Java tutorial
/* * Copyright 2012-2014 the original author or authors. * * 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 biz.wiz.android.wallet.ui; import java.net.InetAddress; import java.util.List; import java.util.Map; import java.util.WeakHashMap; import java.util.concurrent.RejectedExecutionException; import javax.annotation.Nonnull; import org.bitcoinj.core.Peer; import org.bitcoinj.core.VersionMessage; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import android.app.Activity; import android.app.LoaderManager; import android.app.LoaderManager.LoaderCallbacks; import android.content.AsyncTaskLoader; import android.content.BroadcastReceiver; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.Loader; import android.content.ServiceConnection; import android.graphics.Typeface; import android.os.Bundle; import android.os.Handler; import android.os.IBinder; import android.support.v4.content.LocalBroadcastManager; import android.text.format.DateUtils; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.TextView; import biz.wiz.android.wallet.service.BlockchainService; import biz.wiz.android.wallet.service.BlockchainServiceImpl; import biz.wiz.android.wallet.util.WholeStringBuilder; import biz.wiz.android.wallet_test.R; /** * @author Andreas Schildbach */ public final class PeerListFragment extends FancyListFragment { private AbstractWalletActivity activity; private LoaderManager loaderManager; private BlockchainService service; private ArrayAdapter<Peer> adapter; private final Handler handler = new Handler(); private static final long REFRESH_MS = DateUtils.SECOND_IN_MILLIS; private static final int ID_PEER_LOADER = 0; private static final int ID_REVERSE_DNS_LOADER = 1; private final Map<InetAddress, String> hostnames = new WeakHashMap<InetAddress, String>(); private static final Logger log = LoggerFactory.getLogger(PeerListFragment.class); @Override public void onAttach(final Activity activity) { super.onAttach(activity); this.activity = (AbstractWalletActivity) activity; this.loaderManager = getLoaderManager(); } @Override public void onActivityCreated(final Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); activity.bindService(new Intent(activity, BlockchainServiceImpl.class), serviceConnection, Context.BIND_AUTO_CREATE); } @Override public void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); adapter = new ArrayAdapter<Peer>(activity, 0) { private final LayoutInflater inflater = LayoutInflater.from(activity); @Override public View getView(final int position, View row, final ViewGroup parent) { if (row == null) row = inflater.inflate(R.layout.peer_list_row, null); final Peer peer = getItem(position); final VersionMessage versionMessage = peer.getPeerVersionMessage(); final boolean isDownloading = peer.getDownloadData(); final TextView rowIp = (TextView) row.findViewById(R.id.peer_list_row_ip); final InetAddress address = peer.getAddress().getAddr(); final String hostname = hostnames.get(address); rowIp.setText(hostname != null ? hostname : address.getHostAddress()); final TextView rowHeight = (TextView) row.findViewById(R.id.peer_list_row_height); final long bestHeight = peer.getBestHeight(); rowHeight.setText(bestHeight > 0 ? bestHeight + " blocks" : null); rowHeight.setTypeface(isDownloading ? Typeface.DEFAULT_BOLD : Typeface.DEFAULT); final TextView rowVersion = (TextView) row.findViewById(R.id.peer_list_row_version); rowVersion.setText(versionMessage.subVer); rowVersion.setTypeface(isDownloading ? Typeface.DEFAULT_BOLD : Typeface.DEFAULT); final TextView rowProtocol = (TextView) row.findViewById(R.id.peer_list_row_protocol); rowProtocol.setText("protocol: " + versionMessage.clientVersion); rowProtocol.setTypeface(isDownloading ? Typeface.DEFAULT_BOLD : Typeface.DEFAULT); final TextView rowPing = (TextView) row.findViewById(R.id.peer_list_row_ping); final long pingTime = peer.getPingTime(); rowPing.setText( pingTime < Long.MAX_VALUE ? getString(R.string.peer_list_row_ping_time, pingTime) : null); rowPing.setTypeface(isDownloading ? Typeface.DEFAULT_BOLD : Typeface.DEFAULT); return row; } @Override public boolean isEnabled(final int position) { return false; } }; setListAdapter(adapter); } @Override public void onResume() { super.onResume(); handler.postDelayed(new Runnable() { @Override public void run() { adapter.notifyDataSetChanged(); final Loader<String> loader = loaderManager.getLoader(ID_REVERSE_DNS_LOADER); final boolean loaderRunning = loader != null && loader.isStarted(); if (!loaderRunning) { for (int i = 0; i < adapter.getCount(); i++) { final Peer peer = adapter.getItem(i); final InetAddress address = peer.getAddress().getAddr(); if (!hostnames.containsKey(address)) { final Bundle args = new Bundle(); args.putSerializable("address", address); loaderManager.initLoader(ID_REVERSE_DNS_LOADER, args, reverseDnsLoaderCallbacks) .forceLoad(); break; } } } handler.postDelayed(this, REFRESH_MS); } }, REFRESH_MS); } @Override public void onPause() { handler.removeCallbacksAndMessages(null); super.onPause(); } @Override public void onDestroy() { activity.unbindService(serviceConnection); loaderManager.destroyLoader(ID_REVERSE_DNS_LOADER); super.onDestroy(); } private final ServiceConnection serviceConnection = new ServiceConnection() { @Override public void onServiceConnected(final ComponentName name, final IBinder binder) { service = ((BlockchainServiceImpl.LocalBinder) binder).getService(); loaderManager.initLoader(ID_PEER_LOADER, null, peerLoaderCallbacks); } @Override public void onServiceDisconnected(final ComponentName name) { loaderManager.destroyLoader(ID_PEER_LOADER); service = null; } }; private static class PeerLoader extends AsyncTaskLoader<List<Peer>> { private LocalBroadcastManager broadcastManager; private BlockchainService service; private PeerLoader(final Context context, @Nonnull final BlockchainService service) { super(context); this.broadcastManager = LocalBroadcastManager.getInstance(context.getApplicationContext()); this.service = service; } @Override protected void onStartLoading() { super.onStartLoading(); broadcastManager.registerReceiver(broadcastReceiver, new IntentFilter(BlockchainService.ACTION_PEER_STATE)); forceLoad(); } @Override protected void onStopLoading() { broadcastManager.unregisterReceiver(broadcastReceiver); super.onStopLoading(); } @Override public List<Peer> loadInBackground() { return service.getConnectedPeers(); } private final BroadcastReceiver broadcastReceiver = new BroadcastReceiver() { @Override public void onReceive(final Context context, final Intent intent) { try { forceLoad(); } catch (final RejectedExecutionException x) { log.info("rejected execution: " + PeerLoader.this.toString()); } } }; } private final LoaderCallbacks<List<Peer>> peerLoaderCallbacks = new LoaderCallbacks<List<Peer>>() { @Override public Loader<List<Peer>> onCreateLoader(final int id, final Bundle args) { return new PeerLoader(activity, service); } @Override public void onLoadFinished(final Loader<List<Peer>> loader, final List<Peer> peers) { adapter.clear(); if (peers != null) for (final Peer peer : peers) adapter.add(peer); setEmptyText(WholeStringBuilder.bold(getString(R.string.peer_list_fragment_empty))); } @Override public void onLoaderReset(final Loader<List<Peer>> loader) { adapter.clear(); } }; private static class ReverseDnsLoader extends AsyncTaskLoader<String> { public final InetAddress address; public ReverseDnsLoader(final Context context, @Nonnull final InetAddress address) { super(context); this.address = address; } @Override public String loadInBackground() { return address.getCanonicalHostName(); } } private final LoaderCallbacks<String> reverseDnsLoaderCallbacks = new LoaderCallbacks<String>() { @Override public Loader<String> onCreateLoader(final int id, final Bundle args) { final InetAddress address = (InetAddress) args.getSerializable("address"); return new ReverseDnsLoader(activity, address); } @Override public void onLoadFinished(final Loader<String> loader, final String hostname) { final InetAddress address = ((ReverseDnsLoader) loader).address; hostnames.put(address, hostname); loaderManager.destroyLoader(ID_REVERSE_DNS_LOADER); } @Override public void onLoaderReset(final Loader<String> loader) { } }; }