DetailActivity.java

@Override
public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  ActivityDetailBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_detail);
  
  //This is just initalize the mEvent instance
  mEvent = new Gson().fromJson(getIntent().getStringExtra(Constants.EVENT_EXTRA), Event.class);
  
  binding.setEvent(mEvent);
}