fixed a potential NullPointerException when trying to type with no language

app/src/main/java/io/github/sspanak/tt9/ime/modes/InputMode.java

@@ -1,6 +1,7 @@
 package io.github.sspanak.tt9.ime.modes;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 
 import java.util.ArrayList;
 
@@ -8,6 +9,7 @@ import io.github.sspanak.tt9.hacks.InputType;
 import io.github.sspanak.tt9.ime.helpers.TextField;
 import io.github.sspanak.tt9.languages.Language;
 import io.github.sspanak.tt9.languages.NaturalLanguage;
+import io.github.sspanak.tt9.languages.NullLanguage;
 import io.github.sspanak.tt9.preferences.settings.SettingsStore;
 import io.github.sspanak.tt9.util.Logger;
 
@@ -31,9 +33,9 @@ abstract public class InputMode {
 	// data
 	protected int autoAcceptTimeout = -1;
 	@NonNull protected String digitSequence = "";
-	protected Language language;
+	@NonNull protected Language language = new NullLanguage();
 	protected final SettingsStore settings;
-	protected final ArrayList<String> suggestions = new ArrayList<>();
+	@NonNull protected final ArrayList<String> suggestions = new ArrayList<>();
 	@NonNull protected Runnable onSuggestionsUpdated = () -> {};
 	protected int specialCharSelectedGroup = 0;
 
@@ -43,7 +45,7 @@ abstract public class InputMode {
 	}
 
 
-	public static InputMode getInstance(SettingsStore settings, Language language, InputType inputType, TextField textField, int mode) {
+	public static InputMode getInstance(SettingsStore settings, @Nullable Language language, InputType inputType, TextField textField, int mode) {
 		switch (mode) {
 			case MODE_PREDICTIVE:
 				return new ModePredictive(settings, inputType, textField, language);
@@ -103,10 +105,8 @@ abstract public class InputMode {
 	public int getAutoAcceptTimeout() {
 		return autoAcceptTimeout;
 	}
-	public void changeLanguage(Language newLanguage) {
+	public void changeLanguage(@Nullable Language newLanguage) {
-		if (newLanguage != null) {
+		language = newLanguage != null ? newLanguage : new NullLanguage();
-			language = newLanguage;
-		}
 	}
 
 	// Interaction with the IME. Return "true" if it should perform the respective action.
@@ -181,7 +181,7 @@ abstract public class InputMode {
 
 
 	protected boolean loadSpecialCharacters() {
-		if (language == null || digitSequence.isEmpty()) {
+		if (digitSequence.isEmpty()) {
 			return false;
 		}
 
@@ -208,7 +208,7 @@ abstract public class InputMode {
 	 * list of characters, for example in email, numeric or other specialized fields.
 	 */
 	protected ArrayList<String> applyPunctuationOrder(ArrayList<String> unordered, int key) {
-		if (language == null || specialCharSelectedGroup != 0 || key > 1) {
+		if (specialCharSelectedGroup != 0 || key > 1) {
 			return new ArrayList<>(unordered);
 		}
 

app/src/main/java/io/github/sspanak/tt9/ime/modes/ModeABC.java

@@ -1,6 +1,7 @@
 package io.github.sspanak.tt9.ime.modes;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 
 import java.util.ArrayList;
 
@@ -85,8 +86,8 @@ public class ModeABC extends InputMode {
 	}
 
 	@Override
-	public void changeLanguage(Language language) {
+	public void changeLanguage(@Nullable Language newLanguage) {
-		super.changeLanguage(language);
+		super.changeLanguage(newLanguage);
 
 		allowedTextCases.clear();
 		allowedTextCases.add(CASE_LOWER);
@@ -112,10 +113,6 @@ public class ModeABC extends InputMode {
 	@NonNull
 	@Override
 	public String toString() {
-		if (language == null) {
-			return textCase == CASE_LOWER ? "abc" : "ABC";
-		}
-
 		String modeString = language.getAbcString();
 
 		// There are many languages written using the same alphabet, so if the user has

app/src/main/java/io/github/sspanak/tt9/ime/modes/ModePredictive.java

@@ -1,6 +1,7 @@
 package io.github.sspanak.tt9.ime.modes;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 
 import java.util.ArrayList;
 
@@ -107,8 +108,8 @@ public class ModePredictive extends InputMode {
 
 
 	@Override
-	public void changeLanguage(Language language) {
+	public void changeLanguage(@Nullable Language newLanguage) {
-		super.changeLanguage(language);
+		super.changeLanguage(newLanguage);
 
 		autoSpace.setLanguage(language);
 
@@ -509,10 +510,6 @@ public class ModePredictive extends InputMode {
 	@NonNull
 	@Override
 	public String toString() {
-		if (language == null) {
-			return "Predictive";
-		}
-
 		String modeString = language.getName();
 		if (textCase == CASE_UPPER) {
 			return modeString.toUpperCase(language.getLocale());

app/src/main/java/io/github/sspanak/tt9/ime/modes/helpers/Predictions.java

@@ -108,8 +108,8 @@ public class Predictions {
 	private void loadWithoutLeadingPunctuation() {
 		DataStore.getWords(
 			(dbWords) -> {
-				char firstChar = inputWord.charAt(0);
+				char firstChar = inputWord.isEmpty() ? 0 : inputWord.charAt(0);
-				for (int i = 0; i < dbWords.size(); i++) {
+				for (int i = 0; firstChar > 0 && i < dbWords.size(); i++) {
 					dbWords.set(i, firstChar + dbWords.get(i));
 				}
 				onDbWords(dbWords, false);

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

@@ -61,7 +61,7 @@ public class LanguageCollection {
 	@NonNull public static Language getDefault(Context context) {
 		Language language = getByLocale(context, SystemSettings.getLocale());
 		language = language == null ? getByLocale(context, "en") : language;
-		return language == null ? new NullLanguage(context) : language;
+		return language == null ? new NullLanguage() : language;
 	}
 
 	@Nullable

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

@@ -1,18 +1,14 @@
 package io.github.sspanak.tt9.languages;
 
-import android.content.Context;
-
 import androidx.annotation.NonNull;
 
 import java.util.ArrayList;
 import java.util.Locale;
 
-import io.github.sspanak.tt9.R;
-
 public class NullLanguage extends Language {
-	public NullLanguage(Context context) {
+	public NullLanguage() {
 		locale = Locale.ROOT;
-		name = context.getString(R.string.no_language);
+		name = "Nulla Lingua";
 		abcString = "ABC";
 		code = "";
 		dictionaryFile = "";

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

@@ -4,7 +4,6 @@
 	<string name="pref_font_size_large">Голям</string>
 	<string name="completed">Завършено</string>
 	<string name="loading">Зареждане…</string>
-	<string name="no_language">Няма език</string>
 	<string name="error_unexpected">Възникна неочаквана грешка.</string>
 	<string name="add_word_add">Добави</string>
 	<string name="add_word_no_selection">Преместете показалеца върху дума, за да я добавите към речника.</string>

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

@@ -2,7 +2,6 @@
 <resources>
 	<string name="app_settings">TT9 Einstellungen</string>
 	<string name="loading">Laden…</string>
-	<string name="no_language">Keine Sprache</string>
 	<string name="error_unexpected">Unerwarteter Fehler aufgetreten.</string>
 
 	<string name="add_word_add">Hinzufügen</string>

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

@@ -14,7 +14,6 @@
 	<string name="pref_font_size_large">Grande</string>
 	<string name="completed">Terminado</string>
 	<string name="loading">Cargando…</string>
-	<string name="no_language">Sin idioma</string>
 	<string name="error_unexpected">Ocurrió un error inesperado.</string>
 	<string name="add_word_exist">La palabra \"%1$s\" ya esta en el diccionario.</string>
 	<string name="add_word_invalid_language_x">No se puede agregar una palabra. Idioma desconocido: \"%1$d\".</string>

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

@@ -4,7 +4,6 @@
 	<string name="pref_font_size_large">Grande</string>
 	<string name="completed">Fini</string>
 	<string name="loading">Chargement…</string>
-	<string name="no_language">Aucun langue</string>
 	<string name="error_unexpected">Une erreur inattendue s\'est produite.</string>
 	<string name="add_word_add">Ajouter</string>
 	<string name="add_word_no_selection">Déplacez le curseur dans un mot pour l\'ajouter.</string>

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

@@ -4,7 +4,6 @@
 	<string name="pref_font_size_large">Grande</string>
 	<string name="completed">Completato</string>
 	<string name="loading">Caricamento…</string>
-	<string name="no_language">Nessuna lingua</string>
 	<string name="error_unexpected">Si è verificato un errore imprevisto.</string>
 
 	<string name="add_word_add">Aggiungere</string>

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

@@ -4,7 +4,6 @@
 	<string name="pref_font_size_large">גדול</string>
 	<string name="completed">הסתיים</string>
 	<string name="loading">טוען…</string>
-	<string name="no_language">אין שפה</string>
 	<string name="error_unexpected">אירעה שגיאה לא צפויה.</string>
 
 	<string name="add_word_add">הוסף</string>

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

@@ -4,7 +4,6 @@
 	<string name="pref_font_size_large">Didelis</string>
 	<string name="completed">Baigta</string>
 	<string name="loading">Įkeliama…</string>
-	<string name="no_language">Kalbos nėra</string>
 
 	<string name="error_unexpected">Įvyko netikėta klaida.</string>
 

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

@@ -2,7 +2,6 @@
 <resources>
 	<string name="app_settings">TT9 Opties</string>
 	<string name="loading">Laden…</string>
-	<string name="no_language">Geen taal</string>
 	<string name="error_unexpected">Er is een onverwachte fout opgetreden.</string>
 
 	<string name="add_word_add">Toevoegen</string>

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

@@ -4,7 +4,6 @@
 	<string name="pref_font_size_large">Grande</string>
 	<string name="completed">Concluído</string>
 	<string name="loading">Carregando…</string>
-	<string name="no_language">Sem idioma</string>
 	<string name="error_unexpected">Um erro inesperado aconteceu.</string>
 
 	<string name="add_word_add">Adicionar</string>

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

@@ -4,7 +4,6 @@
 	<string name="pref_font_size_large">Крупный</string>
 	<string name="completed">Выполнено</string>
 	<string name="loading">Загрузка…</string>
-	<string name="no_language">Нет языка</string>
 	<string name="error_unexpected">Произошла непредвиденная ошибка.</string>
 	<string name="add_word_add">Добавить</string>
 	<string name="add_word_no_selection">Переместите курсор внутрь слова, чтобы добавить его.</string>

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

@@ -2,7 +2,6 @@
 <resources>
 	<string name="app_settings">TT9 Ayarlar</string>
 	<string name="loading">Yükleniyor…</string>
-	<string name="no_language">Yüklü Dil Yok</string>
 	<string name="error_unexpected">Beklenmeyen bir hata ile karşılaşıldı.</string>
 
 	<string name="add_word_add">Ekle</string>

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

@@ -4,7 +4,6 @@
 	<string name="pref_font_size_large">Великий</string>
 	<string name="completed">Виконано</string>
 	<string name="loading">Завантаження…</string>
-	<string name="no_language">Немає мови</string>
 
 	<string name="error_unexpected">Сталася неочікувана помилка.</string>
 

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

@@ -7,7 +7,6 @@
 	<string name="completed">Completed</string>
 	<string name="loading">Loading…</string>
 	<string name="language">Language</string>
-	<string name="no_language">No Language</string>
 	<string name="search_results">Search Results</string>
 	<string name="search_results_void">No results.</string>
 
@@ -24,7 +23,6 @@
 	<string name="add_word_success">\"%1$s\" added.</string>
 	<string name="add_word_title">Add Word</string>
 
-
 	<string name="commands_select_command">Select a Command</string>
 
 	<string name="pref_category_about">About</string>