65+ stand remember position and changes the theme.

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

@@ -1,9 +1,11 @@
 package com.a1.nextlocation.fragments;
 
+import android.content.SharedPreferences;
 import android.os.Bundle;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.appcompat.widget.SwitchCompat;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentActivity;
 
@@ -20,6 +22,7 @@ import com.a1.nextlocation.R;
 public class SettingsFragment extends Fragment {
 
     private ImageView imageButton;
+    SwitchCompat fontChanger;
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
@@ -46,6 +49,29 @@ public class SettingsFragment extends Fragment {
             ((FragmentActivity) view.getContext()).getSupportFragmentManager().beginTransaction().replace(R.id.fragment_layout, homeFragment).addToBackStack(null).commit();
         });
 
+
+        fontChanger = view.findViewById(R.id.BigFont);
+
+        SharedPreferences sharedPreferences = requireActivity().getSharedPreferences("com.a1.nextlocation",0);
+        final SharedPreferences.Editor editor = sharedPreferences.edit();
+        fontChanger.setChecked(sharedPreferences.getBoolean("switch",false));
+
+        fontChanger.setOnClickListener(view1 -> {
+            if(fontChanger.isChecked())
+            {
+                requireActivity().setTheme(R.style.Theme_NextLocationBig);
+                editor.putBoolean("switch",true);
+                editor.apply();
+            }
+            if(!fontChanger.isChecked())
+            {
+                requireActivity().setTheme(R.style.Theme_NextLocation);
+                editor.putBoolean("switch",false);
+                editor.apply();
+            }
+            editor.commit();
+        });
+
         String[] items = new String[]{"Nederlands", "Engels", "Chinees"};
         ArrayAdapter<String> arrayAdapter = new ArrayAdapter<>(getActivity(), android.R.layout.simple_spinner_dropdown_item, items);