Android: Add dark theme

android/app/src/main/java/com/github/stenzek/duckstation/MainActivity.java

@@ -9,6 +9,7 @@ import android.content.pm.PackageManager;
 import android.content.res.Configuration;
 import android.content.res.Resources;
 import android.net.Uri;
+import android.os.Build;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.Gravity;
@@ -22,6 +23,7 @@ import android.widget.Toast;
 
 import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.app.AppCompatActivity;
+import androidx.appcompat.app.AppCompatDelegate;
 import androidx.appcompat.widget.Toolbar;
 import androidx.core.app.ActivityCompat;
 import androidx.core.content.ContextCompat;
@@ -40,6 +42,7 @@ public class MainActivity extends AppCompatActivity {
     private static final int REQUEST_ADD_DIRECTORY_TO_GAME_LIST = 2;
     private static final int REQUEST_IMPORT_BIOS_IMAGE = 3;
     private static final int REQUEST_START_FILE = 4;
+    private static final int REQUEST_SETTINGS = 5;
 
     private GameList mGameList;
     private ListView mGameListView;
@@ -64,6 +67,26 @@ public class MainActivity extends AppCompatActivity {
         res.updateConfiguration(config, res.getDisplayMetrics());
     }
 
+    private void setTheme() {
+        String theme = PreferenceManager.getDefaultSharedPreferences(this).getString("Main/Theme", "follow_system");
+        if (theme == null)
+            return;
+
+        if (theme.equals("follow_system")) {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q)
+                AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM);
+        } else if (theme.equals("light")) {
+            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
+        } else if (theme.equals("dark")) {
+            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
+        }
+    }
+
+    private void loadSettings() {
+        setLanguage();
+        setTheme();
+    }
+
     private boolean shouldResumeStateByDefault() {
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
         return prefs.getBoolean("Main/SaveStateOnExit", true);
@@ -81,7 +104,7 @@ public class MainActivity extends AppCompatActivity {
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
-        setLanguage();
+        loadSettings();
 
         setContentView(R.layout.activity_main);
         Toolbar toolbar = findViewById(R.id.toolbar);
@@ -193,7 +216,7 @@ public class MainActivity extends AppCompatActivity {
             importBIOSImage();
         } else if (id == R.id.action_settings) {
             Intent intent = new Intent(this, SettingsActivity.class);
-            startActivity(intent);
+            startActivityForResult(intent, REQUEST_SETTINGS);
             return true;
         } else if (id == R.id.action_show_version) {
             showVersion();
@@ -287,6 +310,11 @@ public class MainActivity extends AppCompatActivity {
                 startEmulation(path, shouldResumeStateByDefault());
             }
             break;
+
+            case REQUEST_SETTINGS: {
+                loadSettings();
+            }
+            break;
         }
     }
 

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

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#000000</color>
+    <color name="colorPrimaryDark">#000000</color>
+    <color name="colorAccent">#03A9F4</color>
+
+    <color name="black_overlay">#66000000</color>
+</resources>

android/app/src/main/res/values/arrays.xml

@@ -440,4 +440,14 @@
         <item>it-IT</item>
         <item>nl-NL</item>
     </string-array>
+    <string-array name="settings_theme_entries">
+        <item>Follow System</item>
+        <item>Light</item>
+        <item>Dark</item>
+    </string-array>
+    <string-array name="settings_theme_values">
+        <item>follow_system</item>
+        <item>light</item>
+        <item>dark</item>
+    </string-array>
 </resources>

android/app/src/main/res/values/colors.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <color name="colorPrimary">#008577</color>
+    <color name="colorPrimary">#6200EE</color>
-    <color name="colorPrimaryDark">#00574B</color>
+    <color name="colorPrimaryDark">#3700B3</color>
     <color name="colorAccent">#D81B60</color>
 
     <color name="black_overlay">#66000000</color>

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

@@ -159,4 +159,5 @@
     <string name="touchscreen_controller_stop_editing">Stop Editing</string>
     <string name="touchscreen_controller_reset_layout">Reset Layout</string>
     <string name="emulation_activity_touchscreen_controller_not_active">Touchscreen controller is not active.</string>
+    <string name="settings_theme">Theme</string>
 </resources>

android/app/src/main/res/values/styles.xml

@@ -1,10 +1,10 @@
 <resources>
 
     <!-- Base application theme. -->
-    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+    <style name="AppTheme" parent="Theme.AppCompat.DayNight.DarkActionBar">
         <!-- Customize your theme here. -->
-        <item name="colorPrimary">@color/design_default_color_primary</item>
+        <item name="colorPrimary">@color/colorPrimary</item>
-        <item name="colorPrimaryDark">@color/design_default_color_primary_dark</item>
+        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
         <item name="colorAccent">@color/colorAccent</item>
     </style>
 
@@ -15,7 +15,7 @@
 
     <style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />
 
-    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />
+    <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.DayNight" />
 
     <style name="FullscreenTheme" parent="AppTheme">
         <item name="android:actionBarStyle">@style/FullscreenActionBarStyle</item>

android/app/src/main/res/xml/general_preferences.xml

@@ -44,6 +44,14 @@
         app:defaultValue="false"
         app:summary="@string/settings_summary_pause_when_menu_opened"
         app:iconSpaceReserved="false" />
+    <ListPreference
+        app:key="Main/Theme"
+        app:title="@string/settings_theme"
+        app:entries="@array/settings_theme_entries"
+        app:entryValues="@array/settings_theme_values"
+        app:defaultValue="follow_system"
+        app:useSimpleSummaryProvider="true"
+        app:iconSpaceReserved="false" />
     <ListPreference
         app:key="Main/EmulationScreenOrientation"
         app:title="@string/settings_emulation_screen_orientation"