@Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    UtilityClass.publicRoomMessages = new Vector<MessageClass>();
    UtilityClass.cntxt = this.getApplicationContext();
    UtilityClass.readRegistrationInformation();
  }
 @Test
 public void testIntToHexCases() {
   assertThat(utillity.hexToInt(input), is(expected));
 }
  @Override
  public void onResume() {
    super.onResume();

    UtilityClass.readRegistrationInformation();
  }
 public void deregister(View v) {
   UtilityClass.deleteUserFile();
   Intent intent = getIntent();
   finish();
   startActivity(intent);
 }