Java tutorial
/** * Copyright 2016 Carl-Philipp Harmant * <p/> * 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 * <p/> * http://www.apache.org/licenses/LICENSE-2.0 * <p/> * 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 fr.cph.chicago.core.fragment; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.text.Editable; import android.text.TextWatcher; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.EditText; import android.widget.ListView; import android.widget.RelativeLayout; import com.annimon.stream.Collectors; import com.annimon.stream.Stream; import org.apache.commons.lang3.StringUtils; import java.util.ArrayList; import java.util.List; import butterknife.BindString; import butterknife.BindView; import butterknife.ButterKnife; import butterknife.Unbinder; import fr.cph.chicago.R; import fr.cph.chicago.core.activity.MainActivity; import fr.cph.chicago.core.adapter.BikeAdapter; import fr.cph.chicago.entity.BikeStation; import fr.cph.chicago.util.Util; /** * Bike Fragment * * @author Carl-Philipp Harmant * @version 1 */ public class BikeFragment extends Fragment { private static final String ARG_SECTION_NUMBER = "section_number"; @BindView(R.id.loading_relativeLayout) RelativeLayout loadingLayout; @BindView(R.id.bike_list) ListView bikeListView; @BindView(R.id.bike_filter) EditText filter; @BindView(R.id.error_layout) RelativeLayout errorLayout; @BindString(R.string.bundle_bike_stations) String bundleBikeStations; private Unbinder unbinder; private MainActivity activity; private BikeAdapter bikeAdapter; private List<BikeStation> bikeStations; /** * Returns a new instance of this fragment for the given section number. * * @param sectionNumber the section number * @return the fragment */ @NonNull public static BikeFragment newInstance(final int sectionNumber) { final BikeFragment fragment = new BikeFragment(); final Bundle args = new Bundle(); args.putInt(ARG_SECTION_NUMBER, sectionNumber); fragment.setArguments(args); return fragment; } @Override public final void onAttach(final Context context) { super.onAttach(context); activity = context instanceof Activity ? (MainActivity) context : null; } @Override public final void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); bikeStations = getBikeStations(savedInstanceState); setHasOptionsMenu(true); Util.trackScreen(getContext(), getString(R.string.analytics_bike_fragment)); } @NonNull private List<BikeStation> getBikeStations(@Nullable final Bundle savedInstanceState) { List<BikeStation> bikeStations; if (savedInstanceState != null) { bikeStations = savedInstanceState.getParcelableArrayList(getString(R.string.bundle_bike_stations)); } else { final Bundle bundle = activity.getIntent().getExtras(); bikeStations = bundle.getParcelableArrayList(getString(R.string.bundle_bike_stations)); } if (bikeStations == null) { bikeStations = new ArrayList<>(); } return bikeStations; } @Override public final View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) { final View rootView = inflater.inflate(R.layout.fragment_bike, container, false); if (!activity.isFinishing()) { unbinder = ButterKnife.bind(this, rootView); if (!bikeStations.isEmpty()) { loadList(); } else { loadError(); } } return rootView; } @Override public void onDestroyView() { super.onDestroyView(); if (unbinder != null) { unbinder.unbind(); } } private void loadList() { if (bikeAdapter == null) { List<BikeStation> bikeStations = activity.getIntent().getExtras() .getParcelableArrayList(bundleBikeStations); if (bikeStations == null) { bikeStations = new ArrayList<>(); } bikeAdapter = new BikeAdapter(bikeStations); } bikeListView.setAdapter(bikeAdapter); filter.addTextChangedListener(new TextWatcher() { private List<BikeStation> bikeStations; @Override public void beforeTextChanged(final CharSequence s, final int start, final int count, final int after) { bikeStations = new ArrayList<>(); } @Override public void onTextChanged(final CharSequence s, final int start, final int before, final int count) { bikeStations.addAll(Stream.of(BikeFragment.this.bikeStations).filter( bikeStation -> StringUtils.containsIgnoreCase(bikeStation.getName(), s.toString().trim())) .collect(Collectors.toList())); } @Override public void afterTextChanged(final Editable s) { bikeAdapter.setBikeStations(this.bikeStations); bikeAdapter.notifyDataSetChanged(); } }); bikeListView.setVisibility(ListView.VISIBLE); filter.setVisibility(ListView.VISIBLE); loadingLayout.setVisibility(RelativeLayout.INVISIBLE); errorLayout.setVisibility(RelativeLayout.INVISIBLE); } private void loadError() { loadingLayout.setVisibility(RelativeLayout.INVISIBLE); errorLayout.setVisibility(RelativeLayout.VISIBLE); } public final void setBikeStations(@NonNull final List<BikeStation> bikeStations) { this.bikeStations = bikeStations; if (bikeAdapter == null) { loadList(); } else { bikeAdapter.setBikeStations(bikeStations); bikeAdapter.notifyDataSetChanged(); } } }