Added search suggestions

FAQ.md

@@ -44,7 +44,7 @@ For authorizing:
 * ~~[ManageSieve](https://tools.ietf.org/html/rfc5804)~~ (there are no maintained Java libraries with a suitable license and without dependencies and besides that, FairEmail has its own filter rules)
 * ~~Search for messages with/without attachments~~ (this cannot be added because IMAP doesn't support searching for attachments)
 * ~~Search for a folder~~ (filtering a hierarchical folder list is problematic)
-* Seach history
+* ~~Search suggestions~~
 
 Anything on this list is in random order and *might* be added in the near future.
 

app/src/main/java/eu/faircode/email/DaoMessage.java

@@ -19,6 +19,8 @@ package eu.faircode.email;
     Copyright 2018-2019 by Marcel Bokhorst (M66B)
 */
 
+import android.database.Cursor;
+
 import androidx.lifecycle.LiveData;
 import androidx.paging.DataSource;
 import androidx.room.Dao;
@@ -305,10 +307,15 @@ public interface DaoMessage {
     @Query("SELECT * FROM message WHERE NOT ui_snoozed IS NULL")
     List<EntityMessage> getSnoozed();
 
-    @Query("SELECT id, `from`, avatar FROM message" +
+    @Query("SELECT id AS _id, subject AS suggestion FROM message" +
-            " WHERE folder = :folder" +
+            " WHERE subject LIKE :query" +
-            " AND received >= :before")
+            " GROUP BY subject" +
-    List<TupleMessageLookup> getAvatars(long folder, long before);
+            " UNION" +
+            " SELECT id AS _id, sender AS suggestion FROM message" +
+            " WHERE sender LIKE :query" +
+            " GROUP BY sender" +
+            " ORDER BY sender, subject")
+    Cursor getSuggestions(String query);
 
     @Insert
     long insertMessage(EntityMessage message);

app/src/main/java/eu/faircode/email/FragmentMessages.java

@@ -30,6 +30,7 @@ import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.IntentSender;
 import android.content.SharedPreferences;
+import android.database.Cursor;
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.PorterDuff;
@@ -80,6 +81,7 @@ import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.widget.PopupMenu;
 import androidx.appcompat.widget.SearchView;
 import androidx.constraintlayout.widget.Group;
+import androidx.cursoradapter.widget.SimpleCursorAdapter;
 import androidx.documentfile.provider.DocumentFile;
 import androidx.fragment.app.FragmentActivity;
 import androidx.fragment.app.FragmentManager;
@@ -2242,7 +2244,7 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
         inflater.inflate(R.menu.menu_messages, menu);
 
         final MenuItem menuSearch = menu.findItem(R.id.menu_search);
-        SearchView searchView = (SearchView) menuSearch.getActionView();
+        final SearchView searchView = (SearchView) menuSearch.getActionView();
         searchView.setQueryHint(getString(R.string.title_search));
 
         if (!TextUtils.isEmpty(searching)) {
@@ -2254,6 +2256,39 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
             @Override
             public boolean onQueryTextChange(String newText) {
                 searching = newText;
+
+                Bundle args = new Bundle();
+                args.putString("query", newText);
+
+                new SimpleTask<Cursor>() {
+                    @Override
+                    protected Cursor onExecute(Context context, Bundle args) {
+                        String query = args.getString("query");
+
+                        DB db = DB.getInstance(context);
+                        return db.message().getSuggestions("%" + query + "%");
+                    }
+
+                    @Override
+                    protected void onExecuted(Bundle args, Cursor cursor) {
+                        Log.i("Suggestions=" + cursor.getCount());
+                        SimpleCursorAdapter adapter = new SimpleCursorAdapter(
+                                getContext(),
+                                android.R.layout.simple_list_item_1,
+                                cursor,
+                                new String[]{"suggestion"},
+                                new int[]{android.R.id.text1},
+                                0);
+                        searchView.setSuggestionsAdapter(adapter);
+                        adapter.notifyDataSetChanged();
+                    }
+
+                    @Override
+                    protected void onException(Bundle args, Throwable ex) {
+                        Helper.unexpectedError(getFragmentManager(), ex);
+                    }
+                }.execute(FragmentMessages.this, args, "messages:suggestions");
+
                 return true;
             }
 
@@ -2268,6 +2303,20 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
             }
         });
 
+        searchView.setOnSuggestionListener(new SearchView.OnSuggestionListener() {
+            @Override
+            public boolean onSuggestionSelect(int position) {
+                return false;
+            }
+
+            @Override
+            public boolean onSuggestionClick(int position) {
+                Cursor cursor = (Cursor) searchView.getSuggestionsAdapter().getItem(position);
+                searchView.setQuery(cursor.getString(1), true);
+                return false;
+            }
+        });
+
         menu.findItem(R.id.menu_folders).setActionView(R.layout.action_button);
         ImageButton ib = (ImageButton) menu.findItem(R.id.menu_folders).getActionView();
         ib.setOnClickListener(new View.OnClickListener() {

app/src/main/java/eu/faircode/email/TupleMessageLookup.java

@@ -1,28 +0,0 @@
-package eu.faircode.email;
-
-/*
-    This file is part of FairEmail.
-
-    FairEmail is free software: you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation, either version 3 of the License, or
-    (at your option) any later version.
-
-    FairEmail is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with FairEmail.  If not, see <http://www.gnu.org/licenses/>.
-
-    Copyright 2018-2019 by Marcel Bokhorst (M66B)
-*/
-
-import javax.mail.Address;
-
-public class TupleMessageLookup {
-    public long id;
-    public Address[] from;
-    public String avatar;
-}