Android Open Source - bitfynd-wallet-android Wallet Address Fragment

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License

The source code is released under:
GNU General Public License
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Java Source Code

/*
 * Copyright 2011-2014 the original author or authors.
 *//from   w w w .j a va  2s .c o  m
 * 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.util.concurrent.RejectedExecutionException;
import java.util.concurrent.atomic.AtomicReference;

import javax.annotation.CheckForNull;
import javax.annotation.Nonnull;

import org.bitcoinj.core.Address;
import org.bitcoinj.core.Wallet;
import org.bitcoinj.uri.BitcoinURI;
import org.bitcoinj.utils.Threading;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import android.app.Activity;
import android.app.Fragment;
import android.app.LoaderManager;
import android.app.LoaderManager.LoaderCallbacks;
import android.content.AsyncTaskLoader;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.Loader;
import android.graphics.Bitmap;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.nfc.NfcEvent;
import android.nfc.NfcManager;
import android.os.Bundle;
import android.support.v4.content.LocalBroadcastManager;
import android.text.Spanned;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ImageView;
import de.schildbach.wallet.Constants;
import de.schildbach.wallet.WalletApplication;
import de.schildbach.wallet.util.BitmapFragment;
import de.schildbach.wallet.util.Qr;
import de.schildbach.wallet.util.ThrottlingWalletChangeListener;
import de.schildbach.wallet.util.WalletUtils;
import de.schildbach.wallet.R;

/**
 * @author Andreas Schildbach
 */
public final class WalletAddressFragment extends Fragment implements NfcAdapter.CreateNdefMessageCallback
{
  private Activity activity;
  private WalletApplication application;
  private Wallet wallet;
  private LoaderManager loaderManager;
  @CheckForNull
  private NfcAdapter nfcAdapter;

  private ImageView currentAddressQrView;

  private Bitmap currentAddressQrBitmap;
  private Spanned currentAddressQrLabel;
  private AtomicReference<String> currentAddressUriRef = new AtomicReference<String>();

  private static final int ID_ADDRESS_LOADER = 0;

  @Override
  public void onAttach(final Activity activity)
  {
    super.onAttach(activity);

    this.activity = activity;
    this.application = (WalletApplication) activity.getApplication();
    this.wallet = application.getWallet();
    this.loaderManager = getLoaderManager();
    final NfcManager nfcManager = (NfcManager) activity.getSystemService(Context.NFC_SERVICE);
    this.nfcAdapter = nfcManager.getDefaultAdapter();
  }

  @Override
  public void onCreate(final Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);

    if (nfcAdapter != null && nfcAdapter.isEnabled())
      nfcAdapter.setNdefPushMessageCallback(this, activity);
  }

  @Override
  public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState)
  {
    final View view = inflater.inflate(R.layout.wallet_address_fragment, container, false);
    currentAddressQrView = (ImageView) view.findViewById(R.id.bitcoin_address_qr);

    currentAddressQrView.setOnClickListener(new OnClickListener()
    {
      @Override
      public void onClick(final View v)
      {
        handleShowQRCode();
      }
    });

    return view;
  }

  @Override
  public void onResume()
  {
    super.onResume();

    loaderManager.initLoader(ID_ADDRESS_LOADER, null, addressLoaderCallbacks);

    updateView();
  }

  @Override
  public void onPause()
  {
    loaderManager.destroyLoader(ID_ADDRESS_LOADER);

    super.onPause();
  }

  private void updateView()
  {
    currentAddressQrView.setImageBitmap(currentAddressQrBitmap);
  }

  private void handleShowQRCode()
  {
    BitmapFragment.show(getFragmentManager(), currentAddressQrBitmap, currentAddressQrLabel);
  }

  public static class CurrentAddressLoader extends AsyncTaskLoader<Address>
  {
    private LocalBroadcastManager broadcastManager;
    private final Wallet wallet;

    private static final Logger log = LoggerFactory.getLogger(WalletBalanceLoader.class);

    public CurrentAddressLoader(final Context context, @Nonnull final Wallet wallet)
    {
      super(context);

      this.broadcastManager = LocalBroadcastManager.getInstance(context.getApplicationContext());
      this.wallet = wallet;
    }

    @Override
    protected void onStartLoading()
    {
      super.onStartLoading();

      wallet.addEventListener(walletChangeListener, Threading.SAME_THREAD);
      broadcastManager.registerReceiver(walletChangeReceiver, new IntentFilter(WalletApplication.ACTION_WALLET_CHANGED));

      safeForceLoad();
    }

    @Override
    protected void onStopLoading()
    {
      broadcastManager.unregisterReceiver(walletChangeReceiver);
      wallet.removeEventListener(walletChangeListener);
      walletChangeListener.removeCallbacks();

      super.onStopLoading();
    }

    @Override
    protected void onReset()
    {
      broadcastManager.unregisterReceiver(walletChangeReceiver);
      wallet.removeEventListener(walletChangeListener);
      walletChangeListener.removeCallbacks();

      super.onReset();
    }

    @Override
    public Address loadInBackground()
    {
      return wallet.currentReceiveAddress();
    }

    private final ThrottlingWalletChangeListener walletChangeListener = new ThrottlingWalletChangeListener()
    {
      @Override
      public void onThrottledWalletChanged()
      {
        safeForceLoad();
      }
    };

    private final BroadcastReceiver walletChangeReceiver = new BroadcastReceiver()
    {
      @Override
      public void onReceive(final Context context, final Intent intent)
      {
        safeForceLoad();
      }
    };

    private void safeForceLoad()
    {
      try
      {
        forceLoad();
      }
      catch (final RejectedExecutionException x)
      {
        log.info("rejected execution: " + CurrentAddressLoader.this.toString());
      }
    }
  }

  private final LoaderCallbacks<Address> addressLoaderCallbacks = new LoaderManager.LoaderCallbacks<Address>()
  {
    private Address lastAddress;

    @Override
    public Loader<Address> onCreateLoader(final int id, final Bundle args)
    {
      return new CurrentAddressLoader(activity, wallet);
    }

    @Override
    public void onLoadFinished(final Loader<Address> loader, final Address currentAddress)
    {
      if (!currentAddress.equals(lastAddress))
      {
        lastAddress = currentAddress;

        final String addressStr = BitcoinURI.convertToBitcoinURI(currentAddress, null, null, null);

                final int size = getResources().getDimensionPixelSize(R.dimen.bitmap_dialog_qr_size);
        currentAddressQrBitmap = Qr.bitmap(addressStr, size);
        currentAddressQrLabel = WalletUtils.formatAddress(currentAddress, Constants.ADDRESS_FORMAT_GROUP_SIZE,
            Constants.ADDRESS_FORMAT_LINE_SIZE);

        currentAddressUriRef.set(addressStr);

        updateView();
      }
    }

    @Override
    public void onLoaderReset(final Loader<Address> loader)
    {
    }
  };

  @Override
  public NdefMessage createNdefMessage(final NfcEvent event)
  {
    final String uri = currentAddressUriRef.get();
    if (uri != null)
      return new NdefMessage(new NdefRecord[] { NdefRecord.createUri(uri) });
    else
      return null;
  }
}
Java Source Code List
