Java tutorial
/* * 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/>. */ package com.kncwallet.wallet.ui; import android.app.Activity; import android.content.*; import android.content.SharedPreferences.OnSharedPreferenceChangeListener; import android.database.Cursor; import android.nfc.NfcManager; import android.os.Bundle; import android.preference.PreferenceManager; import android.support.v4.app.LoaderManager; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.content.Loader; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.text.Html; import android.text.SpannableStringBuilder; 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.LinearLayout; import android.widget.TextView; import com.actionbarsherlock.view.Menu; import com.actionbarsherlock.view.MenuInflater; import com.actionbarsherlock.view.MenuItem; import com.google.bitcoin.core.Address; import com.google.bitcoin.core.Wallet; import com.google.bitcoin.uri.BitcoinURI; import com.kncwallet.wallet.Constants; import com.kncwallet.wallet.ExchangeRatesProvider; import com.kncwallet.wallet.ExchangeRatesProvider.ExchangeRate; import com.kncwallet.wallet.R; import com.kncwallet.wallet.WalletApplication; import com.kncwallet.wallet.service.BlockchainService; import com.kncwallet.wallet.ui.util.AnimationUtil; import com.kncwallet.wallet.ui.view.KnCFragment; import com.kncwallet.wallet.ui.view.TransactionsListView; import com.kncwallet.wallet.ui.view.TransactionsListView.Direction; import com.kncwallet.wallet.util.DenominationUtil; import com.kncwallet.wallet.util.Nfc; import com.kncwallet.wallet.util.ViewPagerTabs; import com.kncwallet.wallet.util.WalletUtils; import javax.annotation.CheckForNull; import java.math.BigInteger; import java.util.Date; /** * @author Andreas Schildbach */ public final class HomeFragment extends KnCFragment { private WalletApplication application; private AbstractWalletActivity activity; private Wallet wallet; private SharedPreferences prefs; private LoaderManager loaderManager; //used to republish when address changes private NfcManager nfcManager; private TextView bitcoinAddressLabel; private Address lastSelectedAddress; private View viewBalance; private CurrencyTextView viewBalanceBtc; private CurrencyTextView viewBalanceLocal; private TextView viewProgress; private static final int REQUEST_ADDRESS = 10; @CheckForNull private BigInteger balance = null; @CheckForNull private ExchangeRate exchangeRate = null; private int download; @CheckForNull private Date bestChainDate = null; private boolean replaying = false; private static final int ID_BALANCE_LOADER = 0; private static final int ID_RATE_LOADER = 1; private LinearLayout bottomLayout; private TransactionsListViewPagerAdapter transactionsListViewPagerAdapter; private boolean showInBtc = true; @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(); this.nfcManager = (NfcManager) activity.getSystemService(Context.NFC_SERVICE); } @Override public void onCreateOptionsMenu(final Menu menu, final MenuInflater inflater) { inflater.inflate(R.menu.home_fragment_options, menu); super.onCreateOptionsMenu(menu, inflater); } @Override public boolean onOptionsItemSelected(final MenuItem item) { switch (item.getItemId()) { case R.id.home_fragment_options_address_book: startActivityForResult(new Intent(activity, AddressBookActivity.class), REQUEST_ADDRESS); return true; } return true; } @Override public void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); setHasOptionsMenu(true); //TODO: make sure this doesnt break anything! setRetainInstance(true); } @Override public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) { setHasOptionsMenu(true); return inflater.inflate(R.layout.home_fragment, container, false); } public void switchBalance() { if (exchangeRate == null) { viewBalanceBtc.setVisibility(View.VISIBLE); viewBalanceLocal.setVisibility(View.GONE); return; } AnimationUtil.toggleViews(viewBalanceBtc, viewBalanceLocal); showInBtc = !showInBtc; toggleCurrencyInTransactionList(true); } private void toggleCurrencyInTransactionList(boolean animate) { transactionsListViewPagerAdapter.notifyCurrencyChange(animate); } @Override public void onViewCreated(final View view, final Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); viewBalance = view.findViewById(R.id.wallet_balance); viewBalance.setEnabled(false); viewBalanceBtc = (CurrencyTextView) view.findViewById(R.id.wallet_balance_btc); viewBalanceLocal = (CurrencyTextView) view.findViewById(R.id.wallet_balance_local); viewBalanceLocal.setPrecision(Constants.LOCAL_PRECISION, 0); viewBalanceLocal.setStrikeThru(Constants.TEST); viewBalanceBtc.setOnClickListener(new OnClickListener() { @Override public void onClick(final View v) { HomeFragment.this.switchBalance(); } }); viewBalanceLocal.setOnClickListener(new OnClickListener() { @Override public void onClick(final View v) { HomeFragment.this.switchBalance(); } }); viewProgress = (TextView) view.findViewById(R.id.wallet_balance_progress); TextView header = ((TextView) view.findViewById(R.id.header_text)); bitcoinAddressLabel = (TextView) view.findViewById(R.id.bitcoin_address_label); header.setText(R.string.home_heading); //transaction list stuff final ViewPagerTabs pagerTabs = (ViewPagerTabs) view.findViewById(R.id.transactions_pager_tabs); pagerTabs.addTabLabels(R.string.wallet_transactions_fragment_tab_sent, R.string.wallet_transactions_fragment_tab_all, R.string.wallet_transactions_fragment_tab_received); final ViewPager subViewPager = (ViewPager) view.findViewById(R.id.transactions_pager); transactionsListViewPagerAdapter = new TransactionsListViewPagerAdapter(activity); subViewPager.setAdapter(transactionsListViewPagerAdapter); subViewPager.setOnPageChangeListener(pagerTabs); subViewPager.setPageMargin(0); subViewPager.setCurrentItem(1); subViewPager.setPageMarginDrawable(R.color.knc_background_darker); subViewPager.setOffscreenPageLimit(3); pagerTabs.forceRedrawAtPosition(1); bottomLayout = (LinearLayout) view.findViewById(R.id.home_bottom); bottomLayout.setOnClickListener(new OnClickListener() { @Override public void onClick(View view) { ((WalletActivity) activity).handleExportKeys(); } }); final SpannableStringBuilder text = new SpannableStringBuilder(); text.append(Html.fromHtml(getString(R.string.wallet_disclaimer_fragment_remind_backup))); text.append("\n"); text.append(Html.fromHtml(getString(R.string.wallet_disclaimer_fragment_remind_safety))); TextView bottomBackupinfo = (TextView) bottomLayout.findViewById(R.id.home_bottom_backup_info); bottomBackupinfo.setText(text); } @Override public void onResume() { super.onResume(); LoaderManager lm = getLoaderManager(); lm.initLoader(ID_BALANCE_LOADER, null, balanceLoaderCallbacks); lm.initLoader(ID_RATE_LOADER, null, rateLoaderCallbacks); if (broadcastReceiverIntent == null) { broadcastReceiverIntent = activity.registerReceiver(broadcastReceiver, new IntentFilter(BlockchainService.ACTION_BLOCKCHAIN_STATE)); } activity.registerReceiver(broadcastReceiver, new IntentFilter(BlockchainService.ACTION_BLOCKCHAIN_STATE)); prefs.registerOnSharedPreferenceChangeListener(prefsListener); updateBalanceView(); updateAddressView(); updateBackupView(); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); } @Override public void onPause() { loaderManager.destroyLoader(ID_RATE_LOADER); loaderManager.destroyLoader(ID_BALANCE_LOADER); prefs.unregisterOnSharedPreferenceChangeListener(prefsListener); Nfc.unpublish(nfcManager, getActivity()); if (broadcastReceiverIntent != null) { activity.unregisterReceiver(broadcastReceiver); broadcastReceiverIntent = null; } super.onPause(); } private void updateBalanceView() { if (!isAdded()) return; final boolean showProgress; if (bestChainDate != null) { final long blockchainLag = System.currentTimeMillis() - bestChainDate.getTime(); final boolean blockchainUptodate = blockchainLag < Constants.BLOCKCHAIN_UPTODATE_THRESHOLD_MS; final boolean downloadOk = download == BlockchainService.ACTION_BLOCKCHAIN_STATE_DOWNLOAD_OK; showProgress = !(blockchainUptodate || !replaying); final String downloading = getString(downloadOk ? R.string.blockchain_state_progress_downloading : R.string.blockchain_state_progress_stalled); 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)); } 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)); } 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)); } else { final long months = blockchainLag / (30 * DateUtils.DAY_IN_MILLIS); viewProgress.setText(getString(R.string.blockchain_state_progress_months, downloading, months)); } } else { showProgress = false; } if (!showProgress) { viewBalance.setVisibility(View.VISIBLE); if (balance != null) { final String precision = prefs.getString(Constants.PREFS_KEY_BTC_PRECISION, Constants.PREFS_DEFAULT_BTC_PRECISION); final int btcPrecision = precision.charAt(0) - '0'; final int btcShift = precision.length() == 3 ? precision.charAt(2) - '0' : 0; final String prefix = DenominationUtil.getCurrencyCode(btcShift); if (viewBalanceLocal.getVisibility() != View.VISIBLE) { viewBalanceBtc.setVisibility(View.VISIBLE); } viewBalanceBtc.setPrecision(btcPrecision, btcShift); viewBalanceBtc.setSuffix(prefix); viewBalanceBtc.setAmount(balance); } else { viewBalanceBtc.setVisibility(View.INVISIBLE); } viewProgress.setVisibility(View.GONE); } else { viewProgress.setVisibility(View.VISIBLE); viewBalance.setVisibility(View.INVISIBLE); } if (exchangeRate != null && exchangeRate.rate != null && balance != null) { final BigInteger localValue = WalletUtils.localValue(balance, exchangeRate.rate); viewBalanceLocal.setSuffix(exchangeRate.currencyCode); viewBalanceLocal.setAmount(localValue); viewBalanceLocal.setTextColor(getResources().getColor(R.color.knc_highlight)); } } private void updateAddressView() { final Address selectedAddress = application.determineSelectedAddress(); if (!selectedAddress.equals(lastSelectedAddress)) { lastSelectedAddress = selectedAddress; bitcoinAddressLabel.setText(WalletUtils.formatAddress(selectedAddress, 34, 34)); final String addressStr = BitcoinURI.convertToBitcoinURI(selectedAddress, null, null, null); Nfc.publishUri(nfcManager, getActivity(), addressStr); } } private void updateBackupView() { boolean show = prefs.getBoolean(Constants.PREFS_KEY_REMIND_BACKUP, true); if (show) { bottomLayout.setVisibility(View.VISIBLE); } else { bottomLayout.setVisibility(View.GONE); } } private Intent broadcastReceiverIntent = null; 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); replaying = intent.getBooleanExtra(BlockchainService.ACTION_BLOCKCHAIN_STATE_REPLAYING, false); updateBalanceView(); } } private final LoaderCallbacks<BigInteger> balanceLoaderCallbacks = new LoaderManager.LoaderCallbacks<BigInteger>() { @Override public Loader<BigInteger> onCreateLoader(final int id, final Bundle args) { return new WalletBalanceLoader(activity, wallet); } @Override public void onLoadFinished(final Loader<BigInteger> loader, final BigInteger balance) { HomeFragment.this.balance = balance; updateBalanceView(); } @Override public void onLoaderReset(final Loader<BigInteger> loader) { } }; private final LoaderCallbacks<Cursor> rateLoaderCallbacks = new LoaderManager.LoaderCallbacks<Cursor>() { @Override public Loader<Cursor> onCreateLoader(final int id, final Bundle args) { return new ExchangeRateLoader(activity); } @Override public void onLoadFinished(final Loader<Cursor> loader, final Cursor data) { if (data != null) { data.moveToFirst(); exchangeRate = ExchangeRatesProvider.getExchangeRate(data); toggleCurrencyInTransactionList(false); updateBalanceView(); } } @Override public void onLoaderReset(final Loader<Cursor> loader) { } }; private final OnSharedPreferenceChangeListener prefsListener = new OnSharedPreferenceChangeListener() { @Override public void onSharedPreferenceChanged(final SharedPreferences sharedPreferences, final String key) { if (Constants.PREFS_KEY_SELECTED_ADDRESS.equals(key)) updateAddressView(); } }; private class TransactionsListViewPagerAdapter extends PagerAdapter { private final Activity activity; private boolean animatedUpdates = true; public TransactionsListViewPagerAdapter(Activity activity) { this.activity = activity; } @Override public int getCount() { return 3; } @Override public Object instantiateItem(android.view.ViewGroup container, int position) { TransactionsListView.Direction direction = getDirection(position); TransactionsListView transactionsListView = new TransactionsListView(activity, direction, getLoaderManager(), getFragmentManager(), position); container.addView(transactionsListView); return transactionsListView; } @Override public void destroyItem(ViewGroup collection, int position, Object view) { ((TransactionsListView) view).destroy(); collection.removeView((View) view); } @Override public int getItemPosition(Object object) { if (object instanceof TransactionsListView) { ((TransactionsListView) object).updateUseBtc(showInBtc, exchangeRate, animatedUpdates); } return super.getItemPosition(object); } @Override public boolean isViewFromObject(View view, Object object) { return view == object; } public void notifyCurrencyChange(boolean animate) { this.animatedUpdates = animate; super.notifyDataSetChanged(); } } private static Direction getDirection(int position) { final Direction direction; if (position == 0) direction = Direction.SENT; else if (position == 1) direction = null; else if (position == 2) direction = Direction.RECEIVED; else throw new IllegalStateException(); return direction; } @Override public void isShowing() { } }