src/com/owncloud/android/ui/activity/Uploader.java

   1 /**
   2  *   ownCloud Android client application
   3  *
   4  *   @author Bartek Przybylski
   5  *   Copyright (C) 2012  Bartek Przybylski
   6  *   Copyright (C) 2015 ownCloud Inc.
   7  *
   8  *   This program is free software: you can redistribute it and/or modify
   9  *   it under the terms of the GNU General Public License version 2,
  10  *   as published by the Free Software Foundation.
  11  *
  12  *   This program is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 package com.owncloud.android.ui.activity;
  23
  24 import java.io.File;
  25 import java.util.ArrayList;
  26 import java.util.HashMap;
  27 import java.util.LinkedList;
  28 import java.util.List;
  29 import java.util.Stack;
  30 import java.util.Vector;
  31
  32 import android.accounts.Account;
  33 import android.accounts.AccountManager;
  34 import android.app.AlertDialog;
  35 import android.app.AlertDialog.Builder;
  36 import android.app.Dialog;
  37 import android.app.ProgressDialog;
  38 import android.content.Context;
  39 import android.content.DialogInterface;
  40 import android.content.DialogInterface.OnCancelListener;
  41 import android.content.DialogInterface.OnClickListener;
  42 import android.content.Intent;
  43 import android.content.SharedPreferences;
  44 import android.content.res.Resources.NotFoundException;
  45 import android.database.Cursor;
  46 import android.net.Uri;
  47 import android.os.Bundle;
  48 import android.os.Parcelable;
  49 import android.preference.PreferenceManager;
  50 import android.provider.MediaStore.Audio;
  51 import android.provider.MediaStore.Images;
  52 import android.provider.MediaStore.Video;
  53 import android.view.View;
  54 import android.widget.AdapterView;
  55 import android.widget.AdapterView.OnItemClickListener;
  56 import android.widget.Button;
  57 import android.widget.EditText;
  58 import android.widget.ListView;
  59 import android.widget.SimpleAdapter;
  60 import android.widget.Toast;
  61
  62 import com.actionbarsherlock.app.ActionBar;
  63 import com.actionbarsherlock.view.MenuItem;
  64 import com.owncloud.android.MainApp;
  65 import com.owncloud.android.R;
  66 import com.owncloud.android.authentication.AccountAuthenticator;
  67 import com.owncloud.android.datamodel.FileDataStorageManager;
  68 import com.owncloud.android.datamodel.OCFile;
  69 import com.owncloud.android.files.services.FileUploader;
  70 import com.owncloud.android.lib.common.operations.RemoteOperation;
  71 import com.owncloud.android.lib.common.operations.RemoteOperationResult;
  72 import com.owncloud.android.lib.common.utils.Log_OC;
  73 import com.owncloud.android.operations.CreateFolderOperation;
  74 import com.owncloud.android.ui.dialog.CreateFolderDialogFragment;
  75 import com.owncloud.android.utils.DisplayUtils;
  76 import com.owncloud.android.utils.ErrorMessageAdapter;
  77
  78
  79 /**
  80  * This can be used to upload things to an ownCloud instance.
  81  */
  82 public class Uploader extends FileActivity
  83         implements OnItemClickListener, android.view.View.OnClickListener {
  84
  85     private static final String TAG = Uploader.class.getSimpleName();
  86
  87     private Account mAccount;
  88     private AccountManager mAccountManager;
  89     private Stack<String> mParents;
  90     private ArrayList<Parcelable> mStreamsToUpload;
  91     private boolean mCreateDir;
  92     private String mUploadPath;
  93     private FileDataStorageManager mStorageManager;
  94     private OCFile mFile;
  95     private boolean mAccountSelected = false;
  96
  97     private final static int DIALOG_NO_ACCOUNT = 0;
  98     private final static int DIALOG_WAITING = 1;
  99     private final static int DIALOG_NO_STREAM = 2;
 100     private final static int DIALOG_MULTIPLE_ACCOUNT = 3;
 101
 102     private final static int REQUEST_CODE_SETUP_ACCOUNT = 0;
 103
 104     private final static String KEY_PARENTS = "PARENTS";
 105     private final static String KEY_ACCOUNT = "ACCOUNT";
 106     private final static String KEY_FILE = "FILE";
 107     private final static String KEY_ACCOUNT_SELECTED = "ACCOUNT_SELECTED";
 108
 109     @Override
 110     protected void onCreate(Bundle savedInstanceState) {
 111         super.onCreate(savedInstanceState);
 112
 113         if (savedInstanceState == null) {
 114             mParents = new Stack<String>();
 115         } else {
 116             mParents = (Stack<String>) savedInstanceState.getSerializable(KEY_PARENTS);
 117             mAccount = savedInstanceState.getParcelable(KEY_ACCOUNT);
 118             mFile = savedInstanceState.getParcelable(KEY_FILE);
 119             mStorageManager = new FileDataStorageManager(mAccount, getContentResolver());
 120             mAccountSelected = savedInstanceState.getBoolean(KEY_ACCOUNT_SELECTED);
 121         }
 122
 123         ActionBar actionBar = getSupportActionBar();
 124         actionBar.setIcon(DisplayUtils.getSeasonalIconId());
 125
 126         if (prepareStreamsToUpload()) {
 127             mAccountManager = (AccountManager) getSystemService(Context.ACCOUNT_SERVICE);
 128             Account[] accounts = mAccountManager.getAccountsByType(MainApp.getAccountType());
 129             if (accounts.length == 0) {
 130                 Log_OC.i(TAG, "No ownCloud account is available");
 131                 showDialog(DIALOG_NO_ACCOUNT);
 132             } else if (accounts.length > 1 && !mAccountSelected) {
 133                 Log_OC.i(TAG, "More than one ownCloud is available");
 134                 showDialog(DIALOG_MULTIPLE_ACCOUNT);
 135             } else {
 136                 if (savedInstanceState == null) {
 137                     mAccount = accounts[0];
 138                     mStorageManager = new FileDataStorageManager(mAccount, getContentResolver());
 139                 }
 140                 initTargetFolder();
 141                 populateDirectoryList();
 142
 143             }
 144
 145         } else {
 146             showDialog(DIALOG_NO_STREAM);
 147         }
 148
 149     }
 150
 151     @Override
 152     protected void onSaveInstanceState(Bundle outState) {
 153          Log_OC.d(TAG, "onSaveInstanceState() start");
 154         super.onSaveInstanceState(outState);
 155         outState.putSerializable(KEY_PARENTS, mParents);
 156         outState.putParcelable(KEY_ACCOUNT, mAccount);
 157         outState.putParcelable(KEY_FILE, mFile);
 158         outState.putBoolean(KEY_ACCOUNT_SELECTED, mAccountSelected);
 159
 160         Log_OC.d(TAG, "onSaveInstanceState() end");
 161     }
 162
 163     @Override
 164     protected Dialog onCreateDialog(final int id) {
 165         final AlertDialog.Builder builder = new Builder(this);
 166         switch (id) {
 167         case DIALOG_WAITING:
 168             ProgressDialog pDialog = new ProgressDialog(this);
 169             pDialog.setIndeterminate(false);
 170             pDialog.setCancelable(false);
 171             pDialog.setMessage(getResources().getString(R.string.uploader_info_uploading));
 172             return pDialog;
 173         case DIALOG_NO_ACCOUNT:
 174             builder.setIcon(android.R.drawable.ic_dialog_alert);
 175             builder.setTitle(R.string.uploader_wrn_no_account_title);
 176             builder.setMessage(String.format(
 177                     getString(R.string.uploader_wrn_no_account_text), getString(R.string.app_name)));
 178             builder.setCancelable(false);
 179             builder.setPositiveButton(R.string.uploader_wrn_no_account_setup_btn_text, new OnClickListener() {
 180                 @Override
 181                 public void onClick(DialogInterface dialog, int which) {
 182                     if (android.os.Build.VERSION.SDK_INT > android.os.Build.VERSION_CODES.ECLAIR_MR1) {
 183                         // using string value since in API7 this
 184                         // constatn is not defined
 185                         // in API7 < this constatant is defined in
 186                         // Settings.ADD_ACCOUNT_SETTINGS
 187                         // and Settings.EXTRA_AUTHORITIES
 188                         Intent intent = new Intent(android.provider.Settings.ACTION_ADD_ACCOUNT);
 189                         intent.putExtra("authorities", new String[] { MainApp.getAuthTokenType() });
 190                         startActivityForResult(intent, REQUEST_CODE_SETUP_ACCOUNT);
 191                     } else {
 192                         // since in API7 there is no direct call for
 193                         // account setup, so we need to
 194                         // show our own AccountSetupAcricity, get
 195                         // desired results and setup
 196                         // everything for ourself
 197                         Intent intent = new Intent(getBaseContext(), AccountAuthenticator.class);
 198                         startActivityForResult(intent, REQUEST_CODE_SETUP_ACCOUNT);
 199                     }
 200                 }
 201             });
 202             builder.setNegativeButton(R.string.uploader_wrn_no_account_quit_btn_text, new OnClickListener() {
 203                 @Override
 204                 public void onClick(DialogInterface dialog, int which) {
 205                     finish();
 206                 }
 207             });
 208             return builder.create();
 209         case DIALOG_MULTIPLE_ACCOUNT:
 210             CharSequence ac[] = new CharSequence[
 211                     mAccountManager.getAccountsByType(MainApp.getAccountType()).length];
 212             for (int i = 0; i < ac.length; ++i) {
 213                 ac[i] = DisplayUtils.convertIdn(
 214                         mAccountManager.getAccountsByType(MainApp.getAccountType())[i].name, false);
 215             }
 216             builder.setTitle(R.string.common_choose_account);
 217             builder.setItems(ac, new OnClickListener() {
 218                 @Override
 219                 public void onClick(DialogInterface dialog, int which) {
 220                     mAccount = mAccountManager.getAccountsByType(MainApp.getAccountType())[which];
 221                     mStorageManager = new FileDataStorageManager(mAccount, getContentResolver());
 222                     initTargetFolder();
 223                     populateDirectoryList();
 224                     dialog.dismiss();
 225                     mAccountSelected = true;
 226                 }
 227             });
 228             builder.setCancelable(true);
 229             builder.setOnCancelListener(new OnCancelListener() {
 230                 @Override
 231                 public void onCancel(DialogInterface dialog) {
 232                     dialog.cancel();
 233                     finish();
 234                 }
 235             });
 236             return builder.create();
 237         case DIALOG_NO_STREAM:
 238             builder.setIcon(android.R.drawable.ic_dialog_alert);
 239             builder.setTitle(R.string.uploader_wrn_no_content_title);
 240             builder.setMessage(R.string.uploader_wrn_no_content_text);
 241             builder.setCancelable(false);
 242             builder.setNegativeButton(R.string.common_cancel, new OnClickListener() {
 243                 @Override
 244                 public void onClick(DialogInterface dialog, int which) {
 245                     finish();
 246                 }
 247             });
 248             return builder.create();
 249         default:
 250             throw new IllegalArgumentException("Unknown dialog id: " + id);
 251         }
 252     }
 253
 254     class a implements OnClickListener {
 255         String mPath;
 256         EditText mDirname;
 257
 258         public a(String path, EditText dirname) {
 259             mPath = path;
 260             mDirname = dirname;
 261         }
 262
 263         @Override
 264         public void onClick(DialogInterface dialog, int which) {
 265             Uploader.this.mUploadPath = mPath + mDirname.getText().toString();
 266             Uploader.this.mCreateDir = true;
 267             uploadFiles();
 268         }
 269     }
 270
 271     @Override
 272     public void onBackPressed() {
 273
 274         if (mParents.size() <= 1) {
 275             super.onBackPressed();
 276             return;
 277         } else {
 278             mParents.pop();
 279             populateDirectoryList();
 280         }
 281     }
 282
 283     @Override
 284     public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
 285         // click on folder in the list
 286         Log_OC.d(TAG, "on item click");
 287         Vector<OCFile> tmpfiles = mStorageManager.getFolderContent(mFile);
 288         if (tmpfiles.size() <= 0) return;
 289         // filter on dirtype
 290         Vector<OCFile> files = new Vector<OCFile>();
 291         for (OCFile f : tmpfiles)
 292             if (f.isFolder())
 293                 files.add(f);
 294         if (files.size() < position) {
 295             throw new IndexOutOfBoundsException("Incorrect item selected");
 296         }
 297         mParents.push(files.get(position).getFileName());
 298         populateDirectoryList();
 299     }
 300
 301     @Override
 302     public void onClick(View v) {
 303         // click on button
 304         switch (v.getId()) {
 305         case R.id.uploader_choose_folder:
 306             mUploadPath = "";   // first element in mParents is root dir, represented by ""; init mUploadPath with "/" results in a "//" prefix
 307             for (String p : mParents)
 308                 mUploadPath += p + OCFile.PATH_SEPARATOR;
 309             Log_OC.d(TAG, "Uploading file to dir " + mUploadPath);
 310
 311             uploadFiles();
 312
 313             break;
 314
 315         case R.id.uploader_new_folder:
 316             CreateFolderDialogFragment dialog = CreateFolderDialogFragment.newInstance(mFile);
 317             dialog.show(getSupportFragmentManager(), "createdirdialog");
 318             break;
 319
 320
 321         default:
 322             throw new IllegalArgumentException("Wrong element clicked");
 323         }
 324     }
 325
 326     @Override
 327     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
 328         super.onActivityResult(requestCode, resultCode, data);
 329         Log_OC.i(TAG, "result received. req: " + requestCode + " res: " + resultCode);
 330         if (requestCode == REQUEST_CODE_SETUP_ACCOUNT) {
 331             dismissDialog(DIALOG_NO_ACCOUNT);
 332             if (resultCode == RESULT_CANCELED) {
 333                 finish();
 334             }
 335             Account[] accounts = mAccountManager.getAccountsByType(MainApp.getAuthTokenType());
 336             if (accounts.length == 0) {
 337                 showDialog(DIALOG_NO_ACCOUNT);
 338             } else {
 339                 // there is no need for checking for is there more then one
 340                 // account at this point
 341                 // since account setup can set only one account at time
 342                 mAccount = accounts[0];
 343                 populateDirectoryList();
 344             }
 345         }
 346     }
 347
 348     private void populateDirectoryList() {
 349         setContentView(R.layout.uploader_layout);
 350
 351         ListView mListView = (ListView) findViewById(android.R.id.list);
 352
 353         String current_dir = mParents.peek();
 354         if(current_dir.equals("")){
 355             getSupportActionBar().setTitle(getString(R.string.default_display_name_for_root_folder));
 356         }
 357         else{
 358             getSupportActionBar().setTitle(current_dir);
 359         }
 360         boolean notRoot = (mParents.size() > 1);
 361         ActionBar actionBar = getSupportActionBar();
 362         actionBar.setDisplayHomeAsUpEnabled(notRoot);
 363         actionBar.setHomeButtonEnabled(notRoot);
 364
 365         String full_path = generatePath(mParents);
 366
 367         Log_OC.d(TAG, "Populating view with content of : " + full_path);
 368
 369         mFile = mStorageManager.getFileByPath(full_path);
 370         if (mFile != null) {
 371             Vector<OCFile> files = mStorageManager.getFolderContent(mFile);
 372             List<HashMap<String, Object>> data = new LinkedList<HashMap<String,Object>>();
 373             for (OCFile f : files) {
 374                 HashMap<String, Object> h = new HashMap<String, Object>();
 375                 if (f.isFolder()) {
 376                     h.put("dirname", f.getFileName());
 377                     data.add(h);
 378                 }
 379             }
 380             SimpleAdapter sa = new SimpleAdapter(this,
 381                                                 data,
 382                                                 R.layout.uploader_list_item_layout,
 383                                                 new String[] {"dirname"},
 384                                                 new int[] {R.id.textView1});
 385
 386             mListView.setAdapter(sa);
 387             Button btnChooseFolder = (Button) findViewById(R.id.uploader_choose_folder);
 388             btnChooseFolder.setOnClickListener(this);
 389
 390             Button btnNewFolder = (Button) findViewById(R.id.uploader_new_folder);
 391             btnNewFolder.setOnClickListener(this);
 392
 393             mListView.setOnItemClickListener(this);
 394         }
 395     }
 396
 397     private String generatePath(Stack<String> dirs) {
 398         String full_path = "";
 399
 400         for (String a : dirs)
 401             full_path += a + "/";
 402         return full_path;
 403     }
 404
 405     private boolean prepareStreamsToUpload() {
 406         if (getIntent().getAction().equals(Intent.ACTION_SEND)) {
 407             mStreamsToUpload = new ArrayList<Parcelable>();
 408             mStreamsToUpload.add(getIntent().getParcelableExtra(Intent.EXTRA_STREAM));
 409         } else if (getIntent().getAction().equals(Intent.ACTION_SEND_MULTIPLE)) {
 410             mStreamsToUpload = getIntent().getParcelableArrayListExtra(Intent.EXTRA_STREAM);
 411         }
 412         return (mStreamsToUpload != null && mStreamsToUpload.get(0) != null);
 413     }
 414
 415     public void uploadFiles() {
 416         try {
 417
 418             ArrayList<String> local = new ArrayList<String>();
 419             ArrayList<String> remote = new ArrayList<String>();
 420
 421             // this checks the mimeType
 422             for (Parcelable mStream : mStreamsToUpload) {
 423
 424                 Uri uri = (Uri) mStream;
 425                 if (uri !=null) {
 426                     if (uri.getScheme().equals("content")) {
 427
 428                        String mimeType = getContentResolver().getType(uri);
 429
 430                        if (mimeType.contains("image")) {
 431                            String[] CONTENT_PROJECTION = { Images.Media.DATA,
 432                                    Images.Media.DISPLAY_NAME, Images.Media.MIME_TYPE,
 433                                    Images.Media.SIZE};
 434                            Cursor c = getContentResolver().query(uri, CONTENT_PROJECTION, null,
 435                                    null, null);
 436                            c.moveToFirst();
 437                            int index = c.getColumnIndex(Images.Media.DATA);
 438                            String data = c.getString(index);
 439                            local.add(data);
 440                            remote.add(mUploadPath +
 441                                    c.getString(c.getColumnIndex(Images.Media.DISPLAY_NAME)));
 442
 443                        }
 444                        else if (mimeType.contains("video")) {
 445                            String[] CONTENT_PROJECTION = { Video.Media.DATA,
 446                                    Video.Media.DISPLAY_NAME, Video.Media.MIME_TYPE,
 447                                    Video.Media.SIZE, Video.Media.DATE_MODIFIED };
 448                            Cursor c = getContentResolver().query(uri, CONTENT_PROJECTION, null,
 449                                    null, null);
 450                            c.moveToFirst();
 451                            int index = c.getColumnIndex(Video.Media.DATA);
 452                            String data = c.getString(index);
 453                            local.add(data);
 454                            remote.add(mUploadPath +
 455                                    c.getString(c.getColumnIndex(Video.Media.DISPLAY_NAME)));
 456
 457                        }
 458                        else if (mimeType.contains("audio")) {
 459                            String[] CONTENT_PROJECTION = { Audio.Media.DATA,
 460                                    Audio.Media.DISPLAY_NAME, Audio.Media.MIME_TYPE,
 461                                    Audio.Media.SIZE };
 462                            Cursor c = getContentResolver().query(uri, CONTENT_PROJECTION, null,
 463                                    null, null);
 464                            c.moveToFirst();
 465                            int index = c.getColumnIndex(Audio.Media.DATA);
 466                            String data = c.getString(index);
 467                            local.add(data);
 468                            remote.add(mUploadPath +
 469                                    c.getString(c.getColumnIndex(Audio.Media.DISPLAY_NAME)));
 470
 471                        }
 472                        else {
 473                            String filePath = Uri.decode(uri.toString()).replace(uri.getScheme() +
 474                                    "://", "");
 475                            // cut everything whats before mnt. It occurred to me that sometimes
 476                            // apps send their name into the URI
 477                            if (filePath.contains("mnt")) {
 478                               String splitedFilePath[] = filePath.split("/mnt");
 479                               filePath = splitedFilePath[1];
 480                            }
 481                            final File file = new File(filePath);
 482                            local.add(file.getAbsolutePath());
 483                            remote.add(mUploadPath + file.getName());
 484                        }
 485
 486                     } else if (uri.getScheme().equals("file")) {
 487                         String filePath = Uri.decode(uri.toString()).replace(uri.getScheme() +
 488                                 "://", "");
 489                         if (filePath.contains("mnt")) {
 490                            String splitedFilePath[] = filePath.split("/mnt");
 491                            filePath = splitedFilePath[1];
 492                         }
 493                         final File file = new File(filePath);
 494                         local.add(file.getAbsolutePath());
 495                         remote.add(mUploadPath + file.getName());
 496                     }
 497                     else {
 498                         throw new SecurityException();
 499                     }
 500                 }
 501                 else {
 502                     throw new SecurityException();
 503                 }
 504
 505             Intent intent = new Intent(getApplicationContext(), FileUploader.class);
 506             intent.putExtra(FileUploader.KEY_UPLOAD_TYPE, FileUploader.UPLOAD_MULTIPLE_FILES);
 507             intent.putExtra(FileUploader.KEY_LOCAL_FILE, local.toArray(new String[local.size()]));
 508             intent.putExtra(FileUploader.KEY_REMOTE_FILE,
 509                     remote.toArray(new String[remote.size()]));
 510             intent.putExtra(FileUploader.KEY_ACCOUNT, mAccount);
 511             startService(intent);
 512
 513             //Save the path to shared preferences
 514             SharedPreferences.Editor appPrefs = PreferenceManager
 515                     .getDefaultSharedPreferences(getApplicationContext()).edit();
 516             appPrefs.putString("last_upload_path", mUploadPath);
 517             appPrefs.apply();
 518
 519             finish();
 520             }
 521
 522         } catch (SecurityException e) {
 523             String message = String.format(getString(R.string.uploader_error_forbidden_content),
 524                     getString(R.string.app_name));
 525             Toast.makeText(this, message, Toast.LENGTH_LONG).show();
 526         }
 527     }
 528
 529     @Override
 530     public void onRemoteOperationFinish(RemoteOperation operation, RemoteOperationResult result) {
 531         super.onRemoteOperationFinish(operation, result);
 532
 533
 534         if (operation instanceof CreateFolderOperation) {
 535             onCreateFolderOperationFinish((CreateFolderOperation)operation, result);
 536         }
 537
 538     }
 539
 540     /**
 541      * Updates the view associated to the activity after the finish of an operation
 542      * trying create a new folder
 543      *
 544      * @param operation     Creation operation performed.
 545      * @param result        Result of the creation.
 546      */
 547     private void onCreateFolderOperationFinish(CreateFolderOperation operation,
 548                                                RemoteOperationResult result) {
 549         if (result.isSuccess()) {
 550             dismissLoadingDialog();
 551             populateDirectoryList();
 552         } else {
 553             dismissLoadingDialog();
 554             try {
 555                 Toast msg = Toast.makeText(this,
 556                         ErrorMessageAdapter.getErrorCauseMessage(result, operation, getResources()),
 557                         Toast.LENGTH_LONG);
 558                 msg.show();
 559
 560             } catch (NotFoundException e) {
 561                 Log_OC.e(TAG, "Error while trying to show fail message " , e);
 562             }
 563         }
 564     }
 565
 566
 567     /**
 568      *  Loads the target folder initialize shown to the user.
 569      *
 570      *  The target account has to be chosen before this method is called.
 571      */
 572     private void initTargetFolder() {
 573         if (mStorageManager == null) {
 574             throw new IllegalStateException("Do not call this method before " +
 575                     "initializing mStorageManager");
 576         }
 577
 578         SharedPreferences appPreferences = PreferenceManager
 579                 .getDefaultSharedPreferences(getApplicationContext());
 580
 581         String last_path = appPreferences.getString("last_upload_path", "");
 582         // "/" equals root-directory
 583         if(last_path.equals("/")) {
 584             mParents.add("");
 585         }
 586         else{
 587             String[] dir_names = last_path.split("/");
 588             for (String dir : dir_names)
 589                 mParents.add(dir);
 590         }
 591         //Make sure that path still exists, if it doesn't pop the stack and try the previous path
 592             while(!mStorageManager.fileExists(generatePath(mParents)) && mParents.size() > 1){
 593                 mParents.pop();
 594             }
 595     }
 596
 597
 598     @Override
 599     public boolean onOptionsItemSelected(MenuItem item) {
 600         boolean retval = true;
 601         switch (item.getItemId()) {
 602         case android.R.id.home: {
 603             if((mParents.size() > 1)) {
 604                 onBackPressed();
 605             }
 606             break;
 607         }
 608         default:
 609             retval = super.onOptionsItemSelected(item);
 610         }
 611         return retval;
 612     }
 613
 614
 615 }