RetainingCountriesFragment.java

/*
 * Copyright 2015 Hannes Dorfmann.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.hannesdorfmann.mosby3.sample.mvp.lce.viewstate;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;

import android.view.ViewGroup;

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.Unbinder;

import com.hannesdorfmann.mosby3.mvp.viewstate.lce.LceViewState;
import com.hannesdorfmann.mosby3.mvp.viewstate.lce.MvpLceViewStateFragment;
import com.hannesdorfmann.mosby3.mvp.viewstate.lce.data.RetainingLceViewState;
import com.hannesdorfmann.mosby3.sample.R;
import com.hannesdorfmann.mosby3.sample.SampleApplication;
import com.hannesdorfmann.mosby3.sample.mvp.CountriesAdapter;
import com.hannesdorfmann.mosby3.sample.mvp.CountriesErrorMessage;
import com.hannesdorfmann.mosby3.sample.mvp.CountriesPresenter;
import com.hannesdorfmann.mosby3.sample.mvp.CountriesView;
import com.hannesdorfmann.mosby3.sample.mvp.lce.SimpleCountriesPresenter;
import com.hannesdorfmann.mosby3.sample.mvp.model.Country;

import java.util.List;

/**
 * This is an example of a RETAINING Fragment. The viewstate will be kept in memory during screen
 * orientation changes.
 *
 * @author Hannes Dorfmann
 */
public class RetainingCountriesFragment extends
    MvpLceViewStateFragment<SwipeRefreshLayout, List<Country>, CountriesView, CountriesPresenter>
    implements CountriesView, SwipeRefreshLayout.OnRefreshListener {

  @BindView(R.id.recyclerView) RecyclerView recyclerView;

  CountriesAdapter adapter;
  private Unbinder unbinder;

  @Override public LceViewState<List<Country>, CountriesView> createViewState() {
    setRetainInstance(true);
    return new RetainingLceViewState<>();
  }

  @Nullable @Override
  public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
      @Nullable Bundle savedInstanceState) {
    return inflater.inflate(R.layout.countries_list, container, false);
  }

  @Override public void onDestroyView() {
    super.onDestroyView();
    adapter = null;
    unbinder.unbind();
  }

  @Override public void onViewCreated(View view, @Nullable Bundle savedInstance) {
    super.onViewCreated(view, savedInstance);
    unbinder = ButterKnife.bind(this, view);

    // Setup contentView == SwipeRefreshView
    contentView.setOnRefreshListener(this);

    // Setup recycler view
    adapter = new CountriesAdapter(getActivity());
    recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
    recyclerView.setAdapter(adapter);
  }

  @Override public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
  }

  @Override public void loadData(boolean pullToRefresh) {
    presenter.loadCountries(pullToRefresh);
  }

  @Override protected String getErrorMessage(Throwable e, boolean pullToRefresh) {
    return CountriesErrorMessage.get(e, pullToRefresh, getActivity());
  }

  @Override public CountriesPresenter createPresenter() {
    return new SimpleCountriesPresenter();
  }

  @Override public void setData(List<Country> data) {
    adapter.setCountries(data);
    adapter.notifyDataSetChanged();
  }

  @Override public void onRefresh() {
    loadData(true);
  }

  @Override public void showContent() {
    super.showContent();
    contentView.setRefreshing(false);
  }

  @Override public void showError(Throwable e, boolean pullToRefresh) {
    super.showError(e, pullToRefresh);
    contentView.setRefreshing(false);
  }

  @Override public void showLoading(boolean pullToRefresh) {
    super.showLoading(pullToRefresh);
    if (pullToRefresh && !contentView.isRefreshing()) {
      // Workaround for measure bug: https://code.google.com/p/android/issues/detail?id=77712
      contentView.post(new Runnable() {
        @Override public void run() {
          contentView.setRefreshing(true);
        }
      });
    }
  }

  @Override public List<Country> getData() {
    return adapter == null ? null : adapter.getCountries();
  }

  @Override public void onDestroy() {
    super.onDestroy();
    SampleApplication.getRefWatcher(getActivity()).watch(this);
  }
}