Added advanced option to store sent messages

Refs #29

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

@@ -0,0 +1,71 @@
+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.
+
+    NetGuard 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 NetGuard.  If not, see <http://www.gnu.org/licenses/>.
+
+    Copyright 2018 by Marcel Bokhorst (M66B)
+*/
+
+import android.content.SharedPreferences;
+import android.os.Bundle;
+import android.preference.PreferenceManager;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.CheckBox;
+import android.widget.CompoundButton;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+public class FragmentOptions extends FragmentEx {
+    private CheckBox cbStoreSent;
+    private CheckBox cbDebug;
+
+    @Override
+    @Nullable
+    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
+        setSubtitle(R.string.title_advanced);
+
+        View view = inflater.inflate(R.layout.fragment_options, container, false);
+
+        // Get controls
+        cbStoreSent = view.findViewById(R.id.cbStoreSent);
+        cbDebug = view.findViewById(R.id.cbDebug);
+
+        // Wire controls
+
+        final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getContext());
+
+        cbStoreSent.setChecked(prefs.getBoolean("store_sent", false));
+        cbStoreSent.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+            @Override
+            public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
+                prefs.edit().putBoolean("store_sent", checked).apply();
+            }
+        });
+
+        cbDebug.setChecked(prefs.getBoolean("debug", false));
+        cbDebug.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+            @Override
+            public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
+                prefs.edit().putBoolean("debug", checked).apply();
+            }
+        });
+
+        return view;
+    }
+}