Added rule/group suggestions

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

@@ -62,6 +62,11 @@ public interface DaoRule {
             " WHERE rule.folder = :folder")
     LiveData<List<TupleRuleEx>> liveRules(long folder);
 
+    @Query("SELECT DISTINCT `group` FROM rule" +
+            " WHERE NOT `group` IS NULL" +
+            " ORDER by `group` COLLATE NOCASE")
+    List<String> getGroups();
+
     @Query("SELECT COUNT(*) FROM rule")
     int countTotal();
 

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

@@ -0,0 +1,41 @@
+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 2018-2023 by Marcel Bokhorst (M66B)
+*/
+
+import android.content.Context;
+import android.util.AttributeSet;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.appcompat.widget.AppCompatAutoCompleteTextView;
+
+public class EditTextAutoComplete extends AppCompatAutoCompleteTextView {
+    public EditTextAutoComplete(@NonNull Context context) {
+        super(context);
+    }
+
+    public EditTextAutoComplete(@NonNull Context context, @Nullable AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public EditTextAutoComplete(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+}

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

@@ -43,6 +43,7 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.widget.AdapterView;
 import android.widget.ArrayAdapter;
+import android.widget.AutoCompleteTextView;
 import android.widget.Button;
 import android.widget.CheckBox;
 import android.widget.CompoundButton;
@@ -86,7 +87,7 @@ public class FragmentRule extends FragmentBase {
 
     private TextView tvFolder;
     private EditText etName;
-    private EditText etGroup;
+    private AutoCompleteTextView etGroup;
     private EditText etOrder;
     private CheckBox cbEnabled;
     private CheckBox cbDaily;
@@ -185,6 +186,7 @@ public class FragmentRule extends FragmentBase {
     private Group grpDelete;
     private Group grpLocalOnly;
 
+    private ArrayAdapter<String> adapterGroup;
     private ArrayAdapter<String> adapterDay;
     private ArrayAdapter<Action> adapterAction;
     private ArrayAdapter<EntityIdentity> adapterIdentity;
@@ -369,6 +371,10 @@ public class FragmentRule extends FragmentBase {
         grpDelete = view.findViewById(R.id.grpDelete);
         grpLocalOnly = view.findViewById(R.id.grpLocalOnly);
 
+        adapterGroup = new ArrayAdapter<>(getContext(), R.layout.spinner_item1_dropdown, android.R.id.text1);
+        etGroup.setThreshold(1);
+        etGroup.setAdapter(adapterGroup);
+
         cbDaily.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
             @Override
             public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
@@ -839,6 +845,7 @@ public class FragmentRule extends FragmentBase {
                 DB db = DB.getInstance(context);
                 data.account = db.account().getAccount(aid);
                 data.folder = db.folder().getFolder(fid);
+                data.groups = db.rule().getGroups();
                 data.identities = db.identity().getSynchronizingIdentities(aid);
                 data.answers = db.answer().getAnswers(false);
 
@@ -851,6 +858,9 @@ public class FragmentRule extends FragmentBase {
                         data.account == null ? "" : data.account.name,
                         data.folder.getDisplayName(getContext())));
 
+                adapterGroup.clear();
+                adapterGroup.addAll(data.groups);
+
                 adapterIdentity.clear();
                 adapterIdentity.addAll(data.identities);
 
@@ -1692,6 +1702,7 @@ public class FragmentRule extends FragmentBase {
     private static class RefData {
         EntityAccount account;
         EntityFolder folder;
+        List<String> groups;
         List<EntityIdentity> identities;
         List<EntityAnswer> answers;
     }

app/src/main/res/layout/fragment_rule.xml

@@ -81,7 +81,7 @@
                     app:layout_constraintStart_toStartOf="parent"
                     app:layout_constraintTop_toBottomOf="@id/etName" />
 
-                <eu.faircode.email.EditTextPlain
+                <eu.faircode.email.EditTextAutoComplete
                     android:id="@+id/etGroup"
                     android:layout_width="0dp"
                     android:layout_height="wrap_content"