DealActivity V1 for Henson article

DetailActivityV1.java

public class DetailActivity extends Activity {
  public static final String EXTRA_ITEM_ID = "extra.item_id";
  public static final String EXTRA_SHOW_MAP = "extra.show_map";
  
  private String itemId;
  private boolean shouldShowMap;
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    itemId = getIntent().getStringExtra(EXTRA_ITEM_ID);
    shouldShowMap = getIntent().getBooleanExtra(EXTRA_SHOW_MAP, false);
    
    if (itemId == null) {
      throw new IllegalArgumentException("Item Id is required");
    }
    ...
  }
  ...
}