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.TypedValue;
  28 import android.view.Gravity;
  29 import android.view.Menu;
  30 import android.view.MenuItem;
  31 import android.view.MotionEvent;
  32 import android.view.View;
  33 import android.view.inputmethod.EditorInfo;
  34 import android.widget.AutoCompleteTextView;
  35 import android.widget.EditText;
  36 import android.widget.ProgressBar;
  37 import android.widget.TableLayout;
  38 import android.widget.TableRow;
  39 import android.widget.TextView;
  40 import android.widget.Toast;
  41
  42 import com.google.android.material.floatingactionbutton.FloatingActionButton;
  43 import com.google.android.material.snackbar.BaseTransientBottomBar;
  44 import com.google.android.material.snackbar.Snackbar;
  45
  46 import net.ktnx.mobileledger.App;
  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 import static net.ktnx.mobileledger.utils.Logger.debug;
  71
  72 /*
  73  * TODO: nicer progress while transaction is submitted
  74  * TODO: reports
  75  * TODO: get rid of the custom session/cookie and auth code?
  76  *         (the last problem with the POST was the missing content-length header)
  77  *  */
  78
  79 public class NewTransactionActivity extends ProfileThemedActivity
  80         implements TaskCallback, DescriptionSelectedCallback {
  81     private static SendTransactionTask saver;
  82     private TableLayout table;
  83     private ProgressBar progress;
  84     private FloatingActionButton fab;
  85     private TextView tvDate;
  86     private AutoCompleteTextView tvDescription;
  87     private static boolean isZero(float f) {
  88         return (f < 0.005) && (f > -0.005);
  89     }
  90     @Override
  91     protected void onCreate(Bundle savedInstanceState) {
  92         super.onCreate(savedInstanceState);
  93
  94         setContentView(R.layout.activity_new_transaction);
  95         Toolbar toolbar = findViewById(R.id.toolbar);
  96         setSupportActionBar(toolbar);
  97         toolbar.setSubtitle(mProfile.getName());
  98
  99         tvDate = findViewById(R.id.new_transaction_date);
 100         tvDate.setOnFocusChangeListener((v, hasFocus) -> {
 101             if (hasFocus) pickTransactionDate(v);
 102         });
 103         tvDescription = findViewById(R.id.new_transaction_description);
 104         MLDB.hookAutocompletionAdapter(this, tvDescription, MLDB.DESCRIPTION_HISTORY_TABLE,
 105                 "description", false, findViewById(R.id.new_transaction_acc_1), this, mProfile);
 106         hookTextChangeListener(tvDescription);
 107
 108         progress = findViewById(R.id.save_transaction_progress);
 109         fab = findViewById(R.id.fab);
 110         fab.setOnClickListener(v -> saveTransaction());
 111
 112         Objects.requireNonNull(getSupportActionBar()).setDisplayHomeAsUpEnabled(true);
 113         table = findViewById(R.id.new_transaction_accounts_table);
 114         for (int i = 0; i < table.getChildCount(); i++) {
 115             TableRow row = (TableRow) table.getChildAt(i);
 116             AutoCompleteTextView tvAccountName = (AutoCompleteTextView) row.getChildAt(0);
 117             TextView tvAmount = (TextView) row.getChildAt(1);
 118             hookSwipeListener(row);
 119             MLDB.hookAutocompletionAdapter(this, tvAccountName, MLDB.ACCOUNTS_TABLE, "name", true,
 120                     tvAmount, null, mProfile);
 121             hookTextChangeListener(tvAccountName);
 122             hookTextChangeListener(tvAmount);
 123 //            debug("swipe", "hooked to row "+i);
 124         }
 125     }
 126     @Override
 127     protected void initProfile() {
 128         String profileUUID = getIntent().getStringExtra("profile_uuid");
 129
 130         if (profileUUID != null) {
 131             mProfile = Data.getProfile(profileUUID);
 132             if (mProfile == null) finish();
 133         }
 134         else super.initProfile();
 135     }
 136     @Override
 137     public void finish() {
 138         super.finish();
 139         overridePendingTransition(R.anim.dummy, R.anim.slide_out_right);
 140     }
 141
 142     @Override
 143     public boolean onOptionsItemSelected(MenuItem item) {
 144         switch (item.getItemId()) {
 145             case android.R.id.home:
 146                 finish();
 147                 return true;
 148         }
 149         return super.onOptionsItemSelected(item);
 150     }
 151     @Override
 152     protected void onStart() {
 153         super.onStart();
 154         if (tvDescription.getText().toString().isEmpty()) tvDescription.requestFocus();
 155     }
 156     public void saveTransaction() {
 157         if (fab != null) fab.setEnabled(false);
 158         toggleAllEditing(false);
 159         progress.setVisibility(View.VISIBLE);
 160         try {
 161
 162             saver = new SendTransactionTask(this, mProfile);
 163
 164             String dateString = tvDate.getText().toString();
 165             Date date;
 166             if (dateString.isEmpty()) date = new Date();
 167             else date = Globals.parseLedgerDate(dateString);
 168             LedgerTransaction tr = new LedgerTransaction(null, date, tvDescription.getText().toString(), mProfile);
 169
 170             TableLayout table = findViewById(R.id.new_transaction_accounts_table);
 171             LedgerTransactionAccount emptyAmountAccount = null;
 172             float emptyAmountAccountBalance = 0;
 173             for (int i = 0; i < table.getChildCount(); i++) {
 174                 TableRow row = (TableRow) table.getChildAt(i);
 175                 String acc = ((TextView) row.getChildAt(0)).getText().toString();
 176                 if (acc.isEmpty()) continue;
 177
 178                 String amt = ((TextView) row.getChildAt(1)).getText().toString();
 179                 LedgerTransactionAccount item;
 180                 if (amt.length() > 0) {
 181                     final float amount = Float.parseFloat(amt);
 182                     item = new LedgerTransactionAccount(acc, amount);
 183                     emptyAmountAccountBalance += amount;
 184                 }
 185                 else {
 186                     item = new LedgerTransactionAccount(acc);
 187                     emptyAmountAccount = item;
 188                 }
 189
 190                 tr.addAccount(item);
 191             }
 192
 193             if (emptyAmountAccount != null)
 194                 emptyAmountAccount.setAmount(-emptyAmountAccountBalance);
 195             saver.execute(tr);
 196         }
 197         catch (ParseException e) {
 198             debug("new-transaction", "Parse error", e);
 199             Toast.makeText(this, getResources().getString(R.string.error_invalid_date),
 200                     Toast.LENGTH_LONG).show();
 201             tvDate.requestFocus();
 202
 203             progress.setVisibility(View.GONE);
 204             toggleAllEditing(true);
 205             if (fab != null) fab.setEnabled(true);
 206         }
 207         catch (Exception e) {
 208             debug("new-transaction", "Unknown error", e);
 209
 210             progress.setVisibility(View.GONE);
 211             toggleAllEditing(true);
 212             if (fab != null) fab.setEnabled(true);
 213         }
 214     }
 215     private void toggleAllEditing(boolean enabled) {
 216         tvDate.setEnabled(enabled);
 217         tvDescription.setEnabled(enabled);
 218         TableLayout table = findViewById(R.id.new_transaction_accounts_table);
 219         for (int i = 0; i < table.getChildCount(); i++) {
 220             TableRow row = (TableRow) table.getChildAt(i);
 221             for (int j = 0; j < row.getChildCount(); j++) {
 222                 row.getChildAt(j).setEnabled(enabled);
 223             }
 224         }
 225     }
 226     private void hookSwipeListener(final TableRow row) {
 227         row.getChildAt(0).setOnTouchListener(new OnSwipeTouchListener(this) {
 228             private void onSwipeAside() {
 229                 if (table.getChildCount() > 2) {
 230                     TableRow prev_row = (TableRow) table.getChildAt(table.indexOfChild(row) - 1);
 231                     TableRow next_row = (TableRow) table.getChildAt(table.indexOfChild(row) + 1);
 232                     TextView prev_amt =
 233                             (prev_row != null) ? (TextView) prev_row.getChildAt(1) : tvDescription;
 234                     TextView next_acc =
 235                             (next_row != null) ? (TextView) next_row.getChildAt(0) : null;
 236
 237                     if (next_acc == null) {
 238                         prev_amt.setNextFocusRightId(R.id.none);
 239                         prev_amt.setNextFocusForwardId(R.id.none);
 240                         prev_amt.setImeOptions(EditorInfo.IME_ACTION_DONE);
 241                     }
 242                     else {
 243                         prev_amt.setNextFocusRightId(next_acc.getId());
 244                         prev_amt.setNextFocusForwardId(next_acc.getId());
 245                         prev_amt.setImeOptions(EditorInfo.IME_ACTION_NEXT);
 246                     }
 247
 248                     if (row.hasFocus()) {
 249                         if (next_acc != null) next_acc.requestFocus();
 250                         else prev_amt.requestFocus();
 251                     }
 252
 253                     table.removeView(row);
 254                     check_transaction_submittable();
 255 //                    Toast.makeText(NewTransactionActivity.this, "LEFT", Toast.LENGTH_LONG).show();
 256                 }
 257                 else {
 258                     Snackbar.make(table, R.string.msg_at_least_two_accounts_are_required,
 259                             Snackbar.LENGTH_LONG).setAction("Action", null).show();
 260                 }
 261             }
 262             public void onSwipeLeft() {
 263                 onSwipeAside();
 264             }
 265             public void onSwipeRight() {
 266                 onSwipeAside();
 267             }
 268             //            @Override
 269 //            public boolean performClick(View view, MotionEvent m) {
 270 //                return true;
 271 //            }
 272             public boolean onTouch(View view, MotionEvent m) {
 273                 return gestureDetector.onTouchEvent(m);
 274             }
 275         });
 276     }
 277
 278     public boolean simulateCrash(MenuItem item) {
 279         debug("crash", "Will crash intentionally");
 280         new AsyncCrasher().execute();
 281         return true;
 282     }
 283     public boolean onCreateOptionsMenu(Menu menu) {
 284         // Inflate the menu; this adds items to the action bar if it is present.
 285         getMenuInflater().inflate(R.menu.new_transaction, menu);
 286
 287         if (BuildConfig.DEBUG) {
 288             menu.findItem(R.id.action_simulate_crash).setVisible(true);
 289         }
 290         check_transaction_submittable();
 291
 292         return true;
 293     }
 294
 295     public void pickTransactionDate(View view) {
 296         DialogFragment picker = new DatePickerFragment();
 297         picker.show(getSupportFragmentManager(), "datePicker");
 298     }
 299
 300     public int dp2px(float dp) {
 301         return Math.round(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp,
 302                 getResources().getDisplayMetrics()));
 303     }
 304     private void hookTextChangeListener(final TextView view) {
 305         view.addTextChangedListener(new TextWatcher() {
 306             @Override
 307             public void beforeTextChanged(CharSequence s, int start, int count, int after) {
 308
 309             }
 310
 311             @Override
 312             public void onTextChanged(CharSequence s, int start, int before, int count) {
 313
 314             }
 315
 316             @Override
 317             public void afterTextChanged(Editable s) {
 318 //                debug("input", "text changed");
 319                 check_transaction_submittable();
 320             }
 321         });
 322
 323     }
 324     private TableRow doAddAccountRow(boolean focus) {
 325         final AutoCompleteTextView acc = new AutoCompleteTextView(this);
 326         acc.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.MATCH_PARENT,
 327                 TableRow.LayoutParams.WRAP_CONTENT, 9f));
 328         acc.setHint(R.string.new_transaction_account_hint);
 329         acc.setWidth(0);
 330         acc.setImeOptions(EditorInfo.IME_ACTION_NEXT | EditorInfo.IME_FLAG_NO_ENTER_ACTION |
 331                           EditorInfo.IME_FLAG_NAVIGATE_NEXT);
 332         acc.setSingleLine(true);
 333
 334         final EditText amt = new EditText(this);
 335         amt.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT,
 336                 TableRow.LayoutParams.MATCH_PARENT, 1f));
 337         amt.setHint(R.string.new_transaction_amount_hint);
 338         amt.setWidth(0);
 339         amt.setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_SIGNED |
 340                          InputType.TYPE_NUMBER_FLAG_DECIMAL);
 341         amt.setMinWidth(dp2px(40));
 342         amt.setTextAlignment(EditText.TEXT_ALIGNMENT_VIEW_END);
 343         amt.setImeOptions(EditorInfo.IME_ACTION_DONE);
 344         amt.setSelectAllOnFocus(true);
 345
 346         // forward navigation support
 347         final TableRow last_row = (TableRow) table.getChildAt(table.getChildCount() - 1);
 348         final TextView last_amt = (TextView) last_row.getChildAt(1);
 349         last_amt.setNextFocusForwardId(acc.getId());
 350         last_amt.setNextFocusRightId(acc.getId());
 351         last_amt.setImeOptions(EditorInfo.IME_ACTION_NEXT);
 352         acc.setNextFocusForwardId(amt.getId());
 353         acc.setNextFocusRightId(amt.getId());
 354
 355         final TableRow row = new TableRow(this);
 356         row.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.MATCH_PARENT,
 357                 TableRow.LayoutParams.MATCH_PARENT));
 358         row.setGravity(Gravity.BOTTOM);
 359         row.addView(acc);
 360         row.addView(amt);
 361         table.addView(row);
 362
 363         if (focus) acc.requestFocus();
 364
 365         hookSwipeListener(row);
 366         MLDB.hookAutocompletionAdapter(this, acc, MLDB.ACCOUNTS_TABLE, "name", true, amt, null,
 367                 mProfile);
 368         hookTextChangeListener(acc);
 369         hookTextChangeListener(amt);
 370
 371         return row;
 372     }
 373     public void addTransactionAccountFromMenu(MenuItem item) {
 374         doAddAccountRow(true);
 375     }
 376     public void resetTransactionFromMenu(MenuItem item) {
 377         resetForm();
 378     }
 379     public void saveTransactionFromMenu(MenuItem item) {
 380         saveTransaction();
 381     }
 382     // rules:
 383     // 1) at least two account names
 384     // 2) each amount must have account name
 385     // 3) amounts must balance to 0, or
 386     // 3a) there must be exactly one empty amount
 387     // 4) empty accounts with empty amounts are ignored
 388     // 5) a row with an empty account name or empty amount is guaranteed to exist
 389     @SuppressLint("DefaultLocale")
 390     private void check_transaction_submittable() {
 391         TableLayout table = findViewById(R.id.new_transaction_accounts_table);
 392         int accounts = 0;
 393         int accounts_with_values = 0;
 394         int amounts = 0;
 395         int amounts_with_accounts = 0;
 396         int empty_rows = 0;
 397         TextView empty_amount = null;
 398         boolean single_empty_amount = false;
 399         boolean single_empty_amount_has_account = false;
 400         float running_total = 0f;
 401         boolean have_description =
 402                 !((TextView) findViewById(R.id.new_transaction_description)).getText().toString()
 403                         .isEmpty();
 404
 405         try {
 406             for (int i = 0; i < table.getChildCount(); i++) {
 407                 TableRow row = (TableRow) table.getChildAt(i);
 408
 409                 TextView acc_name_v = (TextView) row.getChildAt(0);
 410                 TextView amount_v = (TextView) row.getChildAt(1);
 411                 String amt = String.valueOf(amount_v.getText());
 412                 String acc_name = String.valueOf(acc_name_v.getText());
 413                 acc_name = acc_name.trim();
 414
 415                 if (!acc_name.isEmpty()) {
 416                     accounts++;
 417
 418                     if (!amt.isEmpty()) {
 419                         accounts_with_values++;
 420                     }
 421                 }
 422                 else empty_rows++;
 423
 424                 if (amt.isEmpty()) {
 425                     amount_v.setHint(String.format("%1.2f", 0f));
 426                     if (empty_amount == null) {
 427                         empty_amount = amount_v;
 428                         single_empty_amount = true;
 429                         single_empty_amount_has_account = !acc_name.isEmpty();
 430                     }
 431                     else if (!acc_name.isEmpty()) single_empty_amount = false;
 432                 }
 433                 else {
 434                     amounts++;
 435                     if (!acc_name.isEmpty()) amounts_with_accounts++;
 436                     running_total += Float.valueOf(amt);
 437                 }
 438             }
 439
 440             if ((empty_rows == 0) &&
 441                 ((table.getChildCount() == accounts) || (table.getChildCount() == amounts)))
 442             {
 443                 doAddAccountRow(false);
 444             }
 445
 446             debug("submittable", String.format("accounts=%d, accounts_with_values=%s, " +
 447                                                "amounts_with_accounts=%d, amounts=%d, running_total=%1.2f, " +
 448                                                "single_empty_with_acc=%s", accounts,
 449                     accounts_with_values, amounts_with_accounts, amounts, running_total,
 450                     (single_empty_amount && single_empty_amount_has_account) ? "true" : "false"));
 451
 452             if (have_description && (accounts >= 2) && (accounts_with_values >= (accounts - 1)) &&
 453                 (amounts_with_accounts == amounts) &&
 454                 (single_empty_amount && single_empty_amount_has_account || isZero(running_total)))
 455             {
 456                 if (fab != null) {
 457                     fab.show();
 458                     fab.setEnabled(true);
 459                 }
 460             }
 461             else {
 462                 if (fab != null) fab.hide();
 463             }
 464
 465             if (single_empty_amount) {
 466                 empty_amount.setHint(String.format("%1.2f",
 467                         (Math.abs(running_total) > 0.005) ? -running_total : 0f));
 468             }
 469
 470         }
 471         catch (NumberFormatException e) {
 472             if (fab != null) fab.hide();
 473         }
 474         catch (Exception e) {
 475             e.printStackTrace();
 476             if (fab != null) fab.hide();
 477         }
 478     }
 479
 480     @Override
 481     public void done(String error) {
 482         progress.setVisibility(View.INVISIBLE);
 483         debug("visuals", "hiding progress");
 484
 485         if (error == null) resetForm();
 486         else Snackbar.make(findViewById(R.id.new_transaction_accounts_table), error,
 487                 BaseTransientBottomBar.LENGTH_LONG).show();
 488
 489         toggleAllEditing(true);
 490         check_transaction_submittable();
 491     }
 492
 493     private void resetForm() {
 494         tvDate.setText("");
 495         tvDescription.setText("");
 496
 497         tvDescription.requestFocus();
 498
 499         while (table.getChildCount() > 2) {
 500             table.removeViewAt(2);
 501         }
 502         for (int i = 0; i < 2; i++) {
 503             TableRow tr = (TableRow) table.getChildAt(i);
 504             if (tr == null) break;
 505
 506             ((TextView) tr.getChildAt(0)).setText("");
 507             ((TextView) tr.getChildAt(1)).setText("");
 508         }
 509     }
 510     @Override
 511     public void descriptionSelected(String description) {
 512         debug("descr selected", description);
 513         if (!inputStateIsInitial()) return;
 514
 515         String accFilter = mProfile.getPreferredAccountsFilter();
 516
 517         ArrayList<String> params = new ArrayList<>();
 518         StringBuilder sb = new StringBuilder(
 519                 "select t.profile, t.id from transactions t where t.description=?");
 520         params.add(description);
 521
 522         if (accFilter != null) {
 523             sb.append(" AND EXISTS (").append("SELECT 1 FROM transaction_accounts ta ")
 524                     .append("WHERE ta.profile = t.profile").append(" AND ta.transaction_id = t.id")
 525                     .append(" AND UPPER(ta.account_name) LIKE '%'||?||'%')");
 526             params.add(accFilter.toUpperCase());
 527         }
 528
 529         sb.append(" ORDER BY date desc limit 1");
 530
 531         final String sql = sb.toString();
 532         debug("descr", sql);
 533         debug("descr", params.toString());
 534
 535         try (Cursor c = App.getDatabase().rawQuery(sql, params.toArray(new String[]{}))) {
 536             if (!c.moveToNext()) return;
 537
 538             String profileUUID = c.getString(0);
 539             int transactionId = c.getInt(1);
 540             LedgerTransaction tr;
 541             MobileLedgerProfile profile = Data.getProfile(profileUUID);
 542             if (profile == null) throw new RuntimeException(String.format(
 543                     "Unable to find profile %s, which is supposed to contain " +
 544                     "transaction %d with description %s", profileUUID, transactionId, description));
 545
 546             tr = profile.loadTransaction(transactionId);
 547             table = findViewById(R.id.new_transaction_accounts_table);
 548             ArrayList<LedgerTransactionAccount> accounts = tr.getAccounts();
 549             TableRow firstNegative = null;
 550             int negativeCount = 0;
 551             for (int i = 0; i < accounts.size(); i++) {
 552                 LedgerTransactionAccount acc = accounts.get(i);
 553                 TableRow row = (TableRow) table.getChildAt(i);
 554                 if (row == null) row = doAddAccountRow(false);
 555
 556                 ((TextView) row.getChildAt(0)).setText(acc.getAccountName());
 557                 ((TextView) row.getChildAt(1))
 558                         .setText(String.format(Locale.US, "%1.2f", acc.getAmount()));
 559
 560                 if (acc.getAmount() < 0.005) {
 561                     if (firstNegative == null) firstNegative = row;
 562                     negativeCount++;
 563                 }
 564             }
 565
 566             if (negativeCount == 1) {
 567                 ((TextView) firstNegative.getChildAt(1)).setText(null);
 568             }
 569
 570             check_transaction_submittable();
 571
 572             EditText firstAmount = (EditText) ((TableRow) table.getChildAt(0)).getChildAt(1);
 573             String amtString = String.valueOf(firstAmount.getText());
 574             firstAmount.requestFocus();
 575             firstAmount.setSelection(0, amtString.length());
 576         }
 577
 578     }
 579     private boolean inputStateIsInitial() {
 580         table = findViewById(R.id.new_transaction_accounts_table);
 581
 582         if (table.getChildCount() != 2) return false;
 583
 584         for (int i = 0; i < 2; i++) {
 585             TableRow row = (TableRow) table.getChildAt(i);
 586             if (((TextView) row.getChildAt(0)).getText().length() > 0) return false;
 587             if (((TextView) row.getChildAt(1)).getText().length() > 0) return false;
 588         }
 589
 590         return true;
 591     }
 592     private class AsyncCrasher extends AsyncTask<Void, Void, Void> {
 593         @Override
 594         protected Void doInBackground(Void... voids) {
 595             throw new RuntimeException("Simulated crash");
 596         }
 597     }
 598 }