Android Open Source - My-Wallet-Android Exchange Rates Fragment

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Copyright 2011-2012 the original author or authors.
 */*  ww  w . j  a  v a 2s .com*/
 * 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 piuk.blockchain.android.ui;

import java.math.BigDecimal;
import java.math.BigInteger;

import android.content.SharedPreferences;
import android.database.Cursor;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v4.app.ListFragment;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.support.v4.widget.SimpleCursorAdapter;
import android.support.v4.widget.SimpleCursorAdapter.ViewBinder;
import android.view.View;
import android.widget.BaseAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;

import com.google.bitcoin.core.AbstractWalletEventListener;
import com.google.bitcoin.core.Wallet;
import com.google.bitcoin.core.Wallet.BalanceType;
import com.google.bitcoin.core.WalletEventListener;

import piuk.blockchain.R;
import piuk.blockchain.android.Constants;
import piuk.blockchain.android.ExchangeRatesProvider;
import piuk.blockchain.android.WalletApplication;

/**
 * @author Andreas Schildbach
 */
public final class ExchangeRatesFragment extends ListFragment implements LoaderManager.LoaderCallbacks<Cursor>
{
  private WalletApplication application;
  private SharedPreferences prefs;
  private SimpleCursorAdapter adapter;

  private final WalletEventListener walletEventListener = new AbstractWalletEventListener()
  {
    @Override
    public void onChange(Wallet wallet)
    {

      try {
        if (getActivity() == null) {
          return;
        }

        getActivity().runOnUiThread(new Runnable()
        {
          public void run()
          {
            updateView();
          }
        });
      } catch (Exception e) {
        e.printStackTrace();
      }
    }
  };

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

    application = (WalletApplication) getActivity().getApplication();
    final Wallet wallet = application.getWallet();

    wallet.addEventListener(walletEventListener);
  }

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

    prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());

    setEmptyText(getString(R.string.exchange_rates_fragment_empty_text));

    adapter = new SimpleCursorAdapter(getActivity(), R.layout.exchange_rate_row, null, new String[] { ExchangeRatesProvider.KEY_CURRENCY_CODE,
      ExchangeRatesProvider.KEY_EXCHANGE_RATE }, new int[] { R.id.exchange_rate_currency_code, R.id.exchange_rate_value }, 0);
    adapter.setViewBinder(new ViewBinder()
    {
      public boolean setViewValue(final View view, final Cursor cursor, final int columnIndex)
      {
        if (!ExchangeRatesProvider.KEY_EXCHANGE_RATE.equals(cursor.getColumnName(columnIndex)))
          return false;

        final BigInteger value = new BigDecimal(application.getWallet().getBalance(BalanceType.ESTIMATED)).multiply(
            new BigDecimal(cursor.getDouble(columnIndex))).toBigInteger();
        final CurrencyAmountView valueView = (CurrencyAmountView) view;
        valueView.setCurrencyCode(null);
        valueView.setAmount(value);

        return true;
      }
    });
    setListAdapter(adapter);

    getLoaderManager().initLoader(0, null, this);
  }

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

    updateView();
  }

  @Override
  public void onDestroy()
  {
    application.getWallet().removeEventListener(walletEventListener);

    super.onDestroy();
  }

  @Override
  public void onListItemClick(final ListView l, final View v, final int position, final long id)
  {
    final Cursor cursor = (Cursor) adapter.getItem(position);
    final String currencyCode = cursor.getString(cursor.getColumnIndexOrThrow(ExchangeRatesProvider.KEY_CURRENCY_CODE));

    prefs.edit().putString(Constants.PREFS_KEY_EXCHANGE_CURRENCY, currencyCode).commit();

    final WalletBalanceFragment walletBalanceFragment = (WalletBalanceFragment) getFragmentManager().findFragmentById(
        R.id.wallet_balance_fragment);
    if (walletBalanceFragment != null)
    {
      walletBalanceFragment.updateView();
      walletBalanceFragment.flashLocal();
    }
  }

  private void updateView()
  {
    final ListAdapter adapter = getListAdapter();
    if (adapter != null)
      ((BaseAdapter) adapter).notifyDataSetChanged();
  }

  public Loader<Cursor> onCreateLoader(final int id, final Bundle args)
  {
    return new CursorLoader(getActivity(), ExchangeRatesProvider.CONTENT_URI, null, null, null, null);
  }

  public void onLoadFinished(final Loader<Cursor> loader, final Cursor data)
  {
    adapter.swapCursor(data);
  }

  public void onLoaderReset(final Loader<Cursor> loader)
  {
    adapter.swapCursor(null);
  }
}

Java Source Code List

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