یه کلاس تعریف کردن به اسم pref یه شکل زیر
public class Prefs {
private static final String MOBILENUMBER = "091";
private static final String PREFS_NAME = "mobileNumber";
private SharedPreferences mobile;
public Prefs(Context sms) {
mobile = sms.getSharedPreferences(PREFS_NAME, Context.MODE_PRIVATE);
}
public void saveMobNumber(String mob) {
SharedPreferences.Editor editor = mobile.edit();
editor.putString(MOBILENUMBER, mob);
editor.commit();
editor.apply();
}
public String getMobNumber() {