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.cannabiscoin.wallet.ui; import java.math.BigInteger; import javax.annotation.CheckForNull; import com.google.bitcoin.core.CoinDefinition; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import android.app.Activity; import android.bluetooth.BluetoothAdapter; import android.content.Context; import android.content.Intent; import android.database.Cursor; import android.graphics.Bitmap; import android.net.Uri; import android.nfc.NfcManager; import android.os.Build; import android.os.Bundle; import android.support.v4.app.LoaderManager; import android.support.v4.app.LoaderManager.LoaderCallbacks; import android.support.v4.app.ShareCompat.IntentBuilder; import android.support.v4.content.Loader; import android.text.ClipboardManager; import android.text.SpannableStringBuilder; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.CompoundButton.OnCheckedChangeListener; import android.widget.ImageView; import android.widget.TextView; import com.actionbarsherlock.app.SherlockFragment; import com.actionbarsherlock.view.Menu; import com.actionbarsherlock.view.MenuInflater; import com.actionbarsherlock.view.MenuItem; import com.actionbarsherlock.widget.ShareActionProvider; import com.google.bitcoin.core.Address; import com.google.bitcoin.core.Wallet; import com.google.bitcoin.uri.BitcoinURI; import com.cannabiscoin.wallet.Configuration; import com.cannabiscoin.wallet.Constants; import com.cannabiscoin.wallet.ExchangeRatesProvider; import com.cannabiscoin.wallet.ExchangeRatesProvider.ExchangeRate; import com.cannabiscoin.wallet.WalletApplication; import com.cannabiscoin.wallet.offline.AcceptBluetoothService; import com.cannabiscoin.wallet.util.BitmapFragment; import com.cannabiscoin.wallet.util.Bluetooth; import com.cannabiscoin.wallet.util.Nfc; import com.cannabiscoin.wallet.util.PaymentProtocol; import com.cannabiscoin.wallet.util.Qr; import com.cannabiscoin.wallet.R; /** * @author Andreas Schildbach */ public final class RequestCoinsFragment extends SherlockFragment { private AbstractBindServiceActivity activity; private WalletApplication application; private Configuration config; private Wallet wallet; private NfcManager nfcManager; private LoaderManager loaderManager; private ClipboardManager clipboardManager; private ShareActionProvider shareActionProvider; @CheckForNull private BluetoothAdapter bluetoothAdapter; private ImageView qrView; private Bitmap qrCodeBitmap; private CheckBox acceptBluetoothPaymentView; private TextView initiateRequestView; @CheckForNull private String bluetoothMac; @CheckForNull private Intent bluetoothServiceIntent; private static final int REQUEST_CODE_ENABLE_BLUETOOTH = 0; private CurrencyCalculatorLink amountCalculatorLink; private static final int ID_RATE_LOADER = 0; private static boolean ENABLE_BLUETOOTH_LISTENING = Build.VERSION.SDK_INT >= Constants.SDK_JELLY_BEAN_MR2; private static final Logger log = LoggerFactory.getLogger(RequestCoinsFragment.class); private final LoaderCallbacks<Cursor> rateLoaderCallbacks = new LoaderManager.LoaderCallbacks<Cursor>() { @Override public Loader<Cursor> onCreateLoader(final int id, final Bundle args) { return new ExchangeRateLoader(activity, config); } @Override public void onLoadFinished(final Loader<Cursor> loader, final Cursor data) { if (data != null && data.getCount() > 0) { data.moveToFirst(); final ExchangeRate exchangeRate = ExchangeRatesProvider.getExchangeRate(data); amountCalculatorLink.setExchangeRate(exchangeRate); updateView(); } } @Override public void onLoaderReset(final Loader<Cursor> loader) { } }; @Override public void onAttach(final Activity activity) { super.onAttach(activity); this.activity = (AbstractBindServiceActivity) activity; this.application = (WalletApplication) activity.getApplication(); this.config = application.getConfiguration(); this.wallet = application.getWallet(); this.loaderManager = getLoaderManager(); this.nfcManager = (NfcManager) activity.getSystemService(Context.NFC_SERVICE); this.clipboardManager = (ClipboardManager) activity.getSystemService(Context.CLIPBOARD_SERVICE); this.bluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); } @Override public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) { final View view = inflater.inflate(R.layout.request_coins_fragment, container, false); qrView = (ImageView) view.findViewById(R.id.request_coins_qr); qrView.setOnClickListener(new OnClickListener() { @Override public void onClick(final View v) { BitmapFragment.show(getFragmentManager(), qrCodeBitmap); } }); final CurrencyAmountView btcAmountView = (CurrencyAmountView) view .findViewById(R.id.request_coins_amount_btc); btcAmountView.setCurrencySymbol(config.getBtcPrefix()); btcAmountView.setInputPrecision(config.getBtcMaxPrecision()); btcAmountView.setHintPrecision(config.getBtcPrecision()); btcAmountView.setShift(config.getBtcShift()); final CurrencyAmountView localAmountView = (CurrencyAmountView) view .findViewById(R.id.request_coins_amount_local); localAmountView.setInputPrecision(Constants.LOCAL_PRECISION); localAmountView.setHintPrecision(Constants.LOCAL_PRECISION); amountCalculatorLink = new CurrencyCalculatorLink(btcAmountView, localAmountView); acceptBluetoothPaymentView = (CheckBox) view.findViewById(R.id.request_coins_accept_bluetooth_payment); acceptBluetoothPaymentView .setVisibility(ENABLE_BLUETOOTH_LISTENING && bluetoothAdapter != null ? View.VISIBLE : View.GONE); acceptBluetoothPaymentView .setChecked(ENABLE_BLUETOOTH_LISTENING && bluetoothAdapter != null && bluetoothAdapter.isEnabled()); acceptBluetoothPaymentView.setOnCheckedChangeListener(new OnCheckedChangeListener() { @Override public void onCheckedChanged(final CompoundButton buttonView, final boolean isChecked) { if (ENABLE_BLUETOOTH_LISTENING && bluetoothAdapter != null && isChecked) { if (bluetoothAdapter.isEnabled()) { startBluetoothListening(); } else { // ask for permission to enable bluetooth startActivityForResult(new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE), REQUEST_CODE_ENABLE_BLUETOOTH); } } else { stopBluetoothListening(); } updateView(); } }); initiateRequestView = (TextView) view.findViewById(R.id.request_coins_fragment_initiate_request); return view; } @Override public void onViewCreated(final View view, final Bundle savedInstanceState) { super.onViewCreated(view, savedInstanceState); // don't call in onCreate() because ActionBarSherlock invokes onCreateOptionsMenu() too early setHasOptionsMenu(true); amountCalculatorLink.setExchangeDirection(config.getLastExchangeDirection()); amountCalculatorLink.requestFocus(); } @Override public void onResume() { super.onResume(); amountCalculatorLink.setListener(new CurrencyAmountView.Listener() { @Override public void changed() { updateView(); updateShareIntent(); } @Override public void focusChanged(final boolean hasFocus) { } }); loaderManager.initLoader(ID_RATE_LOADER, null, rateLoaderCallbacks); if (ENABLE_BLUETOOTH_LISTENING && bluetoothAdapter != null && bluetoothAdapter.isEnabled() && acceptBluetoothPaymentView.isChecked()) startBluetoothListening(); updateView(); } @Override public void onDestroyView() { super.onDestroyView(); config.setLastExchangeDirection(amountCalculatorLink.getExchangeDirection()); } @Override public void onPause() { loaderManager.destroyLoader(ID_RATE_LOADER); Nfc.unpublish(nfcManager, activity); amountCalculatorLink.setListener(null); super.onPause(); } @Override public void onActivityResult(final int requestCode, final int resultCode, final Intent data) { if (requestCode == REQUEST_CODE_ENABLE_BLUETOOTH) { acceptBluetoothPaymentView.setChecked(resultCode == Activity.RESULT_OK); if (resultCode == Activity.RESULT_OK && bluetoothAdapter != null) startBluetoothListening(); if (isResumed()) updateView(); } } private void startBluetoothListening() { bluetoothMac = Bluetooth.compressMac(bluetoothAdapter.getAddress()); bluetoothServiceIntent = new Intent(activity, AcceptBluetoothService.class); activity.startService(bluetoothServiceIntent); } private void stopBluetoothListening() { if (bluetoothServiceIntent != null) { activity.stopService(bluetoothServiceIntent); bluetoothServiceIntent = null; } bluetoothMac = null; } @Override public void onCreateOptionsMenu(final Menu menu, final MenuInflater inflater) { inflater.inflate(R.menu.request_coins_fragment_options, menu); final MenuItem shareItem = menu.findItem(R.id.request_coins_options_share); shareActionProvider = (ShareActionProvider) shareItem.getActionProvider(); updateShareIntent(); super.onCreateOptionsMenu(menu, inflater); } @Override public boolean onOptionsItemSelected(final MenuItem item) { switch (item.getItemId()) { case R.id.request_coins_options_copy: handleCopy(); return true; case R.id.request_coins_options_local_app: handleLocalApp(); return true; } return super.onOptionsItemSelected(item); } private void handleCopy() { final String request = determineBitcoinRequestStr(false); clipboardManager.setText(request); activity.toast(R.string.request_coins_clipboard_msg); } private void handleLocalApp() { final Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(determineBitcoinRequestStr(false))); startActivity(intent); activity.finish(); } private void updateView() { if (!isResumed()) return; final String bitcoinRequest = determineBitcoinRequestStr(true); final byte[] paymentRequest = determinePaymentRequest(true); // update qr-code final int size = (int) (256 * getResources().getDisplayMetrics().density); final String qrContent; if (config.getQrPaymentRequestEnabled()) qrContent = CoinDefinition.coinURIScheme.toUpperCase() + ":-" + Qr.encodeBinary(paymentRequest); else qrContent = bitcoinRequest; qrCodeBitmap = Qr.bitmap(qrContent, size); qrView.setImageBitmap(qrCodeBitmap); // update nfc ndef message final boolean nfcSuccess = Nfc.publishMimeObject(nfcManager, activity, PaymentProtocol.MIMETYPE_PAYMENTREQUEST, paymentRequest, false); // update initiate request message final SpannableStringBuilder initiateText = new SpannableStringBuilder( getString(R.string.request_coins_fragment_initiate_request_qr)); if (nfcSuccess) initiateText.append(' ').append(getString(R.string.request_coins_fragment_initiate_request_nfc)); initiateRequestView.setText(initiateText); // focus linking final int activeAmountViewId = amountCalculatorLink.activeTextView().getId(); acceptBluetoothPaymentView.setNextFocusUpId(activeAmountViewId); } private void updateShareIntent() { // update share intent final IntentBuilder builder = IntentBuilder.from(activity); builder.setText(determineBitcoinRequestStr(false)); builder.setType("text/plain"); builder.setChooserTitle(R.string.request_coins_share_dialog_title); shareActionProvider.setShareIntent(builder.getIntent()); } private String determineBitcoinRequestStr(final boolean includeBluetoothMac) { final Address address = application.determineSelectedAddress(); final BigInteger amount = amountCalculatorLink.getAmount(); final StringBuilder uri = new StringBuilder(BitcoinURI.convertToBitcoinURI(address, amount, null, null)); if (includeBluetoothMac && bluetoothMac != null) { uri.append(amount == null ? '?' : '&'); uri.append(Bluetooth.MAC_URI_PARAM).append('=').append(bluetoothMac); } return uri.toString(); } private byte[] determinePaymentRequest(final boolean includeBluetoothMac) { final Address address = application.determineSelectedAddress(); final BigInteger amount = amountCalculatorLink.getAmount(); return PaymentProtocol.createPaymentRequest(amount, address, null, includeBluetoothMac && bluetoothMac != null ? "bt:" + bluetoothMac : null).toByteArray(); } }