the same amount of work
had they been added in the initial writing of this code.

Query interpretation will now be source-dependant, allowing for future
upgrades to fuzzy search where it is applicable.

Change-Id: Ib0bac1fe92bf8a662d33abf9a99bb6ee2090ec8f
Fixes: 32115225, 32378927
Test: make RunSettingsRoboTests

src/com/android/settings/search2/SearchFragment.java

@@ -0,0 +1,158 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.search2;
+
+import android.app.Activity;
+import android.content.Loader;
+import android.os.Bundle;
+import android.app.LoaderManager;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
+import android.view.LayoutInflater;
+import android.view.MenuItem;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.widget.SearchView;
+
+import com.android.internal.logging.nano.MetricsProto;
+import com.android.settings.R;
+import com.android.settings.core.InstrumentedFragment;
+
+import java.util.List;
+
+public class SearchFragment extends InstrumentedFragment implements
+        SearchView.OnQueryTextListener, MenuItem.OnActionExpandListener,
+        LoaderManager.LoaderCallbacks<List<SearchResult>>  {
+
+    private static final int DATABASE_LOADER_ID = 0;
+
+    private SearchResultsAdapter mSearchAdapter;
+
+    private DatabaseResultLoader mSearchLoader;
+
+    private RecyclerView mResultsRecyclerView;
+    private SearchView mSearchView;
+    private MenuItem mSearchMenuItem;
+
+    private String mQuery;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setHasOptionsMenu(true);
+
+        mSearchAdapter = new SearchResultsAdapter();
+
+        final LoaderManager loaderManager = getLoaderManager();
+        loaderManager.initLoader(DATABASE_LOADER_ID, null, this);
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+        final View view = inflater.inflate(R.layout.search_panel_2, container, false);
+        mResultsRecyclerView = (RecyclerView) view.findViewById(R.id.list_results);
+
+        mResultsRecyclerView.setAdapter(mSearchAdapter);
+        mResultsRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
+        return view;
+    }
+
+    @Override
+    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+        super.onCreateOptionsMenu(menu, inflater);
+        inflater.inflate(R.menu.search_options_menu, menu);
+
+
+        mSearchMenuItem = menu.findItem(R.id.search);
+
+        mSearchView = (SearchView) mSearchMenuItem.getActionView();
+        mSearchView.setOnQueryTextListener(this);
+        mSearchView.setMaxWidth(Integer.MAX_VALUE);
+        mSearchMenuItem.expandActionView();
+    }
+
+    @Override
+    public boolean onMenuItemActionExpand(MenuItem item) {
+        return true;
+    }
+
+    @Override
+    public boolean onMenuItemActionCollapse(MenuItem item) {
+        // Return false to prevent the search box from collapsing.
+        return false;
+    }
+
+    @Override
+    public boolean onQueryTextChange(String query) {
+        if (query == null || query.equals(mQuery)) {
+            return false;
+        }
+
+        mQuery = query;
+        clearLoaders();
+
+        final LoaderManager loaderManager = getLoaderManager();
+        loaderManager.restartLoader(DATABASE_LOADER_ID, null, this);
+
+        return true;
+    }
+
+    @Override
+    public boolean onQueryTextSubmit(String query) {
+        return false;
+    }
+
+    @Override
+    public Loader<List<SearchResult>> onCreateLoader(int id, Bundle args) {
+        final Activity activity = getActivity();
+
+        switch (id) {
+            case DATABASE_LOADER_ID:
+                mSearchLoader = new DatabaseResultLoader(activity, mQuery);
+                return mSearchLoader;
+            default:
+                return null;
+        }
+    }
+
+    @Override
+    public void onLoadFinished(Loader<List<SearchResult>> loader, List<SearchResult> data) {
+        if (data == null) {
+            return;
+        }
+
+        mSearchAdapter.mergeResults(data, loader.getClass().getName());
+    }
+
+    @Override
+    public void onLoaderReset(Loader<List<SearchResult>> loader) { }
+
+    @Override
+    public int getMetricsCategory() {
+        return MetricsProto.MetricsEvent.DASHBOARD_SEARCH_RESULTS;
+    }
+
+    private void clearLoaders() {
+        if (mSearchLoader != null) {
+            mSearchLoader.cancelLoad();
+            mSearchLoader = null;
+        }
+    }
+}