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 java.util.ArrayList; import java.util.List; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.view.View; import android.view.ViewGroup; import com.actionbarsherlock.app.ActionBar; import com.actionbarsherlock.view.MenuItem; import com.google.bitcoin.core.Address; import com.google.bitcoin.core.ECKey; import com.kncwallet.wallet.Constants; import com.kncwallet.wallet.R; import com.kncwallet.wallet.util.ViewPagerTabs; /** * @author Andreas Schildbach */ public final class AddressBookActivity extends AbstractWalletActivity { public static void start(final Context context, final boolean sending) { final Intent intent = new Intent(context, AddressBookActivity.class); intent.putExtra(EXTRA_SENDING, sending); context.startActivity(intent); } private static final String EXTRA_SENDING = "sending"; private WalletAddressesFragment walletAddressesFragment; private SendingAddressesFragment sendingAddressesFragment; private static final String TAG_LEFT = "wallet_addresses"; private static final String TAG_RIGHT = "sending_addresses"; @Override protected void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.address_book_content); final ActionBar actionBar = getSupportActionBar(); actionBar.setDisplayHomeAsUpEnabled(true); actionBar.setIcon(R.drawable.ic_knclogo); final FragmentManager fragmentManager = getSupportFragmentManager(); walletAddressesFragment = (WalletAddressesFragment) fragmentManager.findFragmentByTag(TAG_LEFT); sendingAddressesFragment = (SendingAddressesFragment) fragmentManager.findFragmentByTag(TAG_RIGHT); final FragmentTransaction removal = fragmentManager.beginTransaction(); if (walletAddressesFragment == null) walletAddressesFragment = new WalletAddressesFragment(); else removal.remove(walletAddressesFragment); if (sendingAddressesFragment == null) sendingAddressesFragment = new SendingAddressesFragment(); else removal.remove(sendingAddressesFragment); if (!removal.isEmpty()) { removal.commit(); fragmentManager.executePendingTransactions(); } final ViewPager pager = (ViewPager) findViewById(R.id.address_book_pager); if (pager != null) { pager.setAdapter( new TwoFragmentAdapter(fragmentManager, walletAddressesFragment, sendingAddressesFragment)); final ViewPagerTabs pagerTabs = (ViewPagerTabs) findViewById(R.id.address_book_pager_tabs); pagerTabs.addTabLabels(R.string.address_book_list_receiving_title, R.string.address_book_list_sending_title); pager.setOnPageChangeListener(pagerTabs); final int position = getIntent().getBooleanExtra(EXTRA_SENDING, true) ? 1 : 0; pager.setCurrentItem(position); pager.setPageMargin(2); pager.setPageMarginDrawable(R.color.bg_less_bright); pagerTabs.onPageSelected(position); pagerTabs.onPageScrolled(position, 0, 0); } else { fragmentManager.beginTransaction() .add(R.id.wallet_addresses_fragment, walletAddressesFragment, TAG_LEFT) .add(R.id.sending_addresses_fragment, sendingAddressesFragment, TAG_RIGHT).commit(); } updateFragments(); } @Override public boolean onOptionsItemSelected(final MenuItem item) { switch (item.getItemId()) { case android.R.id.home: finish(); return true; } return super.onOptionsItemSelected(item); } /* private */void updateFragments() { final List<ECKey> keys = getWalletApplication().getWallet().getKeys(); final ArrayList<Address> addresses = new ArrayList<Address>(keys.size()); for (final ECKey key : keys) { final Address address = key.toAddress(Constants.NETWORK_PARAMETERS); addresses.add(address); } sendingAddressesFragment.setWalletAddresses(addresses); } private static class TwoFragmentAdapter extends PagerAdapter { private final FragmentManager fragmentManager; private final Fragment left; private final Fragment right; private FragmentTransaction currentTransaction = null; private Fragment currentPrimaryItem = null; public TwoFragmentAdapter(final FragmentManager fragmentManager, final Fragment left, final Fragment right) { this.fragmentManager = fragmentManager; this.left = left; this.right = right; } @Override public int getCount() { return 2; } @Override public Object instantiateItem(final ViewGroup container, final int position) { if (currentTransaction == null) currentTransaction = fragmentManager.beginTransaction(); final String tag = (position == 0) ? TAG_LEFT : TAG_RIGHT; final Fragment fragment = (position == 0) ? left : right; currentTransaction.add(container.getId(), fragment, tag); if (fragment != currentPrimaryItem) { fragment.setMenuVisibility(false); fragment.setUserVisibleHint(false); } return fragment; } @Override public void destroyItem(final ViewGroup container, final int position, final Object object) { throw new UnsupportedOperationException(); } @Override public void setPrimaryItem(final ViewGroup container, final int position, final Object object) { final Fragment fragment = (Fragment) object; if (fragment != currentPrimaryItem) { if (currentPrimaryItem != null) { currentPrimaryItem.setMenuVisibility(false); currentPrimaryItem.setUserVisibleHint(false); } if (fragment != null) { fragment.setMenuVisibility(true); fragment.setUserVisibleHint(true); } currentPrimaryItem = fragment; } } @Override public void finishUpdate(final ViewGroup container) { if (currentTransaction != null) { currentTransaction.commitAllowingStateLoss(); currentTransaction = null; fragmentManager.executePendingTransactions(); } } @Override public boolean isViewFromObject(final View view, final Object object) { return ((Fragment) object).getView() == view; } } }