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);
 

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

@@ -160,6 +160,7 @@
         <androidx.appcompat.widget.SwitchCompat
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
+            android:id="@+id/BigFont"
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="@id/Balk3"

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

@@ -7,5 +7,16 @@
         <item name="colorSecondary">@color/secondaryColour</item>
         <!-- Customize your theme here. -->
         <item name="colorButtonNormal">@color/buttonColour</item>
+        <item name="android:textSize">16sp</item>
+    </style>
+
+    <style name="Theme.NextLocationBig" parent="Theme.MaterialComponents.DayNight.NoActionBar">
+        <!-- Primary brand color. -->
+        <item name="colorPrimary">@color/primaryColour</item>
+        <!-- Secondary brand color. -->
+        <item name="colorSecondary">@color/secondaryColour</item>
+        <!-- Customize your theme here. -->
+        <item name="colorButtonNormal">@color/buttonColour</item>
+        <item name="android:textSize">24sp</item>
     </style>
 </resources>