Java tutorial
/* * Copyright (C) 2010 Paul Watts (paulcwatts@gmail.com) * * 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 can.yrt.onebusaway; import can.yrt.oba.ObaApi; import can.yrt.oba.elements.ObaRoute; import can.yrt.oba.request.ObaRoutesForLocationRequest; import can.yrt.oba.request.ObaRoutesForLocationResponse; import android.content.Context; import android.content.Intent; import android.location.Location; import android.os.Bundle; import android.support.v4.app.LoaderManager; import android.support.v4.content.AsyncTaskLoader; import android.support.v4.content.Loader; import android.view.ContextMenu; import android.view.ContextMenu.ContextMenuInfo; import android.view.LayoutInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView.AdapterContextMenuInfo; import android.widget.ListAdapter; import android.widget.ListView; import android.widget.TextView; import java.util.Arrays; public class MySearchRoutesFragment extends MySearchFragmentBase implements LoaderManager.LoaderCallbacks<ObaRoutesForLocationResponse> { //private static final String TAG = "MySearchRoutesActivity"; private static final String QUERY_TEXT = "query_text"; public static final String TAB_NAME = "search"; private MyAdapter mAdapter; @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); mAdapter = new MyAdapter(getActivity()); setListAdapter(mAdapter); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup root, Bundle savedInstanceState) { if (root == null) { // Currently in a layout without a container, so no // reason to create our view. return null; } return inflater.inflate(R.layout.my_search_route_list, null); } @Override public Loader<ObaRoutesForLocationResponse> onCreateLoader(int id, Bundle args) { String query = args.getString(QUERY_TEXT); return new MyLoader(getActivity(), query, getSearchCenter()); } @Override public void onLoadFinished(Loader<ObaRoutesForLocationResponse> loader, ObaRoutesForLocationResponse response) { UIHelp.showProgress(this, false); //Log.d(TAG, "Loader finished"); final int code = response.getCode(); if (code == ObaApi.OBA_OK) { setEmptyText(getString(R.string.find_hint_noresults)); mAdapter.setData(Arrays.asList(response.getRoutesForLocation())); } else if (code != 0) { // If we get anything other than a '0' error, that means // the server actually returned something to us, // (even if it was an error) so we shouldn't show // a 'communication' error. Just fake no results. setEmptyText(getString(R.string.find_hint_noresults)); } else { setEmptyText(getString(R.string.generic_comm_error)); } } @Override public void onLoaderReset(Loader<ObaRoutesForLocationResponse> loader) { mAdapter.clear(); } // // Base class // @Override protected void doSearch(String text) { UIHelp.showProgress(this, true); Bundle args = new Bundle(); args.putString(QUERY_TEXT, text); Loader<?> loader = getLoaderManager().restartLoader(0, args, this); loader.onContentChanged(); } @Override protected int getEditBoxHintText() { return R.string.search_route_hint; } @Override protected int getMinSearchLength() { return 1; } @Override protected CharSequence getHintText() { return getString(R.string.find_hint_nofavoriteroutes); } @Override public void onListItemClick(ListView l, View v, int position, long id) { // Get the adapter (this may or may not be a SimpleCursorAdapter) ListAdapter adapter = l.getAdapter(); ObaRoute route = (ObaRoute) adapter.getItem(position - l.getHeaderViewsCount()); final String routeId = route.getId(); final String routeName = UIHelp.getRouteDisplayName(route); if (isShortcutMode()) { Intent intent = RouteInfoActivity.makeIntent(getActivity(), routeId); makeShortcut(routeName, intent); } else { RouteInfoActivity.start(getActivity(), routeId); } } @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { super.onCreateContextMenu(menu, v, menuInfo); AdapterContextMenuInfo info = (AdapterContextMenuInfo) menuInfo; final TextView text = (TextView) info.targetView.findViewById(R.id.short_name); menu.setHeaderTitle(getString(R.string.route_name, text.getText())); if (isShortcutMode()) { menu.add(0, CONTEXT_MENU_DEFAULT, 0, R.string.my_context_create_shortcut); } else { menu.add(0, CONTEXT_MENU_DEFAULT, 0, R.string.my_context_get_route_info); } menu.add(0, CONTEXT_MENU_SHOW_ON_MAP, 0, R.string.my_context_showonmap); final String url = getUrl(getListView(), info.position); if (url != null) { menu.add(0, CONTEXT_MENU_SHOW_URL, 0, R.string.my_context_show_schedule); } } @Override public boolean onContextItemSelected(MenuItem item) { AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo(); switch (item.getItemId()) { case CONTEXT_MENU_DEFAULT: // Fake a click onListItemClick(getListView(), info.targetView, info.position, info.id); return true; case CONTEXT_MENU_SHOW_ON_MAP: HomeActivity.start(getActivity(), getId(getListView(), info.position)); return true; case CONTEXT_MENU_SHOW_URL: UIHelp.goToUrl(getActivity(), getUrl(getListView(), info.position)); return true; default: return super.onContextItemSelected(item); } } private String getId(ListView l, int position) { ListAdapter adapter = l.getAdapter(); ObaRoute route = (ObaRoute) adapter.getItem(position - l.getHeaderViewsCount()); return route.getId(); } private String getUrl(ListView l, int position) { ListAdapter adapter = l.getAdapter(); ObaRoute route = (ObaRoute) adapter.getItem(position - l.getHeaderViewsCount()); return route.getUrl(); } // // Adapter // private static final class MyAdapter extends ArrayAdapter<ObaRoute> { public MyAdapter(Context context) { super(context, R.layout.route_list_item); } @Override protected void initView(View view, ObaRoute route) { UIHelp.setRouteView(view, route); } } // // Loader // private static final class MyLoader extends AsyncTaskLoader<ObaRoutesForLocationResponse> { private final String mQueryText; private final Location mCenter; public MyLoader(Context context, String query, Location center) { super(context); mQueryText = query; mCenter = center; } @Override public ObaRoutesForLocationResponse loadInBackground() { ObaRoutesForLocationResponse response = new ObaRoutesForLocationRequest.Builder(getContext(), mCenter) .setQuery(mQueryText).build().call(); // If there is no results from the user-centered query, // open a wider next in some "default" location //Log.d(TAG, "Server returns: " + response.getCode()); if (response.getCode() == ObaApi.OBA_OK) { ObaRoute[] routes = response.getRoutesForLocation(); if (routes.length != 0) { return response; } } Location center = LocationHelp.getDefaultSearchCenter(); if (center != null) { return new ObaRoutesForLocationRequest.Builder(getContext(), center) .setRadius(LocationHelp.DEFAULT_SEARCH_RADIUS).setQuery(mQueryText).build().call(); } return response; } } }