@Override
  public void onStart() {
    super.onStart();

    String prefsName = getString(R.string.prefs_name);
    SharedPreferences prefs = getSharedPreferences(prefsName, 0);
    boolean isLoggedIn = prefs.getBoolean("isLoggedIn", false);

    if (isLoggedIn) {
      Intent intent = new Intent(this, MainActivity.class);
      startActivity(intent);
      finish();
    } else {
      Intent intent = new Intent(this, IntroActivity.class);
      startActivity(intent);
      finish();
    }
  }
 @Override
 protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_splash);
 }