I have an app with string ressources for German and English. I defined a separate Fragment for chaging the laguage that you can see here
public class FR_Options extends Fragment implements View.OnClickListener { /* String specifying the language of the App */ public static final String LANGUAGE_GERMAN = "German"; public static final String LANGUAGE_ENGLISH = "English"; //Set the default language to GERMAN public static String currentLanguageOfTheApp = LANGUAGE_ENGLISH; public FR_Options() { // Required empty public constructor } public static FR_Options newInstance(String param1, String param2) { FR_Options fragment = new FR_Options(); return fragment; } @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR1) @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); } private FragmentOptionsBinding binding; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { // Inflate the layout for this fragment binding = FragmentOptionsBinding.inflate(inflater, container, false); return binding.getRoot(); } @Override public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); binding.imageButtonGermany.setOnClickListener(this); binding.imageButtonUK.setOnClickListener(this); if(currentLanguageOfTheApp.equals(LANGUAGE_ENGLISH)) { binding.textViewCurrentLanguageValue.setText(LANGUAGE_ENGLISH); binding.imageButtonGermany.setAlpha(0.5f); binding.imageButtonUK.setAlpha(1.0f); } if(currentLanguageOfTheApp.equals(LANGUAGE_GERMAN)) { binding.textViewCurrentLanguageValue.setText(LANGUAGE_GERMAN); binding.imageButtonGermany.setAlpha(1.0f); binding.imageButtonUK.setAlpha(0.5f); } } public void onDestroyView() { super.onDestroyView(); binding = null; } @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR1) @Override public void onClick(View view) { if(view.getId() == R.id.imageButtonGermany) { /* Set the language to "German" for other fragments and database queries */ this.currentLanguageOfTheApp = LANGUAGE_GERMAN; /* Set the language to "German" for the XML-layout files */ Locale locale; locale = new Locale("de", "DE"); Configuration config = new Configuration(getActivity().getBaseContext().getResources().getConfiguration()); Locale.setDefault(locale); config.setLocale(locale); getActivity().recreate(); getActivity().getBaseContext().getResources().updateConfiguration(config, getActivity().getBaseContext().getResources().getDisplayMetrics()); } if(view.getId() == R.id.imageButtonUK) { /* Set the language to "English" for other fragments and database queries */ this.currentLanguageOfTheApp = LANGUAGE_ENGLISH; /* Set the language to "English" for the XML-layout files */ Locale locale; locale = new Locale("en", "EN"); Configuration config = new Configuration(getActivity().getBaseContext().getResources().getConfiguration()); Locale.setDefault(locale); config.setLocale(locale); getActivity().recreate(); getActivity().getBaseContext().getResources().updateConfiguration(config, getActivity().getBaseContext().getResources().getDisplayMetrics()); } }}Now when I navigate to a Test fragment whose Java file looks like this
public class Test extends Fragment { int widthDisplay; int heightDisplay; private FragmentTestBinding binding; private ConstraintLayout constraintLayout; ConstraintSet constraintSet ; private boolean fragmentViewHasBeenCreated = false; int helpUpdateCounterProgressBar = 0;//Just for testing boolean animationIsWindBladRotating = false; private boolean sunIsShiningForImagewViews = false; private boolean helpSolarGameRectangleCorrectlyCaughtPreviously = false; public Test() { // Required empty public constructor } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { binding = FragmentTestBinding.inflate(inflater, container, false); WindowManager wm = (WindowManager) getActivity().getWindowManager(); Display display = wm.getDefaultDisplay(); Point size = new Point(); display.getSize(size); widthDisplay = size.x; heightDisplay = size.y; //Test to set the string resources programmatically String goalText = getString(R.string.goal); String timeText = getString(R.string.time); binding.textViewGoal.setText(goalText); binding.textView3.setText(timeText); container.getContext(); constraintLayout= binding.constraintLayout; fragmentViewHasBeenCreated = true; getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); constraintLayout = binding.constraintLayout; constraintSet = new ConstraintSet(); return binding.getRoot(); }//end onCreateView @Override public void onDestroyView() { super.onDestroyView(); // Reset your variable to false fragmentViewHasBeenCreated = false; }}with the corrsponding xml layout file
<?xml version="1.0" encoding="utf-8"?><androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/constraintLayout" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/white" tools:context=".MainActivity"><TextView android:id="@+id/textView_Goal" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/goal" android:textSize="24dp" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /><TextView android:id="@+id/textView3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/time" android:textSize="24dp" app:layout_constraintEnd_toEndOf="@+id/textView_Goal" app:layout_constraintStart_toStartOf="@+id/textView_Goal" app:layout_constraintTop_toBottomOf="@+id/textView_Goal" /></androidx.constraintlayout.widget.ConstraintLayout>The laguages of the string ressources android:text="@string/time" and android:text="@string/goal" never change and always remain English which is the default language.
In the folder values/string/strings.xml there are the two entries
" <string name="goal">Goal</string><string name="time">Time</string>"while in the folder values/string/strings.mxl (de-rDE) there are the two entries "
<string name="goal">Ziel</string> <string name="time">Zeit</string>"still the laguage is not changes in the Test class no matter what I do in the FR_Options fragment class.
Update: I found out that when changing the language in the FR_Options class and I navigate back to my FR_Menu class which looks like this
public class FR_Menu extends Fragment implements View.OnClickListener{ private FragmentMenuBinding binding; public FR_Menu() { } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { binding = FragmentMenuBinding.inflate(inflater, container, false); getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); binding.buttonGame.setOnClickListener(this); binding.buttonOptions.setOnClickListener(this); binding.buttonHighscores.setOnClickListener(this); binding.buttonFacts.setOnClickListener(this); binding.buttonExit.setOnClickListener(this); binding.buttonTest.setOnClickListener(this); Log.e("LogTag_Menu", "Method onCreateView - this: " + this); return binding.getRoot(); } @Override public void onClick(View view) { if(view.getId() == R.id.button_game) { Navigation.findNavController(getView()).navigate(FR_MenuDirections.actionFRMenuToFRGame()); } if(view.getId() == R.id.button_highscores) { Navigation.findNavController(getView()).navigate(FR_MenuDirections.actionFRMenuToFRHighScores()); } if(view.getId() == R.id.button_facts) { //Navigation.findNavController(getView()).navigate(FR_MenuDirections.actionFRMenuToFRInterestingFacts()); Navigation.findNavController(getView()).navigate(FR_MenuDirections.actionFRMenuToFRRVLevelSelectionMenu()); } if(view.getId() == R.id.button_options) { Navigation.findNavController(getView()).navigate(FR_MenuDirections.actionFRMenuToFROptions()); } if(view.getId() == R.id.button_test) { Navigation.findNavController(getView()).navigate(FR_MenuDirections.actionFRMenuToTest()); } if(view.getId() == R.id.button_exit) { getActivity().finishAndRemoveTask(); } }}the language of the string resources are correctly changed. However, when navigating from the FR_Menu class to another class, the language of the string ressources changes back to the default (English) again. Why is this happening?