Java tutorial
/* * Copyright (C) 2015 Kyle O'Shaughnessy, Ross Anderson, Michelle Mabuyo, John Slevinsky, Udey Rishi, Quentin Lautischer * Photography equipment trading application for CMPUT 301 at the University of Alberta. * * This file is part of "Trading Post" * * "Trading Post" is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package ca.ualberta.cmput301.t03.inventory; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.content.Intent; import android.os.AsyncTask; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.widget.SwipeRefreshLayout; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.EditText; import android.widget.ListView; import android.widget.Spinner; import android.widget.Toast; import java.io.IOException; import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.concurrent.Callable; import ca.ualberta.cmput301.t03.Observable; import ca.ualberta.cmput301.t03.Observer; import ca.ualberta.cmput301.t03.PrimaryUser; import ca.ualberta.cmput301.t03.R; import com.udeyrishi.androidelasticsearchdatamanager.exceptions.ServiceNotAvailableException; import ca.ualberta.cmput301.t03.filters.FilterCriteria; import ca.ualberta.cmput301.t03.filters.FilterDialogs; import ca.ualberta.cmput301.t03.filters.item_criteria.CategoryFilterCriteria; import ca.ualberta.cmput301.t03.filters.item_criteria.PrivateFilterCriteria; import ca.ualberta.cmput301.t03.filters.item_criteria.StringQueryFilterCriteria; import ca.ualberta.cmput301.t03.user.User; /** * Fragment that displays a ListView containing all Items from all friends. * This can (later) be filtered by friends, category, and Texttual Query. */ public class BrowseInventoryFragment extends Fragment implements Observer, SwipeRefreshLayout.OnRefreshListener { Activity mActivity; View mView; ArrayList<Item> allItems; ArrayList<HashMap<String, Object>> listItems; ItemsAdapter<Inventory> adapter; private Inventory model; private BrowseInventoryController controller; private SwipeRefreshLayout mSwipeRefreshLayout; private ListView mListview; private ArrayList<FilterCriteria> filters; private final Object uiLock = new Object(); private boolean init = true; public BrowseInventoryFragment() { // Required empty public constructor } public static BrowseInventoryFragment newInstance() { return new BrowseInventoryFragment(); } /** * Gets User associated to system config. Loads any data associated to Browsables. * Namely Users friendList. * * @param savedInstanceState */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); mActivity = getActivity(); filters = new ArrayList<>(); filters.add(new PrivateFilterCriteria()); setHasOptionsMenu(true); } @Override public void onResume() { super.onResume(); onRefresh(); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { synchronized (uiLock) { mView = inflater.inflate(R.layout.fragment_browse_inventory, container, false); mListview = (ListView) mView.findViewById(R.id.BrowseListView); } return mView; } /** * Starts intent for inspecting item * * @param item */ public void inspectItem(Item item) { AsyncTask<Item, Void, Intent> findItemOwnerAndStartInspectItemActivity = new AsyncTask<Item, Void, Intent>() { @Override protected Intent doInBackground(Item[] items) { Intent intent = new Intent(getContext(), InspectItemView.class); try { for (User friend : PrimaryUser.getInstance().getFriends().getFriends()) { if (friend.getInventory().getItems().containsKey(items[0].getUuid())) { intent.putExtra("user", friend.getUsername()); intent.putExtra("ITEM_UUID", items[0].getUuid().toString()); } } } catch (IOException e) { throw new RuntimeException(e); } catch (ServiceNotAvailableException e) { throw new RuntimeException("App is offline.", e); } return intent; } @Override protected void onPostExecute(Intent i) { super.onPostExecute(i); startActivity(i); } }; findItemOwnerAndStartInspectItemActivity.execute(item); } /** * {@inheritDoc} */ @Override public void onDestroy() { if (model != null) { model.removeObserver(this); } super.onDestroy(); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { super.onCreateOptionsMenu(menu, inflater); inflater.inflate(R.menu.inventory_filter_menu_items, menu); } @Override public void update(Observable observable) { onRefresh(); } @Override public boolean onOptionsItemSelected(MenuItem item) { AlertDialog alertDialog; switch (item.getItemId()) { case R.id.filter_inventory_button: alertDialog = FilterDialogs.createAddFilterDialog(getContext(), filters, new Callable<Void>() { @Override public Void call() throws Exception { onRefresh(); //Ideally like to not full refresh and just have the adapter watch the item list change return null; } }); alertDialog.show(); return true; case R.id.search_inventory_button: alertDialog = FilterDialogs.createAddSearchDialog(getContext(), filters, new Callable<Void>() { @Override public Void call() throws Exception { onRefresh(); //Ideally like to not full refresh and just have the adapter watch the item list change return null; } }); alertDialog.show(); return true; default: return super.onOptionsItemSelected(item); } } private void setupListView() { adapter = new ItemsAdapter<>(mActivity.getBaseContext(), model); mListview.setAdapter(adapter); mListview.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { inspectItem((Item) parent.getItemAtPosition(position)); } }); mSwipeRefreshLayout = (SwipeRefreshLayout) mView.findViewById(R.id.browseListSwipeLayout); mSwipeRefreshLayout.setOnRefreshListener(BrowseInventoryFragment.this); } @Override public void onRefresh() { AsyncTask<Void, Void, Void> task = new AsyncTask<Void, Void, Void>() { @Override protected Void doInBackground(Void... params) { try { PrimaryUser.getInstance().refresh(); model = PrimaryUser.getInstance().getBrowseableInventories(filters); //fixme browseableinventories actually needs to refresh } catch (IOException e) { throw new RuntimeException(e); } catch (ServiceNotAvailableException e) { throw new RuntimeException(e); } return null; } @Override protected void onPostExecute(Void aVoid) { // model.setFilters(filters); if (model.size() > 0) { if (init) { init = false; setupListView(); } else { if (mSwipeRefreshLayout.isRefreshing()) { mSwipeRefreshLayout.setRefreshing(false); } adapter.notifyUpdated(model); } } else { synchronized (uiLock) { if (getActivity().getSupportFragmentManager() != null) { getActivity().getSupportFragmentManager().beginTransaction() .replace(R.id.fragmentContent, NoFriendsBrowseInventory.newInstance()).commit(); } } } } }; task.execute(); } }