orhanobut

public Foobar {
  private User user;
  
  private void showAvatar(){
    Image image = user.getAccount().getImage();
  }
}

orhanobut

public Foobar {
  private User user;
  
  private void showAvatar(){
    if (user != null){
      Account account = user.getAccount();
      if (account != null){
        Image image = account.getImage();
        
        //MORE?

orhanobut

public class Foobar{
  public void showAvatar() {
    Image image = user.getProfile().getImage();
  }
}

orhanobut

public class ProductListFragment extends Fragment {
  private String uuid;
  
  @Override public void onCreate() {
    uuid = UUID.randomUUID().toString();
  }
  
  @Override void onCreateView(...) {
    listener.onRefreshData(uuid);
  }

orhanobut

public class ProductListFragment extends Fragment {
  
  @Override public void onCreateView(...) {
    listener.onRefreshData();
  }
  
  public void onEvent(ProductListSuccessEvent event) {
    doSomething(event);
  }
  

orhanobut

public class ProductListActivity extends Activity implements FragmentListener{
  
  @Override public void onRefreshData() {
    apiService.getProducts(new Callback() {
      
      @Override void onSuccess(List<Product> list){
        EventBus.getDefault().post(new ProductListSuccessEvent(list));
      }
      
      @Override void onFail(Error error){

orhanobut

public class ProductListActivity extends Activity implements FragmentListener{
  
  @Override public void onRefreshData(String uuid) {
    apiService.getProducts(new Callback() {
      
      @Override void onSuccess(List<Product> list){
        EventBus.getDefault().post(new ProductListSuccessEvent(uuid, list));
      }
      
      @Override void onFail(Error error){

orhanobut

public class ProductListFragment extends Fragment {
  private String uuid;
  
  @Override public void onCreateView(...) {
    listener.onRefreshData();
  }
  
  public void onEvent(ProductListSuccessEvent event) {
    if (!TextUtils.equals(uuid, event.uuid) {
      return;

orhanobut

public class ProductListFragment extends Fragment {
  
  private static final String KEY_UUUID = "KEY_UUID";
  
  private String uuid;
  
  @Override public void onCreate(Bundle bundle) {
    super.onCreate(bundle);
    if (bundle != null && bundle.containsKey(KEY_UUID)) {
      uuid = bundle.getString(KEY_UUID);

orhanobut

public class BaseFragment extends Fragment {
  
  private static final String KEY_UUUID = "KEY_UUID";
  
  private String uuid;
  
  @Override public void onCreate(Bundle bundle) {
    super.onCreate(bundle);
    if (bundle != null && bundle.containsKey(KEY_UUID)) {
      uuid = bundle.getString(KEY_UUID);