Merge remote-tracking branch 'origin/develop' into Tests

app/src/main/java/com/a1/nextlocation/fragments/SettingsFragment.java

@@ -1,15 +1,20 @@
 package com.a1.nextlocation.fragments;
 
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.content.res.Configuration;
 import android.os.Bundle;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentActivity;
+import androidx.fragment.app.FragmentTransaction;
 
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.AdapterView;
 import android.widget.ArrayAdapter;
 import android.widget.ImageView;
 import android.widget.Spinner;
@@ -17,28 +22,27 @@ import android.widget.Spinner;
 import com.a1.nextlocation.MainActivity;
 import com.a1.nextlocation.R;
 
+import java.util.Locale;
+
 public class SettingsFragment extends Fragment {
 
+    private SharedPreferences.Editor editor;
+    
     private ImageView imageButton;
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        editor = getContext().getSharedPreferences("Settings", Context.MODE_PRIVATE).edit();
     }
 
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
-        
-        return inflater.inflate(R.layout.fragment_settings, container, false);
-    }
 
-    @Override
-    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
-        super.onViewCreated(view, savedInstanceState);
+        View view = inflater.inflate(R.layout.fragment_settings, container, false);
 
-        // Inflate the layout for this fragment
-        Spinner dropdown = view.findViewById(R.id.dropdown_menu_Settings);
+        initializeLanguageDropdown(view);
 
         this.imageButton = view.findViewById(R.id.settings_back_button);
         this.imageButton.setOnClickListener(v -> {
@@ -46,9 +50,95 @@ public class SettingsFragment extends Fragment {
             ((FragmentActivity) view.getContext()).getSupportFragmentManager().beginTransaction().replace(R.id.fragment_layout, homeFragment).addToBackStack(null).commit();
         });
 
+        return view;
+    }
+
+    private void initializeLanguageDropdown(View view) {
+        Spinner languageDropdown = view.findViewById(R.id.dropdown_menu_Settings);
         String[] items = new String[]{"Nederlands", "Engels", "Chinees"};
         ArrayAdapter<String> arrayAdapter = new ArrayAdapter<>(getActivity(), android.R.layout.simple_spinner_dropdown_item, items);
+        languageDropdown.setAdapter(arrayAdapter);
 
-        dropdown.setAdapter(arrayAdapter);
+        // set the language dropdown on the currently selected language stored in the sharedPreferences
+        languageDropdown.setSelection(languageToDropdownPosition(getContext().getSharedPreferences("Settings", Context.MODE_PRIVATE).getString("Language", "")));
+
+        long previousID = languageDropdown.getSelectedItemId();
+        languageDropdown.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
+            @Override
+            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
+                setLocale(dropdownPositionToLanguage(id));
+                if (id != previousID) {
+                    Fragment currentFragment = getActivity().getSupportFragmentManager().findFragmentById(R.id.fragment_layout);
+                    FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
+                    fragmentTransaction.detach(currentFragment);
+                    fragmentTransaction.attach(currentFragment);
+                    fragmentTransaction.commit();
+                }
+            }
+
+            @Override
+            public void onNothingSelected(AdapterView<?> parent) {
+            }
+        });
+    }
+
+    /**
+     * converts the languageDropdown position to the belonging language
+     *
+     * @param id desired position to convert
+     * @return the language belonging to the position of the languageDropdown
+     */
+    private String dropdownPositionToLanguage(long id) {
+        switch ((int) id) {
+            case 0:
+                return "nl";
+            case 1:
+                return "en";
+            default:
+                return "";
+        }
+    }
+
+    /**
+     * converts language to the languageDropdown position
+     *
+     * @param language desired language to convert
+     * @return the position of the language in the languageDropdown
+     */
+    private int languageToDropdownPosition(String language) {
+        switch (language) {
+            case "nl":
+                return 0;
+            case "en":
+                return 1;
+            default:
+                return 1;
+        }
+    }
+
+    /**
+     * reloads the fragment
+     */
+    private void refresh() {
+        Fragment currentFragment = getActivity().getSupportFragmentManager().findFragmentById(R.id.fragment_layout);
+        FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
+        fragmentTransaction.detach(currentFragment);
+        fragmentTransaction.attach(currentFragment);
+        fragmentTransaction.commit();
+    }
+
+    /**
+     * changes the current language to the desired language and saves this setting in SharedPreferences
+     *
+     * @param language the desired language to translate to
+     */
+    private void setLocale(String language) {
+        Locale locale = new Locale(language);
+        Locale.setDefault(locale);
+        Configuration config = new Configuration();
+        config.setLocale(locale);
+        getContext().getResources().updateConfiguration(config, getContext().getResources().getDisplayMetrics());
+        editor.putString("Language", language);
+        editor.apply();
     }
 }