Java tutorial
/* * NeighborListFragment.java * * Copyright (C) 2011 IBR, TU Braunschweig * * Written-by: Johannes Morgenroth <morgenroth@ibr.cs.tu-bs.de> * * This program 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 de.tubs.ibr.dtn.daemon; import java.util.List; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.ServiceConnection; import android.os.Bundle; import android.os.IBinder; import android.os.Parcelable; import android.support.v4.app.ListFragment; import android.support.v4.app.LoaderManager; import android.support.v4.content.Loader; import android.util.Log; import android.view.ContextMenu; import android.view.ContextMenu.ContextMenuInfo; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.widget.AdapterView; import android.widget.ListView; import android.widget.Toast; import de.tubs.ibr.dtn.DTNService; import de.tubs.ibr.dtn.R; import de.tubs.ibr.dtn.api.Node; import de.tubs.ibr.dtn.daemon.data.NeighborListAdapter; import de.tubs.ibr.dtn.daemon.data.NeighborListLoader; import de.tubs.ibr.dtn.keyexchange.KeyInformationActivity; import de.tubs.ibr.dtn.service.DaemonService; public class NeighborListFragment extends ListFragment implements LoaderManager.LoaderCallbacks<List<Node>> { // The loader's unique id. Loader ids are specific to the Activity or // Fragment in which they reside. private static final int LOADER_ID = 1; private static final String TAG = "NeighborListFragment"; private DTNService mService = null; private NeighborListAdapter mAdapter = null; private ServiceConnection mConnection = new ServiceConnection() { public void onServiceConnected(ComponentName name, IBinder s) { mService = DTNService.Stub.asInterface(s); if (Log.isLoggable(TAG, Log.DEBUG)) Log.d(TAG, "service connected"); // initialize the loader getLoaderManager().initLoader(LOADER_ID, null, NeighborListFragment.this); } public void onServiceDisconnected(ComponentName name) { getLoaderManager().destroyLoader(LOADER_ID); mService = null; if (Log.isLoggable(TAG, Log.DEBUG)) Log.d(TAG, "service disconnected"); } }; @Override public void onListItemClick(ListView l, View v, int position, long id) { NeighborListAdapter nla = (NeighborListAdapter) getListAdapter(); Node n = (Node) nla.getItem(position); // call external apps to handle the endpoint final Intent intent = new Intent(de.tubs.ibr.dtn.Intent.ENDPOINT_INTERACT); intent.addCategory(Intent.CATEGORY_DEFAULT); intent.putExtra(de.tubs.ibr.dtn.Intent.EXTRA_ENDPOINT, n.endpoint.toString()); try { getActivity().startActivity(intent); } catch (android.content.ActivityNotFoundException ex) { // no activity found to handle the request Toast.makeText(getActivity(), getString(R.string.toast_no_application), Toast.LENGTH_SHORT).show(); } // call super-method super.onListItemClick(l, v, position, id); } @Override public void onPause() { // Detach our existing connection. getActivity().unbindService(mConnection); super.onPause(); } @Override public void onResume() { super.onResume(); // Establish a connection with the service. We use an explicit // class name because we want a specific service implementation that // we know will be running in our own process (and thus won't be // supporting component replacement by other applications). Intent bindIntent = DaemonService.createDtnServiceIntent(getActivity()); getActivity().bindService(bindIntent, mConnection, Context.BIND_AUTO_CREATE); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); // We have a menu item to show in action bar. setHasOptionsMenu(true); // register context menu registerForContextMenu(this.getListView()); // set text for empty listview setEmptyText(getActivity().getResources().getString(R.string.list_no_neighbors)); // create a new list adapter mAdapter = new NeighborListAdapter(getActivity()); // set listview adapter setListAdapter(mAdapter); // Start out with a progress indicator. setListShown(false); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { super.onCreateOptionsMenu(menu, inflater); inflater.inflate(R.menu.neighbor_menu, menu); } @Override public boolean onContextItemSelected(MenuItem item) { AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo(); NeighborListAdapter nla = (NeighborListAdapter) getListAdapter(); Node n = (Node) nla.getItem(info.position); switch (item.getItemId()) { case R.id.itemConnect: { // initiate connection via intent final Intent intent = new Intent(getActivity(), DaemonService.class); intent.setAction(de.tubs.ibr.dtn.service.DaemonService.ACTION_INITIATE_CONNECTION); intent.putExtra(de.tubs.ibr.dtn.Intent.EXTRA_ENDPOINT, n.endpoint.toString()); getActivity().startService(intent); return true; } case R.id.itemKeyInfo: { // open keyinfo panel final Intent intent = new Intent(getActivity(), KeyInformationActivity.class); intent.putExtra(de.tubs.ibr.dtn.Intent.EXTRA_ENDPOINT, (Parcelable) n.endpoint); getActivity().startActivity(intent); return true; } default: return super.onContextItemSelected(item); } } @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) { super.onCreateContextMenu(menu, v, menuInfo); MenuInflater inflater = this.getActivity().getMenuInflater(); inflater.inflate(R.menu.neighbor_menu_item, menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.itemDiscovery: { // start discovery final Intent discoIntent = new Intent(getActivity(), DaemonService.class); discoIntent.setAction(de.tubs.ibr.dtn.service.DaemonService.ACTION_START_DISCOVERY); discoIntent.putExtra(DaemonService.EXTRA_DISCOVERY_DURATION, 120L); getActivity().startService(discoIntent); } default: return super.onOptionsItemSelected(item); } } @Override public Loader<List<Node>> onCreateLoader(int id, Bundle args) { return new NeighborListLoader(getActivity(), mService); } @Override public void onLoadFinished(Loader<List<Node>> loader, List<Node> neighbors) { synchronized (mAdapter) { mAdapter.swapList(neighbors); } // The list should now be shown. if (isResumed()) { setListShown(true); } else { setListShownNoAnimation(true); } } @Override public void onLoaderReset(Loader<List<Node>> loader) { } }