Use SharedPreferences - Android

gistfile1.txt

private void logout(){
  SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
  Editor editor = pref.edit();
  editor.clear();
  editor.commit();
}

private void storeSomthing(){
  SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
  Editor editor = pref.edit();
  editor.putString("key_name", "string value");
  editor.commit();
}

private String getSomthing(String key){
  SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
  Editor editor = pref.edit();
  return editor.getString(key, "string value");
}