res/values/shortcut_keys.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
     Copyright (C) 2011 Google Inc.
     Licensed to 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.
-->
<resources>
    <!-- All shortcuts need to be combined with CTRL -->

    <!-- open compose -->
    <string name="trigger_compose_char" translatable="false">n</string>
    <!-- archive, can also be remove folder when archive is not applicable -->
    <string name="trigger_archive_char" translatable="false">d</string>
    <!-- delete (\u0008 is BACKSPACE), can also be clear trash/spam -->
    <!-- TODO: there is a separate ASCII for DEL, should we support that? -->
    <string name="trigger_delete_char" translatable="false">\u0008</string>
    <!-- send (TODO: looks like edittext is consuming this event) -->
    <string name="trigger_send_char" translatable="false">\u000a</string>
    <!-- save draft -->
    <string name="trigger_save_char" translatable="false">s</string>
    <!-- manual refresh -->
    <string name="trigger_refresh_char" translatable="false">u</string>
    <!-- open navigation drawer -->
    <string name="trigger_toggle_drawer_char" translatable="false">m</string>
    <!-- Settings -->
    <string name="trigger_settings_char" translatable="false">,</string>
    <!-- Help & Feedback -->
    <string name="trigger_help_char" translatable="false">/</string>
    <!-- reply TODO -->
    <string name="trigger_reply_char" translatable="false">`</string>
    <!-- reply all -->
    <string name="trigger_reply_all_char" translatable="false">r</string>
    <!-- mark as read/unread -->
    <string name="trigger_toggle_read_unread_char" translatable="false">i</string>
    <!-- change label -->
    <string name="trigger_change_label_char" translatable="false">l</string>
    <!-- print -->
    <string name="trigger_print_char" translatable="false">p</string>
    <!-- undo in snack bar TODO punted -->
    <string name="trigger_undo_char" translatable="false">z</string>

</resources>