added 'automatic dark theme' option

res/values-bg/strings.xml

@@ -69,4 +69,7 @@
 	<string name="key_volume_up">Усилване на звук</string>
 	<string name="dictionary_truncating">Изтриване…</string>
 	<string name="error">Грешка</string>
+	<string name="pref_dark_theme_yes">Да</string>
+	<string name="pref_dark_theme_no">Не</string>
+	<string name="pref_dark_theme_auto">Автоматично</string>
 </resources>

res/values-de/strings.xml

@@ -23,4 +23,7 @@
 	<string name="char_newline">Neue Zeile</string>
 	<string name="pref_category_setup">Ersteinrichtung</string>
 	<string name="error">Fehler</string>
+	<string name="pref_dark_theme_yes">Ja</string>
+	<string name="pref_dark_theme_no">Nein</string>
+	<string name="pref_dark_theme_auto">Automatisch</string>
 </resources>

res/values-es/strings.xml

@@ -69,4 +69,7 @@
 	<string name="key_call">Llamar</string>
 	<string name="key_volume_down">Bajar volumen</string>
 	<string name="key_volume_up">Subir Volumen</string>
+	<string name="pref_dark_theme_yes">Sí</string>
+	<string name="pref_dark_theme_no">No</string>
+	<string name="pref_dark_theme_auto">Automática</string>
 </resources>

res/values-fr/strings.xml

@@ -64,4 +64,7 @@
 	<string name="pref_show_soft_numpad">Pavé numérique à l\'écran</string>
 	<string name="dictionary_truncating">Suppression…</string>
 	<string name="error">Erreur</string>
+	<string name="pref_dark_theme_yes">Oui</string>
+	<string name="pref_dark_theme_no">Non</string>
+	<string name="pref_dark_theme_auto">Automatique</string>
 </resources>

res/values-it/strings.xml

@@ -32,5 +32,8 @@
 	<string name="pref_upside_down_keys_summary">Abilita l\'impostazione se ci sono 7–8–9 sulla prima riga, invece di 1–2–3.</string>
 	<string name="pref_category_setup">Configurazione iniziale</string>
 	<string name="error">Errore</string>
+	<string name="pref_dark_theme_yes">Si</string>
+	<string name="pref_dark_theme_no">No</string>
+	<string name="pref_dark_theme_auto">Automatica</string>
 </resources>
 

res/values-iw/strings.xml

@@ -55,4 +55,7 @@
 	<string name="char_newline">שורה חדשה</string>
 	<string name="char_space">רווח</string>
 	<string name="error">טעות</string>
+	<string name="pref_dark_theme_yes">כן</string>
+	<string name="pref_dark_theme_no">לא</string>
+	<string name="pref_dark_theme_auto">אוטומטי</string>
 </resources>

res/values-nl/strings.xml

@@ -23,4 +23,7 @@
 	<string name="pref_category_setup">Initiële setup</string>
 	<string name="dictionary_truncating">Verwijderen…</string>
 	<string name="error">Fout</string>
+	<string name="pref_dark_theme_yes">Ja</string>
+	<string name="pref_dark_theme_no">Nee</string>
+	<string name="pref_dark_theme_auto">Automatisch</string>
 </resources>

res/values-pt-rBR/strings.xml

@@ -58,4 +58,7 @@
 	<string name="pref_upside_down_keys">Inverter Ordem das Teclas</string>
 	<string name="dictionary_truncate_unselected">Limpar Não Selecionados</string>
 	<string name="error">Erro</string>
+	<string name="pref_dark_theme_yes">Sim</string>
+	<string name="pref_dark_theme_no">Não</string>
+	<string name="pref_dark_theme_auto">Automático</string>
 </resources>

res/values-ru/strings.xml

@@ -69,4 +69,7 @@
 	<string name="key_volume_up">Увеличить громкости</string>
 	<string name="dictionary_truncating">Удаление…</string>
 	<string name="error">Ошибка</string>
+	<string name="pref_dark_theme_yes">Да</string>
+	<string name="pref_dark_theme_no">Нет</string>
+	<string name="pref_dark_theme_auto">Автоматически</string>
 </resources>

res/values-uk/strings.xml

@@ -69,4 +69,7 @@
 	<string name="key_volume_down">Зменшення гучності</string>
 	<string name="dictionary_truncating">Видалення…</string>
 	<string name="error">Помилка</string>
+	<string name="pref_dark_theme_yes">Так</string>
+	<string name="pref_dark_theme_no">Ні</string>
+	<string name="pref_dark_theme_auto">Автоматично</string>
 </resources>

res/values/strings.xml

@@ -35,6 +35,9 @@
 	<string name="pref_auto_text_case_summary">Automatically start sentences with a capital letter.</string>
 	<string name="pref_choose_languages">Languages</string>
 	<string name="pref_dark_theme">Dark Theme</string>
+	<string name="pref_dark_theme_yes">Yes</string>
+	<string name="pref_dark_theme_no">No</string>
+	<string name="pref_dark_theme_auto">Auto</string>
 	<string name="pref_double_zero_char">Character for Double 0-key Press</string>
 	<string name="pref_show_soft_function_keys">Show On-Screen Keys</string>
 	<string name="pref_show_soft_numpad">Show On-Screen Numpad</string>

res/xml/prefs_screen_appearance.xml

@@ -1,10 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
 <PreferenceScreen xmlns:app="http://schemas.android.com/apk/res-auto"  app:orderingFromXml="true">
 
-	<SwitchPreferenceCompat
-		app:defaultValue="true"
-		app:key="pref_dark_theme"
-		app:layout="@layout/pref_switch"
+	<DropDownPreference
+		app:defaultValue="-1"
+		app:iconSpaceReserved="false"
+		app:key="pref_theme"
+		app:layout="@layout/pref_dropdown"
 		app:title="@string/pref_dark_theme" />
 
 	<SwitchPreferenceCompat

src/io/github/sspanak/tt9/preferences/PreferencesActivity.java

@@ -136,9 +136,7 @@ public class PreferencesActivity extends AppCompatActivity implements Preference
 
 
 	private void applyTheme() {
-		AppCompatDelegate.setDefaultNightMode(
-			settings.getDarkTheme() ? AppCompatDelegate.MODE_NIGHT_YES : AppCompatDelegate.MODE_NIGHT_NO
-		);
+		AppCompatDelegate.setDefaultNightMode(settings.getTheme());
 	}
 
 

src/io/github/sspanak/tt9/preferences/SettingsStore.java

@@ -2,7 +2,9 @@ package io.github.sspanak.tt9.preferences;
 
 import android.content.Context;
 import android.content.SharedPreferences;
+import android.content.res.Configuration;
 
+import androidx.appcompat.app.AppCompatDelegate;
 import androidx.preference.PreferenceManager;
 
 import java.util.ArrayList;
@@ -226,7 +228,22 @@ public class SettingsStore {
 
 	/************* UI settings *************/
 
-	public boolean getDarkTheme() { return prefs.getBoolean("pref_dark_theme", true); }
+	public boolean getDarkTheme() {
+		int theme = getTheme();
+		if (theme == AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM) {
+			return (context.getResources().getConfiguration().uiMode & Configuration.UI_MODE_NIGHT_MASK) == Configuration.UI_MODE_NIGHT_YES;
+		} else {
+			return theme == AppCompatDelegate.MODE_NIGHT_YES;
+		}
+	}
+
+	public int getTheme() {
+		try {
+			return Integer.parseInt(prefs.getString("pref_theme", String.valueOf(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM)));
+		} catch (NumberFormatException e) {
+			return AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM;
+		}
+	}
 
 	public boolean getShowSoftKeys() { return prefs.getBoolean("pref_show_soft_keys", true); }
 

src/io/github/sspanak/tt9/preferences/items/ItemDropDown.java

@@ -0,0 +1,72 @@
+package io.github.sspanak.tt9.preferences.items;
+
+import androidx.preference.DropDownPreference;
+import androidx.preference.Preference;
+
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+
+import io.github.sspanak.tt9.Logger;
+
+public class ItemDropDown {
+	private final DropDownPreference item;
+	private LinkedHashMap<Integer, String> values;
+
+	public ItemDropDown(DropDownPreference item) {
+		this.item = item;
+	}
+
+	protected void populate(LinkedHashMap<Integer, String> values) {
+		if (item == null) {
+			Logger.w("tt9/ItemDropDown.populate", "Cannot populate a NULL item. Ignoring.");
+			return;
+		}
+
+		this.values = values != null ? values : new LinkedHashMap<>();
+
+		ArrayList<String> keys = new ArrayList<>();
+		for (int key : this.values.keySet()) {
+			keys.add(String.valueOf(key));
+		}
+
+		item.setEntryValues(keys.toArray(new CharSequence[0]));
+		item.setEntries(this.values.values().toArray(new CharSequence[0]));
+	}
+
+	public ItemDropDown enableClickHandler() {
+		if (item == null) {
+			Logger.w("tt9/SectionKeymap.populateItem", "Cannot set a click listener a NULL item. Ignoring.");
+			return this;
+		}
+
+		item.setOnPreferenceChangeListener(this::onClick);
+		return this;
+	}
+
+	protected boolean onClick(Preference preference, Object newKey) {
+		try {
+			String previewValue = values.get(Integer.parseInt(newKey.toString()));
+			((DropDownPreference) preference).setValue(newKey.toString());
+			setPreview(previewValue);
+			return true;
+		} catch (NumberFormatException e) {
+			return false;
+		}
+	}
+
+	private void setPreview(String value) {
+		if (item != null) {
+			item.setSummary(value);
+		}
+	}
+
+	public ItemDropDown preview() {
+		try {
+			setPreview(values.get(Integer.parseInt(item.getValue())));
+		} catch (NumberFormatException e) {
+			setPreview("");
+		}
+
+		return this;
+	}
+}

src/io/github/sspanak/tt9/preferences/items/ItemSelectTheme.java

@@ -0,0 +1,43 @@
+package io.github.sspanak.tt9.preferences.items;
+
+import android.content.Context;
+
+import androidx.appcompat.app.AppCompatDelegate;
+import androidx.preference.DropDownPreference;
+import androidx.preference.Preference;
+
+import java.util.LinkedHashMap;
+
+import io.github.sspanak.tt9.R;
+
+public class ItemSelectTheme extends ItemDropDown {
+	public static final String NAME = "pref_theme";
+
+	private final Context context;
+
+	public ItemSelectTheme(Context context, DropDownPreference item) {
+		super(item);
+		this.context = context;
+	}
+
+	public ItemDropDown populate() {
+		LinkedHashMap<Integer, String> themes = new LinkedHashMap<>();
+		themes.put(AppCompatDelegate.MODE_NIGHT_FOLLOW_SYSTEM, context.getString(R.string.pref_dark_theme_auto));
+		themes.put(AppCompatDelegate.MODE_NIGHT_NO, context.getString(R.string.pref_dark_theme_no));
+		themes.put(AppCompatDelegate.MODE_NIGHT_YES, context.getString(R.string.pref_dark_theme_yes));
+
+		super.populate(themes);
+
+		return this;
+	}
+
+	@Override
+	protected boolean onClick(Preference preference, Object newKey) {
+		if (super.onClick(preference, newKey)) {
+			AppCompatDelegate.setDefaultNightMode(Integer.parseInt(newKey.toString()));
+			return true;
+		}
+
+		return false;
+	}
+}

src/io/github/sspanak/tt9/preferences/items/ItemToggleDarkTheme.java

@@ -1,27 +0,0 @@
-package io.github.sspanak.tt9.preferences.items;
-
-import androidx.appcompat.app.AppCompatDelegate;
-import androidx.preference.Preference;
-import androidx.preference.SwitchPreferenceCompat;
-
-public class ItemToggleDarkTheme {
-	public static final String NAME = "pref_dark_theme";
-
-	private final SwitchPreferenceCompat themeToggle;
-
-	public ItemToggleDarkTheme(SwitchPreferenceCompat item) {
-		themeToggle = item;
-	}
-
-	public void enableToggleHandler() {
-		themeToggle.setOnPreferenceChangeListener(this::onChange);
-	}
-
-	private boolean onChange(Preference p, Object newValue) {
-		AppCompatDelegate.setDefaultNightMode(
-			((boolean) newValue) ? AppCompatDelegate.MODE_NIGHT_YES : AppCompatDelegate.MODE_NIGHT_NO
-		);
-
-		return true;
-	}
-}

src/io/github/sspanak/tt9/preferences/screens/AppearanceScreen.java

@@ -2,7 +2,7 @@ package io.github.sspanak.tt9.preferences.screens;
 
 import io.github.sspanak.tt9.R;
 import io.github.sspanak.tt9.preferences.PreferencesActivity;
-import io.github.sspanak.tt9.preferences.items.ItemToggleDarkTheme;
+import io.github.sspanak.tt9.preferences.items.ItemSelectTheme;
 
 public class AppearanceScreen extends BaseScreenFragment {
 	public AppearanceScreen() { init(); }
@@ -13,6 +13,9 @@ public class AppearanceScreen extends BaseScreenFragment {
 
 	@Override
 	protected void onCreate() {
-		(new ItemToggleDarkTheme(findPreference(ItemToggleDarkTheme.NAME))).enableToggleHandler();
+		(new ItemSelectTheme(activity, findPreference(ItemSelectTheme.NAME)))
+			.populate()
+			.enableClickHandler()
+			.preview();
 	}
 }

src/io/github/sspanak/tt9/ui/AddWordAct.java

@@ -27,9 +27,7 @@ public class AddWordAct extends AppCompatActivity {
 	protected void onCreate(Bundle savedData) {
 		settings = new SettingsStore(this);
 
-		AppCompatDelegate.setDefaultNightMode(
-			settings.getDarkTheme() ? AppCompatDelegate.MODE_NIGHT_YES : AppCompatDelegate.MODE_NIGHT_NO
-		);
+		AppCompatDelegate.setDefaultNightMode(settings.getTheme());
 
 		super.onCreate(savedData);