dlemures

public class IntentFactory {
  public Intent newDetailActivityIntent(Context context, String itemId, boolean showMap) {
    Intent intent = new Intent(context, DetailActivity.class);
    intent.putExtra(EXTRA_ITEM_ID, itemId);
    intent.putExtra(EXTRA_SHOW_MAP, showMap);
    return intent;
  }
  ...
}

dlemures

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);

dlemures

Intent intent = new Intent(context, DetailActivity.class);
intent.putExtra(EXTRA_ITEM_ID, selectedItem.id);
intent.putExtra(EXTRA_SHOW_MAP, true);
startActivity(intent);