app/src/main/java/net/ktnx/mobileledger/ui/activity/NewTransactionActivity.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.annotation.SuppressLint;
  21 import android.database.Cursor;
  22 import android.os.AsyncTask;
  23 import android.os.Bundle;
  24 import android.text.Editable;
  25 import android.text.InputType;
  26 import android.text.TextWatcher;
  27 import android.util.Log;
  28 import android.util.TypedValue;
  29 import android.view.Gravity;
  30 import android.view.Menu;
  31 import android.view.MenuItem;
  32 import android.view.MotionEvent;
  33 import android.view.View;
  34 import android.view.inputmethod.EditorInfo;
  35 import android.widget.AutoCompleteTextView;
  36 import android.widget.EditText;
  37 import android.widget.ProgressBar;
  38 import android.widget.TableLayout;
  39 import android.widget.TableRow;
  40 import android.widget.TextView;
  41 import android.widget.Toast;
  42
  43 import com.google.android.material.floatingactionbutton.FloatingActionButton;
  44 import com.google.android.material.snackbar.BaseTransientBottomBar;
  45 import com.google.android.material.snackbar.Snackbar;
  46
  47 import net.ktnx.mobileledger.BuildConfig;
  48 import net.ktnx.mobileledger.R;
  49 import net.ktnx.mobileledger.async.DescriptionSelectedCallback;
  50 import net.ktnx.mobileledger.async.SendTransactionTask;
  51 import net.ktnx.mobileledger.async.TaskCallback;
  52 import net.ktnx.mobileledger.model.Data;
  53 import net.ktnx.mobileledger.model.LedgerTransaction;
  54 import net.ktnx.mobileledger.model.LedgerTransactionAccount;
  55 import net.ktnx.mobileledger.model.MobileLedgerProfile;
  56 import net.ktnx.mobileledger.ui.DatePickerFragment;
  57 import net.ktnx.mobileledger.ui.OnSwipeTouchListener;
  58 import net.ktnx.mobileledger.utils.Globals;
  59 import net.ktnx.mobileledger.utils.MLDB;
  60
  61 import java.text.ParseException;
  62 import java.util.ArrayList;
  63 import java.util.Date;
  64 import java.util.Locale;
  65 import java.util.Objects;
  66
  67 import androidx.appcompat.widget.Toolbar;
  68 import androidx.fragment.app.DialogFragment;
  69
  70 /*
  71  * TODO: nicer progress while transaction is submitted
  72  * TODO: reports
  73  * TODO: get rid of the custom session/cookie and auth code?
  74  *         (the last problem with the POST was the missing content-length header)
  75  *  */
  76
  77 public class NewTransactionActivity extends ProfileThemedActivity
  78         implements TaskCallback, DescriptionSelectedCallback {
  79     private static SendTransactionTask saver;
  80     private TableLayout table;
  81     private ProgressBar progress;
  82     private FloatingActionButton fab;
  83     private TextView tvDate;
  84     private AutoCompleteTextView tvDescription;
  85     private static boolean isZero(float f) {
  86         return (f < 0.005) && (f > -0.005);
  87     }
  88     @Override
  89     protected void onCreate(Bundle savedInstanceState) {
  90         super.onCreate(savedInstanceState);
  91
  92         setContentView(R.layout.activity_new_transaction);
  93         Toolbar toolbar = findViewById(R.id.toolbar);
  94         setSupportActionBar(toolbar);
  95         toolbar.setSubtitle(mProfile.getName());
  96
  97         tvDate = findViewById(R.id.new_transaction_date);
  98         tvDate.setOnFocusChangeListener((v, hasFocus) -> {
  99             if (hasFocus) pickTransactionDate(v);
 100         });
 101         tvDescription = findViewById(R.id.new_transaction_description);
 102         MLDB.hookAutocompletionAdapter(this, tvDescription, MLDB.DESCRIPTION_HISTORY_TABLE,
 103                 "description", false, findViewById(R.id.new_transaction_acc_1), this, mProfile);
 104         hookTextChangeListener(tvDescription);
 105
 106         progress = findViewById(R.id.save_transaction_progress);
 107         fab = findViewById(R.id.fab);
 108         fab.setOnClickListener(v -> saveTransaction());
 109
 110         Objects.requireNonNull(getSupportActionBar()).setDisplayHomeAsUpEnabled(true);
 111         table = findViewById(R.id.new_transaction_accounts_table);
 112         for (int i = 0; i < table.getChildCount(); i++) {
 113             TableRow row = (TableRow) table.getChildAt(i);
 114             AutoCompleteTextView tvAccountName = (AutoCompleteTextView) row.getChildAt(0);
 115             TextView tvAmount = (TextView) row.getChildAt(1);
 116             hookSwipeListener(row);
 117             MLDB.hookAutocompletionAdapter(this, tvAccountName, MLDB.ACCOUNTS_TABLE, "name", true,
 118                     tvAmount, null, mProfile);
 119             hookTextChangeListener(tvAccountName);
 120             hookTextChangeListener(tvAmount);
 121 //            Log.d("swipe", "hooked to row "+i);
 122         }
 123     }
 124     @Override
 125     protected void initProfile() {
 126         String profileUUID = getIntent().getStringExtra("profile_uuid");
 127
 128         if (profileUUID != null) {
 129             mProfile = Data.getProfile(profileUUID);
 130             if (mProfile == null) finish();
 131         }
 132         else super.initProfile();
 133     }
 134     @Override
 135     public void finish() {
 136         super.finish();
 137         overridePendingTransition(R.anim.dummy, R.anim.slide_out_right);
 138     }
 139
 140     @Override
 141     public boolean onOptionsItemSelected(MenuItem item) {
 142         switch (item.getItemId()) {
 143             case android.R.id.home:
 144                 finish();
 145                 return true;
 146         }
 147         return super.onOptionsItemSelected(item);
 148     }
 149     @Override
 150     protected void onStart() {
 151         super.onStart();
 152         if (tvDescription.getText().toString().isEmpty()) tvDescription.requestFocus();
 153     }
 154     public void saveTransaction() {
 155         if (fab != null) fab.setEnabled(false);
 156         toggleAllEditing(false);
 157         progress.setVisibility(View.VISIBLE);
 158         try {
 159
 160             saver = new SendTransactionTask(this, mProfile);
 161
 162             String dateString = tvDate.getText().toString();
 163             Date date;
 164             if (dateString.isEmpty()) date = new Date();
 165             else date = Globals.parseLedgerDate(dateString);
 166             LedgerTransaction tr = new LedgerTransaction(null, date, tvDescription.getText().toString(), mProfile);
 167
 168             TableLayout table = findViewById(R.id.new_transaction_accounts_table);
 169             LedgerTransactionAccount emptyAmountAccount = null;
 170             float emptyAmountAccountBalance = 0;
 171             for (int i = 0; i < table.getChildCount(); i++) {
 172                 TableRow row = (TableRow) table.getChildAt(i);
 173                 String acc = ((TextView) row.getChildAt(0)).getText().toString();
 174                 if (acc.isEmpty()) continue;
 175
 176                 String amt = ((TextView) row.getChildAt(1)).getText().toString();
 177                 LedgerTransactionAccount item;
 178                 if (amt.length() > 0) {
 179                     final float amount = Float.parseFloat(amt);
 180                     item = new LedgerTransactionAccount(acc, amount);
 181                     emptyAmountAccountBalance += amount;
 182                 }
 183                 else {
 184                     item = new LedgerTransactionAccount(acc);
 185                     emptyAmountAccount = item;
 186                 }
 187
 188                 tr.addAccount(item);
 189             }
 190
 191             if (emptyAmountAccount != null)
 192                 emptyAmountAccount.setAmount(-emptyAmountAccountBalance);
 193             saver.execute(tr);
 194         }
 195         catch (ParseException e) {
 196             Log.d("new-transaction", "Parse error", e);
 197             Toast.makeText(this, getResources().getString(R.string.error_invalid_date),
 198                     Toast.LENGTH_LONG).show();
 199             tvDate.requestFocus();
 200
 201             progress.setVisibility(View.GONE);
 202             toggleAllEditing(true);
 203             if (fab != null) fab.setEnabled(true);
 204         }
 205         catch (Exception e) {
 206             Log.d("new-transaction", "Unknown error", e);
 207
 208             progress.setVisibility(View.GONE);
 209             toggleAllEditing(true);
 210             if (fab != null) fab.setEnabled(true);
 211         }
 212     }
 213     private void toggleAllEditing(boolean enabled) {
 214         tvDate.setEnabled(enabled);
 215         tvDescription.setEnabled(enabled);
 216         TableLayout table = findViewById(R.id.new_transaction_accounts_table);
 217         for (int i = 0; i < table.getChildCount(); i++) {
 218             TableRow row = (TableRow) table.getChildAt(i);
 219             for (int j = 0; j < row.getChildCount(); j++) {
 220                 row.getChildAt(j).setEnabled(enabled);
 221             }
 222         }
 223     }
 224     private void hookSwipeListener(final TableRow row) {
 225         row.getChildAt(0).setOnTouchListener(new OnSwipeTouchListener(this) {
 226             private void onSwipeAside() {
 227                 if (table.getChildCount() > 2) {
 228                     TableRow prev_row = (TableRow) table.getChildAt(table.indexOfChild(row) - 1);
 229                     TableRow next_row = (TableRow) table.getChildAt(table.indexOfChild(row) + 1);
 230                     TextView prev_amt =
 231                             (prev_row != null) ? (TextView) prev_row.getChildAt(1) : tvDescription;
 232                     TextView next_acc =
 233                             (next_row != null) ? (TextView) next_row.getChildAt(0) : null;
 234
 235                     if (next_acc == null) {
 236                         prev_amt.setNextFocusRightId(R.id.none);
 237                         prev_amt.setNextFocusForwardId(R.id.none);
 238                         prev_amt.setImeOptions(EditorInfo.IME_ACTION_DONE);
 239                     }
 240                     else {
 241                         prev_amt.setNextFocusRightId(next_acc.getId());
 242                         prev_amt.setNextFocusForwardId(next_acc.getId());
 243                         prev_amt.setImeOptions(EditorInfo.IME_ACTION_NEXT);
 244                     }
 245
 246                     if (row.hasFocus()) {
 247                         if (next_acc != null) next_acc.requestFocus();
 248                         else prev_amt.requestFocus();
 249                     }
 250
 251                     table.removeView(row);
 252                     check_transaction_submittable();
 253 //                    Toast.makeText(NewTransactionActivity.this, "LEFT", Toast.LENGTH_LONG).show();
 254                 }
 255                 else {
 256                     Snackbar.make(table, R.string.msg_at_least_two_accounts_are_required,
 257                             Snackbar.LENGTH_LONG).setAction("Action", null).show();
 258                 }
 259             }
 260             public void onSwipeLeft() {
 261                 onSwipeAside();
 262             }
 263             public void onSwipeRight() {
 264                 onSwipeAside();
 265             }
 266             //            @Override
 267 //            public boolean performClick(View view, MotionEvent m) {
 268 //                return true;
 269 //            }
 270             public boolean onTouch(View view, MotionEvent m) {
 271                 return gestureDetector.onTouchEvent(m);
 272             }
 273         });
 274     }
 275
 276     public boolean simulateCrash(MenuItem item) {
 277         Log.d("crash", "Will crash intentionally");
 278         new AsyncCrasher().execute();
 279         return true;
 280     }
 281     public boolean onCreateOptionsMenu(Menu menu) {
 282         // Inflate the menu; this adds items to the action bar if it is present.
 283         getMenuInflater().inflate(R.menu.new_transaction, menu);
 284
 285         if (BuildConfig.DEBUG) {
 286             menu.findItem(R.id.action_simulate_crash).setVisible(true);
 287         }
 288         check_transaction_submittable();
 289
 290         return true;
 291     }
 292
 293     public void pickTransactionDate(View view) {
 294         DialogFragment picker = new DatePickerFragment();
 295         picker.show(getSupportFragmentManager(), "datePicker");
 296     }
 297
 298     public int dp2px(float dp) {
 299         return Math.round(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp,
 300                 getResources().getDisplayMetrics()));
 301     }
 302     private void hookTextChangeListener(final TextView view) {
 303         view.addTextChangedListener(new TextWatcher() {
 304             @Override
 305             public void beforeTextChanged(CharSequence s, int start, int count, int after) {
 306
 307             }
 308
 309             @Override
 310             public void onTextChanged(CharSequence s, int start, int before, int count) {
 311
 312             }
 313
 314             @Override
 315             public void afterTextChanged(Editable s) {
 316 //                Log.d("input", "text changed");
 317                 check_transaction_submittable();
 318             }
 319         });
 320
 321     }
 322     private TableRow doAddAccountRow(boolean focus) {
 323         final AutoCompleteTextView acc = new AutoCompleteTextView(this);
 324         acc.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.MATCH_PARENT,
 325                 TableRow.LayoutParams.WRAP_CONTENT, 9f));
 326         acc.setHint(R.string.new_transaction_account_hint);
 327         acc.setWidth(0);
 328         acc.setImeOptions(EditorInfo.IME_ACTION_NEXT | EditorInfo.IME_FLAG_NO_ENTER_ACTION |
 329                           EditorInfo.IME_FLAG_NAVIGATE_NEXT);
 330         acc.setSingleLine(true);
 331
 332         final EditText amt = new EditText(this);
 333         amt.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT,
 334                 TableRow.LayoutParams.MATCH_PARENT, 1f));
 335         amt.setHint(R.string.new_transaction_amount_hint);
 336         amt.setWidth(0);
 337         amt.setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_SIGNED |
 338                          InputType.TYPE_NUMBER_FLAG_DECIMAL);
 339         amt.setMinWidth(dp2px(40));
 340         amt.setTextAlignment(EditText.TEXT_ALIGNMENT_VIEW_END);
 341         amt.setImeOptions(EditorInfo.IME_ACTION_DONE);
 342         amt.setSelectAllOnFocus(true);
 343
 344         // forward navigation support
 345         final TableRow last_row = (TableRow) table.getChildAt(table.getChildCount() - 1);
 346         final TextView last_amt = (TextView) last_row.getChildAt(1);
 347         last_amt.setNextFocusForwardId(acc.getId());
 348         last_amt.setNextFocusRightId(acc.getId());
 349         last_amt.setImeOptions(EditorInfo.IME_ACTION_NEXT);
 350         acc.setNextFocusForwardId(amt.getId());
 351         acc.setNextFocusRightId(amt.getId());
 352
 353         final TableRow row = new TableRow(this);
 354         row.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.MATCH_PARENT,
 355                 TableRow.LayoutParams.MATCH_PARENT));
 356         row.setGravity(Gravity.BOTTOM);
 357         row.addView(acc);
 358         row.addView(amt);
 359         table.addView(row);
 360
 361         if (focus) acc.requestFocus();
 362
 363         hookSwipeListener(row);
 364         MLDB.hookAutocompletionAdapter(this, acc, MLDB.ACCOUNTS_TABLE, "name", true, amt, null,
 365                 mProfile);
 366         hookTextChangeListener(acc);
 367         hookTextChangeListener(amt);
 368
 369         return row;
 370     }
 371     public void addTransactionAccountFromMenu(MenuItem item) {
 372         doAddAccountRow(true);
 373     }
 374     public void resetTransactionFromMenu(MenuItem item) {
 375         resetForm();
 376     }
 377     public void saveTransactionFromMenu(MenuItem item) {
 378         saveTransaction();
 379     }
 380     // rules:
 381     // 1) at least two account names
 382     // 2) each amount must have account name
 383     // 3) amounts must balance to 0, or
 384     // 3a) there must be exactly one empty amount
 385     // 4) empty accounts with empty amounts are ignored
 386     // 5) a row with an empty account name or empty amount is guaranteed to exist
 387     @SuppressLint("DefaultLocale")
 388     private void check_transaction_submittable() {
 389         TableLayout table = findViewById(R.id.new_transaction_accounts_table);
 390         int accounts = 0;
 391         int accounts_with_values = 0;
 392         int amounts = 0;
 393         int amounts_with_accounts = 0;
 394         int empty_rows = 0;
 395         TextView empty_amount = null;
 396         boolean single_empty_amount = false;
 397         boolean single_empty_amount_has_account = false;
 398         float running_total = 0f;
 399         boolean have_description =
 400                 !((TextView) findViewById(R.id.new_transaction_description)).getText().toString()
 401                         .isEmpty();
 402
 403         try {
 404             for (int i = 0; i < table.getChildCount(); i++) {
 405                 TableRow row = (TableRow) table.getChildAt(i);
 406
 407                 TextView acc_name_v = (TextView) row.getChildAt(0);
 408                 TextView amount_v = (TextView) row.getChildAt(1);
 409                 String amt = String.valueOf(amount_v.getText());
 410                 String acc_name = String.valueOf(acc_name_v.getText());
 411                 acc_name = acc_name.trim();
 412
 413                 if (!acc_name.isEmpty()) {
 414                     accounts++;
 415
 416                     if (!amt.isEmpty()) {
 417                         accounts_with_values++;
 418                     }
 419                 }
 420                 else empty_rows++;
 421
 422                 if (amt.isEmpty()) {
 423                     amount_v.setHint(String.format("%1.2f", 0f));
 424                     if (empty_amount == null) {
 425                         empty_amount = amount_v;
 426                         single_empty_amount = true;
 427                         single_empty_amount_has_account = !acc_name.isEmpty();
 428                     }
 429                     else if (!acc_name.isEmpty()) single_empty_amount = false;
 430                 }
 431                 else {
 432                     amounts++;
 433                     if (!acc_name.isEmpty()) amounts_with_accounts++;
 434                     running_total += Float.valueOf(amt);
 435                 }
 436             }
 437
 438             if ((empty_rows == 0) &&
 439                 ((table.getChildCount() == accounts) || (table.getChildCount() == amounts)))
 440             {
 441                 doAddAccountRow(false);
 442             }
 443
 444             Log.d("submittable", String.format("accounts=%d, accounts_with_values=%s, " +
 445                                                "amounts_with_accounts=%d, amounts=%d, running_total=%1.2f, " +
 446                                                "single_empty_with_acc=%s", accounts,
 447                     accounts_with_values, amounts_with_accounts, amounts, running_total,
 448                     (single_empty_amount && single_empty_amount_has_account) ? "true" : "false"));
 449
 450             if (have_description && (accounts >= 2) && (accounts_with_values >= (accounts - 1)) &&
 451                 (amounts_with_accounts == amounts) &&
 452                 (single_empty_amount && single_empty_amount_has_account || isZero(running_total)))
 453             {
 454                 if (fab != null) {
 455                     fab.show();
 456                     fab.setEnabled(true);
 457                 }
 458             }
 459             else {
 460                 if (fab != null) fab.hide();
 461             }
 462
 463             if (single_empty_amount) {
 464                 empty_amount.setHint(String.format("%1.2f",
 465                         (Math.abs(running_total) > 0.005) ? -running_total : 0f));
 466             }
 467
 468         }
 469         catch (NumberFormatException e) {
 470             if (fab != null) fab.hide();
 471         }
 472         catch (Exception e) {
 473             e.printStackTrace();
 474             if (fab != null) fab.hide();
 475         }
 476     }
 477
 478     @Override
 479     public void done(String error) {
 480         progress.setVisibility(View.INVISIBLE);
 481         Log.d("visuals", "hiding progress");
 482
 483         if (error == null) resetForm();
 484         else Snackbar.make(findViewById(R.id.new_transaction_accounts_table), error,
 485                 BaseTransientBottomBar.LENGTH_LONG).show();
 486
 487         toggleAllEditing(true);
 488         check_transaction_submittable();
 489     }
 490
 491     private void resetForm() {
 492         tvDate.setText("");
 493         tvDescription.setText("");
 494
 495         tvDescription.requestFocus();
 496
 497         while (table.getChildCount() > 2) {
 498             table.removeViewAt(2);
 499         }
 500         for (int i = 0; i < 2; i++) {
 501             TableRow tr = (TableRow) table.getChildAt(i);
 502             if (tr == null) break;
 503
 504             ((TextView) tr.getChildAt(0)).setText("");
 505             ((TextView) tr.getChildAt(1)).setText("");
 506         }
 507     }
 508     @Override
 509     public void descriptionSelected(String description) {
 510         Log.d("descr selected", description);
 511         if (!inputStateIsInitial()) return;
 512
 513         String accFilter = mProfile.getPreferredAccountsFilter();
 514
 515         ArrayList<String> params = new ArrayList<>();
 516         StringBuilder sb = new StringBuilder(
 517                 "select t.profile, t.id from transactions t where t.description=?");
 518         params.add(description);
 519
 520         if (accFilter != null) {
 521             sb.append(" AND EXISTS (").append("SELECT 1 FROM transaction_accounts ta ")
 522                     .append("WHERE ta.profile = t.profile").append(" AND ta.transaction_id = t.id")
 523                     .append(" AND UPPER(ta.account_name) LIKE '%'||?||'%')");
 524             params.add(accFilter.toUpperCase());
 525         }
 526
 527         sb.append(" ORDER BY date desc limit 1");
 528
 529         final String sql = sb.toString();
 530         Log.d("descr", sql);
 531         Log.d("descr", params.toString());
 532
 533         try (Cursor c = MLDB.getDatabase().rawQuery(sql, params.toArray(new String[]{}))) {
 534             if (!c.moveToNext()) return;
 535
 536             String profileUUID = c.getString(0);
 537             int transactionId = c.getInt(1);
 538             LedgerTransaction tr;
 539             MobileLedgerProfile profile = Data.getProfile(profileUUID);
 540             if (profile == null) throw new RuntimeException(String.format(
 541                     "Unable to find profile %s, which is supposed to contain " +
 542                     "transaction %d with description %s", profileUUID, transactionId, description));
 543
 544             tr = profile.loadTransaction(transactionId);
 545             table = findViewById(R.id.new_transaction_accounts_table);
 546             ArrayList<LedgerTransactionAccount> accounts = tr.getAccounts();
 547             TableRow firstNegative = null;
 548             int negativeCount = 0;
 549             for (int i = 0; i < accounts.size(); i++) {
 550                 LedgerTransactionAccount acc = accounts.get(i);
 551                 TableRow row = (TableRow) table.getChildAt(i);
 552                 if (row == null) row = doAddAccountRow(false);
 553
 554                 ((TextView) row.getChildAt(0)).setText(acc.getAccountName());
 555                 ((TextView) row.getChildAt(1))
 556                         .setText(String.format(Locale.US, "%1.2f", acc.getAmount()));
 557
 558                 if (acc.getAmount() < 0.005) {
 559                     if (firstNegative == null) firstNegative = row;
 560                     negativeCount++;
 561                 }
 562             }
 563
 564             if (negativeCount == 1) {
 565                 ((TextView) firstNegative.getChildAt(1)).setText(null);
 566             }
 567
 568             check_transaction_submittable();
 569
 570             EditText firstAmount = (EditText) ((TableRow) table.getChildAt(0)).getChildAt(1);
 571             String amtString = String.valueOf(firstAmount.getText());
 572             firstAmount.requestFocus();
 573             firstAmount.setSelection(0, amtString.length());
 574         }
 575
 576     }
 577     private boolean inputStateIsInitial() {
 578         table = findViewById(R.id.new_transaction_accounts_table);
 579
 580         if (table.getChildCount() != 2) return false;
 581
 582         for (int i = 0; i < 2; i++) {
 583             TableRow row = (TableRow) table.getChildAt(i);
 584             if (((TextView) row.getChildAt(0)).getText().length() > 0) return false;
 585             if (((TextView) row.getChildAt(1)).getText().length() > 0) return false;
 586         }
 587
 588         return true;
 589     }
 590     private class AsyncCrasher extends AsyncTask<Void, Void, Void> {
 591         @Override
 592         protected Void doInBackground(Void... voids) {
 593             throw new RuntimeException("Simulated crash");
 594         }
 595     }
 596 }