app/src/main/java/net/ktnx/mobileledger/ui/activity/MainActivity.java

   1 /*
   2  * Copyright © 2019 Damyan Ivanov.
   3  * This file is part of MoLe.
   4  * MoLe is free software: you can distribute it and/or modify it
   5  * under the term of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your opinion), any later version.
   8  *
   9  * MoLe is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License terms for details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with MoLe. If not, see <https://www.gnu.org/licenses/>.
  16  */
  17
  18 package net.ktnx.mobileledger.ui.activity;
  19
  20 import android.content.Intent;
  21 import android.content.pm.PackageInfo;
  22 import android.content.res.ColorStateList;
  23 import android.graphics.Color;
  24 import android.os.AsyncTask;
  25 import android.os.Build;
  26 import android.os.Bundle;
  27 import android.util.Log;
  28 import android.view.View;
  29 import android.view.ViewGroup;
  30 import android.view.animation.Animation;
  31 import android.view.animation.AnimationUtils;
  32 import android.widget.LinearLayout;
  33 import android.widget.ProgressBar;
  34 import android.widget.TextView;
  35 import android.widget.Toast;
  36
  37 import com.google.android.material.floatingactionbutton.FloatingActionButton;
  38
  39 import net.ktnx.mobileledger.R;
  40 import net.ktnx.mobileledger.async.RefreshDescriptionsTask;
  41 import net.ktnx.mobileledger.async.RetrieveTransactionsTask;
  42 import net.ktnx.mobileledger.model.Data;
  43 import net.ktnx.mobileledger.model.LedgerAccount;
  44 import net.ktnx.mobileledger.model.MobileLedgerProfile;
  45 import net.ktnx.mobileledger.ui.account_summary.AccountSummaryFragment;
  46 import net.ktnx.mobileledger.ui.profiles.ProfileDetailFragment;
  47 import net.ktnx.mobileledger.ui.profiles.ProfilesRecyclerViewAdapter;
  48 import net.ktnx.mobileledger.ui.transaction_list.TransactionListFragment;
  49 import net.ktnx.mobileledger.ui.transaction_list.TransactionListViewModel;
  50 import net.ktnx.mobileledger.utils.Colors;
  51 import net.ktnx.mobileledger.utils.MLDB;
  52
  53 import java.lang.ref.WeakReference;
  54 import java.text.DateFormat;
  55 import java.util.Date;
  56 import java.util.Observable;
  57 import java.util.Observer;
  58
  59 import androidx.appcompat.app.ActionBarDrawerToggle;
  60 import androidx.appcompat.widget.Toolbar;
  61 import androidx.core.view.GravityCompat;
  62 import androidx.drawerlayout.widget.DrawerLayout;
  63 import androidx.fragment.app.Fragment;
  64 import androidx.fragment.app.FragmentManager;
  65 import androidx.fragment.app.FragmentPagerAdapter;
  66 import androidx.recyclerview.widget.LinearLayoutManager;
  67 import androidx.recyclerview.widget.RecyclerView;
  68 import androidx.viewpager.widget.ViewPager;
  69
  70 public class MainActivity extends ProfileThemedActivity {
  71     private static final String STATE_CURRENT_PAGE = "current_page";
  72     private static final String BUNDLE_SAVED_STATE = "bundle_savedState";
  73     DrawerLayout drawer;
  74     private LinearLayout profileListContainer;
  75     private View profileListHeadArrow, profileListHeadMore, profileListHeadCancel;
  76     private LinearLayout profileListHeadMoreAndCancel;
  77     private FragmentManager fragmentManager;
  78     private TextView tvLastUpdate;
  79     private RetrieveTransactionsTask retrieveTransactionsTask;
  80     private View bTransactionListCancelDownload;
  81     private ProgressBar progressBar;
  82     private LinearLayout progressLayout;
  83     private SectionsPagerAdapter mSectionsPagerAdapter;
  84     private ViewPager mViewPager;
  85     private FloatingActionButton fab;
  86     private boolean profileModificationEnabled = false;
  87     private boolean profileListExpanded = false;
  88     private ProfilesRecyclerViewAdapter mProfileListAdapter;
  89
  90     @Override
  91     protected void onStart() {
  92         super.onStart();
  93
  94         setupProfile();
  95
  96         updateLastUpdateTextFromDB();
  97         Date lastUpdate = Data.lastUpdateDate.get();
  98
  99         long now = new Date().getTime();
 100         if ((lastUpdate == null) || (now > (lastUpdate.getTime() + (24 * 3600 * 1000)))) {
 101             if (lastUpdate == null) Log.d("db::", "WEB data never fetched. scheduling a fetch");
 102             else Log.d("db",
 103                     String.format("WEB data last fetched at %1.3f and now is %1.3f. re-fetching",
 104                             lastUpdate.getTime() / 1000f, now / 1000f));
 105
 106             scheduleTransactionListRetrieval();
 107         }
 108     }
 109     @Override
 110     protected void onSaveInstanceState(Bundle outState) {
 111         super.onSaveInstanceState(outState);
 112         outState.putInt(STATE_CURRENT_PAGE, mViewPager.getCurrentItem());
 113     }
 114     @Override
 115     protected void onCreate(Bundle savedInstanceState) {
 116         super.onCreate(savedInstanceState);
 117
 118         setContentView(R.layout.activity_main);
 119
 120         fab = findViewById(R.id.btn_add_transaction);
 121         profileListContainer = findViewById(R.id.nav_profile_list_container);
 122         profileListHeadArrow = findViewById(R.id.nav_profiles_arrow);
 123         profileListHeadMore = findViewById(R.id.nav_profiles_start_edit);
 124         profileListHeadCancel = findViewById(R.id.nav_profiles_cancel_edit);
 125         profileListHeadMoreAndCancel = findViewById(R.id.nav_profile_list_head_buttons);
 126         drawer = findViewById(R.id.drawer_layout);
 127         tvLastUpdate = findViewById(R.id.transactions_last_update);
 128         bTransactionListCancelDownload = findViewById(R.id.transaction_list_cancel_download);
 129         progressBar = findViewById(R.id.transaction_list_progress_bar);
 130         progressLayout = findViewById(R.id.transaction_progress_layout);
 131         fragmentManager = getSupportFragmentManager();
 132         mSectionsPagerAdapter = new SectionsPagerAdapter(fragmentManager);
 133         mViewPager = findViewById(R.id.root_frame);
 134
 135         Bundle extra = getIntent().getBundleExtra(BUNDLE_SAVED_STATE);
 136         if (extra != null && savedInstanceState == null) savedInstanceState = extra;
 137
 138
 139         Toolbar toolbar = findViewById(R.id.toolbar);
 140         setSupportActionBar(toolbar);
 141
 142         Data.profile.addObserver((o, arg) -> {
 143             MobileLedgerProfile profile = Data.profile.get();
 144             runOnUiThread(() -> {
 145                 if (profile == null) setTitle(R.string.app_name);
 146                 else setTitle(profile.getName());
 147                 updateLastUpdateTextFromDB();
 148                 if (profile.isPostingPermitted()) {
 149                     toolbar.setSubtitle(null);
 150                     fab.show();
 151                 }
 152                 else {
 153                     toolbar.setSubtitle(R.string.profile_subitlte_read_only);
 154                     fab.hide();
 155                 }
 156
 157                 int newProfileTheme = profile.getThemeId();
 158                 if (newProfileTheme != Colors.profileThemeId) {
 159                     Log.d("profiles", String.format("profile theme %d → %d", Colors.profileThemeId,
 160                             newProfileTheme));
 161                     profileThemeChanged();
 162                     Colors.profileThemeId = newProfileTheme;
 163                 }
 164             });
 165         });
 166
 167         ActionBarDrawerToggle toggle =
 168                 new ActionBarDrawerToggle(this, drawer, toolbar, R.string.navigation_drawer_open,
 169                         R.string.navigation_drawer_close);
 170         drawer.addDrawerListener(toggle);
 171         toggle.syncState();
 172
 173         TextView ver = drawer.findViewById(R.id.drawer_version_text);
 174
 175         try {
 176             PackageInfo pi =
 177                     getApplicationContext().getPackageManager().getPackageInfo(getPackageName(), 0);
 178             ver.setText(pi.versionName);
 179         }
 180         catch (Exception e) {
 181             e.printStackTrace();
 182         }
 183
 184         if (progressBar == null)
 185             throw new RuntimeException("Can't get hold on the transaction value progress bar");
 186         if (progressLayout == null) throw new RuntimeException(
 187                 "Can't get hold on the transaction value progress bar layout");
 188
 189         markDrawerItemCurrent(R.id.nav_account_summary);
 190
 191         mViewPager.setAdapter(mSectionsPagerAdapter);
 192         mViewPager.addOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
 193             @Override
 194             public void onPageSelected(int position) {
 195                 switch (position) {
 196                     case 0:
 197                         markDrawerItemCurrent(R.id.nav_account_summary);
 198                         break;
 199                     case 1:
 200                         markDrawerItemCurrent(R.id.nav_latest_transactions);
 201                         break;
 202                     default:
 203                         Log.e("MainActivity", String.format("Unexpected page index %d", position));
 204                 }
 205
 206                 super.onPageSelected(position);
 207             }
 208         });
 209
 210         if (savedInstanceState != null) {
 211             int currentPage = savedInstanceState.getInt(STATE_CURRENT_PAGE, -1);
 212             if (currentPage != -1) {
 213                 mViewPager.setCurrentItem(currentPage, false);
 214             }
 215         }
 216
 217         Data.lastUpdateDate.addObserver((o, arg) -> {
 218             Log.d("main", "lastUpdateDate changed");
 219             runOnUiThread(this::updateLastUpdateDisplay);
 220         });
 221
 222         updateLastUpdateDisplay();
 223
 224         findViewById(R.id.btn_no_profiles_add)
 225                 .setOnClickListener(v -> startEditProfileActivity(null));
 226
 227         findViewById(R.id.btn_add_transaction).setOnClickListener(this::fabNewTransactionClicked);
 228
 229         findViewById(R.id.nav_new_profile_button)
 230                 .setOnClickListener(v -> startEditProfileActivity(null));
 231
 232         RecyclerView root = findViewById(R.id.nav_profile_list);
 233         if (root == null)
 234             throw new RuntimeException("Can't get hold on the transaction value view");
 235
 236         mProfileListAdapter = new ProfilesRecyclerViewAdapter();
 237         root.setAdapter(mProfileListAdapter);
 238
 239         mProfileListAdapter.addEditingProfilesObserver(new Observer() {
 240             @Override
 241             public void update(Observable o, Object arg) {
 242                 if (mProfileListAdapter.isEditingProfiles()) {
 243                     profileListHeadArrow.clearAnimation();
 244                     profileListHeadArrow.setVisibility(View.GONE);
 245                     profileListHeadMore.setVisibility(View.GONE);
 246                     profileListHeadCancel.setVisibility(View.VISIBLE);
 247                 }
 248                 else {
 249                     profileListHeadArrow.setRotation(180f);
 250                     profileListHeadArrow.setVisibility(View.VISIBLE);
 251                     profileListHeadCancel.setVisibility(View.GONE);
 252                     profileListHeadMore.setVisibility(View.GONE);
 253                     profileListHeadMore
 254                             .setVisibility(profileListExpanded ? View.VISIBLE : View.GONE);
 255                 }
 256             }
 257         });
 258
 259         LinearLayoutManager llm = new LinearLayoutManager(this);
 260
 261         llm.setOrientation(RecyclerView.VERTICAL);
 262         root.setLayoutManager(llm);
 263
 264         profileListHeadMore.setOnClickListener((v) -> mProfileListAdapter.flipEditingProfiles());
 265         profileListHeadCancel.setOnClickListener((v) -> mProfileListAdapter.flipEditingProfiles());
 266         profileListHeadMoreAndCancel
 267                 .setOnClickListener((v) -> mProfileListAdapter.flipEditingProfiles());
 268
 269         drawer.addDrawerListener(new DrawerLayout.SimpleDrawerListener() {
 270             @Override
 271             public void onDrawerClosed(View drawerView) {
 272                 super.onDrawerClosed(drawerView);
 273                 collapseProfileList();
 274             }
 275         });
 276     }
 277     private void updateLastUpdateDisplay() {
 278         TextView v = findViewById(R.id.transactions_last_update);
 279         Date date = Data.lastUpdateDate.get();
 280         if (date == null) {
 281             v.setText(R.string.transaction_last_update_never);
 282             Log.d("main", "no last update date :(");
 283         }
 284         else {
 285             final String text = DateFormat.getDateTimeInstance().format(date);
 286             v.setText(text);
 287             Log.d("main", String.format("Date formatted: %s", text));
 288         }
 289     }
 290     private void profileThemeChanged() {
 291         setupProfileColors();
 292
 293         Bundle bundle = new Bundle();
 294         onSaveInstanceState(bundle);
 295         // restart activity to reflect theme change
 296         finish();
 297         Intent intent = new Intent(this, this.getClass());
 298         intent.putExtra(BUNDLE_SAVED_STATE, bundle);
 299         startActivity(intent);
 300     }
 301     public void startEditProfileActivity(MobileLedgerProfile profile) {
 302         Intent intent = new Intent(this, ProfileDetailActivity.class);
 303         Bundle args = new Bundle();
 304         if (profile != null) {
 305             int index = Data.getProfileIndex(profile);
 306             if (index != -1) intent.putExtra(ProfileDetailFragment.ARG_ITEM_ID, index);
 307         }
 308         intent.putExtras(args);
 309         startActivity(intent, args);
 310     }
 311     private void setupProfile() {
 312         String profileUUID = MLDB.getOption(MLDB.OPT_PROFILE_UUID, null);
 313         MobileLedgerProfile profile;
 314
 315         profile = MobileLedgerProfile.loadAllFromDB(profileUUID);
 316
 317         if (Data.profiles.getList().isEmpty()) {
 318             findViewById(R.id.no_profiles_layout).setVisibility(View.VISIBLE);
 319             findViewById(R.id.pager_layout).setVisibility(View.GONE);
 320             return;
 321         }
 322
 323         findViewById(R.id.pager_layout).setVisibility(View.VISIBLE);
 324         findViewById(R.id.no_profiles_layout).setVisibility(View.GONE);
 325
 326         if (profile == null) profile = Data.profiles.get(0);
 327
 328         if (profile == null) throw new AssertionError("profile must have a value");
 329
 330         Data.setCurrentProfile(profile);
 331     }
 332     public void fabNewTransactionClicked(View view) {
 333         Intent intent = new Intent(this, NewTransactionActivity.class);
 334         startActivity(intent);
 335         overridePendingTransition(R.anim.slide_in_right, R.anim.dummy);
 336     }
 337     public void navSettingsClicked(View view) {
 338         Intent intent = new Intent(this, SettingsActivity.class);
 339         startActivity(intent);
 340         drawer.closeDrawers();
 341     }
 342     public void markDrawerItemCurrent(int id) {
 343         TextView item = drawer.findViewById(id);
 344         item.setBackgroundColor(Colors.tableRowDarkBG);
 345
 346         LinearLayout actions = drawer.findViewById(R.id.nav_actions);
 347         for (int i = 0; i < actions.getChildCount(); i++) {
 348             View view = actions.getChildAt(i);
 349             if (view.getId() != id) {
 350                 view.setBackgroundColor(Color.TRANSPARENT);
 351             }
 352         }
 353     }
 354     public void onAccountSummaryClicked(View view) {
 355         drawer.closeDrawers();
 356
 357         showAccountSummaryFragment();
 358     }
 359     private void showAccountSummaryFragment() {
 360         mViewPager.setCurrentItem(0, true);
 361         TransactionListFragment.accountFilter.set(null);
 362 //        FragmentTransaction ft = fragmentManager.beginTransaction();
 363 //        accountSummaryFragment = new AccountSummaryFragment();
 364 //        ft.replace(R.id.root_frame, accountSummaryFragment);
 365 //        ft.commit();
 366 //        currentFragment = accountSummaryFragment;
 367     }
 368     public void onLatestTransactionsClicked(View view) {
 369         drawer.closeDrawers();
 370
 371         showTransactionsFragment(null);
 372     }
 373     private void resetFragmentBackStack() {
 374 //        fragmentManager.popBackStack(0, FragmentManager.POP_BACK_STACK_INCLUSIVE);
 375     }
 376     private void showTransactionsFragment(LedgerAccount account) {
 377         if (account != null) TransactionListFragment.accountFilter.set(account.getName());
 378         mViewPager.setCurrentItem(1, true);
 379 //        FragmentTransaction ft = fragmentManager.beginTransaction();
 380 //        if (transactionListFragment == null) {
 381 //            Log.d("flow", "MainActivity creating TransactionListFragment");
 382 //            transactionListFragment = new TransactionListFragment();
 383 //        }
 384 //        Bundle bundle = new Bundle();
 385 //        if (account != null) {
 386 //            bundle.putString(TransactionListFragment.BUNDLE_KEY_FILTER_ACCOUNT_NAME,
 387 //                    account.getName());
 388 //        }
 389 //        transactionListFragment.setArguments(bundle);
 390 //        ft.replace(R.id.root_frame, transactionListFragment);
 391 //        if (account != null)
 392 //            ft.addToBackStack(getResources().getString(R.string.title_activity_transaction_list));
 393 //        ft.commit();
 394 //
 395 //        currentFragment = transactionListFragment;
 396     }
 397     public void showAccountTransactions(LedgerAccount account) {
 398         showTransactionsFragment(account);
 399     }
 400     @Override
 401     public void onBackPressed() {
 402         DrawerLayout drawer = findViewById(R.id.drawer_layout);
 403         if (drawer.isDrawerOpen(GravityCompat.START)) {
 404             drawer.closeDrawer(GravityCompat.START);
 405         }
 406         else {
 407             Log.d("fragments",
 408                     String.format("manager stack: %d", fragmentManager.getBackStackEntryCount()));
 409
 410             super.onBackPressed();
 411         }
 412     }
 413     public void updateLastUpdateTextFromDB() {
 414         {
 415             final MobileLedgerProfile profile = Data.profile.get();
 416             long last_update =
 417                     (profile != null) ? profile.getLongOption(MLDB.OPT_LAST_SCRAPE, 0L) : 0;
 418
 419             Log.d("transactions", String.format("Last update = %d", last_update));
 420             if (last_update == 0) {
 421                 Data.lastUpdateDate.set(null);
 422             }
 423             else {
 424                 Data.lastUpdateDate.set(new Date(last_update));
 425             }
 426         }
 427     }
 428     public void scheduleTransactionListRetrieval() {
 429         if (Data.profile.get() == null) return;
 430
 431         retrieveTransactionsTask = new RetrieveTransactionsTask(new WeakReference<>(this));
 432
 433         retrieveTransactionsTask.execute();
 434     }
 435     public void onStopTransactionRefreshClick(View view) {
 436         Log.d("interactive", "Cancelling transactions refresh");
 437         if (retrieveTransactionsTask != null) retrieveTransactionsTask.cancel(false);
 438         bTransactionListCancelDownload.setEnabled(false);
 439     }
 440     public void onRetrieveDone(String error) {
 441         progressLayout.setVisibility(View.GONE);
 442
 443         if (error == null) {
 444             updateLastUpdateTextFromDB();
 445
 446             new RefreshDescriptionsTask().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
 447             TransactionListViewModel.scheduleTransactionListReload();
 448         }
 449         else Toast.makeText(this, error, Toast.LENGTH_LONG).show();
 450     }
 451     public void onRetrieveStart() {
 452         bTransactionListCancelDownload.setEnabled(true);
 453         progressBar.setIndeterminateTintList(ColorStateList.valueOf(Colors.primary));
 454         progressBar.setProgressTintList(ColorStateList.valueOf(Colors.primary));
 455         progressBar.setIndeterminate(true);
 456         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) progressBar.setProgress(0, false);
 457         else progressBar.setProgress(0);
 458         progressLayout.setVisibility(View.VISIBLE);
 459     }
 460     public void onRetrieveProgress(RetrieveTransactionsTask.Progress progress) {
 461         if ((progress.getTotal() == RetrieveTransactionsTask.Progress.INDETERMINATE) ||
 462             (progress.getTotal() == 0))
 463         {
 464             progressBar.setIndeterminate(true);
 465         }
 466         else {
 467             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
 468                 progressBar.setMin(0);
 469             }
 470             progressBar.setMax(progress.getTotal());
 471             if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
 472                 progressBar.setProgress(progress.getProgress(), true);
 473             }
 474             else progressBar.setProgress(progress.getProgress());
 475             progressBar.setIndeterminate(false);
 476         }
 477     }
 478     public void fabShouldShow() {
 479         MobileLedgerProfile profile = Data.profile.get();
 480         if ((profile != null) && profile.isPostingPermitted()) fab.show();
 481     }
 482     public void navProfilesHeadClicked(View view) {
 483         if (profileListExpanded) {
 484             collapseProfileList();
 485         }
 486         else {
 487             expandProfileList();
 488         }
 489     }
 490     private void expandProfileList() {
 491         profileListExpanded = true;
 492
 493
 494         profileListContainer.setVisibility(View.VISIBLE);
 495         profileListContainer.startAnimation(AnimationUtils.loadAnimation(this, R.anim.slide_down));
 496         profileListHeadArrow.startAnimation(AnimationUtils.loadAnimation(this, R.anim.rotate_180));
 497         profileListHeadMore.setVisibility(View.VISIBLE);
 498         profileListHeadMore.startAnimation(AnimationUtils.loadAnimation(this, R.anim.fade_in));
 499         findViewById(R.id.nav_profile_list).setMinimumHeight(
 500                 (int) (getResources().getDimension(R.dimen.thumb_row_height) *
 501                        Data.profiles.size()));
 502     }
 503     private void collapseProfileList() {
 504         profileListExpanded = false;
 505
 506         final Animation animation = AnimationUtils.loadAnimation(this, R.anim.slide_up);
 507         animation.setAnimationListener(new Animation.AnimationListener() {
 508             @Override
 509             public void onAnimationStart(Animation animation) {
 510
 511             }
 512             @Override
 513             public void onAnimationEnd(Animation animation) {
 514                 profileListContainer.setVisibility(View.GONE);
 515             }
 516             @Override
 517             public void onAnimationRepeat(Animation animation) {
 518
 519             }
 520         });
 521         mProfileListAdapter.stopEditingProfiles();
 522
 523         profileListContainer.startAnimation(animation);
 524         profileListHeadArrow.setRotation(0f);
 525         profileListHeadArrow
 526                 .startAnimation(AnimationUtils.loadAnimation(this, R.anim.rotate_180_back));
 527         profileListHeadMore.setVisibility(View.GONE);
 528     }
 529     public void onProfileRowClicked(View v) {
 530         Data.setCurrentProfile((MobileLedgerProfile) v.getTag());
 531     }
 532     public void enableProfileModifications() {
 533         profileModificationEnabled = true;
 534         ViewGroup profileList = findViewById(R.id.nav_profile_list);
 535         for (int i = 0; i < profileList.getChildCount(); i++) {
 536             View aRow = profileList.getChildAt(i);
 537             aRow.findViewById(R.id.profile_list_edit_button).setVisibility(View.VISIBLE);
 538             aRow.findViewById(R.id.profile_list_rearrange_handle).setVisibility(View.VISIBLE);
 539         }
 540         // FIXME enable rearranging
 541
 542     }
 543     public void disableProfileModifications() {
 544         profileModificationEnabled = false;
 545         ViewGroup profileList = findViewById(R.id.nav_profile_list);
 546         for (int i = 0; i < profileList.getChildCount(); i++) {
 547             View aRow = profileList.getChildAt(i);
 548             aRow.findViewById(R.id.profile_list_edit_button).setVisibility(View.GONE);
 549             aRow.findViewById(R.id.profile_list_rearrange_handle).setVisibility(View.INVISIBLE);
 550         }
 551         // FIXME disable rearranging
 552
 553     }
 554
 555     public class SectionsPagerAdapter extends FragmentPagerAdapter {
 556
 557         public SectionsPagerAdapter(FragmentManager fm) {
 558             super(fm);
 559         }
 560
 561         @Override
 562         public Fragment getItem(int position) {
 563             Log.d("main", String.format("Switching to fragment %d", position));
 564             switch (position) {
 565                 case 0:
 566                     return new AccountSummaryFragment();
 567                 case 1:
 568                     return new TransactionListFragment();
 569                 default:
 570                     throw new IllegalStateException(
 571                             String.format("Unexpected fragment index: " + "%d", position));
 572             }
 573         }
 574
 575         @Override
 576         public int getCount() {
 577             return 2;
 578         }
 579     }
 580
 581 }