앱 내 다국어 언어설정 기능 추가

app/src/main/AndroidManifest.xml

@@ -109,6 +109,7 @@
         <activity android:name=".main.MainActivity" />
         <activity android:name=".user.login.LoginActivity" />
         <activity android:name=".audio_content.all.AudioContentAllActivity" />
+        <activity android:name=".settings.language.LanguageSettingsActivity" />
         <activity
             android:name=".user.signup.SignUpActivity"
             android:windowSoftInputMode="stateVisible" />

app/src/main/java/kr/co/vividnext/sodalive/base/BaseActivity.kt

@@ -18,6 +18,7 @@ import androidx.localbroadcastmanager.content.LocalBroadcastManager
 import androidx.viewbinding.ViewBinding
 import io.reactivex.rxjava3.disposables.CompositeDisposable
 import kotlin.math.max
+import kr.co.vividnext.sodalive.settings.language.LocaleHelper
 
 abstract class BaseActivity<T : ViewBinding>(
     private val inflate: (LayoutInflater) -> T
@@ -43,6 +44,12 @@ abstract class BaseActivity<T : ViewBinding>(
         }
     }
 
+    override fun attachBaseContext(newBase: Context) {
+        // 앱 설정 언어가 있으면 해당 Locale을 적용한 Context로 래핑한다.
+        val wrapped = LocaleHelper.wrap(newBase)
+        super.attachBaseContext(wrapped)
+    }
+
     @SuppressLint("SourceLockedOrientationActivity")
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)

app/src/main/java/kr/co/vividnext/sodalive/common/Utils.kt

@@ -4,6 +4,7 @@ import android.content.Context
 import android.os.Build
 import java.net.URLEncoder
 import java.nio.charset.StandardCharsets
+import kr.co.vividnext.sodalive.settings.language.LanguageManager
 
 object Utils {
     fun convertDurationToString(duration: Int, showHours: Boolean = true): String {
@@ -42,13 +43,7 @@ object Utils {
     }
 
     fun getCurrentLanguageCode(context: Context): String {
-        val config = context.resources.configuration
+        // 효과적 언어 코드(사용자 설정 > 시스템 지원 언어 > ko)를 반환한다.
-        val locale = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+        return LanguageManager.getEffectiveLanguage(context)
-            config.locales.get(0)
-        } else {
-            @Suppress("DEPRECATION")
-            config.locale
-        }
-        return locale.language  // "ko", "en" 등
     }
 }

app/src/main/java/kr/co/vividnext/sodalive/settings/SettingsActivity.kt

@@ -22,6 +22,7 @@ import kr.co.vividnext.sodalive.databinding.ActivitySettingsBinding
 import kr.co.vividnext.sodalive.mypage.alarm.AlarmViewModel
 import kr.co.vividnext.sodalive.mypage.recent.RecentContentViewModel
 import kr.co.vividnext.sodalive.settings.notification.NotificationSettingsActivity
+import kr.co.vividnext.sodalive.settings.language.LanguageSettingsActivity
 import kr.co.vividnext.sodalive.settings.signout.SignOutActivity
 import kr.co.vividnext.sodalive.settings.terms.TermsActivity
 import kr.co.vividnext.sodalive.splash.SplashActivity
@@ -99,6 +100,10 @@ class SettingsActivity : BaseActivity<ActivitySettingsBinding>(ActivitySettingsB
             binding.rlContentSettings.visibility = View.GONE
         }
 
+        binding.rlLanguageSettings.setOnClickListener {
+            startActivity(Intent(applicationContext, LanguageSettingsActivity::class.java))
+        }
+
         binding.rlTerms.setOnClickListener {
             val intent = Intent(applicationContext, TermsActivity::class.java)
             intent.putExtra(Constants.EXTRA_TERMS, Constants.EXTRA_TERMS)

app/src/main/java/kr/co/vividnext/sodalive/settings/language/LanguageManager.kt

@@ -0,0 +1,69 @@
+package kr.co.vividnext.sodalive.settings.language
+
+import android.content.Context
+import android.content.SharedPreferences
+import android.os.Build
+import androidx.core.content.edit
+import androidx.preference.PreferenceManager
+
+object LanguageManager {
+    const val LANG_KO = "ko"
+    const val LANG_EN = "en"
+    const val LANG_JA = "ja"
+
+    private const val PREF_KEY_APP_LANGUAGE = "pref_app_language_code"
+
+    private fun prefs(context: Context): SharedPreferences =
+        PreferenceManager.getDefaultSharedPreferences(context.applicationContext)
+
+    fun isSupported(code: String): Boolean = when (code) {
+        LANG_KO, LANG_EN, LANG_JA -> true
+        else -> false
+    }
+
+    /**
+     * 사용자가 앱 내에서 명시적으로 선택한 언어 코드를 반환한다. 없으면 null.
+     */
+    fun getUserSelectedLanguageOrNull(context: Context): String? {
+        val code = prefs(context).getString(PREF_KEY_APP_LANGUAGE, null)
+        return code?.takeIf { it.isNotBlank() }
+    }
+
+    /**
+     * 기존 동작 유지를 위해 남겨두지만, 기본값 강제 ko 대신 효과적 언어를 반환하도록 수정한다.
+     * 가급적 [getEffectiveLanguage] 사용을 권장.
+     */
+    fun getSelectedLanguage(context: Context): String {
+        return getEffectiveLanguage(context)
+    }
+
+    /**
+     * 효과적 언어 코드 계산 로직
+     * 1) 사용자가 앱에서 언어를 선택했다면 그 값을 반환
+     * 2) 없으면 시스템 언어가 지원 언어면 시스템 언어 반환
+     * 3) 그 외에는 ko로 폴백
+     */
+    fun getEffectiveLanguage(context: Context): String {
+        // 1) 사용자 지정 언어 우선
+        val user = getUserSelectedLanguageOrNull(context)
+        if (!user.isNullOrBlank() && isSupported(user)) return user
+
+        // 2) 시스템 언어가 지원되면 그대로 사용
+        val config = context.resources.configuration
+        val systemLang = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            config.locales.get(0)?.language
+        } else {
+            @Suppress("DEPRECATION")
+            config.locale?.language
+        }
+        if (!systemLang.isNullOrBlank() && isSupported(systemLang)) return systemLang
+
+        // 3) 폴백
+        return LANG_KO
+    }
+
+    fun setSelectedLanguage(context: Context, code: String) {
+        val normalized = if (isSupported(code)) code else LANG_KO
+        prefs(context).edit { putString(PREF_KEY_APP_LANGUAGE, normalized) }
+    }
+}

app/src/main/java/kr/co/vividnext/sodalive/settings/language/LanguageSettingsActivity.kt

@@ -0,0 +1,56 @@
+package kr.co.vividnext.sodalive.settings.language
+
+import android.content.Intent
+import android.os.Bundle
+import kr.co.vividnext.sodalive.base.BaseActivity
+import kr.co.vividnext.sodalive.databinding.ActivityLanguageSettingsBinding
+import kr.co.vividnext.sodalive.splash.SplashActivity
+
+class LanguageSettingsActivity : BaseActivity<ActivityLanguageSettingsBinding>(
+    ActivityLanguageSettingsBinding::inflate
+) {
+
+    private lateinit var selectedCode: String
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        selectedCode = LanguageManager.getSelectedLanguage(this)
+        applyCheckedState(selectedCode)
+    }
+
+    override fun setupView() {
+        binding.toolbar.tvBack.text = binding.root.context.getString(
+            kr.co.vividnext.sodalive.R.string.screen_settings_language
+        )
+        binding.toolbar.tvBack.setOnClickListener { finish() }
+
+        binding.rlKo.setOnClickListener { onLanguageSelected(LanguageManager.LANG_KO) }
+        binding.rlEn.setOnClickListener { onLanguageSelected(LanguageManager.LANG_EN) }
+        binding.rlJa.setOnClickListener { onLanguageSelected(LanguageManager.LANG_JA) }
+
+        binding.tvApply.setOnClickListener { applyAndRestart() }
+    }
+
+    private fun onLanguageSelected(code: String) {
+        selectedCode = code
+        applyCheckedState(code)
+    }
+
+    private fun applyCheckedState(code: String) {
+        val isKo = code == LanguageManager.LANG_KO
+        val isEn = code == LanguageManager.LANG_EN
+        val isJa = code == LanguageManager.LANG_JA
+        binding.rbKo.isChecked = isKo
+        binding.rbEn.isChecked = isEn
+        binding.rbJa.isChecked = isJa
+    }
+
+    private fun applyAndRestart() {
+        LanguageManager.setSelectedLanguage(this, selectedCode)
+        // 전체 액티비티에 새로운 Locale이 반영되도록 스플래시로 재시작
+        val intent = Intent(this, SplashActivity::class.java)
+        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK)
+        startActivity(intent)
+        finish()
+    }
+}

app/src/main/java/kr/co/vividnext/sodalive/settings/language/LocaleHelper.kt

@@ -0,0 +1,33 @@
+package kr.co.vividnext.sodalive.settings.language
+
+import android.content.Context
+import android.os.Build
+import android.os.LocaleList
+import android.text.TextUtils
+import java.util.Locale
+
+object LocaleHelper {
+    fun wrap(base: Context): Context {
+        val code = LanguageManager.getEffectiveLanguage(base)
+
+        val locale = Locale(code)
+        Locale.setDefault(locale)
+
+        val resources = base.resources
+        val config = resources.configuration
+
+        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            config.setLocale(locale)
+            config.setLocales(LocaleList(locale))
+            base.createConfigurationContext(config)
+        } else {
+            @Suppress("DEPRECATION")
+            run {
+                config.setLocale(locale)
+                @Suppress("DEPRECATION")
+                resources.updateConfiguration(config, resources.displayMetrics)
+                base
+            }
+        }
+    }
+}

app/src/main/res/layout/activity_language_settings.xml

@@ -0,0 +1,138 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@color/black"
+    android:orientation="vertical">
+
+    <include
+        android:id="@+id/toolbar"
+        layout="@layout/detail_toolbar" />
+
+    <ScrollView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical">
+
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginHorizontal="13.3dp"
+                android:layout_marginTop="26.7dp"
+                android:background="@drawable/bg_round_corner_6_7_222222"
+                android:orientation="vertical">
+
+                <RelativeLayout
+                    android:id="@+id/rl_ko"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:paddingVertical="16.7dp"
+                    android:paddingStart="16.7dp"
+                    android:paddingEnd="13.3dp">
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:layout_centerVertical="true"
+                        android:fontFamily="@font/pretendard_bold"
+                        android:text="@string/settings_language_korean"
+                        android:textColor="@color/color_eeeeee"
+                        android:textSize="15sp" />
+
+                    <RadioButton
+                        android:id="@+id/rb_ko"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:layout_alignParentEnd="true"
+                        android:layout_centerVertical="true"
+                        android:buttonTint="@color/color_eeeeee" />
+                </RelativeLayout>
+
+                <View
+                    android:layout_width="match_parent"
+                    android:layout_height="1dp"
+                    android:layout_marginHorizontal="13.3dp"
+                    android:background="@color/color_88909090" />
+
+                <RelativeLayout
+                    android:id="@+id/rl_en"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:paddingVertical="16.7dp"
+                    android:paddingStart="16.7dp"
+                    android:paddingEnd="13.3dp">
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:layout_centerVertical="true"
+                        android:fontFamily="@font/pretendard_bold"
+                        android:text="@string/settings_language_english"
+                        android:textColor="@color/color_eeeeee"
+                        android:textSize="15sp" />
+
+                    <RadioButton
+                        android:id="@+id/rb_en"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:layout_alignParentEnd="true"
+                        android:layout_centerVertical="true"
+                        android:buttonTint="@color/color_eeeeee" />
+                </RelativeLayout>
+
+                <View
+                    android:layout_width="match_parent"
+                    android:layout_height="1dp"
+                    android:layout_marginHorizontal="13.3dp"
+                    android:background="@color/color_88909090" />
+
+                <RelativeLayout
+                    android:id="@+id/rl_ja"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:paddingVertical="16.7dp"
+                    android:paddingStart="16.7dp"
+                    android:paddingEnd="13.3dp">
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:layout_centerVertical="true"
+                        android:fontFamily="@font/pretendard_bold"
+                        android:text="@string/settings_language_japanese"
+                        android:textColor="@color/color_eeeeee"
+                        android:textSize="15sp" />
+
+                    <RadioButton
+                        android:id="@+id/rb_ja"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:layout_alignParentEnd="true"
+                        android:layout_centerVertical="true"
+                        android:buttonTint="@color/color_eeeeee" />
+                </RelativeLayout>
+
+            </LinearLayout>
+
+            <TextView
+                android:id="@+id/tv_apply"
+                android:layout_width="match_parent"
+                android:layout_height="48dp"
+                android:layout_marginHorizontal="13.3dp"
+                android:layout_marginTop="20dp"
+                android:background="@drawable/bg_round_corner_6_7_3bb9f1"
+                android:fontFamily="@font/pretendard_bold"
+                android:gravity="center"
+                android:text="@string/settings_language_apply"
+                android:textAllCaps="false"
+                android:textColor="@color/color_eeeeee"
+                android:textSize="18sp" />
+
+        </LinearLayout>
+    </ScrollView>
+
+</LinearLayout>

app/src/main/res/layout/activity_settings.xml

@@ -86,6 +86,39 @@
                         android:contentDescription="@null"
                         android:src="@drawable/ic_forward" />
                 </RelativeLayout>
+
+                <View
+                    android:id="@+id/divider_language_settings"
+                    android:layout_width="match_parent"
+                    android:layout_height="1dp"
+                    android:layout_marginHorizontal="13.3dp"
+                    android:background="@color/color_88909090" />
+
+                <RelativeLayout
+                    android:id="@+id/rl_language_settings"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:paddingVertical="16.7dp"
+                    android:paddingStart="16.7dp"
+                    android:paddingEnd="13.3dp">
+
+                    <TextView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:layout_centerVertical="true"
+                        android:fontFamily="@font/gmarket_sans_bold"
+                        android:text="@string/screen_settings_language"
+                        android:textColor="@color/color_eeeeee"
+                        android:textSize="14.7sp" />
+
+                    <ImageView
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:layout_alignParentEnd="true"
+                        android:layout_centerVertical="true"
+                        android:contentDescription="@null"
+                        android:src="@drawable/ic_forward" />
+                </RelativeLayout>
             </LinearLayout>
 
             <LinearLayout

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

@@ -87,6 +87,13 @@
     <string name="confirm">OK</string>
     <string name="cancel">Cancel</string>
 
+    <!-- Settings - Language -->
+    <string name="screen_settings_language">Language</string>
+    <string name="settings_language_korean">Korean</string>
+    <string name="settings_language_english">English</string>
+    <string name="settings_language_japanese">Japanese</string>
+    <string name="settings_language_apply">Apply</string>
+
     <!-- Login / Sign up -->
     <string name="title_login">Log in</string>
     <string name="title_signup">Sign up</string>

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

@@ -87,6 +87,13 @@
     <string name="confirm">OK</string>
     <string name="cancel">キャンセル</string>
 
+    <!-- Settings - Language -->
+    <string name="screen_settings_language">言語設定</string>
+    <string name="settings_language_korean">韓国語</string>
+    <string name="settings_language_english">英語</string>
+    <string name="settings_language_japanese">日本語</string>
+    <string name="settings_language_apply">適用</string>
+
     <!-- Login / Sign up -->
     <string name="title_login">ログイン</string>
     <string name="title_signup">新規登録</string>

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

@@ -86,6 +86,13 @@
     <string name="confirm">확인</string>
     <string name="cancel">취소</string>
 
+    <!-- Settings - Language -->
+    <string name="screen_settings_language">언어 설정</string>
+    <string name="settings_language_korean">한국어</string>
+    <string name="settings_language_english">English</string>
+    <string name="settings_language_japanese">日本語</string>
+    <string name="settings_language_apply">적용</string>
+
     <!-- Login / Sign up -->
     <string name="title_login">로그인</string>
     <string name="title_signup">회원가입</string>