Java tutorial
/* * Copyright 2013 Ian Kavanagh * * 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 ie.clashoftheash.timetabler.ui; import org.acra.ACRA; import ie.clashoftheash.timetabler.R; import ie.clashoftheash.timetabler.authenticator.AccountUtils; import ie.clashoftheash.timetabler.utils.LoadEvent; import android.app.Activity; import android.app.Fragment; import android.content.Intent; import android.database.Cursor; import android.os.Bundle; import android.support.v4.app.NavUtils; import android.util.Log; import android.view.Menu; import android.view.MenuItem; /** * An activity representing a single Event detail screen. This activity is only * used on handset devices. On tablet-size devices, item details are presented * side-by-side with a list of items in a {@link EventListActivity}. * <p> * This activity is mostly just a 'shell' activity containing nothing more than * a {@link EventDetailFragment}. */ public class EventDetailActivity extends Activity implements LoadEvent.EventLoadListener { private static final String TAG = "EventDetailActivity"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_event_detail); // Show the Up button in the action bar. getActionBar().setDisplayHomeAsUpEnabled(true); // savedInstanceState is non-null when there is fragment state // saved from previous configurations of this activity // (e.g. when rotating the screen from portrait to landscape). // In this case, the fragment will automatically be re-added // to its container so we don't need to manually add it. // For more information, see the Fragments API guide at: // // http://developer.android.com/guide/components/fragments.html // if (savedInstanceState == null) { // Create the detail fragment and add it to the activity // using a fragment transaction. Bundle arguments = new Bundle(); arguments.putLong(EventDetailFragment.ARG_EVENT_ID, getIntent().getLongExtra(EventDetailFragment.ARG_EVENT_ID, -1)); Fragment fragment = new EventDetailFragment(); fragment.setArguments(arguments); getFragmentManager().beginTransaction().add(R.id.event_detail_container, fragment).commit(); } } @Override protected void onResume() { super.onResume(); AccountUtils.checkAccountExists(this); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_event, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.menu_create_event: startActivity(new Intent(this, CreateEventActivity.class)); return true; case R.id.menu_settings: startActivity(new Intent(this, SettingsActivity.class)); return true; case android.R.id.home: // This ID represents the Home or Up button. In the case of this // activity, the Up button is shown. Use NavUtils to allow users // to navigate up one level in the application structure. For // more details, see the Navigation pattern on Android Design: // // http://developer.android.com/design/patterns/navigation.html#up-vs-back // NavUtils.navigateUpTo(this, new Intent(this, EventListActivity.class)); return true; } return super.onOptionsItemSelected(item); } @Override public void OnEventLoadFinished(Cursor c) { try { ((EventDetailFragment) getFragmentManager().findFragmentById(R.id.event_detail_container)) .eventLoaded(c); } catch (NullPointerException e) { // Exception thrown if fragment not attached to an activity, in this // case loaded data not needed, close cursor and finish method Log.w(TAG, "Can't find fragment to add event data to", e); if (c != null) c.close(); ACRA.getErrorReporter().handleSilentException(e); } } }