New languages screen (#595)

* added a dictionary size property

* new language selection screen

* added a language search field

* SettingsStore now return a copy of the enabled languages to prevent accidental overwriting of the original settings object

app/build.gradle

@@ -103,8 +103,14 @@ android {
 
 	flavorDimensions = ['app']
 	productFlavors {
-		full { dimension 'app' }
+		full {
-		lite { dimension 'app' }
+			dimension 'app'
+			buildConfigField 'Boolean', 'LITE', 'false'
+		}
+		lite {
+			dimension 'app'
+			buildConfigField 'Boolean', 'LITE', 'true'
+		}
 	}
 
 	applicationVariants.configureEach { variant ->

app/dictionary-tools.gradle

@@ -2,8 +2,9 @@ ext.getDictionaryProperties = { dictionariesDir, sizesDir ->
 	fileTree(dir: dictionariesDir).getFiles().parallelStream().forEach {dictionary ->
 		def hash = dictionary.exists() ? dictionary.text.digest("SHA-1") : ""
 		def revision = dictionary.exists() ? exec("git log --pretty=tformat:%H -n 1 ${dictionary}") : ""
+		def size = dictionary.exists() ? dictionary.length() : 0
 		def words = dictionary.exists() ? dictionary.text.split("\n").length : 0
 
-		new File(sizesDir, "${dictionary.getName()}.props.yml").text = "hash: ${hash}\nrevision: ${revision}\nwords: ${words}"
+		new File(sizesDir, "${dictionary.getName()}.props.yml").text = "hash: ${hash}\nrevision: ${revision}\nsize: ${size}\nwords: ${words}"
 	}
 }

app/src/main/java/io/github/sspanak/tt9/db/WordStore.java

@@ -53,6 +53,26 @@ public class WordStore {
 	}
 
 
+	/**
+	 * Returns a list of the languages that are already loaded in the database.
+	 */
+	public ArrayList<Integer> exists(ArrayList<Language> languages) {
+		ArrayList<Integer> loadedLanguages = new ArrayList<>();
+
+		if (!checkOrNotify()) {
+			return loadedLanguages;
+		}
+
+		for (Language language : languages) {
+			if (readOps.exists(sqlite.getDb(), language.getId())) {
+				loadedLanguages.add(language.getId());
+			}
+		}
+
+		return loadedLanguages;
+	}
+
+
 	/**
 	 * Loads words matching and similar to a given digit sequence
 	 * For example: "7655" -> "roll" (exact match), but also: "rolled", "roller", "rolling", ...

app/src/main/java/io/github/sspanak/tt9/db/WordStoreAsync.java

@@ -79,4 +79,11 @@ public class WordStoreAsync {
 			getStore().getSimilarCustom(language, wordFilter)))
 		).start();
 	}
+
+
+	public static void exists(ConsumerCompat<ArrayList<Integer>> dataHandler, ArrayList<Language> languages) {
+		new Thread(() -> asyncHandler.post(() -> dataHandler.accept(
+			getStore().exists(languages))
+		)).start();
+	}
 }

app/src/main/java/io/github/sspanak/tt9/db/entities/WordFile.java

@@ -24,6 +24,7 @@ public class WordFile {
 	private String hash = null;
 	private String downloadUrl = null;
 	private int totalLines = -1;
+	private long size = -1;
 
 
 	public WordFile(Context context, String name, AssetManager assets) {
@@ -151,6 +152,29 @@ public class WordFile {
 	}
 
 
+	public long getSize() {
+		if (size < 0) {
+			loadProperties();
+		}
+
+		return size;
+	}
+
+
+	private void setSize(String rawProperty, String rawValue) {
+		if (!rawProperty.equals("size")) {
+			return;
+		}
+
+		try {
+			size = Long.parseLong(rawValue);
+		} catch (Exception e) {
+			Logger.w(LOG_TAG, "Invalid 'size' property of: " + name + ". Expecting an integer, got: '" + rawValue + "'.");
+			size = 0;
+		}
+	}
+
+
 	private void loadProperties() {
 		String propertyFilename = name + ".props.yml";
 
@@ -164,6 +188,7 @@ public class WordFile {
 				setDownloadUrl(parts[0], parts[1]);
 				setHash(parts[0], parts[1]);
 				setTotalLines(parts[0], parts[1]);
+				setSize(parts[0], parts[1]);
 			}
 		} catch (Exception e) {
 			Logger.w(LOG_TAG, "Could not read the property file: " + propertyFilename + ". " + e.getMessage());

app/src/main/java/io/github/sspanak/tt9/languages/NaturalLanguage.java

@@ -17,6 +17,7 @@ public class NaturalLanguage extends Language implements Comparable<NaturalLangu
 	final public static String PREFERRED_CHAR_SEQUENCE = "00";
 
 
+	private String localizedName = null;
 	protected final ArrayList<ArrayList<String>> layout = new ArrayList<>();
 	private final HashMap<Character, String> characterKeyMap = new HashMap<>();
 
@@ -183,6 +184,15 @@ public class NaturalLanguage extends Language implements Comparable<NaturalLangu
 	}
 
 
+	public String getLocalizedName() {
+		if (localizedName == null) {
+			localizedName = locale.getDisplayName();
+		}
+
+		return localizedName;
+	}
+
+
 	private void generateCharacterKeyMap() {
 		characterKeyMap.clear();
 		for (int digit = 0; digit <= 9; digit++) {

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

@@ -25,6 +25,7 @@ import io.github.sspanak.tt9.preferences.screens.debug.DebugScreen;
 import io.github.sspanak.tt9.preferences.screens.deleteWords.DeleteWordsScreen;
 import io.github.sspanak.tt9.preferences.screens.hotkeys.HotkeysScreen;
 import io.github.sspanak.tt9.preferences.screens.keypad.KeyPadScreen;
+import io.github.sspanak.tt9.preferences.screens.languageSelection.LanguageSelectionScreen;
 import io.github.sspanak.tt9.preferences.screens.languages.LanguagesScreen;
 import io.github.sspanak.tt9.preferences.screens.main.MainSettingsScreen;
 import io.github.sspanak.tt9.preferences.screens.setup.SetupScreen;
@@ -143,6 +144,8 @@ public class PreferencesActivity extends ActivityWithNavigation implements Prefe
 				return new KeyPadScreen(this);
 			case LanguagesScreen.NAME:
 				return new LanguagesScreen(this);
+			case LanguageSelectionScreen.NAME:
+				return new LanguageSelectionScreen(this);
 			case SetupScreen.NAME:
 				return new SetupScreen(this);
 			case UsageStatsScreen.NAME:

app/src/main/java/io/github/sspanak/tt9/preferences/items/ItemTextInput.java

@@ -0,0 +1,68 @@
+package io.github.sspanak.tt9.preferences.items;
+
+import android.content.Context;
+import android.os.Handler;
+import android.os.Looper;
+import android.text.Editable;
+import android.text.TextWatcher;
+import android.util.AttributeSet;
+import android.widget.EditText;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.preference.PreferenceViewHolder;
+
+import io.github.sspanak.tt9.R;
+import io.github.sspanak.tt9.preferences.custom.ScreenPreference;
+import io.github.sspanak.tt9.preferences.settings.SettingsStore;
+import io.github.sspanak.tt9.util.Logger;
+
+abstract public class ItemTextInput extends ScreenPreference implements TextWatcher {
+	@NonNull private final Handler debouncer = new Handler(Looper.getMainLooper());
+	private int debounceTime = SettingsStore.TEXT_INPUT_DEBOUNCE_TIME;
+
+	public ItemTextInput(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+		super(context, attrs, defStyleAttr, defStyleRes);
+	}
+
+	public ItemTextInput(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
+		super(context, attrs, defStyleAttr);
+	}
+
+	public ItemTextInput(@NonNull Context context, @Nullable AttributeSet attrs) {
+		super(context, attrs);
+	}
+
+	public ItemTextInput(@NonNull Context context) {
+		super(context);
+	}
+
+	@Override
+	public void onBindViewHolder(@NonNull PreferenceViewHolder holder) {
+		super.onBindViewHolder(holder);
+		EditText editText = holder.itemView.findViewById(R.id.input_text_input_field);
+		if (editText == null) {
+			Logger.e(getClass().getSimpleName(), "Cannot attach a text change listener. Unable to find the EditText element.");
+		} else {
+			editText.addTextChangedListener(this);
+		}
+	}
+
+	@Override protected int getDefaultLayout() { return R.layout.pref_input_text; }
+	@Override protected int getLargeLayout() { return R.layout.pref_input_text_large; }
+
+	@Override public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
+	@Override public void onTextChanged(CharSequence s, int start, int before, int count) {}
+
+	@Override
+	public void afterTextChanged(Editable s) {
+		if (debounceTime > 0) {
+			debouncer.removeCallbacksAndMessages(null);
+			debouncer.postDelayed(() -> onChange(s.toString()), debounceTime);
+		} else {
+			onChange(s.toString());
+		}
+	}
+
+	protected abstract void onChange(String word);
+}

app/src/main/java/io/github/sspanak/tt9/preferences/screens/deleteWords/DeletableWordsList.java

@@ -41,7 +41,7 @@ class DeletableWordsList {
 	void addNoResult(boolean noSearchTerm) {
 		if (item != null) {
 			Preference pref = new PreferencePlainText(item.getContext());
-			pref.setSummary(noSearchTerm ? "--" : item.getContext().getString(R.string.delete_words_no_result));
+			pref.setSummary(noSearchTerm ? "--" : item.getContext().getString(R.string.search_results_void));
 			item.addPreference(pref);
 		}
 	}

app/src/main/java/io/github/sspanak/tt9/preferences/screens/deleteWords/PreferenceSearchWords.java

@@ -2,24 +2,21 @@ package io.github.sspanak.tt9.preferences.screens.deleteWords;
 
 import android.content.Context;
 import android.util.AttributeSet;
-import android.widget.EditText;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
-import androidx.preference.PreferenceViewHolder;
 
 import java.util.ArrayList;
 
-import io.github.sspanak.tt9.R;
 import io.github.sspanak.tt9.db.WordStoreAsync;
 import io.github.sspanak.tt9.languages.Language;
 import io.github.sspanak.tt9.languages.LanguageCollection;
-import io.github.sspanak.tt9.preferences.custom.ScreenPreference;
+import io.github.sspanak.tt9.preferences.items.ItemTextInput;
 import io.github.sspanak.tt9.preferences.settings.SettingsStore;
 import io.github.sspanak.tt9.util.ConsumerCompat;
 import io.github.sspanak.tt9.util.Logger;
 
-public class PreferenceSearchWords extends ScreenPreference {
+public class PreferenceSearchWords extends ItemTextInput {
 	public static final String NAME = "dictionary_delete_words_search";
 	private static final String LOG_TAG = PreferenceSearchWords.class.getSimpleName();
 
@@ -33,28 +30,6 @@ public class PreferenceSearchWords extends ScreenPreference {
 	public PreferenceSearchWords(@NonNull Context context, @Nullable AttributeSet attrs) { super(context, attrs); }
 	public PreferenceSearchWords(@NonNull Context context) { super(context); }
 
-
-	@Override
-	public void onBindViewHolder(@NonNull PreferenceViewHolder holder) {
-		super.onBindViewHolder(holder);
-		EditText editText = holder.itemView.findViewById(R.id.input_text_input_field);
-		if (editText == null) {
-			Logger.e(LOG_TAG, "Cannot attach a text change listener. Unable to find the EditText element.");
-		} else {
-			editText.addTextChangedListener(TextChangeListener.getInstance(this::onChange));
-		}
-	}
-
-
-	@Override protected int getDefaultLayout() { return R.layout.pref_input_text; }
-	@Override protected int getLargeLayout() { return R.layout.pref_input_text_large; }
-
-
-	@NonNull
-	public String getLastSearchTerm() {
-		return lastSearchTerm;
-	}
-
 	private SettingsStore getSettings() {
 		if (settings == null) {
 			settings = new SettingsStore(getContext());
@@ -64,7 +39,14 @@ public class PreferenceSearchWords extends ScreenPreference {
 	}
 
 
-	private void onChange(String word) {
+	@NonNull
+	public String getLastSearchTerm() {
+		return lastSearchTerm;
+	}
+
+
+	@Override
+	protected void onChange(String word) {
 		lastSearchTerm = word == null || word.trim().isEmpty() ? "" : word.trim();
 
 		if (onWords == null) {

app/src/main/java/io/github/sspanak/tt9/preferences/screens/deleteWords/TextChangeListener.java

@@ -1,39 +0,0 @@
-package io.github.sspanak.tt9.preferences.screens.deleteWords;
-
-import android.os.Handler;
-import android.os.Looper;
-import android.text.Editable;
-import android.text.TextWatcher;
-
-import androidx.annotation.NonNull;
-
-import io.github.sspanak.tt9.preferences.settings.SettingsStore;
-import io.github.sspanak.tt9.util.ConsumerCompat;
-
-class TextChangeListener implements TextWatcher {
-	private static TextChangeListener self;
-
-	@NonNull private ConsumerCompat<String> onChange;
-	@NonNull private final Handler debouncer = new Handler(Looper.getMainLooper());
-
-	private TextChangeListener(@NonNull ConsumerCompat<String> onChange) {
-		this.onChange = onChange;
-	}
-
-	static TextChangeListener getInstance(@NonNull ConsumerCompat<String> onChange) {
-		if (self == null) {
-			self = new TextChangeListener(onChange);
-		}
-
-		self.onChange = onChange;
-		return self;
-	}
-
-	@Override public void afterTextChanged(Editable s) {
-		debouncer.removeCallbacksAndMessages(null);
-		debouncer.postDelayed(() -> onChange.accept(s.toString()), SettingsStore.DELETE_WORDS_SEARCH_DELAY);
-	}
-
-	@Override public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
-	@Override public void onTextChanged(CharSequence s, int start, int before, int count) {}
-}

app/src/main/java/io/github/sspanak/tt9/preferences/screens/languageSelection/LanguageSelectionScreen.java

@@ -0,0 +1,97 @@
+package io.github.sspanak.tt9.preferences.screens.languageSelection;
+
+import androidx.annotation.NonNull;
+import androidx.preference.PreferenceCategory;
+
+import java.util.ArrayList;
+
+import io.github.sspanak.tt9.R;
+import io.github.sspanak.tt9.db.WordStoreAsync;
+import io.github.sspanak.tt9.languages.Language;
+import io.github.sspanak.tt9.languages.LanguageCollection;
+import io.github.sspanak.tt9.languages.NaturalLanguage;
+import io.github.sspanak.tt9.preferences.PreferencesActivity;
+import io.github.sspanak.tt9.preferences.screens.BaseScreenFragment;
+
+public class LanguageSelectionScreen  extends BaseScreenFragment {
+	public static final String NAME = "LanguageSelection";
+
+	private PreferenceCategory languagesCategory;
+
+	public LanguageSelectionScreen() { init(); }
+	public LanguageSelectionScreen(PreferencesActivity activity) { init(activity); }
+
+
+	@Override public String getName() { return NAME; }
+	@Override protected int getTitle() { return R.string.language_selection_title; }
+	@Override protected int getXml() { return R.xml.prefs_screen_language_selection; }
+
+
+	@Override
+	protected void onCreate() {
+		createLanguageList();
+		enableFiltering();
+		resetFontSize(false);
+	}
+
+
+	private void createLanguageList() {
+		languagesCategory = findPreference("language_list");
+		if (languagesCategory == null) {
+			return;
+		}
+
+		ArrayList<Language> allLanguages = LanguageCollection.getAll(activity, true);
+		if (allLanguages.isEmpty()) {
+			return;
+		}
+
+		addLanguagesToCategory(languagesCategory, allLanguages);
+		WordStoreAsync.exists(this::addLoadedStatus, allLanguages);
+	}
+
+
+	private void addLanguagesToCategory(@NonNull PreferenceCategory category, ArrayList<Language> allLanguages) {
+		ArrayList<Integer> enabledLanguageIds = activity.getSettings().getEnabledLanguageIds();
+
+		PreferenceSwitchLanguage.clearItems();
+
+		for (Language language : allLanguages) {
+			if (language instanceof NaturalLanguage) {
+				PreferenceSwitchLanguage item = new PreferenceSwitchLanguage(activity, (NaturalLanguage) language);
+				category.addPreference(item);
+
+				// Inflating sometimes resets the checked state to false for some reason.
+				// This is why we have to set it at the end.
+				// https://stackoverflow.com/q/42951557
+				item.setChecked(enabledLanguageIds.contains(language.getId()));
+			}
+		}
+	}
+
+
+	private void addLoadedStatus(ArrayList<Integer> enabledLanguageIds) {
+		if (languagesCategory == null) {
+			return;
+		}
+
+		activity.runOnUiThread(() -> {
+			for (int languageId : enabledLanguageIds) {
+				PreferenceSwitchLanguage item = languagesCategory.findPreference(PreferenceSwitchLanguage.KEY_PREFIX + languageId);
+				if (item != null) {
+					item.setLoaded();
+				}
+			}
+		});
+	}
+
+
+	private void enableFiltering() {
+		PreferenceSearchLanguage search = findPreference("language_search");
+		if (search != null) {
+			search
+				.setLanguageItems(PreferenceSwitchLanguage.getItems())
+				.setNoResultItem(findPreference("language_search_no_result"));
+		}
+	}
+}

app/src/main/java/io/github/sspanak/tt9/preferences/screens/languageSelection/PreferenceSearchLanguage.java

@@ -0,0 +1,71 @@
+package io.github.sspanak.tt9.preferences.screens.languageSelection;
+
+import android.content.Context;
+import android.util.AttributeSet;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.preference.Preference;
+
+import java.util.ArrayList;
+
+import io.github.sspanak.tt9.preferences.items.ItemTextInput;
+import io.github.sspanak.tt9.util.Logger;
+
+public class PreferenceSearchLanguage extends ItemTextInput {
+	@NonNull private ArrayList<PreferenceSwitchLanguage> languageItems = new ArrayList<>();
+	private Preference noResultItem;
+
+	public PreferenceSearchLanguage(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+		super(context, attrs, defStyleAttr, defStyleRes);
+	}
+
+	public PreferenceSearchLanguage(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
+		super(context, attrs, defStyleAttr);
+	}
+
+	public PreferenceSearchLanguage(@NonNull Context context, @Nullable AttributeSet attrs) {
+		super(context, attrs);
+	}
+
+	public PreferenceSearchLanguage(@NonNull Context context) {
+		super(context);
+	}
+
+	private void showNoResultItem(boolean show) {
+		if (noResultItem != null) {
+			noResultItem.setVisible(show);
+		}
+	}
+
+	@Override
+	protected void onChange(String word) {
+		word = word == null ? "" : word.trim();
+
+		int visibleLanguages = languageItems.size();
+		for (PreferenceSwitchLanguage languageItem : languageItems) {
+			CharSequence title = languageItem.getTitle() == null ? "" : languageItem.getTitle();
+			CharSequence summary = languageItem.getSummary() == null ? "" : languageItem.getSummary();
+
+			languageItem.setVisible(
+				title.toString().toLowerCase().startsWith(word.toLowerCase()) ||
+				summary.toString().toLowerCase().startsWith(word.toLowerCase())
+			);
+
+			if (!languageItem.isVisible()) {
+				visibleLanguages--;
+			}
+		}
+
+		showNoResultItem(visibleLanguages == 0);
+	}
+
+	PreferenceSearchLanguage setLanguageItems(@NonNull ArrayList<PreferenceSwitchLanguage> languageItems) {
+		this.languageItems = languageItems;
+		return this;
+	}
+
+	void setNoResultItem(Preference noResultItem) {
+		this.noResultItem = noResultItem;
+	}
+}

app/src/main/java/io/github/sspanak/tt9/preferences/screens/languageSelection/PreferenceSwitchLanguage.java

@@ -0,0 +1,106 @@
+package io.github.sspanak.tt9.preferences.screens.languageSelection;
+
+import android.app.Activity;
+import android.content.Context;
+
+import androidx.annotation.NonNull;
+import androidx.preference.Preference;
+import androidx.preference.SwitchPreferenceCompat;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.Set;
+
+import io.github.sspanak.tt9.BuildConfig;
+import io.github.sspanak.tt9.R;
+import io.github.sspanak.tt9.db.entities.WordFile;
+import io.github.sspanak.tt9.languages.NaturalLanguage;
+import io.github.sspanak.tt9.preferences.PreferencesActivity;
+import io.github.sspanak.tt9.preferences.settings.SettingsStore;
+
+public class PreferenceSwitchLanguage extends SwitchPreferenceCompat {
+	public static final String KEY_PREFIX = "language_";
+
+	private static final ArrayList<PreferenceSwitchLanguage> items = new ArrayList<>();
+
+	public PreferenceSwitchLanguage(@NonNull PreferencesActivity activity, @NonNull NaturalLanguage language) {
+		super(activity);
+
+		setKey(KEY_PREFIX + language.getId());
+		setTitle(language.getName());
+		setSummary(generateSummary(activity, language));
+		setOnPreferenceChangeListener(PreferenceSwitchLanguage::handleChange);
+		items.add(this);
+	}
+
+
+	static void clearItems() {
+		items.clear();
+	}
+
+	static ArrayList<PreferenceSwitchLanguage> getItems() {
+		return new ArrayList<>(items);
+	}
+
+
+	private String generateSummary(Activity activity, NaturalLanguage language) {
+		String summary = language.getLocale().getDisplayLanguage();
+
+		String wordsString = activity.getString(R.string.language_selection_words);
+		WordFile wordFile = new WordFile(activity, language.getDictionaryFile(), activity.getAssets());
+		if (wordFile.getTotalLines() > 1000000) {
+			summary += String.format(", %1.2fM %s", wordFile.getTotalLines() / 1000000.0, wordsString);
+		} else {
+			summary += ", " + wordFile.getTotalLines() / 1000 + "k " + wordsString;
+		}
+
+		if (BuildConfig.LITE) {
+			summary += String.format(", %1.2f Mb", wordFile.getSize() / 1048576.0);
+		}
+
+		return summary;
+	}
+
+
+	private String getLanguageId() {
+		return getKey().substring(KEY_PREFIX.length());
+	}
+
+
+	private static boolean handleChange(Preference p, Object newValue) {
+		SettingsStore settings = ((PreferencesActivity) p.getContext()).getSettings();
+		String languageSettingsId = ((PreferenceSwitchLanguage) p).getLanguageId();
+
+		Set<String> enabledLanguages = new HashSet<>();
+
+		for (PreferenceSwitchLanguage item : items) {
+			if (item.isChecked()) {
+				enabledLanguages.add(item.getLanguageId());
+			}
+		}
+
+		if ((boolean) newValue) {
+			enabledLanguages.add(languageSettingsId);
+		} else {
+			enabledLanguages.remove(languageSettingsId);
+		}
+
+		settings.saveEnabledLanguageIds(enabledLanguages);
+
+		return true;
+	}
+
+
+	void setLoaded() {
+		Context context = getContext();
+
+		String summary = getSummary() != null ? getSummary().toString() : null;
+		if (summary == null) {
+			return;
+		}
+
+		summary += " " + context.getString(R.string.language_selection_language_loaded);
+
+		setSummary(summary);
+	}
+}

app/src/main/java/io/github/sspanak/tt9/preferences/screens/languages/ItemSelectLanguage.java

@@ -1,80 +1,32 @@
 package io.github.sspanak.tt9.preferences.screens.languages;
 
-import androidx.preference.MultiSelectListPreference;
+import androidx.preference.Preference;
 
-import java.util.ArrayList;
-import java.util.HashSet;
-
-import io.github.sspanak.tt9.R;
-import io.github.sspanak.tt9.languages.Language;
 import io.github.sspanak.tt9.languages.LanguageCollection;
 import io.github.sspanak.tt9.preferences.PreferencesActivity;
-import io.github.sspanak.tt9.ui.UI;
 
 class ItemSelectLanguage {
 	public static final String NAME = "pref_languages";
 
 	private final PreferencesActivity activity;
-	private final MultiSelectListPreference item;
+	private final Preference item;
 
-	ItemSelectLanguage(PreferencesActivity activity, MultiSelectListPreference multiSelect) {
+	ItemSelectLanguage(PreferencesActivity activity, Preference item) {
 		this.activity = activity;
-		this.item = multiSelect;
+		this.item = item;
 	}
 
 	public ItemSelectLanguage populate() {
-		if (item == null) {
-			return this;
-		}
-
-		ArrayList<Language> languages = LanguageCollection.getAll(activity, true);
-		if (languages.isEmpty()) {
-			UI.alert(activity, R.string.error, R.string.failed_loading_language_definitions);
-			// do not return, the MultiSelect component requires arrays, even if empty, otherwise it crashes
-		}
-
-		ArrayList<CharSequence> values = new ArrayList<>();
-		for (Language l : languages) {
-			values.add(String.valueOf(l.getId()));
-		}
-
-		ArrayList<String> keys = new ArrayList<>();
-		for (Language l : languages) {
-			keys.add(l.getName());
-		}
-
-		item.setEntries(keys.toArray(new CharSequence[0]));
-		item.setEntryValues(values.toArray(new CharSequence[0]));
-		item.setValues(activity.getSettings().getEnabledLanguagesIdsAsStrings());
 		previewSelection();
-
 		return this;
 	}
 
 
-	public void enableValidation() {
-		if (item == null) {
-			return;
-		}
-
-		item.setOnPreferenceChangeListener((preference, newValue) -> {
-			@SuppressWarnings("unchecked") HashSet<String> newLanguages = (HashSet<String>) newValue;
-			if (newLanguages.isEmpty()) {
-				newLanguages.add("1");
-			}
-
-			activity.getSettings().saveEnabledLanguageIds(newLanguages);
-			item.setValues(activity.getSettings().getEnabledLanguagesIdsAsStrings());
-			previewSelection();
-
-			// we validate and save manually above, so "false" disables automatic save
-			return false;
-		});
-
-	}
-
-
 	private void previewSelection() {
+		if (item == null) {
+			return;
+		}
+
 		item.setSummary(
 			LanguageCollection.toString(LanguageCollection.getAll(activity, activity.getSettings().getEnabledLanguageIds(), true))
 		);

app/src/main/java/io/github/sspanak/tt9/preferences/screens/languages/LanguagesScreen.java

@@ -36,11 +36,7 @@ public class LanguagesScreen extends BaseScreenFragment {
 
 	@Override
 	protected void onCreate() {
-		ItemSelectLanguage multiSelect = new ItemSelectLanguage(
+		new ItemSelectLanguage(activity, findPreference(ItemSelectLanguage.NAME)).populate();
-			activity,
-			findPreference(ItemSelectLanguage.NAME)
-		);
-		multiSelect.populate().enableValidation();
 
 		new ItemDictionaryNotifications(findPreference(ItemDictionaryNotifications.NAME), activity)
 			.populate()
@@ -111,6 +107,7 @@ public class LanguagesScreen extends BaseScreenFragment {
 
 
 	private void refreshItems() {
+		new ItemSelectLanguage(activity, findPreference(ItemSelectLanguage.NAME)).populate();
 		loadItem.refreshStatus();
 		exportDictionaryItem.refreshStatus();
 		exportCustomWordsItem.refreshStatus();

app/src/main/java/io/github/sspanak/tt9/preferences/settings/SettingsInput.java

@@ -39,9 +39,11 @@ class SettingsInput extends SettingsHotkeys {
 
 
 	public Set<String> getEnabledLanguagesIdsAsStrings() {
-		return prefs.getStringSet("pref_languages", new HashSet<>(Collections.singletonList(
+		Set<String> defaultLanguages =  new HashSet<>(Collections.singletonList(
 			String.valueOf(LanguageCollection.getDefault(context).getId())
-		)));
+		));
+
+		return new HashSet<>(prefs.getStringSet("pref_languages", defaultLanguages));
 	}
 
 

app/src/main/java/io/github/sspanak/tt9/preferences/settings/SettingsStore.java

@@ -8,7 +8,6 @@ public class SettingsStore extends SettingsUI {
 
 	/************* internal settings *************/
 	public final static int CLIPBOARD_PREVIEW_LENGTH = 20;
-	public final static int DELETE_WORDS_SEARCH_DELAY = 500; // ms
 	public final static int CUSTOM_WORDS_IMPORT_MAX_LINES = 250;
 	public final static int CUSTOM_WORDS_MAX = 1000;
 	public final static int DICTIONARY_AUTO_LOAD_COOLDOWN_TIME = 1200000; // 20 minutes in ms
@@ -28,6 +27,7 @@ public class SettingsStore extends SettingsUI {
 	public final static int SUGGESTIONS_MIN = 8;
 	public final static int SUGGESTIONS_SELECT_ANIMATION_DURATION = 66;
 	public final static int SUGGESTIONS_TRANSLATE_ANIMATION_DURATION = 0;
+	public final static int TEXT_INPUT_DEBOUNCE_TIME = 500; // ms
 	public final static int WORD_FREQUENCY_MAX = 25500;
 	public final static int WORD_FREQUENCY_NORMALIZATION_DIVIDER = 100; // normalized frequency = WORD_FREQUENCY_MAX / WORD_FREQUENCY_NORMALIZATION_DIVIDER
 	public final static int WORD_NORMALIZATION_DELAY = 15000; // ms

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

@@ -64,8 +64,8 @@
 	<string name="delete_words_delete">Изтрий</string>
 	<string name="delete_words_link_summary">Намери и изтрий на неправилно написани или ненужни думи.</string>
 	<string name="delete_words_search_placeholder">Търси думи</string>
-	<string name="delete_words_list">Намерени думи</string>
+	<string name="search_results">Намерени думи</string>
-	<string name="delete_words_no_result">Няма резултати.</string>
+	<string name="search_results_void">Няма резултати.</string>
 	<string name="delete_words_deleted_confirm_deletion_title">Потвърдете изтриването</string>
 	<string name="delete_words_deleted_confirm_deletion_question">Наистина ли искате да изтриете „%1$s“?</string>
 	<string name="delete_words_deleted_x">„%1$s“ беше изтрита.</string>
@@ -165,4 +165,8 @@
 	<string name="dictionary_import_custom_words_summary">Импортиране на думи от по-рано експортирано CSV.</string>
 	<string name="dictionary_import_progress">Импортиране на CSV (%1$s)…</string>
 	<string name="dictionary_import_running">Импортиране на CSV…</string>
+	<string name="language_selection_language_loaded">(зареден)</string>
+	<string name="language_selection_title">Избор на езици</string>
+	<string name="language_selection_search_placeholder">Търси езици</string>
+	<string name="language_selection_words">думи</string>
 </resources>

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

@@ -102,8 +102,8 @@
 	<string name="delete_words_delete">Löschen</string>
 	<string name="delete_words_link_summary">Finde und lösche falsch geschriebene oder überflüssige Wörter.</string>
 	<string name="delete_words_search_placeholder">Nach Wörtern suchen</string>
-	<string name="delete_words_list">Suchergebnisse</string>
+	<string name="search_results">Suchergebnisse</string>
-	<string name="delete_words_no_result">Keine Ergebnisse.</string>
+	<string name="search_results_void">Keine Ergebnisse.</string>
 	<string name="delete_words_deleted_confirm_deletion_title">Löschung bestätigen</string>
 	<string name="delete_words_deleted_confirm_deletion_question">Sind Sie sicher, dass Sie \"%1$s\" löschen möchten?</string>
 	<string name="delete_words_deleted_x">\"%1$s\" wurde gelöscht.</string>
@@ -154,4 +154,8 @@
 	<string name="dictionary_import_custom_words_summary">Wörter aus einer zuvor exportierten CSV-Datei importieren.</string>
 	<string name="dictionary_import_progress">CSV importieren (%1$s)…</string>
 	<string name="dictionary_import_running">CSV importieren…</string>
+	<string name="language_selection_language_loaded">(geladen)</string>
+	<string name="language_selection_title">Sprachen aktivieren</string>
+	<string name="language_selection_search_placeholder">Nach Sprachen suchen</string>
+	<string name="language_selection_words">Wörter</string>
 </resources>

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

@@ -115,8 +115,8 @@
 	<string name="delete_words_delete">Eliminar</string>
 	<string name="delete_words_link_summary">Buscar y eliminar palabras mal escritas o innecesarias.</string>
 	<string name="delete_words_search_placeholder">Buscar palabras</string>
-	<string name="delete_words_list">Palabras encontradas</string>
+	<string name="search_results">Palabras encontradas</string>
-	<string name="delete_words_no_result">Sin resultados.</string>
+	<string name="search_results_void">Sin resultados.</string>
 	<string name="delete_words_deleted_confirm_deletion_title">Confirma la eliminación</string>
 	<string name="delete_words_deleted_confirm_deletion_question">¿Estás seguro de que quieres eliminar \"%1$s\"?</string>
 	<string name="delete_words_deleted_x">\"%1$s\" fue eliminada.</string>
@@ -163,4 +163,8 @@
 	<string name="dictionary_import_custom_words_summary">Importar palabras de un CSV previamente exportado.</string>
 	<string name="dictionary_import_progress">Importando CSV (%1$s)…</string>
 	<string name="dictionary_import_running">Importando CSV…</string>
+	<string name="language_selection_language_loaded">(cargado)</string>
+	<string name="language_selection_title">Habilitar idiomas</string>
+	<string name="language_selection_search_placeholder">Buscar idiomas</string>
+	<string name="language_selection_words">palabras</string>
 </resources>

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

@@ -117,8 +117,8 @@
 	<string name="delete_words_delete">Supprimer</string>
 	<string name="delete_words_link_summary">Trouver et supprimer des mots mal orthographiés ou inutiles.</string>
 	<string name="delete_words_search_placeholder">Rechercher des mots</string>
-	<string name="delete_words_list">Mots trouvés</string>
+	<string name="search_results">Mots trouvés</string>
-	<string name="delete_words_no_result">Aucun résultat.</string>
+	<string name="search_results_void">Aucun résultat.</string>
 	<string name="delete_words_deleted_confirm_deletion_title">Confirmer la suppression</string>
 	<string name="delete_words_deleted_confirm_deletion_question">Êtes-vous sûr de vouloir supprimer « %1$s » ?</string>
 	<string name="delete_words_deleted_x">\"%1$s\" a été supprimé.</string>
@@ -161,4 +161,8 @@
 	<string name="dictionary_import_custom_words_summary">Importer des mots à partir d\'un fichier CSV précédemment exporté.</string>
 	<string name="dictionary_import_progress">Importation de CSV (%1$s)…</string>
 	<string name="dictionary_import_running">Importation de CSV…</string>
+	<string name="language_selection_language_loaded">(chargée)</string>
+	<string name="language_selection_title">Activer les langues</string>
+	<string name="language_selection_search_placeholder">Rechercher des langues</string>
+	<string name="language_selection_words">mots</string>
 </resources>

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

@@ -102,8 +102,8 @@
 	<string name="delete_words_delete">Elimina</string>
 	<string name="delete_words_link_summary">Trova ed elimina parole errate o non necessarie.</string>
 	<string name="delete_words_search_placeholder">Ricerca di parole</string>
-	<string name="delete_words_list">Parole trovate</string>
+	<string name="search_results">Parole trovate</string>
-	<string name="delete_words_no_result">Nessun risultato.</string>
+	<string name="search_results_void">Nessun risultato.</string>
 	<string name="delete_words_deleted_confirm_deletion_title">Conferma l\'eliminazione</string>
 	<string name="delete_words_deleted_confirm_deletion_question">Sei sicuro di voler eliminare \"%1$s\"?</string>
 	<string name="delete_words_deleted_x">\"%1$s\" è stata eliminata.</string>
@@ -153,5 +153,9 @@
 	<string name="dictionary_import_custom_words_summary">Importare parole da un CSV precedentemente esportato.</string>
 	<string name="dictionary_import_progress">Importazione CSV (%1$s)…</string>
 	<string name="dictionary_import_running">Importazione CSV…</string>
+	<string name="language_selection_language_loaded">(caricata)</string>
+	<string name="language_selection_title">Abilita lingue</string>
+	<string name="language_selection_search_placeholder">Cerca lingue</string>
+	<string name="language_selection_words">parole</string>
 </resources>
 

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

@@ -115,8 +115,8 @@
 	<string name="delete_words_delete">מחיקה</string>
 	<string name="delete_words_link_summary">מצא ומחק מילים שכתובות בטעות או שאינן נדרשות.</string>
 	<string name="delete_words_search_placeholder">חיפוש מילים</string>
-	<string name="delete_words_list">תוצאות חיפוש</string>
+	<string name="search_results">תוצאות חיפוש</string>
-	<string name="delete_words_no_result">אין תוצאות.</string>
+	<string name="search_results_void">אין תוצאות.</string>
 	<string name="delete_words_deleted_confirm_deletion_title">אישור מחיקה</string>
 	<string name="delete_words_deleted_confirm_deletion_question">האם אתה בטוח שברצונך להסיר את \"%1$s\"?</string>
 	<string name="delete_words_deleted_x">\"%1$s\" נמחקה.</string>
@@ -166,4 +166,8 @@
 	<string name="dictionary_import_custom_words_summary">ייבוא מילים מקובץ CSV שיוצא קודם לכן.</string>
 	<string name="dictionary_import_progress">מייבא CSV (%1$s)…</string>
 	<string name="dictionary_import_running">מייבא CSV…</string>
+	<string name="language_selection_language_loaded">(נטען)</string>
+	<string name="language_selection_title">הפעל שפות</string>
+	<string name="language_selection_search_placeholder">חיפוש שפות</string>
+	<string name="language_selection_words">מילים</string>
 </resources>

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

@@ -134,8 +134,8 @@
 	<string name="delete_words_delete">Ištrinti</string>
 	<string name="delete_words_link_summary">Raskite ir ištrinkite neteisingai parašytus arba nereikalingus žodžius.</string>
 	<string name="delete_words_search_placeholder">Ieškoti žodžių</string>
-	<string name="delete_words_list">Paieškos rezultatai</string>
+	<string name="search_results">Paieškos rezultatai</string>
-	<string name="delete_words_no_result">Jokių rezultatų.</string>
+	<string name="search_results_void">Jokių rezultatų.</string>
 	<string name="delete_words_deleted_confirm_deletion_title">Patvirtinkite ištrynimą</string>
 	<string name="delete_words_deleted_confirm_deletion_question">Ar tikrai norite ištrinti „%1$s“?</string>
 	<string name="delete_words_deleted_x">„%1$s“ buvo ištrintas.</string>
@@ -172,4 +172,8 @@
 	<string name="dictionary_import_custom_words_summary">Importuoti žodžius iš anksčiau eksportuoto CSV.</string>
 	<string name="dictionary_import_progress">Importuojamas CSV (%1$s)…</string>
 	<string name="dictionary_import_running">Importuojamas CSV…</string>
+	<string name="language_selection_language_loaded">(įkelta)</string>
+	<string name="language_selection_title">Įjungti kalbas</string>
+	<string name="language_selection_search_placeholder">Ieškoti kalbų</string>
+	<string name="language_selection_words">žodžių</string>
 </resources>

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

@@ -100,8 +100,8 @@
 	<string name="delete_words_delete">Verwijderen</string>
 	<string name="delete_words_link_summary">Zoek en verwijder verkeerd gespelde of onnodige woorden.</string>
 	<string name="delete_words_search_placeholder">Zoeken naar woorden</string>
-	<string name="delete_words_list">Zoekresultaten</string>
+	<string name="search_results">Zoekresultaten</string>
-	<string name="delete_words_no_result">Geen resultaten.</string>
+	<string name="search_results_void">Geen resultaten.</string>
 	<string name="delete_words_deleted_confirm_deletion_title">Bevestig verwijdering</string>
 	<string name="delete_words_deleted_confirm_deletion_question">Weet u zeker dat u \"%1$s\" wilt verwijderen?</string>
 	<string name="delete_words_deleted_x">\"%1$s\" is verwijderd.</string>
@@ -152,4 +152,8 @@
 	<string name="dictionary_import_custom_words_summary">Woorden importeren uit een eerder geëxporteerde CSV.</string>
 	<string name="dictionary_import_progress">CSV importeren (%1$s)…</string>
 	<string name="dictionary_import_running">CSV importeren…</string>
+	<string name="language_selection_language_loaded">(geladen)</string>
+	<string name="language_selection_title">Talen inschakelen</string>
+	<string name="language_selection_search_placeholder">Zoeken naar talen</string>
+	<string name="language_selection_words">woorden</string>
 </resources>

app/src/main/res/values-pt-rBR/strings.xml

@@ -115,8 +115,8 @@
 	<string name="delete_words_delete">Excluir</string>
 	<string name="delete_words_link_summary">Encontrar e excluir palavras escritas incorretamente ou desnecessárias.</string>
 	<string name="delete_words_search_placeholder">Buscar palavras</string>
-	<string name="delete_words_list">Palavras encontradas</string>
+	<string name="search_results">Palavras encontradas</string>
-	<string name="delete_words_no_result">Sem resultados.</string>
+	<string name="search_results_void">Sem resultados.</string>
 	<string name="delete_words_deleted_confirm_deletion_title">Confirme a exclusão</string>
 	<string name="delete_words_deleted_confirm_deletion_question">Tem certeza de que deseja excluir \"%1$s\"?</string>
 	<string name="delete_words_deleted_x">\"%1$s\" foi excluída.</string>
@@ -166,4 +166,8 @@
 	<string name="dictionary_import_custom_words_summary">Importar palavras de um CSV previamente exportado.</string>
 	<string name="dictionary_import_progress">Importando CSV (%1$s)…</string>
 	<string name="dictionary_import_running">Importando CSV…</string>
+	<string name="language_selection_language_loaded">(carregado)</string>
+	<string name="language_selection_title">Habilitar idiomas</string>
+	<string name="language_selection_search_placeholder">Buscar por idiomas</string>
+	<string name="language_selection_words">palavras</string>
 </resources>

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

@@ -116,8 +116,8 @@
 	<string name="delete_words_delete">Удалить</string>
 	<string name="delete_words_link_summary">Найти и удалить ошибочно написанные или ненужные слова.</string>
 	<string name="delete_words_search_placeholder">Поиск слов</string>
-	<string name="delete_words_list">Найденные слова</string>
+	<string name="search_results">Найденные слова</string>
-	<string name="delete_words_no_result">Нет результатов.</string>
+	<string name="search_results_void">Нет результатов.</string>
 	<string name="delete_words_deleted_confirm_deletion_title">Подтвердите удаление</string>
 	<string name="delete_words_deleted_confirm_deletion_question">Уверены, что хотите удалить «%1$s»?</string>
 	<string name="delete_words_deleted_x">\"%1$s\" было удалено.</string>
@@ -163,4 +163,8 @@
 	<string name="dictionary_import_custom_words_summary">Импортировать слова из ранее экспортированного CSV.</string>
 	<string name="dictionary_import_progress">Импортирование CSV (%1$s)…</string>
 	<string name="dictionary_import_running">Импортирование CSV…</string>
+	<string name="language_selection_language_loaded">(загружен)</string>
+	<string name="language_selection_title">Включить языки</string>
+	<string name="language_selection_search_placeholder">Поиск языков</string>
+	<string name="language_selection_words">слов</string>
 </resources>

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

@@ -100,8 +100,8 @@
 	<string name="delete_words_delete">Sil</string>
 	<string name="delete_words_link_summary">Yanlış yazılan ya da gereksiz kelimeleri bulun ve silin.</string>
 	<string name="delete_words_search_placeholder">Aramak istediğiniz kelimeyi yazın…</string>
-	<string name="delete_words_list">Ara</string>
+	<string name="search_results">Ara</string>
-	<string name="delete_words_no_result">Eşleşme bulunamadı.</string>
+	<string name="search_results_void">Eşleşme bulunamadı.</string>
 	<string name="delete_words_deleted_confirm_deletion_title">Silmeyi Onayla</string>
 	<string name="delete_words_deleted_confirm_deletion_question">\"%1$s\" kelimesini silmeyi onaylıyor musunuz?</string>
 	<string name="delete_words_deleted_x">\"%1$s\" kelimesi başarıyla silindi.</string>
@@ -166,4 +166,8 @@
 	<string name="dictionary_import_custom_words_summary">Daha önce dışa aktarılan bir CSV\'den kelimeleri içe aktar.</string>
 	<string name="dictionary_import_progress">CSV İçe aktarılıyor (%1$s)…</string>
 	<string name="dictionary_import_running">CSV İçe aktarılıyor…</string>
+	<string name="language_selection_language_loaded">(yüklendi)</string>
+	<string name="language_selection_title">Dilleri etkinleştir</string>
+	<string name="language_selection_search_placeholder">Diller için arama</string>
+	<string name="language_selection_words">kelime</string>
 </resources>

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

@@ -99,8 +99,8 @@
 	<string name="delete_words_delete">Видалити</string>
 	<string name="delete_words_link_summary">Знайти та видалити неправильно написані або зайві слова.</string>
 	<string name="delete_words_search_placeholder">Пошук слів</string>
-	<string name="delete_words_list">Знайдені слова</string>
+	<string name="search_results">Знайдені слова</string>
-	<string name="delete_words_no_result">Немає результатів.</string>
+	<string name="search_results_void">Немає результатів.</string>
 	<string name="delete_words_deleted_confirm_deletion_title">Підтвердіть видалення</string>
 	<string name="delete_words_deleted_confirm_deletion_question">Ви впевнені, що хочете видалити \"%1$s\"?</string>
 	<string name="delete_words_deleted_x">\"%1$s\" було видалено.</string>
@@ -174,4 +174,8 @@
 	<string name="dictionary_import_custom_words_summary">Імпортувати слова з раніше експортованого CSV.</string>
 	<string name="dictionary_import_progress">Імпорт CSV (%1$s)…</string>
 	<string name="dictionary_import_running">Імпорт CSV…</string>
+	<string name="language_selection_language_loaded">(завантажено)</string>
+	<string name="language_selection_title">Увімкнути мови</string>
+	<string name="language_selection_search_placeholder">Пошук мов</string>
+	<string name="language_selection_words">слів</string>
 </resources>

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

@@ -8,6 +8,8 @@
 	<string name="error">Error</string>
 	<string name="loading">Loading…</string>
 	<string name="no_language">No Language</string>
+	<string name="search_results">Search Results</string>
+	<string name="search_results_void">No results.</string>
 
 	<string name="error_unexpected">Unexpected error occurred.</string>
 	<string name="failed_loading_language_definitions">Failed loading all language definitions.</string>
@@ -125,8 +127,6 @@
 	<string name="delete_words_delete">Delete</string>
 	<string name="delete_words_link_summary">Find and delete misspelled or unneeded words.</string>
 	<string name="delete_words_search_placeholder">Search for Words</string>
-	<string name="delete_words_list">Search Results</string>
-	<string name="delete_words_no_result">No results.</string>
 	<string name="delete_words_deleted_confirm_deletion_title">Confirm Deletion</string>
 	<string name="delete_words_deleted_confirm_deletion_question">Are you sure you want to delete \"%1$s\"?</string>
 	<string name="delete_words_deleted_x">\"%1$s\" was deleted.</string>
@@ -155,6 +155,12 @@
 	<string name="function_reset_keys_title">Restore Default Keys</string>
 	<string name="function_reset_keys_done">Default key settings restored.</string>
 
+	<string name="language_selection_language_loaded">(loaded)</string>
+	<string name="language_selection_title">Enable Languages</string>
+	<string name="language_selection_search_placeholder">Search for Languages</string>
+	<string name="language_selection_words">words</string>
+
+
 	<string name="setup_keyboard_status">Status</string>
 	<string name="setup_default_keyboard">Select Default Keyboard</string>
 	<string name="setup_tt9_on">%1$s is enabled</string>

app/src/main/res/xml/prefs_screen_delete_words.xml

@@ -7,5 +7,5 @@
 
 	<PreferenceCategory
 		android:key="delete_words_list"
-		android:title="@string/delete_words_list" />
+		android:title="@string/search_results" />
 </PreferenceScreen>

app/src/main/res/xml/prefs_screen_language_selection.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.preference.PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:app="http://schemas.android.com/apk/res-auto">
+	<io.github.sspanak.tt9.preferences.screens.languageSelection.PreferenceSearchLanguage
+		android:key="language_search"
+		android:title="@string/language_selection_search_placeholder" />
+
+	<PreferenceCategory
+		android:key="language_list"
+		android:persistent="false"
+		android:title="@string/language_selection_title"/>
+
+	<io.github.sspanak.tt9.preferences.custom.PreferencePlainText
+		android:key="language_search_no_result"
+		android:summary="@string/search_results_void"
+		app:isPreferenceVisible="false" />
+</androidx.preference.PreferenceScreen>

app/src/main/res/xml/prefs_screen_languages.xml

@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <PreferenceScreen xmlns:app="http://schemas.android.com/apk/res-auto" app:orderingFromXml="true">
 
-	<MultiSelectListPreference
+	<Preference
+		app:fragment="io.github.sspanak.tt9.preferences.screens.languageSelection.LanguageSelectionScreen"
 		app:key="pref_languages"
 		app:title="@string/pref_choose_languages" />