Example of fragment that implements Contract.View

ShoppingFragment.java

package me.fleka.deltacity.presentation.shopping;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.Snackbar;
import android.support.v4.app.Fragment;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.SearchView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RelativeLayout;
import android.widget.Toast;
import butterknife.BindString;
import butterknife.BindView;
import butterknife.ButterKnife;
import java.util.List;
import me.fleka.deltacity.R;
import me.fleka.deltacity.domain.models.Category;
import me.fleka.deltacity.domain.models.Shop;

import static com.google.gson.internal.$Gson$Preconditions.checkNotNull;

/**
 * Created by mladenrakonjac on 13/09/16.
 */
public class ShoppingFragment extends Fragment implements ShoppingContract.View {
  @BindString(R.string.err_no_internet_connection) String errNoInternetString;
  @BindView(R.id.loading_relative_layout) RelativeLayout mLoadingRelativeLayout;
  @BindView(R.id.no_content_relative_layout) RelativeLayout mNoContentRelativeLayou;
  @BindView(R.id.search_view) SearchView mSearchView;
  @BindView(R.id.category_recycler_view) RecyclerView mCategoryRecyclerView;

  private ShoppingContract.Presenter mPresenter;

  public static ShoppingFragment newInstance() {
    return new ShoppingFragment();
  }

  public ShoppingFragment() {
    // Required empty public constructor
  }

  @Override public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    getActivity().setTitle(getString(R.string.shopping));
  }

  @Override public void onResume() {
    super.onResume();
    mPresenter.start();
  }

  @Override public void setPresenter(@NonNull ShoppingContract.Presenter presenter) {
    mPresenter = checkNotNull(presenter);
  }

  @Override public View onCreateView(LayoutInflater inflater, ViewGroup container,
      Bundle savedInstanceState) {

    View view = inflater.inflate(R.layout.fragment_shopping, container, false);
    ButterKnife.bind(this, view);
    return view;
  }

  @Override public void setLoadingIndicator(boolean active) {
    if(active)
    {
      mLoadingRelativeLayout.setVisibility(View.VISIBLE);
    } else {
      mLoadingRelativeLayout.setVisibility(View.GONE);
    }
  }

  @Override public void showCategories(List<Category> categoryList) {
    Toast.makeText(getActivity(), categoryList.get(0).getName(), Toast.LENGTH_SHORT).show();
  }

  @Override public void showNoInternetConnection() {
    Snackbar.make(mLoadingRelativeLayout, errNoInternetString, Snackbar.LENGTH_LONG).show();
  }

  @Override public void showLoadingCategoriesError() {

  }

  @Override public void showListOfFoundedShopForSearch(List<Shop> shopList) {

  }

  @Override public void showNoShopsFound() {
    mLoadingRelativeLayout.setVisibility(View.VISIBLE);
  }
}