Java tutorial
/* * Copyright 2013 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 com.feathercoin.wallet.feathercoin.ui; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.content.BroadcastReceiver; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.ServiceConnection; import android.net.Uri; import android.os.Bundle; import android.os.IBinder; import android.support.v4.app.LoaderManager; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.AsyncTaskLoader; import android.support.v4.content.Loader; import android.text.format.DateUtils; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ListView; import android.widget.TextView; import com.actionbarsherlock.app.SherlockListFragment; import com.feathercoin.wallet.feathercoin.Constants; import com.google.feathercoin.core.Block; import com.google.feathercoin.core.StoredBlock; import com.feathercoin.wallet.feathercoin.service.BlockchainService; import com.feathercoin.wallet.feathercoin.service.BlockchainServiceImpl; import com.feathercoin.wallet.feathercoin.util.WalletUtils; import de.schildbach.wallet.feathercoin.R; /** * @author Andreas Schildbach */ public final class BlockListFragment extends SherlockListFragment implements LoaderCallbacks<List<StoredBlock>> { private AbstractWalletActivity activity; private LoaderManager loaderManager; private BlockchainService service; private BlockListAdapter adapter; private final List<StoredBlock> blocks = new ArrayList<StoredBlock>(MAX_BLOCKS); private static final int ID_BLOCK_LOADER = 0; private static final int MAX_BLOCKS = 32; @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 BlockListAdapter(); setListAdapter(adapter); } @Override public void onResume() { super.onResume(); activity.registerReceiver(tickReceiver, new IntentFilter(Intent.ACTION_TIME_TICK)); adapter.notifyDataSetChanged(); } @Override public void onPause() { activity.unregisterReceiver(tickReceiver); super.onPause(); } @Override public void onDestroy() { activity.unbindService(serviceConnection); super.onDestroy(); } @Override public void onListItemClick(final ListView l, final View v, final int position, final long id) { final StoredBlock storedBlock = adapter.getItem(position); final Intent intent = new Intent(Intent.ACTION_VIEW, Uri .parse(Constants.BLOCKEXPLORER_BASE_URL + "search?q=" + storedBlock.getHeader().getHashAsString())); startActivity(intent); } private final ServiceConnection serviceConnection = new ServiceConnection() { public void onServiceConnected(final ComponentName name, final IBinder binder) { service = ((BlockchainServiceImpl.LocalBinder) binder).getService(); loaderManager.initLoader(ID_BLOCK_LOADER, null, BlockListFragment.this); } 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 final class BlockListAdapter extends BaseAdapter { public int getCount() { return blocks.size(); } public StoredBlock getItem(final int position) { return blocks.get(position); } public long getItemId(final int position) { return WalletUtils.longHash(blocks.get(position).getHeader().getHash()); } @Override public boolean hasStableIds() { return true; } public View getView(final int position, View row, final ViewGroup parent) { if (row == null) row = getLayoutInflater(null).inflate(R.layout.block_list_row, null); final StoredBlock storedBlock = getItem(position); final Block header = storedBlock.getHeader(); final TextView rowHeight = (TextView) row.findViewById(R.id.block_list_row_height); final int height = storedBlock.getHeight(); rowHeight.setText(Integer.toString(height)); final TextView rowTime = (TextView) row.findViewById(R.id.block_list_row_time); final long timeMs = header.getTimeSeconds() * DateUtils.SECOND_IN_MILLIS; rowTime.setText(DateUtils.getRelativeDateTimeString(activity, timeMs, DateUtils.MINUTE_IN_MILLIS, DateUtils.WEEK_IN_MILLIS, 0)); final TextView rowHash = (TextView) row.findViewById(R.id.block_list_row_hash); rowHash.setText(WalletUtils.formatHash(null, header.getHashAsString(), 8, 0, ' ')); return row; } } public Loader<List<StoredBlock>> onCreateLoader(final int id, final Bundle args) { return new BlockLoader(activity, service); } public void onLoadFinished(final Loader<List<StoredBlock>> loader, final List<StoredBlock> blocks) { BlockListFragment.this.blocks.clear(); BlockListFragment.this.blocks.addAll(blocks); adapter.notifyDataSetChanged(); } public void onLoaderReset(final Loader<List<StoredBlock>> loader) { blocks.clear(); adapter.notifyDataSetChanged(); } private static class BlockLoader extends AsyncTaskLoader<List<StoredBlock>> { private Context context; private BlockchainService service; private BlockLoader(final Context context, final BlockchainService service) { super(context); this.context = context.getApplicationContext(); this.service = service; } @Override protected void onStartLoading() { super.onStartLoading(); context.registerReceiver(broadcastReceiver, new IntentFilter(BlockchainService.ACTION_BLOCKCHAIN_STATE)); } @Override protected void onStopLoading() { context.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) { forceLoad(); } }; } }