Java tutorial
/* * Copyright 2011-2012 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 piuk.blockchain.android.ui; import java.math.BigDecimal; import java.math.BigInteger; import java.text.DecimalFormat; import android.content.SharedPreferences; import android.database.Cursor; import android.graphics.Color; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v4.app.ListFragment; import android.support.v4.app.LoaderManager; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.support.v4.widget.SimpleCursorAdapter; import android.support.v4.widget.SimpleCursorAdapter.ViewBinder; import android.view.View; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.ListAdapter; import android.widget.ListView; import android.widget.TextView; import piuk.EventListeners; import piuk.blockchain.android.R; import piuk.blockchain.android.Constants; import piuk.blockchain.android.ExchangeRatesProvider; import piuk.blockchain.android.WalletApplication; /** * @author Andreas Schildbach */ public final class ExchangeRatesFragment extends ListFragment implements LoaderManager.LoaderCallbacks<Cursor> { private WalletApplication application; private SharedPreferences prefs; private SimpleCursorAdapter adapter; private final DecimalFormat format = new DecimalFormat("#.##"); private final EventListeners.EventListener walletEventListener = new EventListeners.EventListener() { @Override public String getDescription() { return "Exchange Rates Listener"; } @Override public void onWalletDidChange() { try { updateView(); } catch (Exception e) { e.printStackTrace(); } } }; @Override public void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); application = (WalletApplication) getActivity().getApplication(); EventListeners.addEventListener(walletEventListener); } @Override public void onActivityCreated(final Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); prefs = PreferenceManager.getDefaultSharedPreferences(getActivity()); setEmptyText(getString(R.string.exchange_rates_fragment_empty_text)); adapter = new SimpleCursorAdapter(getActivity(), R.layout.exchange_rate_row, null, new String[] { ExchangeRatesProvider.KEY_CURRENCY_CODE, ExchangeRatesProvider.KEY_EXCHANGE_RATE_15M, ExchangeRatesProvider.KEY_EXCHANGE_RATE_24H, ExchangeRatesProvider.KEY_EXCHANGE_RATE_SYMBOL }, new int[] { R.id.exchange_rate_currency_code, R.id.exchange_rate_value, R.id.exchange_up_down, R.id.exchange_rate_symbol }, 0); adapter.setViewBinder(new ViewBinder() { public boolean setViewValue(final View view, final Cursor cursor, final int columnIndex) { String columnName = cursor.getColumnName(columnIndex); if (columnName.equals(ExchangeRatesProvider.KEY_CURRENCY_CODE)) { return false; } else if (columnName.equals(ExchangeRatesProvider.KEY_EXCHANGE_RATE_15M)) { final TextView valueView = (TextView) view; final double _15m = cursor.getDouble(columnIndex); valueView.setText(format.format(_15m)); return true; } else if (columnName.equals(ExchangeRatesProvider.KEY_EXCHANGE_RATE_15M)) { final TextView valueView = (TextView) view; final String symbol = cursor.getString(columnIndex); valueView.setText(symbol); return true; } else if (columnName.equals(ExchangeRatesProvider.KEY_EXCHANGE_RATE_24H)) { final ImageView image = (ImageView) view; double _15MValue = cursor .getDouble(cursor.getColumnIndex(ExchangeRatesProvider.KEY_EXCHANGE_RATE_15M)); double _24HValue = cursor.getDouble(columnIndex); if (_15MValue > _24HValue) { image.setImageResource(R.drawable.icon_up_green); } else if (_15MValue < _24HValue) { image.setImageResource(R.drawable.icon_down_red); } else { image.setImageResource(R.drawable.icon_right_black); } return true; } return false; } }); setListAdapter(adapter); getLoaderManager().initLoader(0, null, this); } @Override public void onResume() { super.onResume(); updateView(); } @Override public void onDestroy() { EventListeners.removeEventListener(walletEventListener); super.onDestroy(); } @Override public void onListItemClick(final ListView l, final View v, final int position, final long id) { final Cursor cursor = (Cursor) adapter.getItem(position); final String currencyCode = cursor .getString(cursor.getColumnIndexOrThrow(ExchangeRatesProvider.KEY_CURRENCY_CODE)); prefs.edit().putString(Constants.PREFS_KEY_EXCHANGE_CURRENCY, currencyCode).commit(); final WalletBalanceFragment walletBalanceFragment = (WalletBalanceFragment) getFragmentManager() .findFragmentById(R.id.wallet_balance_fragment); if (walletBalanceFragment != null) { walletBalanceFragment.updateView(); } new Thread(new Runnable() { @Override public void run() { try { application.getRemoteWallet().updateRemoteCurrency(currencyCode); application.doMultiAddr(true); } catch (Exception e) { e.printStackTrace(); } } }).start(); getActivity().finish(); } private void updateView() { final ListAdapter adapter = getListAdapter(); if (adapter != null) ((BaseAdapter) adapter).notifyDataSetChanged(); } public Loader<Cursor> onCreateLoader(final int id, final Bundle args) { return new CursorLoader(getActivity(), ExchangeRatesProvider.CONTENT_URI, null, null, null, null); } public void onLoadFinished(final Loader<Cursor> loader, final Cursor data) { adapter.swapCursor(data); } public void onLoaderReset(final Loader<Cursor> loader) { adapter.swapCursor(null); } }