it is now possible to hide an entire Fn column

app/src/main/java/io/github/sspanak/tt9/preferences/screens/fnKeyOrder/FnKeyOrderValidator.java

@@ -46,7 +46,7 @@ public class FnKeyOrderValidator {
 
 
 	private boolean validateLength(String text, int side) {
-		if (text == null || text.length() != 4) {
+		if (text == null || text.length() > 4) {
 			error = R.string.fn_key_order_error_wrong_key_count;
 			errorSide = side;
 			return false;
@@ -57,7 +57,7 @@ public class FnKeyOrderValidator {
 
 
 	private boolean validateDigits(String text, int side) {
-		if (text == null || !text.matches("^[1-8]+$")) {
+		if (text == null || !text.matches("^[1-8]*$")) {
 			error = R.string.fn_key_order_error_unsupported_key_code;
 			errorSide = side;
 			return false;

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

@@ -3,6 +3,8 @@ package io.github.sspanak.tt9.preferences.settings;
 import android.content.Context;
 import android.util.TypedValue;
 
+import androidx.annotation.NonNull;
+
 import java.util.HashMap;
 
 import io.github.sspanak.tt9.R;
@@ -35,11 +37,11 @@ public class SettingsVirtualNumpad extends SettingsUI {
 		return !prefs.getBoolean("pref_arrow_keys_visible", true);
 	}
 
-	public String getLfnKeyOrder() {
+	@NonNull public String getLfnKeyOrder() {
 		return prefs.getString("pref_lfn_key_order", DEFAULT_LFN_KEY_ORDER);
 	}
 
-	public String getRfnKeyOrder() {
+	@NonNull public String getRfnKeyOrder() {
 		return prefs.getString("pref_rfn_key_order", DEFAULT_RFN_KEY_ORDER);
 	}
 

app/src/main/java/io/github/sspanak/tt9/ui/main/BaseMainLayout.java

@@ -11,6 +11,7 @@ import android.view.WindowInsets;
 import android.widget.LinearLayout;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 import androidx.annotation.RequiresApi;
 import androidx.core.view.WindowInsetsCompat;
 
@@ -39,6 +40,24 @@ abstract class BaseMainLayout {
 	}
 
 
+	protected void addKey(int keyId, @Nullable ViewGroup container) {
+		View source = container != null ? container : view;
+		if (source == null) {
+			return;
+		}
+
+		SoftKey key = source.findViewById(keyId);
+		if (key != null) {
+			keys.add(key);
+		}
+	}
+
+
+	protected void addKey(int keyId) {
+		addKey(keyId, null);
+	}
+
+
 	/**
 	 * getKeys
 	 * Returns a list of all the usable Soft Keys. Useful for attaching click handlers and changing

app/src/main/java/io/github/sspanak/tt9/ui/main/MainLayoutNumpad.java

@@ -116,9 +116,8 @@ class MainLayoutNumpad extends BaseMainLayout {
 	 * This prevents Android from auto-closing the keyboard in some apps that have a lot of content.
 	 * Returns the adjusted height of a single key.
 	 */
-	private int calculateKeyHeight() {
+	private int[] calculateKeyHeight() {
-		int keyHeight = tt9.getSettings().getNumpadKeyHeight();
+		final boolean isLandscape = DeviceInfo.isLandscapeOrientation(tt9.getApplicationContext());
-		boolean isLandscape = DeviceInfo.isLandscapeOrientation(tt9.getApplicationContext());
 
 		int bottomPadding = 0;
 		if (DeviceInfo.AT_LEAST_ANDROID_15) {
@@ -126,21 +125,42 @@ class MainLayoutNumpad extends BaseMainLayout {
 			bottomPadding = bottomPadding < 0 ? DeviceInfo.getNavigationBarHeight(tt9.getApplicationContext(), tt9.getSettings(), isLandscape) : bottomPadding;
 		}
 
-		int screenHeight = DeviceInfo.getScreenHeight(tt9.getApplicationContext()) - bottomPadding;
+		final int screenHeight = DeviceInfo.getScreenHeight(tt9.getApplicationContext()) - bottomPadding;
-		double maxScreenHeight = isLandscape ? screenHeight * 0.6 : screenHeight * 0.75;
+		final double maxScreenHeight = isLandscape ? screenHeight * 0.6 : screenHeight * 0.75;
-		int maxKeyHeight = (int) Math.round(maxScreenHeight / 5);
+		final int maxKeyHeight = (int) Math.round(maxScreenHeight / 5);
 
-		return Math.min(keyHeight, maxKeyHeight);
+		final int defaultHeight = Math.min(tt9.getSettings().getNumpadKeyHeight(), maxKeyHeight);
+
+		// in case some of the Fn keys are hidden, we need to stretch the rest
+		final int lfnCount = tt9.getSettings().getLfnKeyOrder().length();
+		final int lfnHeight = lfnCount > 0 ? defaultHeight * 4 / lfnCount : defaultHeight;
+
+		final int rfnCount = tt9.getSettings().getRfnKeyOrder().length();
+		final int rfnHeight = rfnCount > 0 ? defaultHeight * 4 / rfnCount : defaultHeight;
+
+		return new int[] {defaultHeight, lfnHeight, rfnHeight};
 	}
 
 
-	private void setKeyHeight(int height) {
+	private void setKeyHeight(int defaultHeight, int leftHeight, int rightHeight) {
-		if (view == null || height <= 0) {
+		if (view == null || defaultHeight <= 0) {
 			return;
 		}
 
+		final View leftColumn = view.findViewById(R.id.numpad_column_fn_left);
+		final View rightColumn = view.findViewById(R.id.numpad_column_fn_right);
+
 		for (SoftKey key : getKeys()) {
-			key.setHeight(height);
+			final View wrapper = (View) key.getParent();
+			final View container = wrapper != null ? (View) wrapper.getParent() : null;
+
+			if (container != null && container.equals(leftColumn)) {
+				key.setHeight(leftHeight);
+			}	else if (container != null && container.equals(rightColumn)) {
+				key.setHeight(rightHeight);
+			} else {
+				key.setHeight(defaultHeight);
+			}
 		}
 	}
 
@@ -180,7 +200,7 @@ class MainLayoutNumpad extends BaseMainLayout {
 				Math.round(resources.getDimension(R.dimen.numpad_status_bar_spacing_top))
 				+ resources.getDimensionPixelSize(R.dimen.numpad_status_bar_spacing_bottom)
 				+ resources.getDimensionPixelSize(R.dimen.numpad_suggestion_height)
-				+ getKeyColumnHeight(calculateKeyHeight())
+				+ getKeyColumnHeight(calculateKeyHeight()[0])
 				+ Math.round(resources.getDimension(R.dimen.numpad_keys_spacing_bottom));
 		}
 
@@ -219,58 +239,53 @@ class MainLayoutNumpad extends BaseMainLayout {
 		}
 
 		// status bar
-		ViewGroup statusBar = view.findViewById(R.id.status_bar_container);
+		keys.addAll(getKeysFromContainer(view.findViewById(R.id.status_bar_container)));
-		keys.add(statusBar.findViewById(R.id.soft_key_left_arrow));
-		keys.add(statusBar.findViewById(R.id.soft_key_right_arrow));
-
 
 		// left Fn
-		keys.add(view.findViewById(R.id.soft_key_settings));
+		addKey(R.id.soft_key_settings);
-		keys.add(view.findViewById(R.id.soft_key_add_word));
+		addKey(R.id.soft_key_add_word);
-		keys.add(view.findViewById(R.id.soft_key_shift));
+		addKey(R.id.soft_key_shift);
-		keys.add(view.findViewById(R.id.soft_key_lf4));
+		addKey(R.id.soft_key_lf4);
 
 		// right Fn
-		keys.add(view.findViewById(R.id.soft_key_numpad_backspace));
+		addKey(R.id.soft_key_numpad_backspace);
-		keys.add(view.findViewById(R.id.soft_key_filter));
+		addKey(R.id.soft_key_filter);
-		keys.add(view.findViewById(R.id.soft_key_rf3));
+		addKey(R.id.soft_key_rf3);
-		keys.add(view.findViewById(R.id.soft_key_numpad_ok));
+		addKey(R.id.soft_key_numpad_ok);
 
 		// digits panel
 		ViewGroup table = view.findViewById(R.id.main_soft_keys);
-		keys.add(table.findViewById(R.id.soft_key_0));
+		addKey(R.id.soft_key_0, table);
-		keys.add(table.findViewById(R.id.soft_key_1));
+		addKey(R.id.soft_key_1, table);
-		keys.add(table.findViewById(R.id.soft_key_2));
+		addKey(R.id.soft_key_2, table);
-		keys.add(table.findViewById(R.id.soft_key_3));
+		addKey(R.id.soft_key_3, table);
-		keys.add(table.findViewById(R.id.soft_key_4));
+		addKey(R.id.soft_key_4, table);
-		keys.add(table.findViewById(R.id.soft_key_5));
+		addKey(R.id.soft_key_5, table);
-		keys.add(table.findViewById(R.id.soft_key_6));
+		addKey(R.id.soft_key_6, table);
-		keys.add(table.findViewById(R.id.soft_key_7));
+		addKey(R.id.soft_key_7, table);
-		keys.add(table.findViewById(R.id.soft_key_8));
+		addKey(R.id.soft_key_8, table);
-		keys.add(table.findViewById(R.id.soft_key_9));
+		addKey(R.id.soft_key_9, table);
-		keys.add(table.findViewById(R.id.soft_key_punctuation_1));
+		addKey(R.id.soft_key_punctuation_1, table);
-		keys.add(table.findViewById(R.id.soft_key_punctuation_2));
+		addKey(R.id.soft_key_punctuation_2, table);
 
 		// text editing panel
-		keys.add(table.findViewById(R.id.soft_key_100));
+		addKey(R.id.soft_key_100, table);
-		keys.add(table.findViewById(R.id.soft_key_101));
+		addKey(R.id.soft_key_101, table);
-		keys.add(table.findViewById(R.id.soft_key_102));
+		addKey(R.id.soft_key_102, table);
-		keys.add(table.findViewById(R.id.soft_key_103));
+		addKey(R.id.soft_key_103, table);
-		keys.add(table.findViewById(R.id.soft_key_104));
+		addKey(R.id.soft_key_104, table);
-		keys.add(table.findViewById(R.id.soft_key_105));
+		addKey(R.id.soft_key_105, table);
-		keys.add(table.findViewById(R.id.soft_key_106));
+		addKey(R.id.soft_key_106, table);
-		keys.add(table.findViewById(R.id.soft_key_107));
+		addKey(R.id.soft_key_107, table);
-		keys.add(table.findViewById(R.id.soft_key_108));
+		addKey(R.id.soft_key_108, table);
-		keys.add(table.findViewById(R.id.soft_key_109));
+		addKey(R.id.soft_key_109, table);
-		keys.add(table.findViewById(R.id.soft_key_punctuation_101));
+		addKey(R.id.soft_key_punctuation_101, table);
-		keys.add(table.findViewById(R.id.soft_key_punctuation_102));
+		addKey(R.id.soft_key_punctuation_102, table);
 
 		// Long space panel
-		keys.add(table.findViewById(R.id.soft_key_200));
+		addKey(R.id.soft_key_200, table);
-		keys.add(table.findViewById(R.id.soft_key_punctuation_201));
+		addKey(R.id.soft_key_punctuation_201, table);
-		keys.add(table.findViewById(R.id.soft_key_punctuation_202));
+		addKey(R.id.soft_key_punctuation_202, table);
-
-		keys.addAll(getKeysFromContainer(view.findViewById(R.id.status_bar_container)));
 
 		return keys;
 	}
@@ -302,6 +317,7 @@ class MainLayoutNumpad extends BaseMainLayout {
 			keyWrappers.put(entry.getValue(), view.findViewById(entry.getValue()));
 		}
 
+		hideUnusedFnKeys(keyWrappers, lfnOrder, rfnOrder);
 		reorderFnColumn(left, lfnOrder, keyWrappers);
 		reorderFnColumn(right, rfnOrder, keyWrappers);
 
@@ -310,7 +326,29 @@ class MainLayoutNumpad extends BaseMainLayout {
 	}
 
 
-	private void reorderFnColumn(ViewGroup column, String order, Map<Integer, View> keyWrappers) {
+	private void hideUnusedFnKeys(@NonNull Map<Integer, View> keyWrappers, @NonNull String leftOrder, @NonNull String rightOrder) {
+		for (Map.Entry<Integer, View> entry : keyWrappers.entrySet()) {
+			Integer keyId = entry.getKey();
+			View key = entry.getValue();
+
+			if (key != null && leftOrder.indexOf(keyId) < 0 && rightOrder.indexOf(keyId) < 0) {
+				key.setVisibility(View.GONE);
+			}
+		}
+
+		View leftColumn = view.findViewById(R.id.numpad_column_fn_left);
+		if (leftColumn != null) {
+			leftColumn.setVisibility(leftOrder.isEmpty() ? View.GONE : View.VISIBLE);
+		}
+
+		View rightColumn = view.findViewById(R.id.numpad_column_fn_right);
+		if (rightColumn != null) {
+			rightColumn.setVisibility(rightOrder.isEmpty() ? View.GONE : View.VISIBLE);
+		}
+	}
+
+
+	private void reorderFnColumn(@NonNull ViewGroup column, @NonNull String order, @NonNull Map<Integer, View> keyWrappers) {
 		for (char keyId : order.toCharArray()) {
 			Integer viewId = SettingsVirtualNumpad.KEY_ORDER_MAP.get(keyId);
 			if (viewId == null) {
@@ -325,18 +363,19 @@ class MainLayoutNumpad extends BaseMainLayout {
 
 			((ViewGroup) key.getParent()).removeView(key);
 			column.addView(key);
+			key.setVisibility(View.VISIBLE);
 		}
 	}
 
 
 	@Override
 	void render() {
-		int defaultKeyHeight = calculateKeyHeight();
+		final int[] keyHeights = calculateKeyHeight();
 
 		getView();
 		reorderFnKeys();
 		enableClickHandlers();
-		setKeyHeight(defaultKeyHeight);
+		setKeyHeight(keyHeights[0], keyHeights[1], keyHeights[2]);
 		preventEdgeToEdge();
 		setWidth(tt9.getSettings().getWidthPercent(), tt9.getSettings().getAlignment());
 		setKeyColumnWidth(tt9.getSettings().getNumpadFnKeyScale());
@@ -345,7 +384,7 @@ class MainLayoutNumpad extends BaseMainLayout {
 		boolean hasLettersOnAllKeys = tt9.getLanguage() != null && tt9.getLanguage().hasLettersOnAllKeys();
 		showLongSpace(
 			tt9.getSettings().isNumpadShapeLongSpace() && !tt9.isInputModeNumeric() && !hasLettersOnAllKeys,
-			defaultKeyHeight
+			keyHeights[0]
 		);
 
 		for (SoftKey key : getKeys()) {

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

@@ -221,7 +221,7 @@
 	<string name="function_undo">Отмяна (Undo)</string>
 	<string name="pref_hack_precalculate_navbar_height">Преизчисли долното отстояние</string>
 	<string name="fn_key_order_column_2">Колона 2</string>
-	<string name="fn_key_order_error_wrong_key_count">Трябва да има точно по 4 клавиша в колона.</string>
+	<string name="fn_key_order_error_wrong_key_count">Колоната може да съдържа най-много 4 клавиша.</string>
 	<string name="fn_key_order_error_unsupported_key_code">Разрешени са само кодове на клавиши от 1 до 8.</string>
 	<string name="fn_key_order_error_key_on_both_sides">Един клавиш не може да бъде поставен и в двете колони.</string>
 	<string name="fn_key_order_column_1">Колона 1</string>

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

@@ -223,7 +223,7 @@
 	<string name="function_undo">Rückgängig machen</string>
 	<string name="pref_hack_precalculate_navbar_height">Unteren Abstand neu berechnen</string>
 	<string name="fn_key_order_column_2">Spalte 2</string>
-	<string name="fn_key_order_error_wrong_key_count">Es müssen genau 4 Tasten pro Spalte sein.</string>
+	<string name="fn_key_order_error_wrong_key_count">Die Spalte darf höchstens 4 Tasten enthalten.</string>
 	<string name="fn_key_order_error_unsupported_key_code">Nur Tastencodes 1–8 sind erlaubt.</string>
 	<string name="fn_key_order_error_key_on_both_sides">Eine Taste kann nicht in beiden Spalten platziert werden.</string>
 	<string name="fn_key_order_column_1">Spalte 1</string>

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

@@ -221,7 +221,7 @@
 	<string name="function_undo">Deshacer</string>
 	<string name="pref_hack_precalculate_navbar_height">Recalcular el relleno inferior</string>
 	<string name="fn_key_order_column_2">Columna 2</string>
-	<string name="fn_key_order_error_wrong_key_count">Debe haber exactamente 4 teclas por columna.</string>
+	<string name="fn_key_order_error_wrong_key_count">La columna puede contener como máximo 4 teclas.</string>
 	<string name="fn_key_order_error_unsupported_key_code">Solo se permiten los códigos de tecla del 1 al 8.</string>
 	<string name="fn_key_order_error_key_on_both_sides">Una tecla no puede colocarse en ambas columnas.</string>
 	<string name="fn_key_order_column_1">Columna 1</string>

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

@@ -221,7 +221,7 @@
 	<string name="function_undo">Annuler (Undo)</string>
 	<string name="pref_hack_precalculate_navbar_height">Recalculer le remplissage inférieur</string>
 	<string name="fn_key_order_column_2">Colonne 2</string>
-	<string name="fn_key_order_error_wrong_key_count">Il doit y avoir exactement 4 touches par colonne.</string>
+	<string name="fn_key_order_error_wrong_key_count">La colonne peut contenir au maximum 4 touches.</string>
 	<string name="fn_key_order_error_unsupported_key_code">Seuls les codes de touche 1 à 8 sont autorisés.</string>
 	<string name="fn_key_order_error_key_on_both_sides">Une touche ne peut pas être placée dans les deux colonnes.</string>
 	<string name="fn_key_order_column_1">Colonne 1</string>

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

@@ -224,7 +224,7 @@
 	<string name="function_undo">Annulla (Undo)</string>
 	<string name="pref_hack_precalculate_navbar_height">Ricalcola il margine inferiore</string>
 	<string name="fn_key_order_column_2">Colonna 2</string>
-	<string name="fn_key_order_error_wrong_key_count">Devono esserci esattamente 4 tasti per colonna.</string>
+	<string name="fn_key_order_error_wrong_key_count">La colonna può contenere al massimo 4 tasti.</string>
 	<string name="fn_key_order_error_unsupported_key_code">Sono consentiti solo i codici dei tasti da 1 a 8.</string>
 	<string name="fn_key_order_error_key_on_both_sides">Un tasto non può essere inserito in entrambe le colonne.</string>
 	<string name="fn_key_order_column_1">Colonna 1</string>

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

@@ -228,7 +228,7 @@
 	<string name="function_undo">ביטול (Undo)</string>
 	<string name="pref_hack_precalculate_navbar_height">חשב מחדש ריווח תחתון</string>
 	<string name="fn_key_order_column_2">עמודה 2</string>
-	<string name="fn_key_order_error_wrong_key_count">חייבים להיות בדיוק 4 מקשים בכל עמודה.</string>
+	<string name="fn_key_order_error_wrong_key_count">העמודה יכולה להכיל לכל היותר 4 מקשים.</string>
 	<string name="fn_key_order_error_unsupported_key_code">רק קודי מקשים 1–8 מותרים.</string>
 	<string name="fn_key_order_error_key_on_both_sides">לא ניתן למקם מקש אחד בשתי העמודות.</string>
 	<string name="fn_key_order_column_1">עמודה 1</string>

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

@@ -230,7 +230,7 @@
 	<string name="function_undo">Atšaukti (Undo)</string>
 	<string name="pref_hack_precalculate_navbar_height">Perskaičiuoti apatinį paraštę</string>
 	<string name="fn_key_order_column_2">Stulpelis 2</string>
-	<string name="fn_key_order_error_wrong_key_count">Kiekvienoje stulpelyje turi būti tiksliai 4 klavišai.</string>
+	<string name="fn_key_order_error_wrong_key_count">Stulpelyje gali būti daugiausiai 4 klavišai.</string>
 	<string name="fn_key_order_error_unsupported_key_code">Leidžiami tik klavišų kodai nuo 1 iki 8.</string>
 	<string name="fn_key_order_error_key_on_both_sides">Vieno klavišo negalima dėti į abu stulpelius.</string>
 	<string name="fn_key_order_column_1">Stulpelis 1</string>

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

@@ -222,7 +222,7 @@
 	<string name="function_undo">Ongedaan maken</string>
 	<string name="pref_hack_precalculate_navbar_height">Onderrand opnieuw berekenen</string>
 	<string name="fn_key_order_column_2">Kolom 2</string>
-	<string name="fn_key_order_error_wrong_key_count">Er moeten precies 4 toetsen per kolom zijn.</string>
+	<string name="fn_key_order_error_wrong_key_count">De kolom mag maximaal 4 toetsen bevatten.</string>
 	<string name="fn_key_order_error_unsupported_key_code">Alleen toetscodes 1–8 zijn toegestaan.</string>
 	<string name="fn_key_order_error_key_on_both_sides">Eén toets kan niet in beide kolommen staan.</string>
 	<string name="fn_key_order_column_1">Kolom 1</string>

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

@@ -228,7 +228,7 @@
 	<string name="function_undo">Desfazer</string>
 	<string name="pref_hack_precalculate_navbar_height">Recalcular o espaçamento inferior</string>
 	<string name="fn_key_order_column_2">Coluna 2</string>
-	<string name="fn_key_order_error_wrong_key_count">Deve haver exatamente 4 teclas por coluna.</string>
+	<string name="fn_key_order_error_wrong_key_count">A coluna pode conter no máximo 4 teclas.</string>
 	<string name="fn_key_order_error_unsupported_key_code">Apenas os códigos de tecla de 1 a 8 são permitidos.</string>
 	<string name="fn_key_order_error_key_on_both_sides">Uma tecla não pode estar nas duas colunas.</string>
 	<string name="fn_key_order_column_1">Coluna 1</string>

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

@@ -221,7 +221,7 @@
 	<string name="function_undo">Отменить (Undo)</string>
 	<string name="pref_hack_precalculate_navbar_height">Пересчитать нижний отступ</string>
 	<string name="fn_key_order_column_2">Столбец 2</string>
-	<string name="fn_key_order_error_wrong_key_count">В каждой колонке должно быть ровно 4 клавиши.</string>
+	<string name="fn_key_order_error_wrong_key_count">В столбце может быть не более 4 клавиш.</string>
 	<string name="fn_key_order_error_unsupported_key_code">Разрешены только коды клавиш от 1 до 8.</string>
 	<string name="fn_key_order_error_key_on_both_sides">Одна клавиша не может находиться в обеих колонках.</string>
 	<string name="fn_key_order_column_1">Столбец 1</string>

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

@@ -226,7 +226,7 @@
 	<string name="function_undo">Geri al (Undo)</string>
 	<string name="pref_hack_precalculate_navbar_height">Alt boşluğu yeniden hesapla</string>
 	<string name="fn_key_order_column_2">Sütun 2</string>
-	<string name="fn_key_order_error_wrong_key_count">Her sütunda tam olarak 4 tuş olmalıdır.</string>
+	<string name="fn_key_order_error_wrong_key_count">Sütun en fazla 4 tuş içerebilir.</string>
 	<string name="fn_key_order_error_unsupported_key_code">Yalnızca 1–8 arası tuş kodlarına izin verilir.</string>
 	<string name="fn_key_order_error_key_on_both_sides">Bir tuş her iki sütuna da yerleştirilemez.</string>
 	<string name="fn_key_order_column_1">Sütun 1</string>

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

@@ -232,7 +232,7 @@
 	<string name="function_undo">Скасувати (Undo)</string>
 	<string name="pref_hack_precalculate_navbar_height">Перерахувати нижній відступ</string>
 	<string name="fn_key_order_column_2">Стовпець 2</string>
-	<string name="fn_key_order_error_wrong_key_count">У кожному стовпці має бути рівно 4 клавіші.</string>
+	<string name="fn_key_order_error_wrong_key_count">У стовпці може бути щонайбільше 4 клавіші.</string>
 	<string name="fn_key_order_error_unsupported_key_code">Дозволено лише коди клавіш від 1 до 8.</string>
 	<string name="fn_key_order_error_key_on_both_sides">Одна клавіша не може бути в обох стовпцях.</string>
 	<string name="fn_key_order_column_1">Стовпець 1</string>

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

@@ -164,7 +164,7 @@
 
 	<string name="fn_key_order_column_1">Column 1</string>
 	<string name="fn_key_order_column_2">Column 2</string>
-	<string name="fn_key_order_error_wrong_key_count">There must be exactly 4 keys per column.</string>
+	<string name="fn_key_order_error_wrong_key_count">The column can contain at most 4 keys.</string>
 	<string name="fn_key_order_error_unsupported_key_code">Only key codes 1–8 are allowed.</string>
 	<string name="fn_key_order_error_key_on_both_sides">One key cannot be placed in both columns.</string>
 	<string name="fn_key_order_error_duplicate_key">No duplicate keys allowed.</string>