I lied. THIS is 2018.2-beta1. I'll sneak in a theme setting too.

Author: 19lmyers

app/src/main/java/com/team980/thunderscout/ThunderScout.java

@@ -31,6 +31,7 @@
 import android.preference.PreferenceManager;
 import android.service.quicksettings.TileService;
 import android.support.multidex.MultiDexApplication;
+import android.support.v7.app.AppCompatDelegate;
 
 import com.crashlytics.android.Crashlytics;
 import com.crashlytics.android.core.CrashlyticsCore;
@@ -106,6 +107,11 @@ public void onCreate() { //This isn't why loading is slow
             Fabric.with(this, crashlyticsKit);
         }
 
+        if (sharedPref.getBoolean(getResources().getString(R.string.pref_app_theme), false)) {
+            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
+        } else {
+            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
+        }
     }
 
     @Override

app/src/main/java/com/team980/thunderscout/preferences/SettingsActivity.java

@@ -32,6 +32,7 @@
 import android.provider.Settings;
 import android.support.annotation.Nullable;
 import android.support.v7.app.AppCompatActivity;
+import android.support.v7.app.AppCompatDelegate;
 import android.support.v7.preference.EditTextPreference;
 import android.support.v7.preference.ListPreference;
 import android.support.v7.preference.Preference;
@@ -245,6 +246,27 @@ public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
         }
     }
 
+    public static class AppearancePreferenceFragment extends PreferenceFragmentCompat {
+        @Override
+        public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
+            addPreferencesFromResource(R.xml.pref_appearance);
+
+            SettingsActivity activity = (SettingsActivity) getActivity();
+            activity.getSupportActionBar().setTitle("Theme settings [BETA]");
+
+            findPreference(getResources().getString(R.string.pref_app_theme))
+                    .setOnPreferenceChangeListener((preference, newValue) -> {
+                        if ((boolean) newValue) {
+                            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
+                        } else {
+                            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
+                        }
+                        activity.recreate();
+                        return true;
+                    });
+        }
+    }
+
     public static class MatchScoutPreferenceFragment extends PreferenceFragmentCompat {
         @Override
         public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {

app/src/main/res/values-night/colors.xml

@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ MIT License
+  ~
+  ~ Copyright (c) 2016 - 2018 Luke Myers (FRC Team 980 ThunderBots)
+  ~
+  ~ Permission is hereby granted, free of charge, to any person obtaining a copy
+  ~ of this software and associated documentation files (the "Software"), to deal
+  ~ in the Software without restriction, including without limitation the rights
+  ~ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+  ~ copies of the Software, and to permit persons to whom the Software is
+  ~ furnished to do so, subject to the following conditions:
+  ~
+  ~ The above copyright notice and this permission notice shall be included in all
+  ~ copies or substantial portions of the Software.
+  ~
+  ~ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+  ~ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+  ~ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+  ~ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+  ~ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+  ~ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+  ~ SOFTWARE.
+  -->
+
+<resources>
+    <color name="primary">#222</color>
+    <color name="primary_dark">#111</color>
+</resources>

app/src/main/res/values/strings.xml

@@ -49,7 +49,7 @@
         \n
         \n(Oh, and the team info screen now incorporates individual match tabs.)
         \n
-        \nTechnical note: ThunderCloud is being in a separate branch from the rest of the app, and may change significantly or disappear in subsequent releases.
+        \nTechnical note: ThunderCloud is being developed in a separate branch from the rest of the app, and may change significantly or disappear in subsequent releases.
         </string>
 
     <!--- TODO remove before flight (stable) -->

app/src/main/res/xml/pref_appearance.xml

@@ -22,7 +22,12 @@
   ~ SOFTWARE.
   -->
 
-<PreferenceScreen>
+<android.support.v7.preference.PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <android.support.v7.preference.SwitchPreferenceCompat
+        android:key="@string/pref_app_theme"
+        android:summary="Internal testing only - this will change or disappear in the future!"
+        android:title="Use beta theme" />
 
     <!--<android.support.v7.preference.ListPreference
         android:title="Theme"
@@ -33,4 +38,4 @@
         android:summary="May help prevent burn in on OLED devices"
         android:key="@string/pref_tint_navigation_bar"/>-->
 
-</PreferenceScreen>
+</android.support.v7.preference.PreferenceScreen>

app/src/main/res/xml/pref_main.xml

@@ -33,13 +33,6 @@
         android:title="General settings"
         app:allowDividerBelow="false" />
 
-    <!--<android.support.v7.preference.Preference
-        app:allowDividerBelow="false"
-        android:fragment="com.team980.thunderscout.preferences.SettingsActivity$AppearancePreferenceFragment"
-        android:icon="@drawable/ic_brush_white_24dp"
-        android:layout="@layout/preference_backport_material"
-        android:title="Appearance" />-->
-
     <com.team980.thunderscout.preferences.backport.MasterSwitchPreference
         android:defaultValue="true"
         android:fragment="com.team980.thunderscout.preferences.SettingsActivity$MatchScoutPreferenceFragment"
@@ -66,6 +59,14 @@
         android:title="ThunderCloud"
         app:allowDividerBelow="false" />
 
+    <android.support.v7.preference.Preference
+        android:fragment="com.team980.thunderscout.preferences.SettingsActivity$AppearancePreferenceFragment"
+        android:icon="@drawable/ic_brush_white_24dp"
+        android:layout="@layout/preference_backport_material"
+        android:summary="Expect these to change or break in future releases!"
+        android:title="Theme settings [BETA]"
+        app:allowDividerBelow="false" />
+
     <android.support.v7.preference.Preference
         android:icon="@drawable/ic_notification_white_24dp"
         android:key="@string/pref_notification_settings"