Java tutorial
/* * Copyright 2011-2013 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 de.schildbach.wallet.ui; import java.math.BigInteger; import java.util.Date; import android.app.Activity; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.SharedPreferences; import android.database.Cursor; import android.os.Bundle; import android.os.Handler; import android.preference.PreferenceManager; import android.support.v4.app.Fragment; import android.support.v4.app.LoaderManager; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.Loader; import android.text.format.DateUtils; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.FrameLayout; import android.widget.TextView; import com.google.bitcoin.core.Wallet; import de.schildbach.wallet.Constants; import de.schildbach.wallet.ExchangeRatesProvider; import de.schildbach.wallet.ExchangeRatesProvider.ExchangeRate; import de.schildbach.wallet.WalletApplication; import de.schildbach.wallet.service.BlockchainService; import de.schildbach.wallet.util.WalletUtils; import de.schildbach.wallet_test.R; /** * @author Andreas Schildbach */ public final class WalletBalanceFragment extends Fragment { private WalletApplication application; private AbstractWalletActivity activity; private Wallet wallet; private SharedPreferences prefs; private LoaderManager loaderManager; private View viewBalance; private CurrencyTextView viewBalanceBtc; private FrameLayout viewBalanceLocalFrame; private CurrencyTextView viewBalanceLocal; private TextView viewProgress; private boolean showLocalBalance; private BigInteger balance = null; private ExchangeRate exchangeRate = null; private int download; private Date bestChainDate; private final Handler delayMessageHandler = new Handler(); private static final int ID_BALANCE_LOADER = 0; private static final int ID_RATE_LOADER = 1; @Override public void onAttach(final Activity activity) { super.onAttach(activity); this.activity = (AbstractWalletActivity) activity; this.application = (WalletApplication) activity.getApplication(); this.wallet = application.getWallet(); this.prefs = PreferenceManager.getDefaultSharedPreferences(activity); this.loaderManager = getLoaderManager(); showLocalBalance = getResources().getBoolean(R.bool.show_local_balance); } @Override public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) { return inflater.inflate(R.layout.wallet_balance_fragment, container, false); } @Override public void onViewCreated(final View view, final Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); final boolean showExchangeRatesOption = getResources().getBoolean(R.bool.show_exchange_rates_option); viewBalance = view.findViewById(R.id.wallet_balance); if (showExchangeRatesOption) { viewBalance.setOnClickListener(new OnClickListener() { public void onClick(final View v) { startActivity(new Intent(getActivity(), ExchangeRatesActivity.class)); } }); } else { viewBalance.setEnabled(false); } viewBalanceBtc = (CurrencyTextView) view.findViewById(R.id.wallet_balance_btc); viewBalanceBtc.setPrefix(Constants.CURRENCY_CODE_BITCOIN); viewBalanceLocalFrame = (FrameLayout) view.findViewById(R.id.wallet_balance_local_frame); if (showExchangeRatesOption) viewBalanceLocalFrame.setForeground(getResources().getDrawable(R.drawable.dropdown_ic_arrow_small)); viewBalanceLocal = (CurrencyTextView) view.findViewById(R.id.wallet_balance_local); viewBalanceLocal.setPrecision(Constants.LOCAL_PRECISION); viewBalanceLocal.setInsignificantRelativeSize(1); viewBalanceLocal.setStrikeThru(Constants.TEST); viewProgress = (TextView) view.findViewById(R.id.wallet_balance_progress); } @Override public void onResume() { super.onResume(); activity.registerReceiver(broadcastReceiver, new IntentFilter(BlockchainService.ACTION_BLOCKCHAIN_STATE)); loaderManager.initLoader(ID_BALANCE_LOADER, null, balanceLoaderCallbacks); loaderManager.initLoader(ID_RATE_LOADER, null, rateLoaderCallbacks); updateView(); } @Override public void onPause() { loaderManager.destroyLoader(ID_RATE_LOADER); loaderManager.destroyLoader(ID_BALANCE_LOADER); activity.unregisterReceiver(broadcastReceiver); super.onPause(); } @Override public void onDestroy() { delayMessageHandler.removeCallbacksAndMessages(null); super.onDestroy(); } private void updateView() { final boolean showProgress; if (download != BlockchainService.ACTION_BLOCKCHAIN_STATE_DOWNLOAD_OK) { showProgress = true; if ((download & BlockchainService.ACTION_BLOCKCHAIN_STATE_DOWNLOAD_STORAGE_PROBLEM) != 0) viewProgress.setText(R.string.blockchain_state_progress_problem_storage); else if ((download & BlockchainService.ACTION_BLOCKCHAIN_STATE_DOWNLOAD_NETWORK_PROBLEM) != 0) viewProgress.setText(R.string.blockchain_state_progress_problem_network); } else if (bestChainDate != null) { final long blockchainLag = System.currentTimeMillis() - bestChainDate.getTime(); final boolean blockchainUptodate = blockchainLag < Constants.BLOCKCHAIN_UPTODATE_THRESHOLD_MS; showProgress = !blockchainUptodate; final String downloading = getString(R.string.blockchain_state_progress_downloading); final String stalled = getString(R.string.blockchain_state_progress_stalled); final String stalledText; if (blockchainLag < 2 * DateUtils.DAY_IN_MILLIS) { final long hours = blockchainLag / DateUtils.HOUR_IN_MILLIS; viewProgress.setText(getString(R.string.blockchain_state_progress_hours, downloading, hours)); stalledText = getString(R.string.blockchain_state_progress_hours, stalled, hours); } else if (blockchainLag < 2 * DateUtils.WEEK_IN_MILLIS) { final long days = blockchainLag / DateUtils.DAY_IN_MILLIS; viewProgress.setText(getString(R.string.blockchain_state_progress_days, downloading, days)); stalledText = getString(R.string.blockchain_state_progress_days, stalled, days); } else if (blockchainLag < 90 * DateUtils.DAY_IN_MILLIS) { final long weeks = blockchainLag / DateUtils.WEEK_IN_MILLIS; viewProgress.setText(getString(R.string.blockchain_state_progress_weeks, downloading, weeks)); stalledText = getString(R.string.blockchain_state_progress_weeks, stalled, weeks); } else { final long months = blockchainLag / (30 * DateUtils.DAY_IN_MILLIS); viewProgress.setText(getString(R.string.blockchain_state_progress_months, downloading, months)); stalledText = getString(R.string.blockchain_state_progress_months, stalled, months); } delayMessageHandler.removeCallbacksAndMessages(null); delayMessageHandler.postDelayed(new Runnable() { public void run() { viewProgress.setText(stalledText); } }, Constants.BLOCKCHAIN_DOWNLOAD_THRESHOLD_MS); } else { showProgress = false; } if (!showProgress) { viewBalance.setVisibility(View.VISIBLE); if (!showLocalBalance) viewBalanceLocalFrame.setVisibility(View.GONE); if (balance != null) { viewBalanceBtc.setVisibility(View.VISIBLE); viewBalanceBtc.setPrecision(Integer.parseInt(prefs.getString(Constants.PREFS_KEY_BTC_PRECISION, Integer.toString(Constants.BTC_PRECISION)))); viewBalanceBtc.setAmount(balance); if (showLocalBalance) { if (exchangeRate != null) { final BigInteger localValue = WalletUtils.localValue(balance, exchangeRate.rate); viewBalanceLocalFrame.setVisibility(View.VISIBLE); viewBalanceLocal.setPrefix(Constants.PREFIX_ALMOST_EQUAL_TO + exchangeRate.currencyCode); viewBalanceLocal.setAmount(localValue); viewBalanceLocal.setTextColor(getResources().getColor(R.color.fg_less_significant)); } else { viewBalanceLocalFrame.setVisibility(View.INVISIBLE); } } } else { viewBalanceBtc.setVisibility(View.INVISIBLE); } viewProgress.setVisibility(View.GONE); } else { viewProgress.setVisibility(View.VISIBLE); viewBalance.setVisibility(View.INVISIBLE); } } private final BlockchainBroadcastReceiver broadcastReceiver = new BlockchainBroadcastReceiver(); private final class BlockchainBroadcastReceiver extends BroadcastReceiver { @Override public void onReceive(final Context context, final Intent intent) { download = intent.getIntExtra(BlockchainService.ACTION_BLOCKCHAIN_STATE_DOWNLOAD, BlockchainService.ACTION_BLOCKCHAIN_STATE_DOWNLOAD_OK); bestChainDate = (Date) intent .getSerializableExtra(BlockchainService.ACTION_BLOCKCHAIN_STATE_BEST_CHAIN_DATE); updateView(); } } private final LoaderCallbacks<BigInteger> balanceLoaderCallbacks = new LoaderManager.LoaderCallbacks<BigInteger>() { public Loader<BigInteger> onCreateLoader(final int id, final Bundle args) { return new WalletBalanceLoader(activity, wallet); } public void onLoadFinished(final Loader<BigInteger> loader, final BigInteger balance) { WalletBalanceFragment.this.balance = balance; updateView(); } public void onLoaderReset(final Loader<BigInteger> loader) { } }; private final LoaderCallbacks<Cursor> rateLoaderCallbacks = new LoaderManager.LoaderCallbacks<Cursor>() { public Loader<Cursor> onCreateLoader(final int id, final Bundle args) { return new ExchangeRateLoader(activity); } public void onLoadFinished(final Loader<Cursor> loader, final Cursor data) { if (data != null) { data.moveToFirst(); exchangeRate = ExchangeRatesProvider.getExchangeRate(data); updateView(); } } public void onLoaderReset(final Loader<Cursor> loader) { } }; }