Store Arraylist in SharedPreferences with Gson

I am new in Java and Android development. I have a database that includes gender, phone number, name and hobby array. I want to store in my activity with SharedPreferences but I don't know how to apply Gson class. This is my code:

public class SessionManager {
SharedPreferences usersSession;
SharedPreferences.Editor editor;
Context context;
public static final String IS_LOGIN = "IsLoggedIn";
public static final String KEY_NAME = "name";
public static final String KEY_BIRTHDATE = "birthdate";
public static final String KEY_GENDER = "gender";
public static final String KEY_PHONE = "phone";
public static final ArrayList<String> KEY_HOBBIES = new ArrayList<>();
public SessionManager(Context _context) {
context = _context;
usersSession = _context.getSharedPreferences("userLoginSession", Context.MODE_PRIVATE);
editor = usersSession.edit();
Gson gson = new Gson();
String json = gson.toJson(KEY_HOBBIES);
}
public void createLoginSession(String name, String birthdate, String gender, String phone, ArrayList<String> hobbies) {
editor.putBoolean(IS_LOGIN, true);
Gson gson = new Gson();
String json = gson.toJson(KEY_HOBBIES);
editor.putString(KEY_NAME, name);
editor.putString(KEY_BIRTHDATE, birthdate);
editor.putString(KEY_GENDER, gender);
editor.putString(KEY_PHONE, phone);
editor.putString(KEY_HOBBIES, json);
editor.commit();
}

I made 2-3 mistakes in this code, how can I store this Arraylist with other string values. Thank you

to store ArrayList

 StringBuilder sb = new StringBuilder();
for (int i = 0; i < hobbies.size; i++) {
sb.append(hobbies.get(i)).append(",");
}
editor.putString(KEY_HOBBIES, sb.toString());

to retrieve it

    String[] array = playlist.split(",");
hobbies = new ArrayList<>(Arrays.asList(array));

You can use TYPE to read data from sharedPreferences

Read data

           Gson gson = new Gson();
String json = sharedPreferences.getString("Set", "");
Type type = new TypeToken<List<String>>() {
}.getType();
List<String> arrPackageData = gson.fromJson(json, type);
for(String data:arrPackageData) {
result.setText(data);
}

and save data

        final ArrayList<String> arrPackage;
String nameS = name.getText().toString().trim();
String birhtdayS = birthday.getText().toString().trim();
String gendarS = gendar.getText().toString().trim();
String phoneS = phone.getText().toString().trim();
arrPackage.add(nameS);
arrPackage.add(birhtdayS);
arrPackage.add(gendarS);
arrPackage.add(phoneS);
Gson gson = new Gson();
String json = gson.toJson(arrPackage);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString("Set",json );
editor.commit();
}