Java tutorial
/* * Copyright 2016 Maurice Kenmeue Fonwe * * 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 dynamite.zafroshops.app.fragment; import android.app.Activity; import android.os.Bundle; import android.support.annotation.NonNull; import android.support.v4.app.Fragment; import android.support.v4.widget.SwipeRefreshLayout; import android.util.Pair; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.LinearLayout; import android.widget.ListView; import android.widget.RelativeLayout; import com.google.common.util.concurrent.FutureCallback; import com.google.common.util.concurrent.Futures; import com.google.common.util.concurrent.ListenableFuture; import com.google.gson.Gson; import com.google.gson.JsonArray; import com.google.gson.JsonElement; import com.google.gson.reflect.TypeToken; import java.util.ArrayList; import dynamite.zafroshops.app.MainActivity; import dynamite.zafroshops.app.R; import dynamite.zafroshops.app.adapter.TypedZopListViewAdapter; import dynamite.zafroshops.app.data.MobileZop; import dynamite.zafroshops.app.data.ZopType; public class NearestZopsFragment extends Fragment { private static final String ARG_ZOP_COUNT = "zop_count"; private int count; private boolean loading; private TypedZopListViewAdapter adapter; public ArrayList<MobileZop> nearestZops; private SwipeRefreshLayout swipeRefreshLayout; /** * Returns a new instance of this fragment for the given section * number. */ public static NearestZopsFragment newInstance(int count) { NearestZopsFragment fragment = new NearestZopsFragment(); Bundle args = new Bundle(); args.putSerializable(ARG_ZOP_COUNT, count); fragment.setArguments(args); return fragment; } public NearestZopsFragment() { nearestZops = new ArrayList<MobileZop>() { }; } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { final MainActivity activity = (MainActivity) getActivity(); activity.restoreActionBar(); // swipe to refresh swipeRefreshLayout = (SwipeRefreshLayout) activity.findViewById(R.id.swipeRefreshLayout); swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() { @Override public void onRefresh() { activity.refreshNearest(); swipeRefreshLayout.setRefreshing(false); } }); super.onCreateOptionsMenu(menu, inflater); } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setHasOptionsMenu(true); count = getArguments().getInt(ARG_ZOP_COUNT, 5); setZops(); } private void setZops() { adapter = new TypedZopListViewAdapter(getActivity(), R.id.listViewItem, nearestZops); final ArrayList<Pair<String, String>> parameters; if (MainActivity.LastLocation != null) { parameters = new ArrayList<Pair<String, String>>() { { add(new Pair<>("latitude", Double.toString(MainActivity.LastLocation.Latitude))); add(new Pair<>("longitude", Double.toString(MainActivity.LastLocation.Longitude))); add(new Pair<>("$top", Integer.toString(count))); } }; } else { parameters = new ArrayList<Pair<String, String>>() { { add(new Pair<>("$top", Integer.toString(count))); } }; } loading = true; ListenableFuture<JsonElement> result = MainActivity.MobileClient.invokeApi("mobileZop", "GET", parameters); Futures.addCallback(result, new FutureCallback<JsonElement>() { Activity activity = getActivity(); @Override public void onSuccess(JsonElement result) { JsonArray typesAsJson = result.getAsJsonArray(); if (typesAsJson != null) { nearestZops = new Gson().fromJson(result, new TypeToken<ArrayList<MobileZop>>() { }.getType()); } loading = false; if (adapter != null) { adapter.setObjects(nearestZops); resetVisibility(false); adapter.notifyDataSetChanged(); } } @Override public void onFailure(@NonNull Throwable t) { ListView zops = (ListView) activity.findViewById(R.id.listViewZops); RelativeLayout loader = (RelativeLayout) activity.findViewById(R.id.relativeLayoutLoader); LinearLayout noZops = (LinearLayout) activity.findViewById(R.id.noZops); resetVisibility(zops, noZops, loader, false); } }); } @Override public void onResume() { super.onResume(); if (adapter != null) { adapter.setObjects(nearestZops); adapter.notifyDataSetChanged(); } } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_typed_zops, container, false); ListView listView = (ListView) rootView.findViewById(R.id.listViewZops); resetVisibility(listView, (LinearLayout) rootView.findViewById(R.id.noZops), (RelativeLayout) rootView.findViewById(R.id.relativeLayoutLoader), loading); listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { MobileZop item = (MobileZop) parent.getAdapter().getItem(position); MainActivity activity = (MainActivity) getActivity(); if (activity.AdsActive && activity.Interstitial.isLoaded()) { activity.Interstitial.show(); } activity.setCurrentItem(item.id, item); activity.nextMenu(ZopItemFragment.newInstance(item.id), true, 100); } }); listView.setAdapter(adapter); return rootView; } @Override public void onAttach(Activity activity) { super.onAttach(activity); } private void resetVisibility(boolean showLoader) { Activity activity = getActivity(); ListView zops = (ListView) activity.findViewById(R.id.listViewZops); LinearLayout noZops = (LinearLayout) activity.findViewById(R.id.noZops); RelativeLayout loader = (RelativeLayout) activity.findViewById(R.id.relativeLayoutLoader); resetVisibility(zops, noZops, loader, showLoader); } private void resetVisibility(ListView zops, LinearLayout noZops, RelativeLayout loader, boolean showLoader) { Activity activity = getActivity(); if (nearestZops.size() == 0) { noZops.setVisibility(View.VISIBLE); zops.setVisibility(View.INVISIBLE); } else { noZops.setVisibility(View.INVISIBLE); zops.setVisibility(View.VISIBLE); } if (showLoader) { zops.setVisibility(View.INVISIBLE); noZops.setVisibility(View.INVISIBLE); loader.setVisibility(View.VISIBLE); } else { loader.setVisibility(View.INVISIBLE); } } }