Change app language programmatically in Android

Question

Is it possible to change the language of an app programmatically while still using Android resources   If not  is it possible to request a resource in an specific language   I would like to let the user change the language of the app from the app

User · Answer

This code really works      fa   Persian  en   English   Enter your language code in languageToLoad variable   import android app Activity  import android content res Configuration  import android os Bundle   public class Main extends Activity         Called when the activity is first created        Override   public void onCreate Bundle savedInstanceState        super onCreate savedInstanceState        String languageToLoad     fa      your language     Locale locale   new Locale languageToLoad        Locale setDefault locale       Configuration config   new Configuration        config locale   locale      getBaseContext   getResources   updateConfiguration config         getBaseContext   getResources   getDisplayMetrics         this setContentView R layout main

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According to this article  You will need to download LocaleHelper java referenced in that article    Create MyApplication class that will extends Application  Override attachBaseContext   to update language  Register this class in manifest    public class MyApplication extends Application       Override    protected void attachBaseContext Context base        super attachBaseContext LocaleHelper onAttach base   en              lt application      android name  com package MyApplication            gt   Create BaseActivity and override onAttach   to update language  Needed for Android 6    public class BaseActivity extends Activity      Override   protected void attachBaseContext Context base        super attachBaseContext LocaleHelper onAttach base           Make all activities on your app extends from BaseActivity   public class LocaleHelper    private static final String SELECTED LANGUAGE    Locale Helper Selected Language    public static Context onAttach Context context        String lang   getPersistedData context  Locale getDefault   getLanguage         return setLocale context  lang      public static Context onAttach Context context  String defaultLanguage        String lang   getPersistedData context  defaultLanguage       return setLocale context  lang      public static String getLanguage Context context        return getPersistedData context  Locale getDefault   getLanguage        public static Context setLocale Context context  String language        persist context  language        if  Build VERSION SDK INT  gt   Build VERSION CODES N            return updateResources context  language              return updateResourcesLegacy context  language      private static String getPersistedData Context context  String defaultLanguage        SharedPreferences preferences   PreferenceManager getDefaultSharedPreferences context       return preferences getString SELECTED LANGUAGE  defaultLanguage      private static void persist Context context  String language        SharedPreferences preferences   PreferenceManager getDefaultSharedPreferences context       SharedPreferences Editor editor   preferences edit         editor putString SELECTED LANGUAGE  language       editor apply        TargetApi Build VERSION CODES N  private static Context updateResources Context context  String language        Locale locale   new Locale language       Locale setDefault locale        Configuration configuration   context getResources   getConfiguration        configuration setLocale locale       configuration setLayoutDirection locale        return context createConfigurationContext configuration       SuppressWarnings  deprecation   private static Context updateResourcesLegacy Context context  String language        Locale locale   new Locale language       Locale setDefault locale        Resources resources   context getResources         Configuration configuration   resources getConfiguration        configuration locale   locale      if  Build VERSION SDK INT  gt   Build VERSION CODES JELLY BEAN MR1            configuration setLayoutDirection locale              resources updateConfiguration configuration  resources getDisplayMetrics          return context

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Just adding an extra piece that tripped me up   While the other answers work fine with  de  for example  String lang    de   Locale locale   new Locale lang    Locale setDefault locale   Configuration config   new Configuration    config locale   locale  getBaseContext   getResources   updateConfiguration config       getBaseContext   getResources   getDisplayMetrics       The above wont work with for example  fr BE  locale so it would use the values-fr-rBE folder or similar    Needs the following slight change to work with  fr BE   String lang    fr      create a string for country String country    BE     use constructor with country Locale locale   new Locale lang  country    Locale setDefault locale   Configuration config   new Configuration    config locale   locale  getBaseContext   getResources   updateConfiguration config       getBaseContext   getResources   getDisplayMetrics

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I know it s late to answer but i found this article here   Which explains the whole process very well and provides you a well structured code   Locale Helper class   import android annotation TargetApi  import android content Context  import android content SharedPreferences  import android content res Configuration  import android content res Resources  import android os Build  import android preference PreferenceManager   import java util Locale          This class is used to change your application locale and persist this change for the next time    that your app is going to be used      lt p  gt     You can also change the locale of your application on the fly by using the setLocale method      lt p  gt     Created by gunhansancar on 07 10 15      public class LocaleHelper        private static final String SELECTED LANGUAGE    Locale Helper Selected Language        public static Context onAttach Context context            String lang   getPersistedData context  Locale getDefault   getLanguage             return setLocale context  lang              public static Context onAttach Context context  String defaultLanguage            String lang   getPersistedData context  defaultLanguage           return setLocale context  lang              public static String getLanguage Context context            return getPersistedData context  Locale getDefault   getLanguage                public static Context setLocale Context context  String language            persist context  language            if  Build VERSION SDK INT  gt   Build VERSION CODES N                return updateResources context  language                      return updateResourcesLegacy context  language              private static String getPersistedData Context context  String defaultLanguage            SharedPreferences preferences   PreferenceManager getDefaultSharedPreferences context           return preferences getString SELECTED LANGUAGE  defaultLanguage              private static void persist Context context  String language            SharedPreferences preferences   PreferenceManager getDefaultSharedPreferences context           SharedPreferences Editor editor   preferences edit             editor putString SELECTED LANGUAGE  language           editor apply                TargetApi Build VERSION CODES N      private static Context updateResources Context context  String language            Locale locale   new Locale language           Locale setDefault locale            Configuration configuration   context getResources   getConfiguration            configuration setLocale locale           configuration setLayoutDirection locale            return context createConfigurationContext configuration               SuppressWarnings  deprecation       private static Context updateResourcesLegacy Context context  String language            Locale locale   new Locale language           Locale setDefault locale            Resources resources   context getResources             Configuration configuration   resources getConfiguration            configuration locale   locale          if  Build VERSION SDK INT  gt   Build VERSION CODES JELLY BEAN MR1                configuration setLayoutDirection locale                      resources updateConfiguration configuration  resources getDisplayMetrics              return context            You need to override attachBaseContext and call LocaleHelper onAttach   to initialize the locale settings in your application   import android app Application  import android content Context   import com gunhansancar changelanguageexample helper LocaleHelper   public class MainApplication extends Application        Override     protected void attachBaseContext Context base            super attachBaseContext LocaleHelper onAttach base   en               All you have to do is to add       LocaleHelper onCreate this   en      wherever you want to change the locale

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Locale locale   new Locale  en    Locale setDefault locale    Configuration config   context getResources   getConfiguration    config setLocale locale   context createConfigurationContext config     Important update   context getResources   updateConfiguration config  context getResources   getDisplayMetrics       Note  that on SDK    21  you need to call  Resources updateConfiguration     otherwise resources will not be updated

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Just handle in method    Override public void onConfigurationChanged android content res Configuration newConfig     Follow the Link  I think it is useful

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None of the solutions listed here helped me    The language did not switch on android    7 0 if AppCompatDelegate setDefaultNightMode AppCompatDelegate MODE NIGHT YES   This LocaleUtils works just fine  https   gist github com GigigoGreenLabs 7d555c762ba2d3a810fe  LocaleUtils  public class LocaleUtils    public static final String LAN SPANISH         es   public static final String LAN PORTUGUESE      pt   public static final String LAN ENGLISH         en    private static Locale sLocale   public static void setLocale Locale locale        sLocale   locale      if sLocale    null            Locale setDefault sLocale            public static void updateConfig ContextThemeWrapper wrapper        if sLocale    null  amp  amp  Build VERSION SDK INT  gt   Build VERSION CODES JELLY BEAN MR1            Configuration configuration   new Configuration            configuration setLocale sLocale           wrapper applyOverrideConfiguration configuration            public static void updateConfig Application app  Configuration configuration        if sLocale    null  amp  amp  Build VERSION SDK INT  lt  Build VERSION CODES JELLY BEAN MR1              Wrapping the configuration to avoid Activity endless loop         Configuration config   new Configuration configuration           config locale   sLocale          Resources res   app getBaseContext   getResources            res updateConfiguration config  res getDisplayMetrics                 Added this code to Application  public class App extends Application   public void onCreate        super onCreate         LocaleUtils setLocale new Locale  iw         LocaleUtils updateConfig this  getBaseContext   getResources   getConfiguration         Override public void onConfigurationChanged Configuration newConfig        super onConfigurationChanged newConfig       LocaleUtils updateConfig this  newConfig         Code in Activity  public class BaseActivity extends AppCompatActivity       public BaseActivity             LocaleUtils updateConfig this

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For Arabic RTL support   You must update your language settings through - attachBaseContext    For android version N and above you must use createConfigurationContext    amp  updateConfiguration   - else RTL layout not working properly    x000D   x000D    Override x000D      protected void attachBaseContext Context newBase    x000D          super attachBaseContext updateBaseContextLocale newBase    x000D        x000D   x000D      public Context updateBaseContextLocale Context context    x000D          String language   SharedPreference getInstance   getValue context   lan     it return  en    ar  like this x000D          if  language    null    language isEmpty      x000D                when first time enter into app  get the device language and set it x000D              language   Locale getDefault   getLanguage    x000D              if  language equals  ar      x000D                  SharedPreference getInstance   save mContext   lan    ar    x000D                x000D            x000D          Locale locale   new Locale language   x000D          Locale setDefault locale   x000D   x000D          if  Build VERSION SDK INT  gt   Build VERSION CODES N    x000D              updateResourcesLocale context  locale   x000D              return  updateResourcesLocaleLegacy context  locale   x000D            x000D   x000D          return updateResourcesLocaleLegacy context  locale   x000D        x000D   x000D       TargetApi Build VERSION CODES N  x000D      private Context updateResourcesLocale Context context  Locale locale    x000D          Configuration configuration   context getResources   getConfiguration    x000D          configuration setLocale locale   x000D          return context createConfigurationContext configuration   x000D        x000D   x000D       SuppressWarnings  deprecation   x000D      private Context updateResourcesLocaleLegacy Context context  Locale locale    x000D          Resources resources   context getResources    x000D          Configuration configuration   resources getConfiguration    x000D          configuration locale   locale  x000D          resources updateConfiguration configuration  resources getDisplayMetrics     x000D          return context  x000D        x000D   x000D   x000D

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It s possible  You can set the locale  However  I would not recommend that  We ve tried it at early stages  it s basically fighting the system  We have the same requirement for changing the language but decided to settle to the fact that UI should be same as phone UI  It was working via setting locale but was too buggy  And you have to set it every time you enter activity  each activity  from my experience  here is a code if you still need this  again  I don t recommend that  Resources res   context getResources       Change locale settings in the app  DisplayMetrics dm   res getDisplayMetrics    android content res Configuration conf   res getConfiguration    conf setLocale new Locale language code toLowerCase         API 17  only     Use conf locale   new Locale      if targeting lower versions res updateConfiguration conf  dm    If you have language specific content - you can change that base on the setting   update on 26th of march 2020     public static void setLocale Activity activity  String languageCode            Locale locale   new Locale languageCode           Locale setDefault locale           Resources resources   activity getResources            Configuration config   resources getConfiguration            config setLocale locale           resources updateConfiguration config  resources getDisplayMetrics

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Alex Volovoy answer only works for me if it s in onCreate method of the activity   The answer that works in all the methods is in another thread   Change language programmatically in Android  Here is the adaptation of the code        Resources standardResources   getBaseContext   getResources         AssetManager assets   standardResources getAssets         DisplayMetrics metrics   standardResources getDisplayMetrics         Configuration config   new Configuration standardResources getConfiguration          config locale   new Locale languageToLoad        Resources defaultResources   new Resources assets  metrics  config      Hope that it helps

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I am changed for German language for my app start itself   Here is my correct code  Anyone want use this same for me    How to change language in android programmatically   my code   Configuration config      variable declaration in globally     this part is given inside onCreate Method starting and before setContentView    public void onCreate Bundle icic         super onCreate icic       config   new Configuration getResources   getConfiguration         config locale   Locale GERMAN       getResources   updateConfiguration config getResources   getDisplayMetrics          setContentView R layout newdesign

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If you write   android configChanges  locale    In every activity  in the manifest file  then no need to set it every time you enter Activity

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I encountered the same problem  I needed to set my language to a language chosen in my app   My fix was this    Keep your strings in your XML file  don t extract it to resources Make an exact copy of your XML and rename it to  languagecode  like  fr  use lowercase   Fix your translations in your XML copy In code you check your app-level language and inflate the relevant XML   Example    String languageInitials   MyAppconfig currentLanguageInitials            if  languageInitials equals  NL                  view   inflater inflate R layout mylayout nl  container  false             else               view   inflater inflate R layout fragment mylayout fr  container  false               From these XML s  you can still extract the needed strings to resources

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Create a class Extends Application and create a static method  Then you can call this method in all activities before setContentView     public class MyApp extends Application     Override public void onCreate         super onCreate       public static void setLocaleFa  Context context       Locale locale   new Locale  fa         Locale setDefault locale       Configuration config   new Configuration        config locale   locale      context getApplicationContext   getResources   updateConfiguration config  null      public static void setLocaleEn  Context context       Locale locale   new Locale  en US         Locale setDefault locale       Configuration config   new Configuration        config locale   locale      context getApplicationContext   getResources   updateConfiguration config  null          Usage in activities    Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       MyApp setLocaleFa MainActivity this       requestWindowFeature Window FEATURE NO TITLE       setContentView R layout activity main

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Add LocaleHelper class  public class LocaleHelper   private static final String SELECTED LANGUAGE    Locale Helper Selected Language   public static Context onAttach Context context        String lang   getPersistedData context  Locale getDefault   getLanguage         return setLocale context  lang      public static Context onAttach Context context  String defaultLanguage        String lang   getPersistedData context  defaultLanguage       return setLocale context  lang      public static String getLanguage Context context        return getPersistedData context  Locale getDefault   getLanguage       public static Context setLocale Context context  String language        persist context  language        if  Build VERSION SDK INT  gt   Build VERSION CODES N            return updateResources context  language              return updateResourcesLegacy context  language      private static String getPersistedData Context context  String defaultLanguage        SharedPreferences preferences   PreferenceManager getDefaultSharedPreferences context       return preferences getString SELECTED LANGUAGE  defaultLanguage      private static void persist Context context  String language        SharedPreferences preferences   PreferenceManager getDefaultSharedPreferences context       SharedPreferences Editor editor   preferences edit         editor putString SELECTED LANGUAGE  language       editor apply        TargetApi Build VERSION CODES N  private static Context updateResources Context context  String language        Locale locale   new Locale language       Locale setDefault locale        Configuration configuration   context getResources   getConfiguration        configuration setLocale locale       configuration setLayoutDirection locale        return context createConfigurationContext configuration       SuppressWarnings  deprecation   private static Context updateResourcesLegacy Context context  String language        Locale locale   new Locale language       Locale setDefault locale        Resources resources   context getResources         Configuration configuration   resources getConfiguration        configuration locale   locale      if  Build VERSION SDK INT  gt   Build VERSION CODES JELLY BEAN MR1            configuration setLayoutDirection locale              resources updateConfiguration configuration  resources getDisplayMetrics          return context        In Activity or Fragment  Context context   LocaleHelper setLocale this  App getSharedPre   getLanguage     Resource resources   context getResources      Now SetText on every text  TextView tv   findViewById R id tv   tv setText resources getString R string tv

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First you create directory name values- Language name  like  hindi than write  hi  and same string file name copy in this directory and change value do not change parameter after set below code in your action like button etc      Locale myLocale   new Locale  hi    Resources res   getResources    DisplayMetrics dm   res getDisplayMetrics    Configuration conf   res getConfiguration    conf locale   myLocale  res updateConfiguration conf  dm   Intent refresh   new Intent Home this  Home class   startActivity refresh   finish

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Kotlin version of solution private fun setLocale activity  Activity  languageCode  String         val locale   Locale languageCode      Locale setDefault locale      val config  Configuration   resources configuration     config setLocale locale      resources updateConfiguration config  resources displayMetrics   See this answer for list of the language codes https   stackoverflow com a 7989085 13139418

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change language at Run-time     use method like that    setLocale  en     public void setLocale String lang       myLocale   new Locale lang              Resources res   getResources               DisplayMetrics dm   res getDisplayMetrics               Configuration conf   res getConfiguration               conf locale   myLocale             res updateConfiguration conf  dm              Intent refresh   new Intent this  AndroidLocalize class              startActivity refresh

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I finally figured out how to setup it to work on both  N android versions  Extend AppCompatActivity with your own abstract class  like  abstract class MLAppCompatActivity   AppCompatActivity       override fun attachBaseContext newBase  Context         super attachBaseContext LocaleHelper wrap newBase          override fun onCreate savedInstanceState  Bundle         super onCreate savedInstanceState      if  Build VERSION SDK INT  lt  Build VERSION CODES N            LocaleHelper wrap this               attachBaseContext is called on Android  gt  N versions and on this way activity will use the correct context  On Android  lt N  we have to call this function on one other way  before setting content view  Therefore we override onCreate function to set correct context  Means  whenever you create a new Activity you have to extend your abstract class  Like this one  class TermsActivity   MLAppCompatActivity       override fun onCreate savedInstanceState  Bundle         super onCreate savedInstanceState      setContentView R layout activity terms         And finally the LocaleHelper is like this  import android annotation TargetApi  import android content Context  import android content ContextWrapper  import android content SharedPreferences  import android content res Configuration  import android content res Resources  import android os Build  import android util DisplayMetrics   import com at zone constants SharedPreferencesKeys   import java util Locale   public class LocaleHelper extends ContextWrapper        public LocaleHelper Context base            super base              public static Context wrap Context context            SharedPreferences sharedPreferences   context getSharedPreferences                  SharedPreferencesKeys SHARED PREFERENCES  Context MODE PRIVATE                    String language   sharedPreferences getString SharedPreferencesKeys CURRENT LANGUAGE   quot default quot            if   language equals  quot default quot                  Configuration config   context getResources   getConfiguration                if   language equals  quot  quot                      Locale locale   new Locale language                   Locale setDefault locale                   if  Build VERSION SDK INT  gt   Build VERSION CODES N                        setSystemLocale config  locale                     else                       setSystemLocaleLegacy context  config  locale                                     config setLayoutDirection locale                   context   context createConfigurationContext config                             return new LocaleHelper context                     return context             public static String getSystemLanguage Context context            if  Build VERSION SDK INT  gt   Build VERSION CODES N                return getSystemLocale context  getLanguage   toLowerCase              else               return getSystemLocaleLegacy context  getLanguage   toLowerCase                         public static Locale getSystemLocaleLegacy Context context            Configuration config   context getResources   getConfiguration            return config locale              TargetApi Build VERSION CODES N      public static Locale getSystemLocale Context context            return context getResources   getConfiguration   getLocales   get 0              public static void setSystemLocaleLegacy Context context  Configuration config  Locale locale            config locale   locale          Resources res   context getResources            DisplayMetrics dm   res getDisplayMetrics            res updateConfiguration config  dm               TargetApi Build VERSION CODES N      public static void setSystemLocale Configuration config  Locale locale            config setLocale locale

User · Answer

For Android 7 0 Nougat  and lower  follow this article   Change Language Programatically in Android    Old answer This include RTL LTR support   public static void changeLocale Context context  Locale locale        Configuration conf   context getResources   getConfiguration        conf locale   locale      Locale setDefault locale        if  Build VERSION SDK INT  gt   Build VERSION CODES JELLY BEAN MR1           conf setLayoutDirection conf locale              context getResources   updateConfiguration conf  context getResources   getDisplayMetrics

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If you want to mantain the language changed over all your app you have to do two things   First  create a base Activity and make all your activities extend from this   public class BaseActivity extends AppCompatActivity        private Locale mCurrentLocale        Override     protected void onStart             super onStart             mCurrentLocale   getResources   getConfiguration   locale              Override     protected void onRestart             super onRestart            Locale locale   getLocale this            if   locale equals mCurrentLocale                  mCurrentLocale   locale              recreate                         public static Locale getLocale Context context           SharedPreferences sharedPreferences   PreferenceManager getDefaultSharedPreferences context            String lang   sharedPreferences getString  language    en            switch  lang                case  English                   lang    en                   break              case  Spanish                   lang    es                   break                    return new Locale lang             Note that I save the new language in a sharedPreference   Second  create an extension of Application like this       public class App extends Application         Override     public void onCreate             super onCreate            setLocale                Override     public void onConfigurationChanged Configuration newConfig            super onConfigurationChanged newConfig           setLocale               private void setLocale              final Resources resources   getResources            final Configuration configuration   resources getConfiguration            final Locale locale   getLocale this           if   configuration locale equals locale                 configuration setLocale locale               resources updateConfiguration configuration  null                       Note that getLocale   it s the same as above   That s all  I hope this can help somebody

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Here is some code that works for me   public class  MainActivity extends AppCompatActivity       public static String storeLang        Override     protected void onCreate Bundle savedInstanceState             SharedPreferences shp   PreferenceManager getDefaultSharedPreferences this           storeLang   shp getString getString R string key lang                    Create a new Locale object         Locale locale   new Locale storeLang               Create a new configuration object         Configuration config   new Configuration               Set the locale of the new configuration         config locale   locale             Update the configuration of the Accplication context         getResources   updateConfiguration                  config                  getResources   getDisplayMetrics                       super onCreate savedInstanceState           setContentView R layout activity main             Source  here

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If someone looking for disable language at compile time  here is the solution  android       defaultConfig           resConfigs  quot en quot           This isn t just for disabling localisation   resConfigs simply tells the build system which resources to keep  You can check original answer here

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Locale configuration should be set in each activity before setting the content - this setContentView R layout main

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At first create multi string xml for different languages  then use this block of code in onCreate   method   super onCreate savedInstanceState   String languageToLoad     fr      change your language here Locale locale   new Locale languageToLoad    Locale setDefault locale   Configuration config   new Configuration    config locale   locale  getBaseContext   getResources   updateConfiguration config     getBaseContext   getResources   getDisplayMetrics     this setContentView R layout main

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This is working when i press button to change text language of my TextView  strings xml in values-de folder   String languageToLoad    de      your language Configuration config   getBaseContext   getResources   getConfiguration    Locale locale   new Locale languageToLoad   Locale setDefault locale   config locale   locale  getBaseContext   getResources   updateConfiguration config  getBaseContext   getResources   getDisplayMetrics     recreate

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private void setLanguage String language        Locale locale   new Locale language       Locale setDefault locale       Configuration config   new Configuration        if  Build VERSION SDK INT  gt   Build VERSION CODES JELLY BEAN MR1            config setLocale locale         else           config locale   locale            getResources   updateConfiguration config              getResources   getDisplayMetrics

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Take note that this solution using updateConfiguration will not be working anymore with the Android M release coming in a few weeks  The new way to do this is now using the applyOverrideConfigurationmethod from ContextThemeWrapper see API doc  You can find my full solution here since I faced the problem myself  https   stackoverflow com a 31787201 2776572

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There are some steps that you should implement  First  you need to change the locale of your configuration  Resources resources   context getResources     Configuration configuration   resources getConfiguration    configuration locale   new Locale language    resources updateConfiguration configuration  resources getDisplayMetrics       Second  if you want your changes to apply directly to the layout that is visible  you either can update the views directly or you can just call activity recreate   to restart the current activity   And also you have to persist your changes because after user closes your application then you would lose the language change   I explained more detailed solution on my blog post Change Language Programmatically in Android  Basically  you just call LocaleHelper onCreate   on your application class and if you want to change locale on the fly you can call LocaleHelper setLocale

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similar to the accepted answered but 2017 version and added restart  without restarting  sometimes the next Activity still renders English         Inside some activity    private void changeDisplayLanguage String langCode       Step 1  Change the locale in the app s configuration     Resources res   getResources        android content res Configuration conf   res getConfiguration        conf setLocale currentLocale       createConfigurationContext conf      Step 2  IMPORTANT  you must restart the app to make sure it works 100      restart      private void restart         PackageManager packageManager   getPackageManager        Intent intent   packageManager getLaunchIntentForPackage getPackageName         ComponentName componentName   intent getComponent        Intent mainIntent   IntentCompat makeRestartActivityTask componentName       mainIntent putExtra  app restarting   true       PrefUtils putBoolean  app restarting   true       startActivity mainIntent       System exit 0

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I was looking for a way to change the system language programmatically  While I fully understand that a normal application should never do that and instead either    the user should be pointed through an intent  to the system settings to change it manually the application should handle its localization on its own just like described in the answer of Alex   there was a need to really change the language of the system programmtically   This is undocumented API and thus should not be used for market end-user applications   Anyway heres the solution i found     Locale locale   new Locale targetLocaleAsString      Class amnClass   Class forName  android app ActivityManagerNative      Object amn   null    Configuration config   null        amn   ActivityManagerNative getDefault      Method methodGetDefault   amnClass getMethod  getDefault      methodGetDefault setAccessible true     amn   methodGetDefault invoke amnClass         config   amn getConfiguration      Method methodGetConfiguration   amnClass getMethod  getConfiguration      methodGetConfiguration setAccessible true     config    Configuration  methodGetConfiguration invoke amn         config userSetLocale   true    Class configClass   config getClass      Field f   configClass getField  userSetLocale      f setBoolean config  true         set the locale to the new value   config locale   locale        amn updateConfiguration config     Method methodUpdateConfiguration   amnClass getMethod  updateConfiguration   Configuration class     methodUpdateConfiguration setAccessible true     methodUpdateConfiguration invoke amn  config

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https   stackoverflow com a 48531811 9609776 This is ok but do not split the updateResources into different versions  just use the solution below  kotlin   Key is in  quot Configuration context resources configuration  quot  it makes deep copy  100  solution for API 21   I have not tested for lower ones  but should work  private fun updateResources context  Context  language  String   Context       return Configuration context resources configuration  run           Locale setDefault Locale language  also   locale - gt              setLocale locale             let               context createConfigurationContext this

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For me the best solution is this one  https   www bitcaal com how-to-change-the-app-language-programmatically-in-android  package me mehadih multiplelanguage   import androidx appcompat app AppCompatActivity   import android content res Configuration  import android content res Resources  import android os Build  import android os Bundle  import android util DisplayMetrics   import java util Locale   public class MainActivity extends AppCompatActivity         Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setApplicationLocale  quot az quot       short name of language   quot en quot  for English         setContentView R layout activity main               private void setApplicationLocale String locale            Resources resources   getResources            DisplayMetrics dm   resources getDisplayMetrics            Configuration config   resources getConfiguration            if  Build VERSION SDK INT  gt   Build VERSION CODES JELLY BEAN MR1                config setLocale new Locale locale toLowerCase                else               config locale   new Locale locale toLowerCase                       resources updateConfiguration config  dm

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In example we set English language    Configuration config   GetBaseContext   getResources   getConfiguration     Locale locale   new Locale  en     Locale setDefault locale    config locale   locale   GetBaseContext   getResources   updateConfiguration config               GetBaseContext   getResources   getDisplayMetrics       Please  remember this works only if language is found in Device system also  not only in application

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I was facing the same issue  On GitHub I found the Android-LocalizationActivity library    This library makes it very simple to change the language of your app at runtime  as you can see in the code sample below  A sample project including the sample code below and more information can be found at the github page   The LocalizationActivity extends AppCompatActivity  so you can also use it when you are using Fragments   public class MainActivity extends LocalizationActivity implements View OnClickListener         Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity simple            findViewById R id btn th  setOnClickListener this           findViewById R id btn en  setOnClickListener this               Override     public void onClick View v            int id   v getId            if  id    R id btn en                setLanguage  en              else if  id    R id btn th                setLanguage  th

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The only solution that fully works for me is a combination of Alex Volovoy s code with application restart mechanism   void restartApplication         Intent i   new Intent MainTabActivity context  MagicAppRestart class       i setFlags Intent FLAG ACTIVITY CLEAR TOP       i addFlags Intent FLAG ACTIVITY NEW TASK       MainTabActivity context startActivity i           This activity shows nothing  instead  it restarts the android process    public class MagicAppRestart extends Activity        Override     protected void onActivityResult int requestCode  int resultCode  Intent data            super onActivityResult requestCode  resultCode  data           finish               protected void onResume             super onResume            startActivityForResult new Intent this  MainTabActivity class   0

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Time for a due update   First off  the deprecated list with the API in which it was deprecated    configuration locale  API 17  updateConfiguration configuration  displaymetrics   API 17    The thing no question answered recently has gotten right is the usage of the new method   createConfigurationContext is the new method for updateConfiguration   Some have used it standalone like this   Configuration overrideConfiguration   ctx getResources   getConfiguration    Locale locale   new Locale  en US    overrideConfiguration setLocale locale   createConfigurationContext overrideConfiguration         but that doesn t work  Why  The method returns a context  which then is used to handle Strings xml translations and other localized resources  images  layouts  whatever    The proper usage is like this   Configuration overrideConfiguration   ctx getResources   getConfiguration    Locale locale   new Locale  en US    overrideConfiguration setLocale locale     the configuration can be used for other stuff as well Context context    createConfigurationContext overrideConfiguration   Resources resources   context getResources      If you just copy-pasted that into your IDE  you may see a warning that the API requires you targeting API 17 or above  This can be worked around by putting it in a method and adding the annotation  TargetApi 17   But wait  What about the older API s   You need to create another method using updateConfiguration without the TargetApi annotation   Resources res   YourApplication getInstance   getResources       Change locale settings in the app  DisplayMetrics dm   res getDisplayMetrics    android content res Configuration conf   res getConfiguration    conf locale   new Locale  th    res updateConfiguration conf  dm     You don t need to return a context here   Now  managing these can be difficult  In API 17  you need the context created  or the resources from the context created  to get the appropriate resources based on localization  How do you handle this   Well  this is the way I do it          Full locale list  https   stackoverflow com questions 7973023 what-is-the-list-of-supported-languages-locales-on-android     param lang language code  e g  en US      return the context    PLEASE READ  This method can be changed for usage outside an Activity  Simply add a COntext to the arguments     public Context setLanguage String lang    Context c         Context c   AndroidLauncher this   remove if the context argument is passed  This is a utility line  can be removed totally by replacing calls to c with the activity  if argument Context isn t passed      int API   Build VERSION SDK INT      if API  gt   17           return setLanguage17 lang  c        else          return setLanguageLegacy lang  c                   Set language for API 17     param lang     param c     return      TargetApi 17  public Context setLanguage17 String lang  Context c       Configuration overrideConfiguration   c getResources   getConfiguration        Locale locale   new Locale lang       Locale setDefault locale       overrideConfiguration setLocale locale         the configuration can be used for other stuff as well     Context context    createConfigurationContext overrideConfiguration     local variable is redundant  if the below line is uncommented  it is needed       Resources resources   context getResources     If you want to pass the resources instead of a Context  uncomment this line and put it somewhere useful     return context     public Context setLanguageLegacy String lang  Context c       Resources res   c getResources           Change locale settings in the app      DisplayMetrics dm   res getDisplayMetrics     Utility line     android content res Configuration conf   res getConfiguration         conf locale   new Locale lang    setLocale requires API 17  - just like createConfigurationContext     Locale setDefault conf locale       res updateConfiguration conf  dm          Using this method you don t need to modify the Context itself  Setting it at the start of the app is enough  As you       target both API s though  you want to return the context as you have no clue what is called  Now you can use the Context       supplied for both things     return c      This code works by having one method that makes calls to the appropriate method based on what API  This is something I have done with a lot of different deprecated calls  including Html fromHtml   You have one method that takes in the arguments needed  which then splits it into one of two  or three or more  methods and returns the appropriate result based on API level  It is flexible as you do t have to check multiple times  the  entry  method does it for you  The entry-method here is setLanguage  PLEASE READ THIS BEFORE USING IT  You need to use the Context returned when you get resources  Why  I have seen other answers here who use createConfigurationContext and doesn t use the context it returns  To get it to work like that  updateConfiguration has to be called  Which is deprecated  Use the context returned by the method to get resources   Example usage   Constructor or somewhere similar   ctx   getLanguage lang    lang is loaded or generated  How you get the String lang is not something this answer handles  nor will handle in the future    And then  whereever you want to get resources you do   String fromResources   ctx getString R string helloworld     Using any other context will  in theory  break this   AFAIK you still have to use an activity context to show dialogs or Toasts  for that you can use an instance of an activity  if you are outside     And finally  use recreate   on the activity to refresh the content  Shortcut to not have to create an intent to refresh

[android] Change app language programmatically in Android

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