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Implement multi-language support with language selection screen #8

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60c243b
Implement multi-language support with language selection screen
Dec 21, 2025
87743a4
Implement multi-language support with language selection screen
Dec 22, 2025
0e4d5c3
Fix multi-language support: correct typo, remove deprecated methods, …
Dec 23, 2025
d1f1651
Merge branch 'main' into feature/multi-language-support
gyanu2507 Jan 31, 2026
2eb94d7
Fix app-wide locale and English fallback
gyanu2507 Aug 31, 2026
2d9dea2
Apply selected language to the whole app, not just LanguageActivity.
gyanu2507 Sep 3, 2026
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Apply selected language to the whole app, not just LanguageActivity. 
Persist English without a country tag so switching back from Hindi works, and move remaining hardcoded UI copy into translated string resources.
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@gyanu2507
gyanu2507 committed Sep 3, 2026
commit 2d9dea2840e77286702285a04f8fe766dacb19ca
8 changes: 2 additions & 6 deletions app/src/main/java/com/example/updateapp/UpdateApplication.java
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Expand Up @@ -15,10 +15,6 @@ protected void attachBaseContext(Context base) {
@Override
public void onCreate() {
super.onCreate();
LocaleHelper.setLocale(
this,
LocaleHelper.getLanguage(this),
LocaleHelper.getCountry(this)
);
LocaleHelper.applyPersistedLocales(this);
}
}
}
3 changes: 3 additions & 0 deletions app/src/main/java/com/example/updateapp/adapters/LanguageAdapter.java
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Expand Up @@ -49,6 +49,9 @@ public void onBindViewHolder(@NonNull LanguageViewHolder holder, int position) {
selected ? R.drawable.bg_language_item_selected : R.drawable.bg_language_item
);
holder.imgSelected.setVisibility(selected ? View.VISIBLE : View.INVISIBLE);
holder.imgSelected.setContentDescription(
selected ? context.getString(R.string.selected_language) : null
);
holder.txtLanguageName.setTextColor(
ContextCompat.getColor(context, selected ? R.color.themeColor : R.color.black)
);
Expand Down
119 changes: 47 additions & 72 deletions app/src/main/java/com/example/updateapp/utils/LocaleHelper.java
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Expand Up @@ -4,114 +4,89 @@
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.os.Build;
import android.os.LocaleList;

import androidx.appcompat.app.AppCompatDelegate;
import androidx.core.os.LocaleListCompat;

import java.util.Locale;

/**
* Single source of truth for the in-app language.
* English is stored and applied as {@code en} with no country, so Android falls
* back to {@code values/} instead of hunting for {@code values-en-rUS}.
*/
public final class LocaleHelper {

public class LocaleHelper {
private static final String SELECTED_LANGUAGE = "Locale.Helper.Selected.Language";
private static final String SELECTED_COUNTRY = "Locale.Helper.Selected.Country";
private static final String PREFS_NAME = "app_prefs";
private static final String KEY_LANGUAGE = "Locale.Helper.Selected.Language";
private static final String KEY_COUNTRY = "Locale.Helper.Selected.Country";
public static final String DEFAULT_LANGUAGE = "en";

private LocaleHelper() {}

public static Context onAttach(Context context) {
return onAttach(context, DEFAULT_LANGUAGE);
return onAttach(context, "en");
}

public static Context onAttach(Context context, String defaultLanguage) {
String lang = getLanguage(context, defaultLanguage);
String country = getCountry(context);
return updateResources(context, lang, country);
String lang = getPersistedData(context, defaultLanguage);
String country = getPersistedCountry(context, "");
return wrap(context, lang, country);
}

public static String getLanguage(Context context) {
return getLanguage(context, DEFAULT_LANGUAGE);
}

public static String getLanguage(Context context, String defaultLanguage) {
SharedPreferences preferences = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
String lang = preferences.getString(KEY_LANGUAGE, defaultLanguage);
if (lang == null || lang.isEmpty()) {
return defaultLanguage;
}
return lang;
return getPersistedData(context, "en");
}

public static String getCountry(Context context) {
SharedPreferences preferences = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
String country = preferences.getString(KEY_COUNTRY, "");
return country == null ? "" : country;
return getPersistedCountry(context, "");
}

public static boolean isEnglish(String language) {
return language == null || language.isEmpty() || language.equalsIgnoreCase(DEFAULT_LANGUAGE);
public static void applyPersistedLocales(Context context) {
applyAppLocales(getLanguage(context), getCountry(context));
}

public static Context setLocale(Context context, String language, String country) {
String lang = isEnglish(language) ? DEFAULT_LANGUAGE : language;
String region = isEnglish(lang) ? "" : (country == null ? "" : country);
persist(context, lang, region);
applyAppLocales(lang, region);
Context app = context.getApplicationContext();
if (app != null && app != context) {
updateResources(app, lang, region);
if (language == null || language.isEmpty()) {
language = "en";
}
return updateResources(context, lang, region);
if (country == null || "en".equals(language)) {
country = "";
}
persist(context, language, country);
applyAppLocales(language, country);
return wrap(context, language, country);
}

public static Locale toLocale(String language, String country) {
if (isEnglish(language)) {
return Locale.ENGLISH;
}
if (country != null && !country.isEmpty()) {
return new Locale(language, country);
}
return new Locale(language);
private static void applyAppLocales(String language, String country) {
String tag = (country == null || country.isEmpty())
? language
: language + "-" + country;
AppCompatDelegate.setApplicationLocales(LocaleListCompat.forLanguageTags(tag));
}

private static void persist(Context context, String language, String country) {
SharedPreferences.Editor editor =
context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE).edit();
editor.putString(KEY_LANGUAGE, language);
editor.putString(KEY_COUNTRY, country == null ? "" : country);
editor.apply();
private static String getPersistedData(Context context, String defaultLanguage) {
SharedPreferences preferences = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
return preferences.getString(SELECTED_LANGUAGE, defaultLanguage);
}

private static void applyAppLocales(String language, String country) {
String tag = isEnglish(language)
? "en"
: (country != null && !country.isEmpty() ? language + "-" + country : language);
AppCompatDelegate.setApplicationLocales(LocaleListCompat.forLanguageTags(tag));
private static String getPersistedCountry(Context context, String defaultCountry) {
SharedPreferences preferences = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
return preferences.getString(SELECTED_COUNTRY, defaultCountry);
}

private static void persist(Context context, String language, String country) {
SharedPreferences preferences = context.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
SharedPreferences.Editor editor = preferences.edit();
editor.putString(SELECTED_LANGUAGE, language);
editor.putString(SELECTED_COUNTRY, country == null ? "" : country);
editor.apply();
}

private static Context updateResources(Context context, String language, String country) {
Locale locale = toLocale(language, country);
private static Context wrap(Context context, String language, String country) {
Locale locale;
if (country != null && !country.isEmpty()) {
locale = new Locale(language, country);
} else {
locale = new Locale(language);
}
Locale.setDefault(locale);

Resources resources = context.getResources();
Configuration configuration = new Configuration(resources.getConfiguration());
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
configuration.setLocale(locale);
configuration.setLocales(new LocaleList(locale));
configuration.setLayoutDirection(locale);
return context.createConfigurationContext(configuration);
}

configuration.locale = locale;
configuration.setLocale(locale);
configuration.setLayoutDirection(locale);
resources.updateConfiguration(configuration, resources.getDisplayMetrics());
return context;
return context.createConfigurationContext(configuration);
}
}
88 changes: 41 additions & 47 deletions app/src/main/java/com/example/updateapp/views/activites/LanguageActivity.java
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@@ -1,9 +1,7 @@
package com.example.updateapp.views.activites;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
Expand All @@ -16,7 +14,6 @@
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import com.example.updateapp.Helpers.SaveState;
import com.example.updateapp.MainActivity;
import com.example.updateapp.R;
import com.example.updateapp.adapters.LanguageAdapter;
Expand All @@ -31,17 +28,9 @@ public class LanguageActivity extends AppCompatActivity implements LanguageAdapt
private RecyclerView recyclerView;
private LanguageAdapter languageAdapter;
private List<LanguageModel> languageList;
private ImageView imgDone;
private ImageView imgBack;
private ImageView imgDone, imgBack;
private TextView txtTitle;
private TextView txtSubtitle;
private int selectedPosition = 0;
private boolean isFirstLaunch;

@Override
protected void attachBaseContext(Context newBase) {
super.attachBaseContext(LocaleHelper.onAttach(newBase));
}

@Override
protected void onCreate(Bundle savedInstanceState) {
Expand All @@ -54,33 +43,29 @@ protected void onCreate(Bundle savedInstanceState) {
return insets;
});

isFirstLaunch = getIntent().getBooleanExtra("isFirstLaunch", false);

initViews();
setupLanguageList();
setupRecyclerView();
setupClickListeners();
}

private void initViews() {
recyclerView = findViewById(R.id.rev_language);
recyclerView = findViewById(R.id.rev_langauge);
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imgDone = findViewById(R.id.img_done);
imgBack = findViewById(R.id.img_back);
txtTitle = findViewById(R.id.txt_title);
txtSubtitle = findViewById(R.id.txt_subtitle);

txtTitle.setText(getString(R.string.select_language));
if (txtSubtitle != null) {
txtSubtitle.setText(getString(R.string.choose_language));
}

imgDone.setContentDescription(getString(R.string.done));
imgBack.setContentDescription(getString(R.string.back));
imgBack.setVisibility(isFirstLaunch ? View.GONE : View.VISIBLE);

// Set title from string resource
txtTitle.setText(getString(R.string.language));

// Show back button
imgBack.setVisibility(android.view.View.VISIBLE);
}

private void setupLanguageList() {
languageList = new ArrayList<>();

// Add all 10 supported languages
languageList.add(new LanguageModel(getString(R.string.lang_english), "en", ""));
languageList.add(new LanguageModel(getString(R.string.lang_chinese), "zh", "CN"));
languageList.add(new LanguageModel(getString(R.string.lang_hindi), "hi", "IN"));
Expand All @@ -93,15 +78,16 @@ private void setupLanguageList() {
languageList.add(new LanguageModel(getString(R.string.lang_urdu), "ur", "PK"));

String currentLanguage = LocaleHelper.getLanguage(this);
selectedPosition = 0;
boolean found = false;
for (int i = 0; i < languageList.size(); i++) {
boolean match = languageList.get(i).getLanguageCode().equalsIgnoreCase(currentLanguage);
languageList.get(i).setSelected(match);
if (match) {
if (languageList.get(i).getLanguageCode().equals(currentLanguage)) {
languageList.get(i).setSelected(true);
selectedPosition = i;
found = true;
break;
}
}
if (!languageList.get(selectedPosition).isSelected()) {
if (!found) {
languageList.get(0).setSelected(true);
selectedPosition = 0;
}
Expand All @@ -111,12 +97,12 @@ private void setupRecyclerView() {
languageAdapter = new LanguageAdapter(this, languageList, this);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(languageAdapter);
recyclerView.setHasFixedSize(true);
}

private void setupClickListeners() {
imgDone.setOnClickListener(v -> applyLanguageChange());
imgBack.setOnClickListener(v -> getOnBackPressedDispatcher().onBackPressed());

imgBack.setOnClickListener(v -> onBackPressed());
}

@Override
Expand All @@ -126,25 +112,33 @@ public void onLanguageSelected(LanguageModel language, int position) {
}

private void applyLanguageChange() {
LanguageModel selectedLanguage = languageList.get(selectedPosition);
LocaleHelper.setLocale(
this,
selectedLanguage.getLanguageCode(),
selectedLanguage.getCountryCode()
);

new SaveState(this, "LANGUAGE_SELECTED").setState(1);
Toast.makeText(this, getString(R.string.language_changed), Toast.LENGTH_SHORT).show();
restartApp();
if (selectedPosition >= 0 && selectedPosition < languageList.size()) {
LanguageModel selectedLanguage = languageList.get(selectedPosition);

// Apply the language change immediately
LocaleHelper.setLocale(this, selectedLanguage.getLanguageCode(), selectedLanguage.getCountryCode());

// Show success message
Toast.makeText(this, getString(R.string.language_changed), Toast.LENGTH_SHORT).show();

// Restart the main activity to apply changes completely
restartApp();
}
}

private void restartApp() {
Intent intent = isFirstLaunch
? new Intent(this, OnboardingActivity.class)
: new Intent(this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
// Create intent to restart the main activity
Intent intent = new Intent(this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
finish();

// Apply transition animation
overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out);
}
}

@Override
protected void attachBaseContext(android.content.Context newBase) {
super.attachBaseContext(LocaleHelper.onAttach(newBase));
}
}
8 changes: 4 additions & 4 deletions app/src/main/java/com/example/updateapp/views/activites/OTPActivity.java
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Expand Up @@ -183,15 +183,15 @@ private void verifyCredential(PhoneAuthCredential credential) {
dialog.dismiss();

Exception e = linkTask.getException();
String msg = e != null ? e.getMessage() : "Unknown linking error";
String msg = e != null ? e.getMessage() : getString(R.string.unknown_linking_error);

if (e instanceof FirebaseAuthUserCollisionException) {
Toast.makeText(OTPActivity.this,
"This email is already registered with a different account. Please login with that email or use another email.",
getString(R.string.email_already_registered_different),
Toast.LENGTH_LONG).show();
} else {
Toast.makeText(OTPActivity.this,
"Failed to link email: " + msg,
getString(R.string.failed_to_link_email, msg),
Toast.LENGTH_LONG).show();
}
}
Expand Down Expand Up @@ -224,7 +224,7 @@ private void saveUserToFirestoreAndContinue(String uid, String name, String emai
})
.addOnFailureListener(e -> {
if (dialog.isShowing()) dialog.dismiss();
Toast.makeText(OTPActivity.this, getString(R.string.failed_save_user, e.getMessage()), Toast.LENGTH_LONG).show();
Toast.makeText(OTPActivity.this, getString(R.string.failed_to_save_user, e.getMessage()), Toast.LENGTH_LONG).show();
});
}

Expand Down
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