Java tutorial
package com.mygeopay.wallet.ui; /* * Copyright 2011-2014 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/>. */ import android.app.Activity; import android.content.Context; import android.content.SharedPreferences; import android.content.SharedPreferences.OnSharedPreferenceChangeListener; import android.database.Cursor; import android.net.Uri; import android.os.Bundle; import android.support.v4.app.ListFragment; import android.support.v4.app.LoaderManager; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.CursorLoader; import android.support.v4.content.Loader; import android.support.v4.widget.ResourceCursorAdapter; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import com.mygeopay.core.coins.BitcoinMain; import com.mygeopay.core.coins.CoinID; import com.mygeopay.core.coins.CoinType; import com.mygeopay.core.coins.Value; import com.mygeopay.core.util.GenericUtils; import com.mygeopay.wallet.Configuration; import com.mygeopay.wallet.Constants; import com.mygeopay.wallet.ExchangeRatesProvider; import com.mygeopay.wallet.ExchangeRatesProvider.ExchangeRate; import com.mygeopay.wallet.R; import com.mygeopay.wallet.WalletApplication; import com.mygeopay.wallet.ui.widget.Amount; import com.mygeopay.wallet.ui.widget.CurrencyTextView; import com.mygeopay.wallet.util.WalletUtils; import org.bitcoinj.core.Coin; import javax.annotation.CheckForNull; /** * @author Andreas Schildbach * @author John L. Jegutanis */ public final class ExchangeRatesFragment extends ListFragment implements OnSharedPreferenceChangeListener { private Activity activity; private WalletApplication application; private Configuration config; private com.mygeopay.core.wallet.Wallet wallet; private Uri contentUri; private LoaderManager loaderManager; private ExchangeRatesAdapter adapter; private String query = null; private Coin balance = null; @CheckForNull private String defaultCurrency = null; private static final int ID_BALANCE_LOADER = 0; private static final int ID_RATE_LOADER = 1; private static final int ID_BLOCKCHAIN_STATE_LOADER = 2; private CoinType type; @Override public void onAttach(final Activity activity) { super.onAttach(activity); this.activity = activity; this.application = (WalletApplication) activity.getApplication(); this.config = application.getConfiguration(); this.wallet = application.getWallet(); this.loaderManager = getLoaderManager(); } @Override public void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); if (getArguments() != null && getArguments().containsKey(Constants.ARG_COIN_ID)) { type = CoinID.typeFromId(getArguments().getString(Constants.ARG_COIN_ID)); } else { type = BitcoinMain.get(); } contentUri = ExchangeRatesProvider.contentUriToLocal(activity.getPackageName(), type.getSymbol(), false); defaultCurrency = config.getExchangeCurrencyCode(); config.registerOnSharedPreferenceChangeListener(this); adapter = new ExchangeRatesAdapter(activity); setListAdapter(adapter); loaderManager.initLoader(ID_RATE_LOADER, null, rateLoaderCallbacks); } @Override public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) { return inflater.inflate(R.layout.fragment_exchange_rates, container, false); } @Override public void setEmptyText(final CharSequence text) { final TextView emptyView = (TextView) getView().findViewById(android.R.id.empty); emptyView.setText(text); } @Override public void onViewCreated(final View view, final Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); getListView().setFastScrollEnabled(true); setEmptyText(getString(R.string.exchange_rates_loading)); } @Override public void onResume() { super.onResume(); // loaderManager.initLoader(ID_BALANCE_LOADER, null, balanceLoaderCallbacks); // loaderManager.initLoader(ID_BLOCKCHAIN_STATE_LOADER, null, blockchainStateLoaderCallbacks); updateView(); } @Override public void onPause() { // loaderManager.destroyLoader(ID_BALANCE_LOADER); // loaderManager.destroyLoader(ID_BLOCKCHAIN_STATE_LOADER); super.onPause(); } @Override public void onDestroy() { config.unregisterOnSharedPreferenceChangeListener(this); loaderManager.destroyLoader(ID_RATE_LOADER); super.onDestroy(); } // // @Override // public void onCreateOptionsMenu(final Menu menu, final MenuInflater inflater) { // inflater.inflate(R.menu.exchange_rates_fragment_options, menu); // // final SearchView searchView = (SearchView) menu.findItem(R.id.exchange_rates_options_search).getActionView(); // searchView.setOnQueryTextListener(new OnQueryTextListener() { // @Override // public boolean onQueryTextChange(final String newText) { // query = newText.trim(); // if (query.isEmpty()) // query = null; // // getLoaderManager().restartLoader(ID_RATE_LOADER, null, rateLoaderCallbacks); // // return true; // } // // @Override // public boolean onQueryTextSubmit(final String query) { // searchView.clearFocus(); // // return true; // } // }); // // super.onCreateOptionsMenu(menu, inflater); // } // @Override public void onListItemClick(final ListView l, final View v, final int position, final long id) { final Cursor cursor = (Cursor) adapter.getItem(position); final ExchangeRate exchangeRate = ExchangeRatesProvider.getExchangeRate(cursor); defaultCurrency = exchangeRate.currencyCodeId; config.setExchangeCurrencyCode(defaultCurrency); updateView(); Toast.makeText(getActivity(), getString(R.string.set_local_currency, defaultCurrency), Toast.LENGTH_SHORT) .show(); getActivity().finish(); } @Override public void onSharedPreferenceChanged(final SharedPreferences sharedPreferences, final String key) { if (Configuration.PREFS_KEY_EXCHANGE_CURRENCY.equals(key)) { defaultCurrency = config.getExchangeCurrencyCode(); updateView(); } } private void updateView() { // balance = application.getWallet().getBalance(BalanceType.ESTIMATED); if (adapter != null && type != null) { adapter.setRateBase(type.getOneCoin()); } } private final LoaderCallbacks<Cursor> rateLoaderCallbacks = new LoaderManager.LoaderCallbacks<Cursor>() { @Override public Loader<Cursor> onCreateLoader(final int id, final Bundle args) { if (query == null) { return new CursorLoader(activity, contentUri, null, null, null, null); } else { return new CursorLoader(activity, contentUri, null, null, null, null); // return new CursorLoader(activity, contentUri, null, ExchangeRatesProvider.QUERY_PARAM_Q, new String[]{query}, null); } } @Override public void onLoadFinished(final Loader<Cursor> loader, final Cursor data) { final Cursor oldCursor = adapter.swapCursor(data); if (data != null && oldCursor == null && defaultCurrency != null) { final int defaultCurrencyPosition = findCurrencyCode(data, defaultCurrency); if (defaultCurrencyPosition >= 0) getListView().setSelection(defaultCurrencyPosition); // scroll to selection } setEmptyText(getString( query != null ? R.string.exchange_rates_empty_search : R.string.exchange_rates_load_error)); } @Override public void onLoaderReset(final Loader<Cursor> loader) { } private int findCurrencyCode(final Cursor cursor, final String currencyCode) { final int currencyCodeColumn = cursor.getColumnIndexOrThrow(ExchangeRatesProvider.KEY_CURRENCY_ID); cursor.moveToPosition(-1); while (cursor.moveToNext()) { if (cursor.getString(currencyCodeColumn).equals(currencyCode)) return cursor.getPosition(); } return -1; } }; // // private final LoaderCallbacks<Coin> balanceLoaderCallbacks = new LoaderManager.LoaderCallbacks<Coin>() { // @Override // public Loader<Coin> onCreateLoader(final int id, final Bundle args) { // return new WalletBalanceLoader(activity, wallet); // } // // @Override // public void onLoadFinished(final Loader<Coin> loader, final Coin balance) { // ExchangeRatesFragment.this.balance = balance; // // updateView(); // } // // @Override // public void onLoaderReset(final Loader<Coin> loader) { // } // }; // // private final LoaderCallbacks<BlockchainState> blockchainStateLoaderCallbacks = new LoaderManager.LoaderCallbacks<BlockchainState>() { // @Override // public Loader<BlockchainState> onCreateLoader(final int id, final Bundle args) { // return new BlockchainStateLoader(activity); // } // // @Override // public void onLoadFinished(final Loader<BlockchainState> loader, final BlockchainState blockchainState) { // ExchangeRatesFragment.this.blockchainState = blockchainState; // // updateView(); // } // // @Override // public void onLoaderReset(final Loader<BlockchainState> loader) { // } // }; // private final class ExchangeRatesAdapter extends ResourceCursorAdapter { private Coin rateBase = Coin.COIN; private ExchangeRatesAdapter(final Context context) { super(context, R.layout.exchange_rate_row, null, true); } public void setRateBase(final Coin rateBase) { this.rateBase = rateBase; notifyDataSetChanged(); } @Override public void bindView(final View view, final Context context, final Cursor cursor) { final ExchangeRate exchangeRate = ExchangeRatesProvider.getExchangeRate(cursor); final boolean isDefaultCurrency = exchangeRate.currencyCodeId.equals(defaultCurrency); view.setBackgroundResource(isDefaultCurrency ? R.color.bg_list_selected : R.color.bg_list); // final View defaultView = view.findViewById(R.id.exchange_rate_row_default); // defaultView.setVisibility(isDefaultCurrency ? View.VISIBLE : View.INVISIBLE); final TextView currencyCodeView = (TextView) view.findViewById(R.id.exchange_rate_row_currency_code); currencyCodeView.setText(exchangeRate.currencyCodeId); final TextView currencyNameView = (TextView) view.findViewById(R.id.exchange_rate_row_currency_name); String currencyName = WalletUtils.getCurrencyName(exchangeRate.currencyCodeId); if (currencyName != null) { currencyNameView.setText(currencyName); currencyNameView.setVisibility(View.VISIBLE); } else { currencyNameView.setText(null); currencyNameView.setVisibility(View.INVISIBLE); } // final CurrencyTextView rateView = (CurrencyTextView) view.findViewById(R.id.exchange_rate_row_rate); // rateView.setFormat(Constants.LOCAL_CURRENCY_FORMAT); // rateView.setAmount(exchangeRate.rate.coinToFiat(rateBase)); final Amount rateAmountUnitView = (Amount) view.findViewById(R.id.exchange_rate_row_rate_unit); rateAmountUnitView.setAmount(GenericUtils.formatCoinValue(type, rateBase, true)); rateAmountUnitView.setSymbol(type.getSymbol()); final Amount rateAmountView = (Amount) view.findViewById(R.id.exchange_rate_row_rate); Value fiatAmount = exchangeRate.rate.convert(type, rateBase); rateAmountView.setAmount(GenericUtils.formatFiatValue(fiatAmount)); rateAmountView.setSymbol(fiatAmount.type.getSymbol()); // final CurrencyTextView walletView = (CurrencyTextView) view.findViewById(R.id.exchange_rate_row_balance); // walletView.setFormat(Constants.LOCAL_FORMAT); // if (blockchainState == null || !blockchainState.replaying) { // walletView.setAmount(exchangeRate.rate.coinToFiat(balance)); // walletView.setStrikeThru(Constants.TEST); // } else { // walletView.setText("n/a"); // walletView.setStrikeThru(false); // } // walletView.setTextColor(getResources().getColor(R.color.fg_less_significant)); } } }