Java tutorial
/* * Copyright 2013-2015 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 systems.soapbox.ombuds.client.ui; import android.app.Activity; import android.app.Fragment; 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.net.Uri; import android.os.Bundle; import android.os.IBinder; import android.support.v4.content.LocalBroadcastManager; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.PopupMenu; import android.widget.PopupMenu.OnMenuItemClickListener; import android.widget.ViewAnimator; import org.bitcoinj.core.Sha256Hash; import org.bitcoinj.core.StoredBlock; import org.bitcoinj.core.Transaction; import org.bitcoinj.core.Wallet; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.util.HashSet; import java.util.List; import java.util.Map; import java.util.Set; import java.util.concurrent.RejectedExecutionException; import systems.soapbox.ombuds.client.Configuration; import systems.soapbox.ombuds.client.WalletApplication; import systems.soapbox.ombuds.client.btc.service.BlockchainService; import systems.soapbox.ombuds.client.btc.service.BlockchainServiceImpl; import systems.soapbox.ombuds.client_test.R; /** * @author Andreas Schildbach */ public final class BlockListFragment extends Fragment implements BlockListAdapter.OnClickListener { private AbstractWalletActivity activity; private WalletApplication application; private Configuration config; private Wallet wallet; private LoaderManager loaderManager; private BlockchainService service; private ViewAnimator viewGroup; private RecyclerView recyclerView; private BlockListAdapter adapter; private static final int ID_BLOCK_LOADER = 0; private static final int ID_TRANSACTION_LOADER = 1; private static final int MAX_BLOCKS = 32; private static final Logger log = LoggerFactory.getLogger(BlockListFragment.class); @Override public void onAttach(final Activity activity) { super.onAttach(activity); this.activity = (AbstractWalletActivity) activity; this.application = this.activity.getWalletApplication(); this.config = application.getConfiguration(); this.wallet = application.getWallet(); 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 BlockListAdapter(activity, wallet, this); adapter.setFormat(config.getFormat()); } @Override public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) { final View view = inflater.inflate(R.layout.block_list_fragment, container, false); viewGroup = (ViewAnimator) view.findViewById(R.id.block_list_group); recyclerView = (RecyclerView) view.findViewById(R.id.block_list); recyclerView.setLayoutManager(new LinearLayoutManager(activity)); recyclerView.setAdapter(adapter); return view; } private boolean resumed = false; @Override public void onResume() { super.onResume(); activity.registerReceiver(tickReceiver, new IntentFilter(Intent.ACTION_TIME_TICK)); loaderManager.initLoader(ID_TRANSACTION_LOADER, null, transactionLoaderCallbacks); adapter.notifyDataSetChanged(); resumed = true; } @Override public void onPause() { // workaround: under high load, it can happen that onPause() is called twice (recursively via destroyLoader) if (resumed) { resumed = false; loaderManager.destroyLoader(ID_TRANSACTION_LOADER); activity.unregisterReceiver(tickReceiver); } else { log.warn("onPause() called without onResume(), appending stack trace", new RuntimeException()); } super.onPause(); } @Override public void onDestroy() { activity.unbindService(serviceConnection); super.onDestroy(); } @Override public void onBlockMenuClick(final View view, final StoredBlock block) { final PopupMenu popupMenu = new PopupMenu(activity, view); popupMenu.inflate(R.menu.blocks_context); popupMenu.setOnMenuItemClickListener(new OnMenuItemClickListener() { @Override public boolean onMenuItemClick(final MenuItem item) { switch (item.getItemId()) { case R.id.blocks_context_browse: startActivity(new Intent(Intent.ACTION_VIEW, Uri.withAppendedPath(config.getBlockExplorer(), "block/" + block.getHeader().getHashAsString()))); return true; } return false; } }); popupMenu.show(); } private final ServiceConnection serviceConnection = new ServiceConnection() { @Override public void onServiceConnected(final ComponentName name, final IBinder binder) { service = ((BlockchainServiceImpl.LocalBinder) binder).getService(); loaderManager.initLoader(ID_BLOCK_LOADER, null, blockLoaderCallbacks); } @Override public void onServiceDisconnected(final ComponentName name) { loaderManager.destroyLoader(ID_BLOCK_LOADER); service = null; } }; private final BroadcastReceiver tickReceiver = new BroadcastReceiver() { @Override public void onReceive(final Context context, final Intent intent) { adapter.notifyDataSetChanged(); } }; private static class BlockLoader extends AsyncTaskLoader<List<StoredBlock>> { private LocalBroadcastManager broadcastManager; private BlockchainService service; private BlockLoader(final Context context, 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_BLOCKCHAIN_STATE)); forceLoad(); } @Override protected void onStopLoading() { broadcastManager.unregisterReceiver(broadcastReceiver); super.onStopLoading(); } @Override public List<StoredBlock> loadInBackground() { return service.getRecentBlocks(MAX_BLOCKS); } 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: " + BlockLoader.this.toString()); } } }; } private final LoaderCallbacks<List<StoredBlock>> blockLoaderCallbacks = new LoaderCallbacks<List<StoredBlock>>() { @Override public Loader<List<StoredBlock>> onCreateLoader(final int id, final Bundle args) { return new BlockLoader(activity, service); } @Override public void onLoadFinished(final Loader<List<StoredBlock>> loader, final List<StoredBlock> blocks) { adapter.replace(blocks); viewGroup.setDisplayedChild(1); final Loader<Set<Transaction>> transactionLoader = loaderManager.getLoader(ID_TRANSACTION_LOADER); if (transactionLoader != null && transactionLoader.isStarted()) transactionLoader.forceLoad(); } @Override public void onLoaderReset(final Loader<List<StoredBlock>> loader) { adapter.clear(); } }; private static class TransactionsLoader extends AsyncTaskLoader<Set<Transaction>> { private final Wallet wallet; private TransactionsLoader(final Context context, final Wallet wallet) { super(context); this.wallet = wallet; } @Override public Set<Transaction> loadInBackground() { final Set<Transaction> transactions = wallet.getTransactions(true); final Set<Transaction> filteredTransactions = new HashSet<Transaction>(transactions.size()); for (final Transaction tx : transactions) { final Map<Sha256Hash, Integer> appearsIn = tx.getAppearsInHashes(); if (appearsIn != null && !appearsIn.isEmpty()) // TODO filter by updateTime filteredTransactions.add(tx); } return filteredTransactions; } } private final LoaderCallbacks<Set<Transaction>> transactionLoaderCallbacks = new LoaderCallbacks<Set<Transaction>>() { @Override public Loader<Set<Transaction>> onCreateLoader(final int id, final Bundle args) { return new TransactionsLoader(activity, wallet); } @Override public void onLoadFinished(final Loader<Set<Transaction>> loader, final Set<Transaction> transactions) { adapter.replaceTransactions(transactions); } @Override public void onLoaderReset(final Loader<Set<Transaction>> loader) { adapter.clearTransactions(); } }; }